渐缩式射流缝对静子叶栅流场性能影响的数值研究

Numerical analysis on the effects of stator cascade with convergent jet slot on flow performance

为降低压气机静子叶栅损失,设计了一种渐缩式射流缝叶栅,并对渐缩式射流缝与等截面积平行式射流缝对叶栅流场的影响进行了对比研究。利用商业软件NUMECA对静子叶栅在不同来流马赫数和不同进气攻角下的流场进行数值模拟,得到了渐缩式与平行式射流缝对叶栅通道总压损失、流场结构以及尾迹的影响。结果表明,来流0°攻角和-5°攻角时,渐缩式射流缝总压损失小于平行式射流缝总压损失;来流15°攻角时,两种射流缝结构总压损失明显降低,叶栅通道出口各参数也趋向均匀。渐缩式射流缝结构能够进一步提高射流速度,在来流大攻角的情况下可有效改善叶栅流场性能。

In order to reduce the loss of compressor stator cascade,a convergent jet slot was designed and the effects on the flow filed of cascade with convergent jet slot and parallel slot were compared.The flow field of cascade under different Mach number and incidence angles was predicted by NUMECA.The effects on total pressure loss,flow field structure and wake of cascade with convergent jet slot and parallel slot were analyzed.Results showed that the total pressure loss of cascade with convergent slot was less than that of cascade with parallel slot at 0°and-5°incidence angle;the total pressure loss was reduced obviously at 15°incidence angle for both cascades with slot,and parameters of cascade outlet tended to be uniform.The speed of jet flow can be further improved by the convergent jet slot,and performance of the cascade can be effectively improved at large incidence angles.