不同长度端壁翼刀对压气机叶栅二次流影响的数值研究
The Influence of Endwall Wing Fence Length on Secondary Flow in Compressor Cascade
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摘要: 对可控扩散叶型(CDA)常规直叶栅和三种具有不同长度和流向位置的端壁翼刀叶栅内的三维粘性流场进行了数值模拟。结果表明,不同长度端壁翼刀都不同程度上改善了栅内的气流流动状况;较小长度的翼刀所产生的附加损失也较小;反向翼刀涡的产生与流道内横向流动的强弱息息相关。计算结果表明,占据前3/4流道长的翼刀为最佳翼刀。Abstract: The numerical simulation has been carried out to investigate the influence of the endwall wing fence with different length on the secondary flow in compressor cascade.The results show that the boundary layer fences can reduce the strong cross-flow in cascade near the endwall.The additional energy loss of long-fence is larger than that of short-fence.A counter-rotating streamwise vortex was found over the fence and the strength is closely related to the strength of the crossflow.The numerical results show that the influence on secondary flow is most effective when the fences are located in the foreside of the passage with a length of 75 percent axial chord.
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Key words:
- aerospace propulsion system /
- compressor cascade /
- wing fence /
- secondary flow /
- additional energy loss
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