Flow Orientation Research Articles

Column Experiment of a Single-Stage Multi-Soil-Layering System with Horizontal Flow

A multi-soil-layering system (MSL) is a biphasic soil-based wastewater treatment technology. In this study, two MSL columns with different soil mixture block (SMB) thicknesses were fed synthetic wastewater and monitored (i.e., organic matter and nutrients) to investigate the treatment performance of MSLs with horizontal flow (HF) orientation. The average removal efficiencies for System 1 (small SMBs) were 54%, 69%, 79%, 99%, and 95% for COD, TP, TN, NH3-N, and NO3--N, respectively, and 45%, 80%, 75%, 98%, and 85% for System 2 (large SMBs). The results suggest the primary function of SMBs in HF-MSLs is to provide phosphorous treatment. For nitrogen, unlike what has been found in other vertical flow (VF) MSL studies, denitrification was not a limiting factor. It is hypothesized (a) nitrification was facilitated by the permeable layer (PL, zeolite) and (b) the saturated conditions inherent to HF-MSLs promoted the growth of a heterogenous PL biofilm, proliferating denitrifying microorganisms. Based on the literature, it is theorized that organic matter (COD) removal was likely inhibited by the combination of competing bacterial species, insufficient aeration, a high influ-ent C/N ratio (12:1), and a relatively low HRT (~ 3 hrs). Overall, the bench scale removal efficiency results produced show the HF-MSL systems tested perform comparatively with VF-MSLs in addition to providing complete nitrogen removal. The findings from this intro-ductory investigation suggest HF-MSLs warrant further study. More research is needed (e.g., biological assessment) to validate the inter-pretations presented herein.

A Comprehensive Review of Mixed Convective Heat Transfer in Tubes and Ducts: Effects of Prandtl Number, Geometry, and Orientation

This paper presents a comprehensive review of mixed convective heat transfer phenomena involving fluids with varying Prandtl numbers, specifically focusing on their behavior in different geometries and orientations. This study systematically explores heat transfer characteristics for fluids with low, medium, and high Prandtl numbers across a range of tube geometries, including circular, rectangular, triangular, and elliptical cross-sections, and examines their effects in both horizontal and vertical tube orientations. By consolidating existing research findings and analyzing various experimental and numerical studies, this review elucidates the complex interactions between fluid properties, tube geometry, and flow orientation that influence mixed convection heat transfer. Key insights are provided into the mechanisms driving heat transfer enhancements or degradations in different scenarios. In view of the findings from this paper, more than 84% of studies were conducted in a horizontal orientation and circular cross-section with a tendency to use medium-to-high Prandtl numbers as the working fluid for the past 10 years. This paper also identifies critical gaps in current knowledge and suggests future research directions to advance the understanding and application of mixed convective heat transfer in diverse engineering systems. Furthermore, apart from having different geometries applied in industrial applications, there is still room for improvement through the addition of passive methods to the heat transfer system, including helical coils, corrugations, swirl generators, and ribs. Overall, from the literature review, it is found that there are few relevant numerical simulations and experimental studies concentrating on middle Prandtl number fluids. Hence, it is recommended to perform more research on medium Prandtl number fluids that can be used as energy storage systems (ESS) in concentrating solar power plants, nuclear reactors, and geothermal systems.

Differential tectonic activity along the southern boundary of the Qilian Mountains: Insights from low-temperature thermochronology, seismic data, and fluvial geomorphology

The Cenozoic development of the Tibetan Plateau is one of the most remarkable events in the geosciences. The southern boundary of the Qilian Mountains is a spectacular basin-mountain boundary in the northern Tibetan Plateau offering a valuable opportunity to investigate the growth processes and mechanisms of the Tibetan Plateau. Structural activity is significantly variable across the northern Qaidam basin, and the underlying reason for these differences remains uncertain. To address this issue, we undertook an analysis of two main watersheds—the Tataleng and Yuqia River watersheds—encompassing the middle section of the northern Qaidam basin. This study utilized a multidisciplinary approach combining fluvial geomorphology, low-temperature thermochronology, and seismic data to comprehensively investigate the structural activity within the northern Qaidam basin. The high channel steepness index, young low-temperature thermochronologic ages, concentrated earthquakes, and numerous knickpoints along the piedmont area of the Qaidam Shan collectively suggest that this region is among the most structurally active areas along the southern boundary of the Qilian Mountains. The varying levels of structural activity in the northern Qaidam basin could be linked to the intense glacial erosion in the Qaidam Shan during the Quaternary. Moreover, the flow orientation observed in the bedrock mountains is consistent with the N-S compressional stress field in the northern Qaidam basin during the early Cenozoic, representing a stark contrast to the modern NE-SW stress field. In this way, this research supports the understanding that river geomorphic parameters, including river steepness index and flow direction, are valuable tools for unveiling the regional tectonic evolution in bedrock mountain areas.

