Air supply systems are crucial subsystems in proton exchange membrane (PEM) fuel cell systems. Compressors are the key gadgets of air supply techniques that greatly influence the characteristics of fuel cells. The simulator and experimental researches on a little centrifugal compressor with high rotation velocity have been introduced in this paper. First of all, the input guidelines of hydrogen compressor are obtained in accordance with the productivity power and operating stress of PEM fuel cells. Then, a prototype of little centrifugal compressors applied in PEM energy cells is designed, simulated with the computational fluid dynamics (CFD) method, and analyzed in real working conditions. Lastly, the simulator results show the internal stream in compressors impacts the overall performance highly. The release stress in the simulation is close towards the check data in the studied operating conditions, as well as the maximum error is less than 6%.
Nowadays, power and ecological problems have strongly attracted the interest of researchers in these areas. Various clean power systems happen to be proposed and analyzed. As one extremely efficient and clean power technologies, the polymer electrolyte membrane layer (PEM) energy cell continues to be analyzed recently. The significant applications of PEM fuel cellular material concentrate on transportation, dispersed/stationary, and portable energy era.1 As well as the PEM energy cell will become by far the most appealing option for energy era in the 21st century.2
The air supply system is one from the vital subsystems in PEM fuel cell systems.3 The air supply system qualities have an important effect on the overall performance of PEM energy cell systems. Manage methods and also the effect on the energy cell output of the air supply system were investigated.4-7 In air provide systems, compressors would be the key devices that considerably change the air supply system as well as the characteristics of fuel cells.
Based upon their operating principles, two kinds of compressors can be utilized inside the PEM fuel cells, which 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 specifications of PEM fuel cellular material, the compressed air needs to be oil-totally free or with water. Therefore, the oil-free and water-administered attach compressor was investigated to be used within a 50 kW PEM fuel cell system.8, 9 The isentropic effectiveness of the prototype compressor is 55%, having a discharge stress of .2 MPa as well as a velocity of 9000 rpm. The water-administered scroll compressor was researched for a 30 kW PEM fuel cell with 5000 rpm.10-12 Qin et al.13 investigated the operating stress effect on the overall performance of any 20 kW PEM fuel cell system depending on the experimental overall performance of oxygen compressor. The final results show the ideal system working stress is all about 1.2 atm machine. Pressure of air can be improved approximately 2 bar effortlessly by screw and browse compressors. However the rotation speed of the screw and scroll compressors should not be very high (generally lower than 10,000 rpm), which leads for the large volume and weight. Hence, they are certainly not appropriate for cellular devices very well.
As powerful compressors, centrifugal compressors are most likely best suited for PEM fuel cells simply because they have this kind of characteristics as high-speed (related to the smaller sized volume and lighter weight), reduced noise, higher effectiveness, and reliability. Hence, numerous scientific study has studied centrifugal compressors in various aspects.
Numerous researchers concentrate on the procedure of centrifugal compressors in energy cell techniques to enhance the efficiency of PEM energy cellular material and also the balance of centrifugal compressors. Empirical models14, 15 of centrifugal compressors were launched, and the readily available models were assessed using the experimental information. The powerful type of a centrifugal compressor able to system simulation in the digital analyzed computational environment was presented,16 which provided various compressor deficits. And it can be used to almost any centrifugal compressor and fuel cell system. A semi-mechanised and semi-imperial air provide system design according to centrifugal air compressors was established for any 150 kW PEM energy cell motor.3, 5 Experimental and simulator outcomes show that the air supply system has good precision and celerity for the air compressor manage. A vehicle energy cell system using a two-phase turbo-compressor for air supply was investigated, and also the outcomes show which a two-phase turbo-compressor with a turbo-expander can significantly affect general system power and effectiveness.17 Hu et al.18, 19 studied the optimization of speed reaction of air compressor for hydrogen energy cell car taking into consideration the transient current. Along with a new velocity legislation manage technique (the transient current shot control technique) was proposed.
Surge and stall are definitely the vital characteristics from the centrifugal compressor.20, 21 Azizi et al.22 studied the stall/rise of the multi-stage compressor inside a hybrid strong oxide energy cell-gas turbine system. The results show that the compressor supplies a suffered air flow price throughout the moderate stall/surge event. Godard et al.23 analyzed the rise characterization of any centrifugal compressor for energy cell, as well as the compressor surges suddenly without pre-stall activity in a high rotation velocity. An agglomerate model is introduced, and a fuel cell system model such as a powerful compressor is implemented. The final results suggest the oxygen focus is most strongly affected by the surge development in the compressor.24 Laghrouche et al.25 recommended a load governor based on constrained extremum seeking PEM fuel cell oxygen starvation and compressor surge safety, and also the scheme was confirmed by experiment. A fuzzy logic manage solution was proposed for your compressor team providing an embedded 5 kW PEM fuel cell system.
Several studies concentrate on the style, performance optimization, and new bearings of oxygen generator. A nonlinear autoregressive moving average with exogenous inputs model for an air compressor of PEMFC system was established,26 and features a tiny fitting error. Wan et al.14 researched the improved empirical parameters design method for iugjby compressors in PEM fuel cell car programs. And the water-moisturized bearing for high-speed centrifugal compressors was studied by Ren et al..27, 28 The performance of centrifugal compressors for any energy cell was improved using aerodynamic optimisation and information mining methods.29
Most of these studies on centrifugal compressors used in PEM energy cells are worried with all the working overall performance and control strategies for centrifugal compressors in PEM energy cell systems. This study provides the structural guidelines of a little high-speed centrifugal compressor for PEM fuel cells, and the main aspects affecting the performance of compressors are discussed. The overall performance of the compressor is evaluated by the CFD technique. In fact it is verified by the strategies for try things out. The final results with this papers can become the references for that R&D of little higher-speed centrifugal compressors.