针对高负荷氦气压气机中角区分离、叶顶泄漏严重带来的效率损失问题，以单级氦气压缩机为研究对象，利用CFD方法，分析了不同弯曲角度下氦气压气机内部的角区损失和叶顶泄漏损失，并优化了现有五级轴流氦气压气机。结果表明：叶片正弯会增加端区处的静压，减少角区分离，进而降低角区损失；对动叶而言，在设计攻角下正弯也会增加前缘损失；动叶叶顶反弯使泄漏流远离下一个叶片的压力面，而合适的反弯角度可以降低叶顶泄漏量；选取合适的弯曲角度使五级轴流压气机设计点效率提高1.85%。

Aiming at efficiency loss caused by corner seperation and tip leakage in high load helium compressor, the singlestage helium compressor was taken as the research object, and the corner loss and tip leakage loss of helium compressor under different bowed angles were analyzed by using CFD method, and the existing fivestage axial helium compressor was optimized. The results show that positive curve of blades will increase the static pressure at the end wall, reduce corner separation, and thus reduce corner loss; for rotor blades, positive curve of blades will also increase the leading edge loss at the design angle of attack; the tip negatively curved blade makes the leakage flow far away from the pressure surface of the next blade, and appropriate one can reduce the mass flow of tip leakage; a suitable curved blade is selected to increase efficiency at design point of fivestage axial compressor by 1.85%.

TK14

中国科学院洁净能源先导科技专项（XDA21000000）