B-8 主流乱れを伴う低圧タービン翼流れにおける剥離泡のLES(空力I,一般講演)

概要

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In this paper, LES has been performed to simulate a flow in the T106 LP turbine cascade. A free-stream turbulence was introduced in the calculation to investigate its effects on the transition process of a separated shear layer in the turbine. The computational results are compared with the experiment in terms of characteristics of a laminar separation bubble on the blade suction surface. The simulations have predicted delayed transition in the separated shear layer and overestimated the size of the separation bubble. The simulations showed that Kelvin-Helmholtz instability is a trigger to the roll up of the separated shear layer and the free-stream turbulence accelerates the transition in the separated shear layer.
公益社団法人日本ガスタービン学会の論文
2007-09-01