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本文以某燃料电池车用高速小型离心压缩机为研究对象,采用商业软件ANSYS CFX,分析了70000~100000r/min不同转速下,从阻塞到喘振流量范围内,低稠度扩压器叶片安装角分别为10°、15°、20°、25°时,离心压缩机的级性能变化,并与无叶扩压器进行对比。数值结果显示,低稠度扩压器提高了静压恢复系数,扩压器内径向方向和叶高方向减速均匀,流动损失小。可调安装角的低稠度扩压器可在各转速下较无叶扩压器提高约8%的流量范围,并且能在各工况提高至少压缩机4%的压比及等熵效率。通过分析各工况下压缩机比转速、扩压器进口冲角和叶片安装角之间的关系,基于响应面模型给出进口冲角和叶片安装角相对比转速的多项式,为可调低稠度扩压器的实际应用提供研究基础。
In this paper, a small high-speed small centrifugal compressor for fuel cell vehicles was taken as the research object. The commercial software ANSYS CFX was used to analyze the installation angles of the low-consistency diffuser vanes at different rotational speeds of 70000 ~ 100000r / min, Respectively, when the centrifugal compressor performance changes of 10 °, 15 °, 20 °, 25 °, compared with the non-leaf diffuser. The numerical results show that the low-consistency diffuser increases the coefficient of static pressure recovery. The diffuser has uniform decelerating rate in the radial direction and in the leaf height direction, and the flow loss is small. The low profile diffuser with adjustable mounting angles increases flow range by approximately 8% over non-leaf diffusers at all speeds and increases at least 4% compressor pressure ratio and isentropic efficiency at all operating conditions. By analyzing the relationship between specific speed of compressor, inlet angle of diffuser and mounting angle of blade, the polynomial of inlet angle of attack and relative rotational speed of blade mounting angle is given based on response surface model, which is adjustable low consistency The practical application of diffuser provides the basis for the study.