Effects of Gravity on Water Transport in PEM Fuel Cells Via Synchrotron X-Ray Radiography

To mitigate the effects of anthropogenic climate change caused primarily by CO2 emissions, sustainable energy technologies must be advanced to eliminate our reliance on CO2-emitting energy sources. Polymer electrolyte membrane (PEM) fuel cells are a promising technology for producing power without carbon emissions and with high efficiencies and scalability [1]. However, the commercial adaptation of PEM fuel cells has been sluggish due to high material costs [2]and inefficiencies caused by liquid water accumulation [2,3]. While major improvements have been made to PEM fuel cell components to improve water management, recent studies have shown that macroscopic changes such as cell orientation and flow direction can have profound effects on fuel cell performance and two-phase flow [3-5].In this study, to determine the optimal orientation for industrial applications of fuel cells and provide insights on water accumulation as a result of external body forces, we performed operando synchrotron X-ray radiography while varying orientation and reactant flow direction of a PEM fuel cell (Fig. 1a). We observed lower water content in the anode GDL when the flow of reactants was gravity-assisted (45º and 90º), and significantly more water content was observed when reactant flow opposed the force of gravity (315º and 270º). Furthermore, placing the cathode on top (180º) resulted in dramatic increases in anode GDL water accumulation compared to placing the cathode on the bottom (0º). Similar trends in cathode GDL water accumulation were observed but were less pronounced compared to the anode GDL. Electrochemical impedance spectroscopy and analytical modelling revealed that mass transport resistances are strongly correlated to water accumulation in the cathode GDL and especially the anode GDL. Our findings suggest that gravity and flow orientation significantly affect two-phase transport and therefore long-term performance in PEM fuel cells (Fig. 1c).

Influence of inclined magnetic field on mixed convective cross flow across a cylinder with uniform heat flux condition

This numerical study delves into the interplay between inclined magnetohydrodynamic flow and mixed convective heat transfer in a cylindrical geometry under uniform heat flux condition. The study employs a quasi-static model, where the fluid is flowing in a cross-stream regime, satisfies the Boussinesq approximation. A higher-order finite difference scheme is adopted to discretize the non-linear Navier–Stokes and energy equations, followed by a stable pseudo-time iterative technique. This study reveals that a lower Richardson number and interaction parameter are sufficient to induce vortex shedding under positive magnetic angles that can not be achieved in case of aligned magnetic field. Increasing the strength of magnetic field tends to restore the symmetric flow structure from the buoyancy-driven asymmetric one, contingent upon the magnetohydrodynamic flow orientations. The coefficients of viscous and pressure drag, average Nusselt number become non-monotonic for the aligned magnetic field, whereas it becomes strictly monotonic for other positive magnetic inclination angles at each Richardson number. Interestingly, increasing magnetic inclination angle allows to augment the total drag coefficient and overall heat transfer drastically. Critical interaction parameter is determined for average Nusselt number at various Richardson and Reynolds numbers under aligned magnetic field. The heat transfer is significantly more enhanced under uniform heat flux condition compared to constant wall temperature condition. The enhanced heat transfer achieved through magnetic field integration and modified thermal conditions has significant potential for applications such as electronic cooling, solar collectors, material processing, and more.

Numerical Prediction of Two-Dimensional Coupled Galloping and Vortex-Induced Vibration of Square Cylinders Under Symmetric/Asymmetric Flow Orientations

