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Performance Improvement of a Centrifugal Compressor for the Fuel Cell Vehicle by Tip Leakage Vortex Control

Journal of Thermal Science 2021年第6期30卷 2099-2111页

作者： CHEN Haoxiang ZHUGE Weilin ZHANG Yangjun MA Xuelong TAO Lin State Key Laboratory of Automotive Safety and Energy Tsinghua UniversityBeijing 100084China Weichai Power Co. Ltd.Weifang 261061China Xecaturbo(Shanghai)Technology Co. Ltd.Shanghai 200241China

Heightened interests have been laid at the preliminary design and optimization of the centrifugal compressor for the fuel cell *** centrifugal compressor for fuel cell vehicle is driven by a high-speed motor;however,the limit of the motor speed makes the flow passage of the impeller long and narrow,which leads to a serious tip leakage *** tip leakage loss deteriorates the compressor *** this paper,3-D numerical simulations were carried out with the aim of investigating the tip leakage loss in a prototype centrifugal compressor for a 100 kW fuel cell *** results revealed that the mixing loss caused by the interaction between the tip leakage vortex and the downstream tip leakage flow contributed to the major part of the tip leakage *** path of the tip leakage vortex almost followed the streamwise direction,while the downstream tip leakage flow exhibited strong circumferential momentum,which referred to the fact that they were nearly ***,a flow control approach,which was realized by enhancing the blade loading around the leading edge of blade tips in this paper,was proposed to decrease the interaction angle between the tip leakage vortex and the downstream tip leakage flow and then mitigate mixing loss by changing the flow direction of the tip leakage *** results showed a smaller interaction angle was achieved in the optimized impeller compared with the baseline ***,the efficiency was also improved by 1.30%at design condition and the maximum efficiency improvement could be up to 10%at large mass flow condition of 92000 r/*** manufactured and tested,the optimized compressor was proved to achieve an isentropic efficiency of 75.84%at design condition.

关键词： centrifugal compressor fuel cell vehicle efficiency improvement tip leakage vortex mixing loss

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