The transition mechanism of highly loaded low-pressure turbine blades

被引：106
|
作者：
Stieger, RD [1 ]
Hodson, HP [1 ]
机构：
[1] Univ Cambridge, Dept Engn, Whittle Lab, Cambridge CB3 0DY, England
来源：
JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME | 2004年 / 126卷 / 04期
关键词：
D O I：
10.1115/1.1773850
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
A detailed experimental investigation was conducted into the interaction of a convected wake and a separation bubble on the rear suction surface of a highly loaded low-pressure (LP) turbine blade. Boundary layer measurements, made with 2D LDA, revealed anew transition mechanism resulting from this interaction. Prior to the arrival of the wake, the boundary layer profiles in the separation region are inflexional. The perturbation of the separated shear layer caused by the convecting wake causes an inviscid Kelvin-Helmholtz rollup of the shear layer. This results in the breakdown of the laminar shear layer and a rapid wake-induced transition in the separated shear layer.
引用
收藏
页码：536 / 543
页数：8
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