Outlet Of Chamber Research Articles

Multi-objective optimization of self-excited oscillation heat exchange tube based on multiple concepts

• NSGA-II is used to optimize the self-excited oscillation heat exchange tube. • The RSM models between Nu and f and structural parameters are obtained. • The friction factor of the optimized heat exchanger tube is reduced by 27.37%. • The velocity field and temperature field of the heat exchanger pipe are analyzed. It is a typical multi-objective optimization problem for self-excited oscillation heat exchange tube to enhance heat transfer by limiting pressure drop. In this study, the conflict between heat transfer and pressure drop is solved by multi-objective optimization method. The design parameters are three dimensionless structural parameters, which are collision wall angle (100° ≤ α ≤ 140°), the diameter ratio of chamber outlet to inlet (0.8 ≤ d 2 / d 1 ≤ 1.6) and the length-to-diameter ratio of chamber (0.4 ≤ L T / D T ≤ 0.6). The purpose of optimization is to compromise Nusselt number Nu and friction factor f . The sample points are obtained by CCD. The RSM models of Nu and f are constructed, and variance analysis and sensitivity analysis are carried out for the models. Finally, the Pareto front is obtained by NSGA-II and verified by CFD, the compromise solution is obtained by TOPSIS method. The results show that the most significant factor of Nu and f is d 2 / d 1 . The optimized structural parameters of the compromise solution are α = 125.67°, d 2 / d 1 = 1.2505, L T / D T = 0.4036, and the corresponding Nu and f are 149.8528 and 0.1144, respectively. Compared with the original structure, Nu increases by 1.54% and f decreases by 27.37%, which indicates that the convective heat transfer is enhanced and the flow resistance is significantly reduced.

Analysis of dynamic characteristics and sensitivity of hydrogen-oxygen expansion cycle rocket engine system

The success of the launch mission depends on the dynamic characteristics of the rocket engine system, while the engine development process is based on the parameter sensitivity analysis. However, the dynamic characteristics and parameter sensitivity of the hydrogen-oxygen expansion cycle engine remain unclear. This research built the simulation model of basic components and overall system of the hydrogen-oxygen expansion cycle engine. A 3-factor and 9-level numerical simulation study was carried out based on the structural parameters of the cooling channel. Results show that at 0.1s after the ignition of the engine, the speed of oxygen pump drops by 16.4%, while the torque of the hydrogen turbine drops by 43.6%. The rise of coolant temperature between the inlet of the cooling channel and the outlet of combustion chamber is about 185 K, which is about 4 times of that between the outlet of combustion chamber and the first section outlet of the nozzle. The sensitivity of the response time to the rib height reaches 0.36, while the sensitivity of response time to the rib width and the nozzle wall thickness are 0.15 and 0.12, respectively. These findings contribute to the start-up analysis and design of the hydrogen-oxygen expansion cycle engine.

Influence of Chamber Geometrical Parameters on Suppressing Explosion Propagation

In this article, the effect of a chamber’s geometrical parameters on suppressing gas explosion propagation was studied. Three rectangular chambers were used in the study, with a constant length of 0.5 m, a constant height of 0.2 m, and a variable width of 0.3 m, 0.5 m, and 0.8 m; each chamber was installed in a pipeline system for experimental research. The experimental results showed that when the chamber length and height were fixed at 0.5 m and 0.2 m, respectively, the suppression effect of the chamber on the explosion shockwave improves with the increase in the chamber width; when the chamber width increases to 0.8 m, the chamber has suppressive effect on explosion shockwave propagation. It was also found that the suppression effect of the chambers on the explosion flame improves with the increase in the chamber width; when the width of the chamber is 0.5 m, the chamber effectively suppresses explosion flames. Based on the experimental results, a numerical model was established to simulate the suppression effect of five types of chambers with a length, width, and height of 0.5 m × 0.3 m × 0.2 m, 0.3 m × 0.5 m × 0.2 m, 0.5 m × 0.5 m × 0.2 m, 0.5 m × 0.8 m × 0.2 m, and 0.8 m × 0.5 m × 0.2 m, respectively. The numerical simulation results indicated that when the chamber length and height are constant at 0.5 m and 0.2 m, respectively, the suppressive effect of the chamber on the shockwave improves as the chamber width increases; when the chamber width increases to 0.8 m, the shockwave overpressure at the chamber outlet is attenuated by 10.61%, indicating that the chamber suppresses the propagation of explosion shockwave, which is consistent with the experimental results obtained in the study. It was also found that when the chamber width and height were constant at 0.5 m and 0.2 m, respectively, as the chamber length increases, the overpressure increases first and then weakens. When the chamber length increases to 0.8 m, the overpressure at the chamber outlet is attenuated by −14.16%, indicating that the chamber is not able to suppress the propagation of explosion shockwave. Finally, a numerical simulation of the propagation process of a methane-air mixture and explosion flames in different chambers was performed to analyse the effect of chamber geometrical parameters on explosion suppression effect.

