叶片前掠对低比转速离心压气机性能的影响

摘要

研究了低比转速离心压气机叶片前掠流动控制效果,以促进其在车用电动增压器上的应用.建立了某车用燃料电池用低比转速离心压气机三维仿真模型,研究了叶片前缘前掠对低比转速离心压气机性能的影响及其流动机理.结果表明,该叶片前缘掠角20° 的低比转速压气机与无前缘掠角压气机相比,压比、效率和稳定工作范围均无明显变化;前掠降低了大叶片前端的载荷,叶尖泄漏减弱,而大叶片后端流动状况没有明显改变.为提高叶片前掠的流动控制作用,要进一步优化叶片中弧线角度分布,改善前掠叶片的负荷分布.%The forward-swept blade flow control method on low specific speed centrifugal compressor was studied to promote the application of vehicle electric supercharger. Three dimensional simulation model of low specific speed centrifugal compressor was established. The performance and the flow mechanism of centrifugal compressor with forward-swept blade was clarified . The results show that the pressure ratio, efficiency and stable working range of the forward-swept angle of 20° and original compressor are of little difference; the leaf tip load and leakage flow of the front part of the forward-swept compressor main blade reduce, while there is no significant improvement of flow condition at back end of the main blade. The distribution of arc angle of the main blade should be optimized of the centrifugal compressor with forward-swept blade to improve the performance.