Large Eddy Simulation for Control of Boundary Layer Separation with Dimples

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Large Eddy Simulation for Control of Boundary Layer Separation with Dimples

更新时间：2025-07-09

- Large Eddy Simulation for Control of Boundary Layer Separation with Dimples
- Vol. 44, Issue 9, Pages: 27-32(2010)
- 作者机构：
  
  西安交通大学能源与动力工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：
  CLC： V211.6
- Online First：10 September 2010，
  
  Published：2010
- 稿件说明：
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Large Eddy Simulation for Control of Boundary Layer Separation with Dimples[J]. 2010, 44(9): 27-32.
DOI：

Large Eddy Simulation for Control of Boundary Layer Separation with Dimples[J]. 2010, 44(9): 27-32. DOI：

摘要

用具有逆压梯度的平板分离流动模拟低压透平叶片吸力面的分离流动

采用基于动力Smagorinsky亚格子应力模型的大涡模拟对逆压梯度条件下布置在平板上单个球窝的流动特性及球窝对边界层分离流动控制的效果进行了研究

详细考察了球窝前沿边界层厚度和球窝深度的比值R分别为0.378、0.994和1.453时球窝的流动特性和控制性能.结果表明:R较小时控制性能最好; 球窝内部的马蹄涡对球窝的流动起主导作用; 球窝内的马蹄涡周期性脱落并在球窝尾迹区形成发夹涡排

发夹涡涡腿紧贴壁面形成流向涡

流向涡卷吸主流高能流体

由此增强了边界层能量.马蹄涡和发夹涡排对分离流动控制起主要作用.

Abstract

A flat plate separation flow with a diffusive upper wall was designed to simulate the boundary layer separation of a low pressure turbine cascade suction surface. Large eddy simulation with the dynamic Smagorinsky model was adopted to investigate flow dynamics and separation control effectiveness of a dimple under adverse pressure gradient on the flat plate. The effect of different ratio of leading edge boundary layer thickness to depth(R=0.378

0.994

1.453)on dimple flow dynamics and control effectiveness was investigated. The results show that the horseshoe vortex is the leading factor in the dimple flow dynamics for all three cases. Periodical shedding of the horseshoe vortex forms hairpin vortex lines arranged in dimple wake. The legs of the hairpin vortex are adjacent to the boundary layer and form streamwise vortex. In addition

the streamwise vortices absorb main stream high kinetic energy fluid into the boundary layer and augment the energy of the boundary layer. It appears that the horseshoe vortex and hairpin vortex lines are most effective to the suppression of boundary layer separation.

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Keywords

references

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