The application of thermal-calculation methods in the design and syngas prediction of entrained-flow coal gasifiers

A novel thermal-calculation method for membrane wall entrained-flow coal gasifier based on the equilibrium model was proposed in this study, and the method takes into account the heat transfer of the gasifier. The equilibrium model was established by the Gibbs free energy minimization method to avoid solving the intermediate chemical reaction process. The concepts of effective radiation heating area of furnace and flame center modification factor were introduced into the thermal-calculation method. This study not only analyzes the influence of oxygen-to-coal and water-to-coal ratios under normal operating conditions, but also investigates the impact of structural characteristics of a membrane wall entrained-flow gasifier on gasification characteristics. The model was effectively used to predict the syngas composition, the syngas temperature at the outlet of the chamber, and the energy distribution of the gasifier. The syngas composition and heat loss of gasifier obtained by thermal-calculation method are in good agreement with the experimental data of industrial-scale plants. The results show that the oxygen-to-coal ratio significantly impacts the syngas composition and heat loss than the water-to-coal ratio. Increase in the effective radiation heating area of furnace results in the decrease in the syngas temperature at the outlet of chamber, thus reducing the heat loss of flue gas and improving the heat absorption of the membrane wall tube. However, simultaneously, it can also reduce the CO concentration in syngas. Reduction in the flame center modification factor is helpful to increase the CO concentration; however, it also causes colossal heat loss of flue gas.

Research on New Energy Technology in Energy-Saving and Emission-Reduction Low-Pollution Aerospace Engine

Under the national energy technology call for energy saving and emission reduction, the paper uses FLUENT software to simulate three-dimensional, two-phase, turbulent combustion in the combustion chamber of a certain type of aeroengine at the maximum and ground idle state and calculates the generation of CO and UHC. The value of temperature field, velocity field and concentration field. Through simulation, it is found that the maximum temperature of the flame is located at the axial position of the main combustion hole. The flame temperature begins to decrease after reaching the maximum temperature near the main combustion hole. In the temperature field of the combustion chamber outlet, the maximum temperature of the outlet section is 1820K and the average temperature is 1342K.The temperature distribution is relatively uniform overall. CO and UHC are mainly generated under low operating conditions, but the oil-gas ratio has a greater impact on pollutant emissions.

Design, Numerical and Experimental Investigation of High Swirling Flow in an Annular Combustion Chamber

In this study, an annular combustion chamber of a turbojet engine with a net trust of 1650N is designed. Kerosene is considered as fuel in this study. The design consists of evaluation of the reference quantities, calculation of the required dimensions, estimation of air distribution and pressure drop, estimation of the number and diameter of air admission holes, as well as aerodynamic considerations. The design process is accompanied by Computational Fluid Dynamics (CFD) based on RANS simulation. Three-dimensional simulation of the reacting process within the combustion chamber is carried out based on the finite volume method. The RNG turbulent model and the finite rate/eddy dissipation combustion model are considered in the present study. Finally, the (atmospheric test) AT rig of the combustion chamber is explained. The Turbine Inlet Temperature (TIT) of combustion chamber is measured at different operating conditions. The TIT values in the numerical simulation and experimental measurement are 1191.1K and 1227 K, respectively, in the design point. The SN and the angle of the RZ are equal to 0.9955 and 35.26 degree, respectively. The temperature, velocity and pressure fields of RZ, air-fuel mixture, combustion turbulence are then presented in image outputs and graphs. The results indicate that the temperature distribution at the outlet of combustion chamber is relatively uniform.

