Impeller Type Research Articles

Characterisation of oscillations in multi-phase unbaffled mixing vessels

Unbaffled mixing systems have several benefits over conventional baffled systems, including significantly lower power required for solids suspension. However, one drawback of unbaffled systems is the possibility of oscillations occurring within the tank. Experimental laboratory-scale experiments have revealed oscillations in settling solids and large variations in the input power, despite the impeller speed remaining constant. These oscillations have been found to be linked through having the same frequency. The frequency and amplitude of these oscillations has been determined across a range of agitator and tank configurations, including variations in impeller size and type, impeller clearance and submerged depth, and the surface boundary conditions. The effect of solids concentration has also been investigated. The oscillations were found to be inherently multi-phase and had a strong concentration dependence. Impeller size and type influenced the amplitude and frequency of the oscillations, as did the impeller clearance. Liquid surface condition did not influence the oscillations. The oscillation frequency appears to be related to the circulation time in the tank. Although these oscillations fall into the definition of previously observed macro-instabilities, several distinguishing features are noted.

Development of a scale-up strategy for an aerated coaxial mixer containing a non-Newtonian fluid: A mass transfer approach

Coaxial mixers have been shown to be effective in enhancing the hydrodynamic stress and shear environment inside the aerated systems. However, the scale-up study of the aerated coaxial mixing reactors based on a constant mass transfer coefficient has never been reported in the literature. In this study, for the first time, a practical technique is suggested to evaluate the scalability of these systems in terms of a constant mass transfer coefficient. The effects of impeller speed, impeller type, aeration rate, and pumping direction on the mass transfer, power consumption, gas holdup profile, fluid hydrodynamics, and energy dissipation rate were explored for gas dispersion in non-Newtonian fluids inside coaxial mixers through tomography, dynamic gassing-in, and computational fluid dynamics. It was found that a practical approach to preserve the mass transfer coefficient of the large-scale coaxial mixer the same as its small-scale counterpart was to maintain the volumetric aeration rate per working fluid volume constant.

Investigation of the flow patterns and mixing efficiency in a stirred tank through particle image velocimetry

BackgroundFluid mixing is a complex process that can be significantly influenced by the impeller type and its geometry. Therefore, the selection of an appropriate impeller for effective mixing is crucial. MethodsA stirred tank setup incorporating various combinations of a lab-manufactured propulsion impeller, propeller boss cap fin (PBCF), and bottom impeller was proposed and experimentally investigated using particle image velocimetry (PIV). Significant findingsThe installation of the PBCF onto the propulsion impeller led to an increase in the radial velocity component and shear rate, along with an enhancement in the flow circulation. Combining the bottom impeller with the propulsion impeller resulted in improved axial recirculation of the fluid. In all experiments involving the bottom impeller, the locations with the highest shear rate and maximum radial velocity components coincided, indicating the dominance of the radial velocity component in determining the shear rate. The mixing efficiency was found to be the highest for the propulsion impeller combined with the PBCF, followed by the propulsion impeller alone and the combination of all three impellers. The use of the bottom impeller alone yielded the lowest mixing efficiency. Additionally, the installation of the propulsion impeller improved the mixing efficiency while causing only a marginal increase in power consumption.

Numerical investigation of the interstage backmixing in multistage compartmented agitated column with single phase

BackgroundMultistage compartmented agitated column (MSAC) is widely used in extraction and chemical reaction. Interstage backmixing determines reactor performance, which is controlled by open channel area and its attaching draft tube in divider stage. However, the relation between backmixing and flow pattern condition within different internal structures and impeller types is still confused. In this work, the backmixing characteristics in a four stage MSAC have investigated, in order to explore the effect of opening channel radial position, draft tube direction and impeller type. MethodsThe flow condition especially for backmixing in MSAC is simulated by CFD. The backmixing intensity in each case is determined based on the simulated RTD normalized variance. Significant FindingsResults show that the variation of backmixing intensity is clarified with the analysis of circulation loop flow pattern, flow resistance, mixing intensity and impeller feature. The backmixing rate decreases first and then increase along the radial position, which has controlled by the fluid circulation loop. The backmixing rate reduced with the adding of draft tube due to the increasing flow resistance. Furthermore, strong mixing lead to higher backmixing intensity, and the axial flow impeller features with large backmixing intensity under unit stirring powder density.

