本文以某一离心压缩机中的自由曲面叶轮为研究对象,将其“直纹面化”以降低制造成本.研究对比了自由曲面叶轮与直纹面化叶轮的气动性能差异,并在叶片表面施加沿流向的流向微槽,分析其对叶轮气动性能的影响.研究表明,流向微槽对压比和效率均有明显的提升作用,但对稳定运行范围没有影响.施加适当的微槽方案可有效提升直纹面叶轮的气动性能,使之接近原自由曲面叶轮,从而获得兼顾气动性能及加工成本的高性能三元叶轮.“,”In the paper the freeform blade surface of an centrifugal impeller is replaced by a ruled surface for the purpose of reducing the manufacture cost.It is found that the impeller with a ruled surface leads to the obvious deteriorations on the aerodynamic performance and flow field.Then a streamwise micro-grroove is adopted on the ruled surface impeller and its effect on the impeller performance is analyzed.The results indicate that,the streamwise micro-groove can increase the pressure ratio and efficiency evidently,while it has no effect on the stable operating range of impeller.Furthermore,the performance of a ruled surface impeller can reach to almost the same level with that of a freeform surface impeller when an appropriate micro-groove design is used.