Biogas Dry Reforming for Hydrogen through Membrane Reactor Utilizing Negative Pressure

Biogas, consisting of CH4 and CO2, is a promising energy source and can be converted into H2 by a dry reforming reaction. In this study, a membrane reactor is adopted to promote the performance of biogas dry reforming. The aim of this study is to investigate the effect of pressure of sweep gas on a biogas dry reforming to get H2. The effect of molar ratio of supplied CH4:CO2 and reaction temperature is also investigated. It is observed that the impact of psweep on concentrations of CH4 and CO2 is small irrespective of reaction temperature. The concentrations of H2 and CO increase with an increase in reaction temperature t. The concentration of H2, at the outlet of the reaction chamber, reduces with a decrease in psweep. It is due to an increase in H2 extraction from the reaction chamber to the sweep chamber. The highest concentration of H2 is obtained in the case of the molar ratio of CH4:CO2 = 1:1. The concentration of CO is the highest in the case of the molar ratio of CH4:CO2 = 1.5:1. The highest sweep effect is obtained at reaction temperature of 500 °C and psweep of 0.045 MPa.

The regulation effect of methane and hydrogen on the emission characteristics of ammonia/air combustion in a model combustor

Ammonia, made up of 17.8% hydrogen, has attracted a lot of attention in combustion community due to its zero carbon emission as a fuel in gas turbines. However, ammonia combustion still faces some challenges including the weak combustion and sharp NOx emissions which discourage its application. It was demonstrated that the combustion intensity of ammonia/air flame can be enhanced through adding active fuels like methane and hydrogen, while the NOx emission issue will emerge in the meantime. This study investigates regulation effect of methane and hydrogen on the emission characteristics of ammonia/air flame in a gas turbine combustor. The instantaneous OH profile and global emissions at the combustion chamber outlet are measured with Planar Laser Induced Fluorescence (PLIF) technique and the Fourier Transform Infrared (FTIR), respectively. The flames are also simulated by large eddy simulation to further reveal physical and chemical processes of the emissions formation. Results show that for NH3/air flames, the emissions behavior of the gas turbine combustor is similar to the calculated one-dimensional flames. Moreover, the NOx emissions and the unburned NH3 can be simultaneously controlled to a proper value at the equivalence ratio (φ) of approximate 1.1. The variation of NO and NO2 with φ for NH3/H2/air flames and NH3/CH4/air flames at blending ratio (Zf) of 0.1 are similar to the NH3/air flames, with the peak moving towards rich condition. This indicates that the NH3/air flame can be regulated through adding a small amount of active fuels without increasing the NOx emission level. However, when Zf = 0.3, we observe a clear large NOx emission and CO for NH3/CH4/air flames, indicating H2 is a better choice on the emission control. The LES results show that NO and OH radicals exhibit a general positive correlation. And the temperature plays a secondary role in promoting NOx formation comparing with CH4/air flame.

Комплексная эффективность применения древесных гранул в энергоустановках

In advanced countries, the dramatic impact of greenhouse gases on the global climate is reduced by replacing fossil fuels with biofuels. This method is being actively encouraged. However, by-products of logging, processing and conversion of wood are classified as difficult to burn fuels due to their high moisture content, low energy density and extremely heterogeneous granulometric composition. A promising direction to increase the energy density and transportability of the timber industry by-products is their granulation. Wood pellet fuel burning in heat-generating plants results in significant increase in their energy and environmental performance. The purpose of the paper is an experimental and calculation study of the energy and environmental performance of 4 MW hot water boilers produced by Polytechnik Luft- und Feuerungstechnik GmbH in the process of burning pine and spruce wood pellets obtained from by-products woodworking. When performing studies, the components of the boiler’s heat balance, gas release, and particulate emissions were determined. Numerical modeling of thermochemical and aerodynamic processes taking place in the boiler combustion chamber was carried out by using the Ansys Fluent three-dimensional simulation software. Together with industrial-operational tests it showed the possibility to reduce the total share of flue gas recirculation into combustion chambers of boiler units to values not exceeding 0.45, in providing an acceptable temperature of combustion products at the combustion chamber outlet and maintaining minimum emissions of carbon and nitrogen monoxides. At the same time, the share of gases fed by recirculation smoke exhausters to the over-bed area of the burner should have higher values than under the reciprocating grates of boilers. Guidelines for comprehensive improvement of wood pellet combustion efficiency in combustion chamber of 4 MW hot water boilers have been developed and implemented. The priorities are: using the air passed through the cooling channels of the setting as secondary air; reducing the rarefaction in the combustion chambers to 30–70 Pa; optimizing the ratio of primary and secondary air, herewith, the share of primary air in the total flow should be 0.26–0.35. Implementation of the developed guidelines allowed to increase the boiler gross efficiency by 0.5–1.8 %, to reduce the aerodynamic resistance of the gas path by 15–20 % and to ensure consistently low emissions of carbon and nitrogen monoxides and soot particles. When designing boiler units for burning wood pellet fuel it is advisable to place heating surfaces in the combustion chamber, included in the circulation circuit of the boiler. This will increase the efficiency and life cycle of the boiler unit.