Numerical Investigation on Pairing Solutions of Non-Positive Displacement Pumps and Internal Gear Pump for High-Speed Design

Raising the working speed of hydraulic pumps to maximize the efficient matching range of electric motors is one of the possible ways to achieve energy efficiency in electric machinery. By means of a simulation method verified with subsequent experiments in terms of filling efficiency, this paper first analyzed the suction capacity of crescent-type internal gear pumps with different geometric parameters at high speed, and the gear pair that is more suitable for high-speed operation was obtained. Subsequently, as the more significant contributions, two pairing solutions of a non-positive displacement pump and an internal gear pump were proposed to pressurize the inlet of the gear pump to keep it from cavitating. In the compact design solution, the inclined-holes type and axial-flow blade pumps share the same speed as the hydraulic pump, while the decentralized layout solution allows for flexible adjustment of the centrifugal impeller-type pump speed to maximize the filling capability. The final simulation results show that, with the help of inclined-holes type and centrifugal impeller type pumps, the filling efficiency of the internal gear pump at 6000 rpm can be improved by 3.59% and 5.84%, respectively, while the axial-flow blades pump fails to eliminate cavitation regardless of speed. Moreover, when the hydraulic pump works at 6000 rpm, the centrifugal impeller speed needs to be set above 2500 rpm to make sense.

A Methodical Approach to Scaling Up an Aerated Coaxial Mixer Containing a Shear-Thinning Fluid: Effect of the Fluid Rheology

The evolution of the rheological behavior of the fluid is one of the primary challenges encountered in the scale-up of the most aerated reactors. In fact, mixing efficiency diminishes because of the changes in the fluid rheological properties. Under these circumstances, it is challenging to keep the mass transfer constant upon scale-up. A thorough literature review revealed that no scale-up study of aerated coaxial mixers has considered the effect of varying fluid rheological properties. Therefore, to analyze the scale-up of these aerated mixing systems, the effects of the impeller speed and type, fluid rheology, and aeration rate on the gas hold-up, local mass transfer coefficient, bubble size distribution, hydrodynamics, and specific power consumption were explored. Electrical resistant tomography, dynamic gassing-in, and computational fluid dynamics methods were employed. For the first time, a systematic approach based on a constant volumetric mass transfer has been proposed for the scale-up of aerated coaxial reactors at different fluid rheological properties.

Power consumption and oxygen transfer optimization for C5 sugar acid production in a gas-liquid stirred tank bioreactor using CFD-Taguchi method

Power consumption and oxygen transfer are considered the two most important direct indexes, affecting the effective and cost-efficient C5 sugar acid fermentation from C5 sugar. In this work, an effective optimization approach combining computational fluid dynamics (CFD) modeling and the Taguchi method, was presented to evaluate C5 sugar acid fermentation in a gas-liquid stirred tank bioreactor. Three most critical control factors of impeller type (Rushton turbine (RT), concaved blade disc turbine (CBDT), and four wide-blade hydrofoil impeller pumping down (WHd)), agitation speed and aeration rate involved three levels, were quantitatively studied by numerical simulation based on a validated CFD model. Results indicated that, the WHd impeller gave the best energy-saving performance, the CBDT impeller gave the best oxygen transfer performance, while the RT impeller was the most balanced one. The agitation speed contributed most to both the power consumption and oxygen transfer, while exerting minor impact on compromise indexes. The aeration rate had little contribution to power consumption and oxygen transfer, while deserving more attention when energy efficiency and trade-off optimization are considered. These findings can be used as guidelines to achieve efficient and economical C5 sugar acid production.

Influence of Impeller and Mixing Tank Shapes on the Solid–Liquid Mixing Characteristics of Vanadium-Bearing Shale Based on the DEM-VOF Method

The mixing tank is important equipment for industrial applications in the wet vanadium extraction process, but in practice, there are problems, such as uneven mixing of minerals. In this study, the effect of different types of impellers and different mixing tank structures on the suspended mass of particles was simulated using the discrete element method and volume of fluid method (DEM-VOF). The simulation results show that the round-bottomed tank performed mixing better than the flat-bottomed tank at different particle densities, and the flat-bottomed tank was prone to particle stratification and other phenomena. The round-bottomed mixing tank could better improve the solid–liquid suspension effect. In this study, the coefficient of variation σ was introduced to characterize the suspended mass of particles. By monitoring the σ value, it was found that the blade pitch angle 45 (BPA45) had the best mixing uniformity in the inclined pitched blade turbine (PBT). As the PBT impeller pitch angle increased, the particle suspension increased. When comparing different types of impellers, the Rushton exhibited a 45% improvement in mixing uniformity relative to the BPA45. Second, the width and height of the trough bottom projection were optimized and their σ values were calculated separately for different parameter conditions. The width of 0.05 m and height T/4 (T being the diameter of the tank) were finally determined to be the optimum parameters for the optimal design of the vanadium shale leaching mixing trough.

