Air supply systems are crucial subsystems in proton exchange membrane (PEM) fuel cell systems. Compressors are the key devices of air provide techniques that greatly impact the qualities of fuel cells. The simulation and experimental studies on a little centrifugal compressor with high rotation speed have already been presented in this paper. First of all, the input guidelines of membrane compressor are obtained based on the output power and working stress of PEM energy cellular material. Then, a prototype of little centrifugal compressors applied in PEM energy cells is made, simulated with the computational fluid dynamics (CFD) technique, and tested in actual working conditions. Lastly, the simulator results show that this internal flow in compressors affects the overall performance highly. The discharge pressure in the simulator is close towards the test data in the studied operating problems, and the maximum error is less than 6Percent.
Nowadays, power and environmental problems have highly attracted the attention of experts in these fields. Various clear energy systems have already been proposed and studied. As one extremely effective and clear power technology, the polymer electrolyte membrane (PEM) energy cell has become studied in recent years. The significant applications of PEM fuel cells give attention to transportation, distributed/stationary, and portable energy generation.1 And the PEM energy cell becomes by far the most appealing choice for power generation nowadays.2
The air provide system is one from the vital subsystems in PEM energy cell techniques.3 The air provide system qualities come with an important effect on the overall performance of PEM energy cell systems. Manage methods and also the effect on the energy cell production of the air supply system were researched.4-7 In air provide systems, compressors would be the key gadgets that considerably change the air supply system and also the qualities of energy cells.
Based on their operating concepts, two types of compressors can be utilized within the PEM fuel cells, that is, positive displacement compressor and dynamic compressor.
For positive displacement compressors, screw and scroll compressors were primarily selected and looked into in the PEM fuel cell system. Taking into consideration the operating atmosphere requirements of PEM energy cellular material, the compressed air needs to be oil-totally free or with water. Hence, the oil-totally free and water-administered screw compressor was researched for use in a 50 kW PEM energy cell system.8, 9 The isentropic efficiency from the prototype compressor is 55Percent, having a release pressure of .2 MPa along with a speed of 9000 rpm. The water-injected browse compressor was researched for any 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 performance of oxygen compressor. The results show the optimum system working stress is all about 1.2 atm machine. The pressure of air can be increased approximately 2 club easily by screw and scroll compressors. However the rotation velocity from the attach and browse compressors should not be extremely high (generally lower than ten thousand rpm), which leads to the big volume and weight. Hence, they are certainly not ideal for mobile phones very well.
As powerful compressors, centrifugal compressors are most likely best suited for PEM energy cellular material since they have such qualities as high speed (corresponding towards the smaller sized volume and lighter weight), low noise, higher effectiveness, and dependability. Therefore, numerous researchers have studied centrifugal compressors in different aspects.
Many investigators target the operation of centrifugal compressors in energy cell techniques to improve the efficiency of PEM energy cells and the stability of centrifugal compressors. Empirical models14, 15 of centrifugal compressors were launched, and the available designs had been assessed with the experimental information. The dynamic model of a centrifugal compressor competent at system simulator inside the virtual analyzed computational atmosphere was introduced,16 which included different compressor deficits. And it also can be applied to almost any centrifugal compressor and energy cell system. A semi-mechanised and semi-imperial air provide system model based on centrifugal air compressors was established for any 150 kW PEM fuel cell motor.3, 5 Experimental and simulator results show the air provide system has good precision and celerity for your air compressor control. A car fuel cell system using a two-phase turbo-compressor for air provide was researched, as well as the results show that a two-phase turbo-compressor with a turbo-expander can significantly impact general system energy and effectiveness.17 Hu et al.18, 19 analyzed the optimisation of velocity reaction of air compressor for hydrogen fuel cell car taking into consideration the transient current. And a new speed regulation manage technique (the transient current injection control technique) was proposed.
Surge and stall are the vital qualities of the centrifugal compressor.20, 21 Azizi et al.22 studied the stall/surge of the multi-phase compressor within a crossbreed solid oxide fuel cell-gasoline turbine system. The results show that the compressor provides a sustained air stream price through the moderate stall/surge occasion. Godard et al.23 analyzed the rise characterization of a centrifugal compressor for energy cell, as well as the compressor surges abruptly with no pre-stall exercise at a high rotation velocity. An agglomerate design is launched, and a energy cell system model such as a powerful compressor is applied. The outcomes indicate that this o2 concentration is most highly affected by the surge development of the compressor.24 Laghrouche et al.25 proposed a load governor based upon constrained extremum looking for PEM energy cell o2 hunger and compressor rise protection, and also the scheme was verified by try things out. A fuzzy reasoning manage solution was proposed for the compressor group providing an embedded 5 kW PEM energy cell system.
Several studies target the design, performance optimization, and new bearings of oxygen generator. A nonlinear autoregressive moving average with exogenous inputs model to have an air compressor of PEMFC system was recognized,26 and contains a tiny fitted error. Wan et al.14 investigated the improved empirical guidelines design technique for iugjby compressors in PEM energy cell car applications. As well as the water-lubricated bearing for top-velocity centrifugal compressors was studied by Ren et al..27, 28 The performance of centrifugal compressors for any fuel cell was enhanced using aerodynamic optimisation and data mining techniques.29
A number of these research on centrifugal compressors found in PEM fuel cellular material are concerned using the working overall performance and control ways of centrifugal compressors in PEM energy cell techniques. This study presents the structural guidelines of a little high-velocity centrifugal compressor for PEM fuel cellular material, as well as the primary aspects impacting the performance of compressors are discussed. The performance of a compressor is assessed by the CFD technique. In fact it is confirmed by the methods of try things out. The final results of the paper can become the references for the RAndD of little higher-speed centrifugal compressors.