Experimental study on heat release characteristics of thermochemical heat storage considering various operating parameters

Thermochemical heat storage is a promising energy storage method and has received much attention in recent years. To improve the design and application of such systems, a better understanding of the characteristics of thermochemical heat storage is required. In this study, we analyze the heat release characteristics of thermochemical heat storage considering various operating parameters, such as charging temperature, humidity, and material. Three different thermochemical materials are considered herein, namely, zeolite 13X, zeolite 5A, and silica gel. The temperature profile at the inlet and outlet of the storage chamber, and that inside the chamber packed with thermochemical material, were measured. The pressure drop across the chamber was measured as well. The results indicate that the heat release characteristics change with position and time. Furthermore, the temporal curves of released heat are significantly affected by charging temperature and humidity. Zeolite 13X rapidly released a large amount of heat within a short period of time, whereas silica gel gradually released a small amount of heat, over a longer duration of time. The pressure drop across the chamber was found to vary with the bead size of the thermochemical material. Thus, the operating parameters including charging temperature, humidity, and material, have a significant effect on the characteristics of heat release. The data obtained herein can serve as a reference for the design of thermochemical storage systems.

ВЛИЯНИЕ ТУРБУЛЕНТНЫХ ПУЛЬСАЦИЙ НА ПРОЦЕСС ФРАКЦИОННОГО РАЗДЕЛЕНИЯ МЕЛКОДИСПЕРСНЫХ ПОРОШКОВ НИТРИДОВ МЕТАЛЛОВ

This paper presents a numerical study of a two-phase swirling turbulent flow in a separation element of a vortex chamber. The paper considers a process of fractional separation in the separation chamber with three particular features in its design. The main feature is the separation mobile element located at the outlet of the separation area. Changes in the position of this element can affect the boundary size and the sharpness of the separation. The second feature of the considered separation chamber is the presence of a rotating element along the vertical axis. This element helps to align the field of the circumferential velocity component. The third feature of this chamber is the presence of a branch pipe for the auxiliary gas flow supply intended to push the particles away from the chamber wall and to blow the separated particles in order to prevent them from agglomeration. In this work, the trajectories of the motion of fine nitride particles are calculated taking into account the turbulent diffusion effect. A possibility to control the boundary size of the particles, when moving the separation element located at the outlet of the vortex chamber, is demonstrated. Numerical study results show that the turbulent pulsations cause significant changes in the separation process and affect the boundary size and the sharpness of the separation.

Combustion characteristics of ignition processes for lean premixed swirling combustor under visual conditions

The combustion characteristics of ignition processes under different ignition fuel ratios were studied on a natural gas-fueled micro gas turbine combustion chamber. With the changing of air mass flow, the equivalence ratio varied from 0.024 to 0.994 at which the fuel mass flow remained the same. The flue gas compositions were measured at the combustion chamber outlet, and used to calculate the combustion efficiency. To characterize the relative flame stability, optical measurements and digital image processing techniques were applied. The results indicate that the combustor can ignite successfully under the ignition fuel ratio conditions of 10%, 15%, and 20%, in which the corresponding equivalence ratios are 0.082–0.497, 0.082–0.746, and 0.098–0.994, respectively. Moreover, the combustion efficiency decreased with the descending equivalence ratio. However, the amount of CO and unburned CH4 in the combustion products increased as the equivalence ratio decreased. The heat release rate in the reaction zone and the morphological characteristics of the flame were obtained using the gray level of average flame images. Furthermore, the flame fluctuation was analyzed by coefficient of variation of the flame area, and the relative flame stability was analyzed by the probability distribution density of the relative flame area ratio. The appropriate equivalence ratios for ignition are around 0.245, 0.243–0.369, and 0.196–0.326 under the ignition fuel ratio conditions of 10%, 15%, and 20%. The ignition fuel ratio has considerable influence on combustion efficiency, combustion product, and flame stability.