Drop size distribution in batch stirred tank at high organic to aqueous phase ratios

Hydrodynamic studies were carried out at high organic to aqueous (O/A) phase ratios in a liquid-liquid batch stirred tank. Minimum mixing speed for complete dispersion, Sauter mean diameter, and drop size distribution have been measured with Rushton turbine and pitched blade turbine for three different liquid-liquid systems. Experiments have been performed at various impeller speeds and organic-to-aqueous phase ratios. Minimum mixing speed for complete dispersion (Nmin) was measured by visual observation as well as by sample withdrawal technique. Surfactant stabilization technique has been used to measure the drop size. Minimum mixing speed was found to be strongly dependent on impeller type and organic-to-aqueous phase ratios. About 10–40% decrease in minimum mixing speed was observed when organic to aqueous phase ratio was increased from 10 to 50. Sauter mean diameter was significantly affected by impeller speed, physical properties of the liquid systems, and dispersed phase holdup. Experimental drop size distributions were fitted with the log-normal distribution. Empirical correlations have been developed to predict minimum mixing speed and Sauter mean diameter at various operating conditions. Absolute Average Relative Error for the prediction of minimum mixing speed and Sauter mean diameter using developed correlations were found to be 18.45% and 11.06%, respectively.

CFD simulation of hydrodynamics and mixing performance in dual shaft eccentric mixers

This work aims to systematically study hydrodynamics and mixing characteristics of non-Newtonian fluid (carboxyl methyl cellulose, CMC) in dual shaft eccentric mixer. Fluid rheology was described by the power law rheological model. Computational fluid dynamics was employed to simulate the velocity field and shear rate inside the stirred tank. The influence mechanism of the rotational modes, height difference between impellers, impeller eccentricities, and impeller types on the flow field have been well investigated. We studied the performance of different dual-shaft eccentric mixers at the constant power input with its fluid velocity profiles, average shear strain rate, mixing time and mixing energy. The counter-rotation mode shows better mixing performance than co-rotation mode, and greater eccentricity can shorten mixing time on the basis of same stirred condition. To intensify the hydrodynamic interaction between impellers and enhance the overall mixing performance of the dual shaft eccentric mixers, it is critical to have a reasonable combination of impellers and an appropriate spatial position of impellers.

Effect of impeller design on the properties of Li1.03Ni0.8Mn0.1Co0.1O2 cathode material synthesized via co-precipitation method

Li1.03Ni0.8Mn0.1Co0.1O2 (NMC811) is the most promising composition for lithium-ion battery cathodes due to its low cobalt content and high capacity. The most widely used method to synthesize NMC811 is co-precipitation. Even though the co-precipitation process requires great control over each parameter, research that sheds light on the effect of impeller types on the electrode material’s electrochemical performances is very limited. In this study, computational fluid dynamic (CFD) simulations for different types of impellers (pitched blade, hydrofoil blade, propeller, and Rushton turbine) were carried out using the Taguchi L4 array. The impellers were 3D printed, and the precursors (Ni0.8Mn0.1Co0.1(OH)2) were synthesized by utilizing those printed impellers. Simulations were used to gain insight into how impeller type affects the flow pattern, hence the final electrochemical performance of NMC811. The best cycle performance was obtained when a propeller-type impeller was used in coprecipitation. It delivered a discharge capacity of 174.58 mAh/g at a C/20 rate, with a coulombic efficiency of 96.02%. On the other hand, the Rushton turbine yielded the worst initial discharge capacity of 100.12 mAh/g at a C/20 rate. This significant difference proves that impeller geometry affecting the flow pattern strongly influences the electrochemical performance of the cathode.