This study presents an advanced numerical model for predicting a two-dimensional coupled galloping and vortex-induced vibration (VIV) in cross-flow and in-line directions of square cylinders under symmetric and asymmetric flow orientations. The present model combines the quasi-steady theory for the galloping with the nonlinear structure-wake oscillators simulating VIV, capturing the time-varying drag and lift hydrodynamic forces with the time-averaged and fluctuating components. By placing a flexibly mounted square cylinder in uniform flow at an initial angle of incidence, the cylinder is subject to instantaneous changes in the dynamic angle of attack accounting for relative flow-structure velocities. Modelling of such features in cross-flow and in-line directions for low and high mass ratio systems extends previous studies which have mostly focused on cross-flow responses of square cylinders with high mass ratios at a zero angle of incidence. New sets of empirical coefficients governing the drag and lift fluid forces for both the quasi-steady and wake oscillator approaches are introduced by calibrating with available experimental data in the literature, applicable to predict several flow-induced vibration phenomena under arbitrary flow-structure orientations. Mathematical criteria for the onset of two- and one-dimensional galloping instability are presented, verifying the likelihood of galloping occurrence. Parametric investigations are carried out to highlight the important effects of flow incidence angle, mass-damping ratio (Scruton number) and in-line response on the prediction of galloping and VIV in comparison with experimental results. By varying the reduced velocity parameter, the present model captures key qualitative features of the dominant galloping, interfering galloping-VIV and dominant VIV through the response amplitudes, mean drift displacements, oscillation frequencies, fluid force components and motion trajectories. Contributions from in-line responses are found to be meaningful for the interfering galloping-VIV system with a low mass-damping ratio and for an asymmetric flow orientation. The present model could be further calibrated and applied to other fluid-structure interaction applications with non-circular cross-sectional geometries under omnidirectional flow directions.

Time-domain state-space model formulation of motion-induced aerodynamic forces on bridge decks

Motion-induced aerodynamic forces play a fundamental role in the stability and buffeting analysis of long-span bridges, which are traditionally performed in the frequency domain adopting the well-known approach based on flutter derivatives and aerodynamic admittance functions. However, the increase in span of newly designed bridges currently raises concerns regarding the role of nonlinear aerodynamic effects, the response to non-stationary winds and the aerodynamic coupling in multi-modal vibrations. Addressing these issues requires to calculate aerodynamic forces induced by arbitrary motions and, possibly, consider large variations in the incoming flow orientation, a task better suited for time-domain approaches. In this study, we introduce a time-domain state-space model formulation for motion-induced aerodynamic forces, which systematizes and generalizes previous models, while keeping a simple structure and ease of calibration. We tailor the model formulation to allow for a clear distinction between quasi-static and purely transient aerodynamic contributions and investigate the relations between the proposed model and other available models, highlighting their common underlying framework. The model is finally calibrated for a selection of bridge decks, showing a very good ability to reproduce motion-induced aerodynamic forces.

Evaluation of resin flow and fiber orientation around injection nozzle in injection molding by particle method

Evaluation of resin flow and fiber orientation around injection nozzle in injection molding by particle method

Full‐field effect of flow‐induced fiber orientation during compression molding of carbon fiber sheet molding compounds

AbstractAn image‐based fiber orientation analysis technique has been employed to study the effect of initial charge coverage and preferential fiber alignment on the flow‐induced fiber orientations in carbon fiber sheet molding compounds (SMCs). The initial charge coverage area exhibited minimal fiber reorientation while significant fiber alignment in the flow direction was observed in the regions of greatest flow. Novel subsurface analysis using the same full‐field orientation analysis technique also showed the presence of a skin‐core structure with greater flow‐induced fiber alignment at the mold surfaces, while the core retained more of the initial fiber orientation distribution. Edge effects were also revealed by this analysis at the mold walls. Tensile testing from two orthogonal directions showed that panels molded from lower charge coverage resulted in better mechanical performance and lower anisotropy. Moreover, by encouraging charge flow in the preform's preferential alignment direction, high tensile stiffness and strength in the preferred direction were achieved (56.7 GPa and 238.9 MPa, respectively) at 30% fiber volume fraction. This provides a practical demonstration of the value in controlling fiber orientation, with respect to charge positioning and mold flow, to maximize and tailor the composite performance of SMCs typically used for automotive applications.Highlights Low‐cost scanning technique is extended to assess internal fiber orientations Full‐field orientations are measured before and after molding Investigation of how charge size and shape can affect orientations Combining effects of flow and initial orientation to tailor SMC performance Circular statistics provides a thorough analysis of orientation distributions

Dynamic Metabolic Bottlenecks of a Geobacter Sulfurreducens Bioelectrochemical System Studied Using Microfluidics and the Arrhenius Equation

