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设计了普通高速(20 000 r.min-1)电机驱动的车载燃料电池低比转速离心压气机。总结了压气机设计特点,并利用三维数值模拟计算(CFD)技术初步研究了压气机叶轮内部流场,得到了相应的特性曲线与主要气动参数分布。根据数值模拟分析,所设计的车载燃料电池低比转速离心压气机具有较高的效率和较宽广且平坦的工作特性,叶轮在设计转速下最高效率达83%,最高压比达1.6,流量范围在0.05~0.20 kg.s-1。所设计的低比转速离心压气机,能满足车载燃料电池空气系统对于压气机的要求,同时避免了采用高比转速离心压气机所需的超高速电机所带来的问题。
A common high speed (20 000 r.min-1) motor-driven low specific speed centrifugal compressor for vehicle fuel cells was designed. The design features of the compressor were summarized. The flow field inside the compressor impeller was studied by using the three-dimensional numerical simulation (CFD) technique. The corresponding characteristic curves and the distribution of the main aerodynamic parameters were obtained. According to the numerical simulation, the design of low specific speed centrifugal compressor for vehicle fuel cell has high efficiency and wide and flat working characteristics. The maximum efficiency of impeller at design speed is up to 83% and the maximum pressure ratio reaches 1.6. The flow range At 0.05 to 0.20 kg.s-1. The low specific speed centrifugal compressor designed to meet the requirements of air compressors for vehicle fuel cell air systems while avoiding the problems associated with ultra-high speed motors for use with high specific speed centrifugal compressors.