CFD-PBM Investigation on Droplet Size Distribution in a Liquid–Liquid Stirred Tank: Effect of Impeller Type

The influence of impeller type on the liquid–liquid dispersion system was investigated by computational fluid dynamics coupled with the population balance model (PBM). Rushton turbine (RT), pitched-blade turbine (PBT), and parabolic blade turbine (PB) produce different flow fields and turbulence distribution. The droplet size distribution (DSD), breakage frequency, and coalescence rate were predicted with the Alopaeus breakage model and the CT coalescence model. The simulated velocity field and DSD were validated with particle image velocimetry and image analysis, respectively. The analysis of the interaction between eddy and droplet shows that the turbulent inertial regime was the dominant mechanism of droplet breakage in the impeller region for radial-type impellers (RT and PB), while the turbulent viscous regime for an axial impeller (PBT). RT and PB can produce smaller droplets than PBT, about 16.4 and 10.7%, respectively. The average turbulent dissipation rates of RT and PB are about 7 and 10 times that of PBT in the impeller region, which explains the better performance of these two radial impellers in terms of droplet breakup.

Enhanced ammonia removal from skim latex using air bubbles in an agitated column

AbstractThe initial aim of the paper is to improve the ammonia removal efficiency from skim latex using air stripping in an agitated column. The effects of air flow rate, bubble sizes, types of impellers, and rotational speed were investigated. The results showed that ammonia decreased with the increased air flow rate and the decreased bubble size. More ammonia could be removed by the use of impellers at a low rotational speed. The axial flow impeller showed higher ammonia removal than that gained from the radial flow impeller. It could be concluded that the stripping process in an agitated column should be operated at an air flow rate under the homogeneous regime without pH and temperature adjustment. The use of axial flow impeller at a rotational speed below the turbulent flow is recommended for more ammonia removal. In addition, smaller bubbles than the working range proposed in this research should be avoided because of foaming formation of the skim latex.

Investigation of the Intensified Chaotic Mixing and Flow Structures Evolution Mechanism in Stirred Reactor with Torsional Rigid-Flexible Impeller

This investigation addresses the development of a Möbius strip with torsional structure as the flexible connection pieces for rigid-flexible impellers, enhancing the macroinstability of the flow field structure, the fluid transfer efficiency, and the chaotic mixing degree in the stirred tank. The effects of intrinsic parameters, including the impeller types and length and width of the flexible connection piece among impellers on the laminar flow field were explored. In addition, the chaotic characteristic parameters, helicity distribution, vorticity distribution, flow field structure evolution, power consumption, and fluid velocity of different rigid-flexible impeller systems were investigated as well. The experiment and computational fluid dynamics calculations demonstrated that the DRFMSC-PBDT system with torsional structure has better mixing characteristics at a lower level for power consumption, being clearly superior to DRFC-PBDT and DRFTSC-PBDT in the LLE and NTm values. The torsional structure of the Möbius strip could facilitate strengthening to form the axial circulation of the flow field, decreasing mass transfer resistance and destroying the stability of the flow field structure while contributing to improving the mixing efficiency of the system. In addition, the enhanced superior proportion of the stagnant zone and the mixing zone is also attributed to the increased secondary flow, as well as the generated perturbation wave with larger amplitude and smaller frequency, which are responsible for mixing in laminar flows.

Study on hydrodynamics characteristics in a gas-liquid stirred tank with a self-similarity impeller based on CFD-PBM coupled model

BackgroundIn general, radial impeller has been the most widely employed for the gas-liquid mixing process in the stirred tank. However, gas cavities are easy to form behind the impeller blades, which results in the waste of power consumption, the limited gas handling capacity of impeller and the poor dispersion of gas. Based on self-similarity property of nonlinear theory, a type of self-similarity impeller was employed to strengthen gas-liquid dispersion process in this work. MethodsThe hydrodynamics of gas-liquid dispersion process in a stirred tank with Rushton turbine and self-similarity impeller were comparatively investigated by computational fluid dynamics (CFD) simulation combined with a population balance model (PBM). The gas holdup distribution, gas cavities, relative power demand (RPD), bubble size distribution and turbulent intensity analysis in the gas-liquid dispersion process were predicted. Significant findingsResults showed that self-similarity impeller could destroy the gas cavity structure, reduce the negative pressure zone and gas accumulation, enhance the relative power demand (RPD) and improve the uniformity of gas holdup distribution compared with Rushton turbine, and the gas-liquid mixing efficiency can be further improved with the increase of the self-similar iteration number of self-similarity impeller. The proper increase of impeller speed was beneficial to overcome gas flooding and improve the gas-liquid two phase dispersion uniformity. The increase of gas flow rate obviously increased the gas holdup in liquid phase. Meanwhile, self-similarity impeller could increase the uniformity of bubble size compared with Rushton turbine, and increasingly so with the increase of self-similar iteration number of self-similarity impeller. The uniformity of bubble size was improved with the increase of impeller speed and was decreased with the increase of gas flow rate. In addition, self-similarity impeller could significantly enhance the turbulent intensity and turbulent kinetic energy dissipation rate by the jet flows through the concave-convex edges, which was beneficial to the gas dispersion process.