AbstractTo target development of bioelectrochemical systems, we developed an advanced microfluidic method to identify reaction bottlenecks in the metabolic activity of a pure‐culture Geobacter sulfurreducens electroactive biofilm (EAB). The microfluidic system was devised to include perpendicular flow orientation for improved boundary layer uniformity and was combined with an embedded 3‐electrode system to accurately apply a constant potential during the entire experimental duration which lasted se. A 3‐sensor temperature control system provided the basis of accurate temperature pulsing, which modified the EAB metabolic activity over short time intervals relative to the bacterial doubling rate. The system, together with the unique ability to control hydrodynamic, electrochemical, and thermal conditions, was used as the basis for an Arrhenius approach to obtain activation energy barrier values at different growth times, acetate concentrations, and flow rates. The results indicated that bottlenecks in the overall metabolic activity after 1 month of growth time were related to electron transfer through extracellular cytochrome c. After the EAB further matured to 4 months old, the bottleneck appeared to switch to enzyme‐driven acetate oxidation. Based on this hypothesis, we observed after 4‐months, that strong increases in effective enzyme concentration were primarily obtained by increasing flow rate, and secondarily by increasing acetate concentration

Temporal characteristics of turbulent flow and moth orientation behaviour patterns with fluent simulation and moth-based moving model simulation

ObjectivePrevious research has explored the pheromone release patterns of female moths, revealing species-specific release frequencies and the transmission of temporal information through odourant plumes in turbulent flows. Varying the release frequency during the orientation process results in distinct orientation behaviours. Studies on moth movement patterns have determined that encounters and deviations from odour plumes elicit distinct reactions; the time interval between each movement pattern is measured as the “reaction time,” and the interval between each detection and loss of odourant plume is measured as the “gap length.” MethodsWe simulated turbulent flow at various release frequencies. Our efforts focused on establishing a model that could simulate the joint orientation movement under turbulent flow and intermittent plumes. We built an agent moving mechanism, including wind velocity information, with particular reference to the temporal parameter and orientation success efficiency. ResultsWe calculated the time threshold of each burst in different simulations under different wind velocities and release frequencies. The time structure characteristics of the plume along the turbulent flow vary depending on the distance from the source. We simulated walking agents in a turbulent environment and recorded their behaviour processes. The reaction time, release interval, and time threshold were related to the orientation results. ConclusionOn the basis of previous experimental results and our simulations, we conclude that the designated interval time likely enhances search efficiency. The complex and dynamic natural environment presents various opportunities for using this unique odour-source searching capability in different scenarios, potentially improving the control systems of odour-searching robots.

Experimental study on local scour for large-diameter mono-column composite bucket foundation for offshore wind turbines

The issue of seabed scour around offshore wind turbine foundations is a significant safety concern. In this study, local scour around a specific type of foundation, known as the large-diameter Mono-Column Composite Bucket Foundation (MCCBF) with six connectors, has been investigated through physical experiments. The study involved various flow conditions, including unidirectional flows, tidal flows, and combinations of regular waves and currents. It has been found that under similar flow intensity and orientation angles, unidirectional flow tends to cause deeper scour depths, but with a more limited extent compared to scour induced by tidal flows. The disparity in maximum scour depth between tidal and unidirectional flows decreases as flow velocity increases. Under regular wave-current interaction, both the scour depth and the scour extent are larger than those induced by unidirectional flow. The presence of lee-wake vortices and streamline contractions near the connectors results in larger scour depths on either side of the foundation, especially when the orientation angle is set to 0°. Different methods for predicting scour depth of the MCCBF were applied and discussed.

Flow boiling characteristics of HFE-7000 in high aspect ratio microchannels with the effect of flow orientation

The aim of the present experimental study is to investigate the flow boiling characteristics in a high aspect ratio microchannel for two different channel orientations. Hydrofluoroether 7000 (HFE-7000) flowing within a rectangular glass microchannel (with a hydraulic diameter of 909 μm and a width-to-height aspect ratio of 10) coated with a tantalum layer to provide uniform heating along the channel was the configuration investigated. The data were recorded for mass flux of 14 − 42 kg m−2 s−1, while the heat flux was varied between 3.5 and 24.3kWm−2 under horizontal and vertical upward flow. Analysis of the experimental data reveals that thermal performance is influenced by both mass and heat fluxes, as well as flow orientation, and these are presented and discussed. The wall temperature mapping and heat transfer coefficient analysis showed that for low mass flow cases, the dry out occurs at a lower heat flux and for either flow orientation. At medium and higher heat fluxes, though, it is found that a horizontal flow produces dry out events more easily compared to vertical upward flow. The observed phenomenon during flow boiling also shows the importance of nucleate boiling and thin film evaporation on the heat transfer performance. In addition, pressure fluctuations during flow boiling were also recorded. A Fourier transform analysis of pressure fluctuations data showed that vertical upward flow produces a higher dominant frequency than horizontal flow. Finally, the analysis of thermal characteristics and pressure fluctuations can provide further insights into the design of devices where flow orientation plays a major role.