Experimental and numerical investigation on the separation of hydrophilic fine particles using heterogeneous condensation preconditioning technique in gas cyclones

Improving the removal efficiency of gas cyclones becomes critical as air pollution aggravates. This study aims to investigate the effects of operating parameters on the process of heterogeneous condensation and separation performance of gas cyclones. For hydrophilic fine particles, an experimental apparatus was built up to analyze the heat transfer and removal efficiency. Then a two- way coupling numerical model in which the interactions between particles and gas was achieved by user defined function was adopted. Compared with experimental and numerical results, the accuracy of simulation satisfied engineering application. In addition, as the initial supersaturation degree S0 increases, the particle size at growth chamber outlet and removal efficiency increase by 69.89%, 107.01% respectively. While increasing the gas flow rate F decreases particle size by 3.59% and increases removal efficiency by 17.91%. By heterogeneous condensation preconditioning technique, the removal efficiency for fine particles can reach 95.12%. These results can help optimize and apply this preconditioning technique of gas cyclones in engineering.

Mixing process of two streams within a steam ejector from the perspectives of mass, momentum and energy transfer

There is not a specific technical proposal to be able to achieve a clear presentation of the complex mixing process between the primary and entrained flows within the steam ejector. In this study, a novel ejector model with species transport is proposed that can clearly elucidate how, when, where and to what extent the two streams mix. Systematic quantitative analysis toward the mixing of two streams is performed from the perspectives of mass, momentum and energy transfer. Further, the similarities and differences of the mixing process among three analytical perspectives are clarified. Key results revealed that the mixing mainly occurs at the nearby of the local mixing layer, and there are still some distances from the homogenous mixing state after the mixing chamber process, only up to 80.6% the mixing uniformity φ obtains. Additionally, the mixing layer follows a similar growth trajectory, and φ increases as mixing continues regardless of an analytical perspective. However, a much faster mixing is observed from the mass transfer perspective. Specifically, φM (80.6%) is significantly larger than φV (60.7%) and φE (59.6%) at the mixing chamber outlet. It can be concluded that the essential mass mixing laws of the two streams are not necessarily achieving a complete replication whether from the perspective of momentum or energy transfer. These key findings provide a more in-depth and comprehensive understanding of the mixing process inside the ejector.

Heat Transfer Characteristic for Premixed Flame Jet from Swirl Chamber

The objective of this research is to study flame structure and heat transfer characteristics for the premixed flame jet from the swirling chamber. In this study, LPG and air was utilized as gas fuel and oxidizer for a premixed flame. The equivalence ratios () of LPG and air were considered at 0.8, 1.0, and 1.2 under a Reynolds number Re = 4,000. The swirl flame was generated by double tangential inlets in cylindrical chamber. The diameter of chamber was fixed at D = 20 mm and the hydraulic diameter of the inlet was Dh = 5 mm. In this study, the effect of chamber geometry on flame structure was investigated by varying the chamber from H = 2.2Dh to 7.0Dh. The structures and temperature of the free flame jet was recorded with camera and measured with a thermocouple. The heat transfer rate of impinging flame jet was also measured at distance from chamber outlet to flame impingement surface varying from L = 4Dh to 10Dh. The results show that the maximum of flame temperature occurs at =1.2. Impinging flame jet for case of chamber height at H = 4.6Dh and impingement distance at L = 4Dh give the highest heat transfer for all equivalence ratios due to the reaction zone of combustion reached to approach near the heat transfer surface.

Parameter Analysis and Optimization of Annular Jet Pump Based on Kriging Model

Jet pump efficiency heavily relies on the geometrical parameters of the pump design and parameter global optimization in the full variable space is still a big challenge. This paper proposed a global optimization method for annular jet pump design combining computational fluid dynamics (CFD) simulation, the Kriging approximate model and experimental data. The suction angle, the flow ratio, the diffusion angle, and the area ratio are selected as the design variables for optimization. The optimal space filling design (OSF) method is used to generate sampling points from the design space of the four design variables. The optimization method solves the constrained optimization problem with a given head ratio by building the functional relationship established by the Kriging model between efficiency and design parameters, which makes the method more applicable. The design result shows that the annular jet pump efficiency is predicted well by the Kriging model; m is a key variable affecting the annular jet pump efficiency. As the area ratio m decreases, the mixing effect at the suction chamber outlet can be improved, but the frictional resistance increases.