Machine Learning-Derived Correlations for Scale-Up and Technology Transfer of Primary Nucleation Kinetics.

Scaling up and technology transfer of crystallization processes have been and continue to be a challenge. This is often due to the stochastic nature of primary nucleation, various scale dependencies of nucleation mechanisms, and the multitude of scale-up approaches. To better understand these dependencies, a series of isothermal induction time studies were performed across a range of vessel volumes, impeller types, and impeller speeds. From these measurements, the nucleation rate and growth time were estimated as parameters of an induction time distribution model. Then using machine learning techniques, correlations between the vessel hydrodynamic features, calculated from computational flow dynamic simulations, and nucleation kinetic parameters were analyzed. Of the 18 machine learning models trained, two models for the nucleation rate were found to have the best performance (in terms of % of predictions within experimental variance): a nonlinear random Forest model and a nonlinear gradient boosting model. For growth time, a nonlinear gradient boosting model was found to outperform the other models tested. These models were then ensembled to directly predict the probability of nucleation, at a given time, solely from hydrodynamic features with an overall root mean square error of 0.16. This work shows how machine learning approaches can be used to analyze limited datasets of induction times to provide insights into what hydrodynamic parameters should be considered in the scale-up of an unseeded crystallization process.

ESTIMATION OF GAS-DYNAMIC PARAMETERS AT THE EXIT OF THE IMPELLER DURING MODERNIZATION OF MI-2MSB FAN INSTALLATION

Purpose. Analysis of methods to increase the efficiency of the cooling system of theAI-450M engine units of the Mi-2MSB helicopter and evaluation of gas-dynamic parameters at the impeller outlet, fan installation MI-2MSB Research methods: finite element method (FEM). Results. It was shown that the use of a centrifugal fan as the main element in the system of air injection, cabin air conditioning and cooling systems and engine units provide the following opportunities and improvements: - at constant speeds and without changes in the transmission system to increase the amount of running air by 200…300 %; - reduce the temperature of heated units to the values recommended by the operation manual; - to increase the service life of complex-loaded elements of the system of connection of free turbine shafts with the shaft of the main gearbox; - reduce the risk of accidents due to poor air conditioning in the cockpit and passenger seats. The analysis of possible types of C.S modernization was carried out, the estimated estimation of gas-dynamic parameters at the exit of the impeller - to the sub-radiator space was carried out. The problem was solved by changing the type of impeller from axial to centrifugal. Scientific novelty. The problem of creating an efficient and reliable cooling system for internal systems and units of the Mi-2MSB light multi-purpose aircraft, which has been modernized with the replacement of old GTD-350 engines with newer ones, AI-450 series - urgent, in the absence of similar light helicopters of domestic production. An important component of the safety and reliability of all components of the helicopter is to maintain the correct thermal regime of its components. Practical value. The obtained results are important in the further process of production and modernization of the Mi-2 helicopter of all modifications with the latest engines, as well as for helicopter development projects in Ukraine - SME-2 “Hope”, SME-6 “Otaman”, SME-8 and others. The ability to increase cooling efficiency, air conditioning and reduce engine load increases the life, reliability of components and improves comfort and performance for pilots and passengers.

Experimental tests of submersible vane pumps

The technical task of creating new designs of submersible vane pumps is to maintain stable operating parameters and increase the productivity of the pumping station with periodic regeneration and sediment removal. The pumping well station contains an outer chamber and an inner chamber, in which a pumping unit is installed, and pipelines are connected to the lower and upper pools. In the structure under study, the upper parts of the outer and inner chambers are equipped with a sealed head, and the lower part of the outer chamber is equipped with a stopper. The side surface of the inner chamber is made of elastically deformable material. An elastic pipeline with an ejector at its end with curvilinear helical grooves on the inner surface of the nozzle part of the ejector is connected to the pipeline connected to the tailpipe, and water level meters are installed in the outer chamber. The technique of balance testing of new designs of submersible vane pumps was applied because the existing technology is insufficient for correct balance tests. Research methods involve the design of the impeller, which is rigidly mounted on the shaft. The methodology has been adjusted to apply to multistage pumps with different types of impellers. In the energy balance of this pump, the power losses due to friction in the individual axial support of the impeller are additionally determined. Experimental work was carried out, resulting in measurements of the hydrodynamic moment acting on the guide vane grate. Experimental work was carried out on a vertical stand with new pump impellers ETsV-10-120-40 and with a service life of 1 year. Parametric tests made it possible to determine the change in the external parameters of the pump depending on changes in its operating conditions and network characteristics.