Performance of a Simplified Computational Fluid Dynamics Model for a Phase Change Material–Water Finned Heat Exchanger Under Different Orientations

ABSTRACTThe prevalent numerical models for simulating axially finned heat exchangers with phase change materials (PCMs) and water as the heat transfer fluid rely on computational fluid dynamics (CFD) techniques, with a primary focus on phase change modeling. However, the computational demands of these models, incorporating phase change effects and resolving PCM movement in the liquid state, are substantial. From experiments suggesting that conduction in the solidified PCM around the finned tube dominates heat transfer during the heat discharge process, this article introduces a simplified CFD‐based model in which convective flow of the PCM is neglected. The model is experimentally validated using a 1‐m‐long axially finned heat exchanger prototype with four fins, recording temperatures under different water flow rates and orientations (horizontal and vertical). Results show that the proposed model predicts outlet water temperature satisfactorily, with absolute errors below 1.0°C and 2.2°C for the horizontal and vertical orientations, respectively. Additionally, the model can capture the temperature trend inside the PCM for the horizontal orientation.

Effect of bend orientation on the heat transfer performance of U-bend vapor generator in transcritical ORC

Adequate recognition of supercritical heat transfer characteristics in U-bends is important to guide the optimization of the design and practical application of heat exchanges containing U-bends. Past studies have focused on the heat transfer performance under different operating conditions and geometric parameters, however, the influence of bend orientation on the local heat transfer and overall performance of U-bends is still unclear and rarely reported. This work fills this gap with numerical simulation to quantitatively analyze and explain the heat transfer performance of U-bend vapor generators with three different bend orientations (horizontal, horizontally downward, and horizontally upward). The results show that as the ratio of heat flux to mass flux increases, bend orientation effects start to appear only when the buoyancy parameter Grq/Grth at the bend inlet is above 80 ∼ 95. In all three orientations, horizontally downward flow U-bend has the best average heat transfer performance within the bend, followed by horizontal and horizontal upwardly. However, there is no significant difference in the average performance of the three orientations over the entire bend-affecting region, with a maximum difference of only 5%. Therefore, when the downstream length is much greater than the bend, there is no need to consider the influence of flow orientation. Increasing the bend curvature considerably improves the heat transfer within the bend, and the downstream bend-affecting distance becomes larger as well. However, larger curvature also causes greater fluctuation in the heat transfer coefficient. Finally, heat transfer correlations were recommended and developed for all three orientations. Correlations predict over 93% of the entire dataset with a maximum error of 20%.

The effect of rotationality on nonlinear shear flow of polymer melts and solutions

By considering the rotationality of shear flow, we distinguish between tube segments created by reptation before the inception of shear flow and those created during flow. Tube segments created before inception of shear flow experience both stretch and orientation, while tube segments created after inception of flow are not stretched, but are only aligned in the flow direction. Based on this idea, the Rotation Zero Stretch (RZS) model allows for a quantitative description of the start-up of shear flow and stress relaxation after step-shear strain experiments, in agreement with data of polystyrene long/short blends and corresponding polystyrene 3-arm star polymers investigated by Liu et al. (Polymer 2023, 281:126125), as well as the shear viscosity data of poly(propylene carbonate) melts reported by Yang et al. (Nihon Reoroji Gakkaishi 2022, 50:127–135). In the limit of steady-state shear flow, the RZS model converges to the Doi-Edwards IA model, which quantitatively describes the steady-state shear viscosity of linear polymer melts and long/short blends. The assumption of “non-stretching” of tube segments created during rotational flow is therefore in agreement with the available experimental evidence. Three-arm star polymers behave in a similar way as corresponding blends of long and short polymers confirming the solution effect of the short arm in asymmetric stars. The analysis of step-shear strain experiments reveals that stress relaxation is at first dominated by stretch relaxation, followed at times larger than the Rouse stretch relaxation time by relaxation of orientation as described by the damping function of the Doi-Edwards IA model. The RZS model does not require any nonlinear-viscoelastic parameter, but relies solely on the linear-viscoelastic relaxation modulus and the Rouse stretch relaxation time.Graphical

