Interaction of Tip Clearance Flow and Three-Dimensional Separations in Axial Compressors
Interaction of Tip Clearance Flow and Three-Dimensional Separations in Axial Compressors
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DOI：
10.1115/1.2720876
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发表时间：
2007-10
影响因子：
1.7
通讯作者：
S. A. Gbadebo;N. Cumpsty;T. Hynes
中科院分区：
文献类型：
--
作者：
S. A. Gbadebo;N. Cumpsty;T. Hynes
本文研究了压气机叶栅角区叶顶间隙流动与三维分离的相互作用。采用10个叶尖间隙水平进行了三维数值计算，间隙范围从0到2.18%的叶片弦。叶片吸力面上的三维分离被间隙流消除，间隙约为弦长的0.58%。对于该叶栅，在零和1.7%弦叶尖间隙的实验结果被用来评估数值预测的有效性。去除机理与前缘马蹄涡的抑制和叶尖间隙流与端壁边界层的相互作用有关，端壁边界层在被驱动朝向叶片吸力面时发展成二次流。这种相互作用导致在端壁上形成新的3D分离线。分离线形成了卷起进入间隙涡的分离流面的底部。
This paper considers the interaction of tip clearance flow with three-dimensional (3D) separations in the corner region of a compressor cascade. Three-dimensional numerical computations were carried out using ten levels of tip clearance, ranging from zero to 2.18% of blade chord. The 3D separations on the blade suction surface were largely removed by the clearance flow for clearance about 0.58% of chord. For this cascade, experimental results at zero and 1.7% chord tip clearance were used to assess the validity of the numerical predictions. The removal mechanism was associated with the suppression of the leading edge horseshoe vortex and the interaction of tip clearance flow with the endwall boundary layer, which develops into a secondary flow as it is driven towards the blade suction surface. Such interaction leads to the formation of a new 3D separation line on the endwall. The separation line forms the base of a separated stream surface which rolls up into the clearance vortex.