Thermodynamic and thermoeconomic analyses and energetic and exergetic optimization of a turbojet engine

In this study, a thermal model for a turbojet engine is proposed. Besides the engine’s performance, the cost flow rate of each component is evaluated by performing the energetic, exergetic and exergoeconomic analyses. The compressor pressure ratio (πAC), flight Mach number (Ma) and turbine inlet temperature (TIT) are three operating variables, which affect the performance of the whole system. Therefore, a sensitivity analysis is carried out to survey the effect of these variables on objective functions (i.e., energy efficiency, exergy efficiency, and exergy destruction). It is found that there are some contradictions between exergy efficiency and exergy destruction, which by increment in TIT energy efficiency increases, while the exergy destruction decreases. Therefore, an optimization should be applied on the presented system. The results show that the highest exergy destruction, unit exergy cost, and cost rate are 34.96 GJ h−1, 34.85 US$ GJ−1 and 437.37 US$ h−1 occur in the combustion chamber, compressor’s outlet flow and combustion chamber outlet stream, respectively. The energetic and exergetic optimization solution is obtained as the Pareto frontier. Final decision-making methods such as TOPSIS, LINMAP are employed for choosing the optimal solution. Design points of LINMAP and TOPSIS having 65.86%, 66.95% thermal efficiency and 12.51 GJ h−1, 12.65 GJ h−1 exergy destruction, respectively.

Combustion Stability Analysis of Liquid Biofuels using Acoustic Signals

Biodiesel and vegetable oil suffer from higher viscosity and boiling point resulting in poor atomization and evaporation rate compared to diesel fuel additional to the lower heating value which negatively affect the stability of flame. The unsteady heat release rate from flame provides unique pressure wave signature that can be captured as acoustic wave. A pressurized combustion chamber was developed and connected to a vehicular turbocharger to test combustion stability and emissions of wide range of liquid biofuels. Biodiesel and blends of palm oil/diesel from 10% (Vol.%) up to 100% pure palm oil (i.e. P10-P100) were investigated and compared to diesel as the benchmark fuel. Microphone probes at the chamber inlet and outlet were used to capture the acoustic signals to be analyzed through the Fast Fourier Transform (FFT) using MATLAB program. The analysis of the acoustic signals revealed distinguishable deviation patterns between diesel and other biofuels which showed close resemblance to the carbon monoxide (CO) emission patterns at the same operating pressures. Biodiesel was comparable to P20, while increasing palm oil blend resulted in higher deviation. Chamber pressure also showed positive effect on combustion stability and reduced the deviation between diesel and other biofuels.

Numerical investigation of the influence of operating parameters on NOx emission characteristics under oxy-coal combustion atmosphere in a tubular combustor

In this study, NOx emission characteristics of oxy-coal combustion atmosphere have been thoroughly investigated employing the developed and validated numerical model under oxy-coal combustion atmosphere. The influence of oxy-fuel combustion atmospheres, feed gas inlet temperatures and pressures on the NOx emission (ppm) characteristics have been studied in detail. Influence of higher concentration steam addition on NOx emission under oxy-coal combustion atmosphere has also been assessed employing the developed oxy-coal combustion model. Furthermore, a quantitative summary of NOx emission at the outlet of the combustion chamber under above-mentioned operating conditions have been provided. The result showed that oxy-coal combustion cases having higher O2 concentration in the oxidizer had produced higher NOx emission due to an enhanced conversion rate of coal_N to NOx. The wet oxy-fuel combustion case (10–50% H2O in the oxidizer) has 2.5%–75% higher NOx concentration (ppm) compared to the ideal dry-recycle oxy-fuel combustion case (0% H2O in the oxidizer). The oxy-steam combustion case has 99% higher NOx concentration (ppm) compared to the ideal dry-recycle oxy-fuel combustion case.

Thermodynamic modeling and comparative analysis of a compressed air energy storage system boosted with thermoelectric unit

Current study represents the thermodynamic modeling and exergy analysis of a compressed air energy storage system boosted with thermoelectric generator (CAES/TEG). To evaluate the studied system, a comparative analysis between compressed air energy storage system (CAES) with CAES/TEG has been done. Exergy, a powerful tool for analyzing energy conversion systems, is employed to determine the exergy destruction rate and exergy efficiency of the system as well as different related components. The results of exergy analysis indicates that the wind turbine with 35.28 kW (44.81% of total exergy destruction rate) has the highest exergy destruction rate and after that in the second and third places are combustion chamber and cavern. Findings indicate that with adding thermoelectric modules to the CAES system, the output power of Rankine cycle and organic Rankine cycle increase about 1.16 kW and 0.959 kW in comparison with CAES system, which these changes lead to increasing the net output power of the system in CAES/TEG system from 33.59 kW to 35.71 kW compare with CAES. Moreover, the influences of main parameters such as compressor mass flow rate, compressor pressure ratio, and combustion chamber outlet temperature and wind speed on the CAES/TEG performance are investigated.