Air supply systems are necessary subsystems in proton exchange membrane (PEM) fuel cell systems. Compressors are the key devices of air supply systems that greatly influence the qualities of fuel cells. The simulation and experimental studies on a small centrifugal compressor with high rotation velocity have been presented within this paper. Firstly, the input guidelines of hydrogen compressor are acquired based on the productivity energy and working stress of PEM fuel cells. Then, a prototype of small centrifugal compressors applied in PEM fuel cellular material is made, simulated using the computational liquid dynamics (CFD) technique, and analyzed in actual working conditions. Lastly, the simulator outcomes show the inner flow in compressors impacts the performance strongly. The release stress of the simulation is close towards the check information in the analyzed operating problems, and also the maximum error is less than 6Percent.
These days, energy and ecological issues have strongly attracted the eye of experts during these fields. Different clear energy systems happen to be proposed and analyzed. As one highly efficient and clean power technologies, the polymer electrolyte membrane layer (PEM) fuel cell continues to be analyzed recently. The substantial applications of PEM energy cells give attention to transportation, distributed/stationary, and transportable power era.1 As well as the PEM energy cell becomes the most desirable option for energy generation in the 21st century.2
The air supply system is one of the crucial subsystems in PEM fuel cell techniques.3 The air provide system characteristics have an essential impact on the overall performance of PEM fuel cell systems. Manage techniques and the influence on the energy cell output of the air supply system had been investigated.4-7 In air provide systems, compressors are definitely the key gadgets that considerably change the air provide system and also the characteristics of energy cellular material.
Based on their working concepts, two kinds of compressors can be utilized in the PEM energy cells, which is, positive displacement compressor and dynamic compressor.
For positive displacement compressors, screw and scroll compressors were primarily selected and looked into inside the PEM energy cell system. Taking into consideration the operating atmosphere requirements of PEM energy cellular material, the compressed air should be oil-totally free or with water. Therefore, the oil-free and water-administered screw compressor was researched to be used inside a 50 kW PEM energy cell system.8, 9 The isentropic efficiency of the prototype compressor is 55Percent, using a release stress of .2 MPa and a velocity of 9000 rpm. The water-administered scroll compressor was investigated to get a 30 kW PEM energy cell with 5000 rpm.10-12 Qin et al.13 researched the working pressure impact on the overall performance of any 20 kW PEM fuel cell system depending on the experimental overall performance of co2 compressor. The results show that the ideal system working pressure is all about 1.2 atm machine. Pressure of air can be increased up to 2 bar easily by screw and browse compressors. Nevertheless the rotation speed of the attach and browse compressors can not be very high (generally lower than 10,000 rpm), which leads for the big volume and weight. Therefore, they are not ideal for cellular devices really well.
As dynamic compressors, centrifugal compressors are probably most suitable for PEM fuel cells simply because they have this kind of characteristics as high speed (related to the smaller volume and lighter in weight weight), reduced sound, higher effectiveness, and reliability. Therefore, numerous researchers have analyzed centrifugal compressors in different aspects.
Many researchers focus on the procedure of centrifugal compressors in fuel cell techniques to improve the effectiveness of PEM energy cellular material and the stability of centrifugal compressors. Empirical models14, 15 of centrifugal compressors were launched, and the available designs had been assessed using the experimental data. The powerful type of a centrifugal compressor competent at system simulation within the digital tested computational atmosphere was introduced,16 which included different compressor deficits. Plus it can be employed to virtually any centrifugal compressor and fuel cell system. A semi-mechanised and semi-imperial air provide system model based on centrifugal air compressors was recognized for a 150 kW PEM fuel cell motor.3, 5 Experimental and simulation outcomes show that the air provide system has great precision and celerity for that air compressor control. A vehicle energy cell system utilizing a two-phase turbo-compressor for air supply was investigated, and also the results show that a two-stage turbo-compressor having a turbo-expander can considerably affect general system energy and effectiveness.17 Hu et al.18, 19 analyzed the optimization of velocity response of air compressor for hydrogen fuel cell vehicle considering the transient current. As well as a new velocity regulation manage technique (the transient current injection manage method) was recommended.
Surge and stall would be the vital qualities of the centrifugal compressor.20, 21 Azizi et al.22 analyzed the stall/rise of a multiple-phase compressor within a hybrid solid oxide energy cell-gasoline turbine system. The final results show that this compressor offers a sustained air flow price throughout the moderate stall/rise occasion. Godard et al.23 analyzed the surge characterization of a centrifugal compressor for fuel cell, and the compressor surges abruptly without any pre-stall exercise with a higher rotation velocity. An agglomerate design is introduced, and a fuel cell system model including a dynamic compressor is implemented. The final results indicate that the o2 focus is most highly affected by the rise evolution of the compressor.24 Laghrouche et al.25 proposed a load governor based upon constrained extremum looking for PEM energy cell oxygen hunger and compressor rise protection, as well as the plan was confirmed by experiment. A fuzzy reasoning control solution was recommended for that compressor team providing an inlayed 5 kW PEM fuel cell system.
Several research concentrate on the design, overall performance optimization, and new bearings of oxygen generator. A nonlinear autoregressive moving typical with exogenous inputs design for an air compressor of PEMFC system was recognized,26 and it has a little fitted mistake. Wan et al.14 researched the enhanced empirical guidelines design way of iugjby compressors in PEM fuel cell car programs. As well as the water-lubricated bearing for high-speed centrifugal compressors was studied by Ren et al..27, 28 The overall performance of centrifugal compressors to get a energy cell was enhanced utilizing aerodynamic optimization and data exploration methods.29
Many of these research on centrifugal compressors used in PEM fuel cells are involved with the operating overall performance and control ways of centrifugal compressors in PEM energy cell techniques. This study provides the structural parameters of any small high-speed centrifugal compressor for PEM fuel cells, and also the primary aspects affecting the performance of compressors are discussed. The overall performance of the compressor is evaluated from the CFD method. In fact it is confirmed from the methods of experiment. The results of this papers can function as the recommendations for that R&D of little high-speed centrifugal compressors.