高压离心压气机导叶流场的附面层抽吸控制研究

Study about flow field control of vane of HP centrifugal compressor by boundary layer suction

关键词:  离心压气机  分离流动+  附面层抽吸+  拓扑分析+

Key words:  Centrifugal compressor  Flow separation+  Boundary layer suction+  Topology analysis+

摘要:

通过数值模拟研究了某小型涡扇发动机离心压气机的出口导叶流场特点,结合拓扑分析方法讨论了附面层抽吸对叶栅性能的影响。结果表明:原型叶栅由于展弦比较小,流动空间狭窄,各种形式的附面层分离相互掺混,恶化了整个叶栅的流动。通过附面层抽吸可以改变叶栅内的分离结构,明显减小吸力面的分离,使得流场结构趋于简单,从而减小损失、提高叶栅效率。

Abstract:

A numerical study was carried out for a exit guide vane of a certain centrifugal compressor with high turning angle and meridional divergence.By topology analysis,the effect of boundary layer suction on cascade performance was discussed.The numerical results showed that the original low aspect ratio cascade had a narrow flow space and thus led to strong mixing of different boundary layer separations.By applying boundary layer suction,the separation structure and area were effectively changed and flow structure was simplified.The loss of cascade was remarkably reduced and the efficiency was raised.