Low pressure centrifugal fans operating with different air temperatures

For normal operating conditions of the centrifugal fan, the manufacturers provide operating curves (total pressure of the fan, static pressure of the fan, power, and efficiency) for standard air conditions. However, when a fan operates with air at different, usually elevated temperatures, their operating curves can significantly differ. As a result, the fan efficiency decreases, and the energy efficiency of the fan may be reduced. Fan operation in such air conditions also affects its acoustic characteristics. This paper investigates two types of centrifugal fans: with forward curved and backward inclined blades. The main goal was to determine how their operating and acoustic characteristics change with the change in air temperature. For this analysis, low pressure centrifugal fans are used, for which we already had measured operating and acoustic characteristics. The influence of the type of impeller and the curvature of the blades play an important role in the operation of the fan. For numerical investigation, ANSYS CFX software was used, and obtained results show excellent agreement with experimental measurements.

Construction of pressure characteristics of a centrifugal radial fan using ANSYS CFX software package

Purpose. Improve the design and pressure characteristics of the centrifugal radial fan (CRF), reduce costs and design time by using modern design methods. Methods. Analytical study of the energy characteristics of the CRF using CFD software packages. Three-dimensional modeling of the flow of air in the flow part of the fan. Results. The paper describes the peculiarities of construction of the pressure characteristic of a centrifugal radial fan using the ANSYS CFX program. Numerical simulation of the flow was carried out to improve the initial indicators at the preliminary stage of the design of the CRF. This approach allows reducing costs and design time compared to the experimental approach and provides an opportunity to improve and analyze the performance of the fan and its design without manufacturing it. The use of a calculation complex of programs for the justification and analysis of the design results provides an opportunity to see the picture of the pressure distribution along the flow part, the field of velocity vectors and the movement of the air flow. By means of numerical modeling of the spatial air flow in the flow part of the fan, choosing the SST-turbulence model, the regularity of the change in the pressure characteristic of the fan was the distribution of velocities and pressures in different elements of the air conditioning system, at different values of the mass flow of air, was determined. An analysis of the change in total and static pressure in the flow part of the CRF was performed: in the stator – an inlet nozzle, in the rotor – a closed type impeller, and in the stator – made in the form of a snail. The question of the dependence of the total and static efficiency on the mass flow rate of the fan is also considered. Conclutions 1. Studies of the process of construction of the pressure characteristic of the CRF showed that the proposed approach allows you to reliably estimate the parameters of the fan’s operating modes, determine the main features of the change in determined. As a result of the calculation, efficiency and the distribution of full and static pressure in the elements of the flow part for its further improvement. 2. A distinctive feature of the proposed method of constructing the pressure characteristic is that in the early stages it is possible to predict the hydrodynamic parameters of the flow part of the designed fan without creating its solid-state model. And based on the results of a numerical study of the spatial air flow, it is possible to quantitatively and qualitatively analyze the elements of the flow part of the fan and specify their geometric dimensions for further calculation based on average parameters. 3. The ANSYS 19.0 CFX software complex allows you to immediately display changes in the design of fan assemblies and obtain the results of a numerical study of the spatial air flow in the flow part of the fan. Using the proposed graphic materials, it is possible to visually observe the processes taking place in the flow part of the CRF. The possibility of numerical calculation of the parameters of interest is also shown. 4. The creation of a real CRF to evaluate its performance requires significant funding and is time- consuming, while the use of CFD is fast and cost- effective. The ANSYS 19.0 CFX software package makes it possible to visually present a picture of the behavior of a wide range of process parameters that occur in the flow part of the fan and to show their relationship with the features of the geometry and dimensions of the fan. Keywords: total pressure, static pressure, nozzle, impeller, volute, CFD, mass flow, total efficiency, static efficiency.