Magnetic field dragging in filamentary molecular clouds

Context. Maps of polarized dust emission of molecular clouds reveal the morphology of the magnetic field associated with star-forming regions. In particular, polarization maps of hub-filament systems show the distortion of magnetic field lines induced by gas flows onto and inside filaments. Aims. We aim to understand the relation between the curvature of magnetic field lines associated with filaments in hub-filament systems and the properties of the underlying gas flows. Methods. We consider steady-state models of gas with finite electrical resistivity flowing across a transverse magnetic field. We derive the relation between the bending of the field lines and the flow parameters represented by the Alfvén Mach number and the magnetic Reynolds number. Results. We find that, on the scale of the filaments, the relevant parameter for a gas of finite electrical resistivity is the magnetic Reynolds number, and we derive the relation between the deflection angle of the field from the initial direction (assumed perpendicular to the filament) and the value of the electrical resistivity, due to either Ohmic dissipation or ambipolar diffusion. Conclusions. Application of this model to specific observations of polarized dust emission in filamentary clouds shows that magnetic Reynolds numbers of a few tens are required to reproduce the data. Despite significant uncertainties in the observations (the flow speed, the geometry and orientation of the filament), and the idealization of the model, the specific cases considered show that ambipolar diffusion can provide the resistivity needed to maintain a steady state flow across magnetic fields of significant strength over realistic time scales.

Effect of flow orientation in experimental studies on FC-770 boiling heat transfer in asymmetrically heated minichannels

Effect of flow orientation in experimental studies on FC-770 boiling heat transfer in asymmetrically heated minichannels

Applicability of Intentional Topographic Revascularization Following the Angiosome Model in Patients with Chronic Limb-Threatening Ischemia: From Theory, to Current Clinical Challenges

Since its first description almost four decades ago in the plastic surgery field, the angiosome theory has shown encouraging clinical success in Chronic Limb-Threatening Ischemia (CLTI) revascularization in recent years. Gradual scientific knowledge and evidence-based feedback are necessary to assess its usefulness and to overcome various challenges lingering in its practical application at the patient’s bedside. Despite the increasing number of publications in recent years indicating its acceptable suitability in clinical practice, only a few provide conspicuous information regarding the applicability of angiosome-guided Direct Revascularization (DR) compared with the analysis of hurdles in the vascular approach, regardless of its clinical results. The current review aimed to provide an updated interpretation of DR applicability rates in daily practice, delineated through tangible assessments of feasibility, clinical match, and technical success (as previously mentioned). This analysis considered the applicability of DR, Indirect Revascularization via collaterals, (IRc), and “Wound-Targeted Revascularization” (WTR) within the broader perspective of “Intentional Topographic Revascularization” (ITR) in patients with CLTI foot. ITR affords a novel conceptualization of regional foot reperfusion via deliberate anatomical and functional orientation of the foot arterial flow to the ischemic zones (owing specific pedal arteries and regional collaterals). The analysis of data revealed significant differences in the current clinical definitions, interpretation, and application methods of TR. Inconsistent views on DR were also observed in the context of “wound-dependent” localization and the identification of the most suitable target foot artery for treatment. Unfortunately, a standardized definition of angiosome-oriented DR, IR, IRc, and WTR has not been established. Owing to the lack of a universally accepted definition and unified anatomical and functional foot arterial occlusive disease stratification, evidence supporting the applicability of ITR (by all its variants) is still awaited.

Intelligent Adaptation Mechanism of Full-Order Luenberger Observer based on Fuzzy Logic Applied to Direct Control by Flux Orientation without Speed Sensor for Doubly Fed Induction Motor

The present work focused on the control by flow orientation without mechanical sensors on the doubly fed induction motor by the use of artificial intelligence techniques. Our main contribution lies in the development of control methodologies to improve control by flux orientation, for this, we acted on the type and control of inverters by the use of multilevel inverters and then on the observation technique of rotor speed based on the high gain Luenberger observer and improvements to the speed adaptation mechanism using fuzzy logic. Simulation tests of the proposed improvement approach were carried out at the end of this work to verify the behavior of this system in the face of different types of training.