EFFECTS OF PERIODIC WAKES AND FREESTREAM TURBULENCE ON COHERENT STRUCTURES IN LOW-PRESSURE TURBINE BOUNDARY LAYER

被引：0

作者：

Zhang, Weihao ^{[1
]}

Zou, Zhengping ^{[1
]}

Zhou, Kun ^{[1
]}

Liu, Huoxing ^{[1
]}

Ye, Jian ^{[2
]}

机构：

[1] Beihang Univ, Sch Jet Prop, Natl Key Lab Sci & Technol Aeroengines, Beijing 100191, Peoples R China

[2] Chongqing Univ Chongqing, Coll Power Engn, Chongqing 400030, Peoples R China

来源：

PROCEEDINGS OF THE ASME TURBO EXPO 2012, VOL 8, PTS A-C | 2012年

基金：

高等学校博士学科点专项科研基金;

关键词：

LARGE-EDDY SIMULATION; HIGH-LIFT; SEPARATION-BUBBLES; SELF-SIMILARITY; TRANSITION; FLOW; SCHEMES;

D O I：

暂无

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

The effects of periodic wakes and inlet freestream turbulence intensity (FSTI) on coherent structures in the boundary layer of a high-lift low-pressure turbine cascade are studied in this paper. Large-eddy simulations (LES) are performed on T106D-EIZ profile at Reynolds number (Re) of 60,154 (based on the chord and outflow velocity). Eight cases, considering FSTI of 0, 2.5%, 5% and 10% as well as the wake reduced frequency (f(r)) of 0.67, 1.34 and 0.335, are conducted and discussed. The results show that the open separation could be compressed by freestream turbulence to a small extent, whereas, it could be replaced by separation bubbles under wake conditions. Stripe structures and turbulence spots appear in shear layer over the separation bubbles. The increments of wake frequency or FSTI can accelerate the transition progress which result in shorter separation bubbles, meanwhile, emphasize the turbulence spots.

引用

页码：1335 / +

页数：3

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