FLOW SEPARATION CHARACTERISATION OF A FORWARD FACING STEP IMMERSED IN A TURBULENT BOUNDARY LAYER

FLOW SEPARATION CHARACTERISATION OF A FORWARD FACING STEP IMMERSED IN A TURBULENT BOUNDARY LAYER
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浸没在湍流边界层中的前向台阶的流动分离特性

DOI：
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发表时间：
2009
期刊：
Proceeding of Sixth International Symposium on Turbulence and Shear Flow Phenomena
影响因子：
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通讯作者：
I. Marusic
I. Marusic
中科院分区：
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文献类型：
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作者：
M. Sherry;D. L. Jacono;J. Sheridan;R. Mathis;I. Marusic

文献摘要

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流动分离实验进行了两个设施，使用粒子图像测速（PIV）和压力脉动在一个宽的雷诺数范围内的前向步骤沉浸在湍流边界层。在模型前缘固定分离点的情况下，观察到了海崖体流动。在整个雷诺数范围内使用PIV技术的回流区尺寸的特点。压力分布图提供了对回流区表面压力分布的了解。影响再附着距离XL的机制，即边界层内的湍流混合和边界层中的速度赤字进行了评论。
Flow separation experiments are conducted in two facilities using particle image velocimetry (PIV) and pressure tappings over a wide Reynolds number range for a forward facing step immersed in a turbulent boundary layer. Bluff body flow is observed with the fixed separation point located at the leading edge of the model. The recirculation region dimensions are characterised over the entire Reynolds number range using the PIV technique. Pressure tappings provide insight into the surface pressure distribution in a recirculation region. The mechanisms affecting the reattachment distance, XL, namely the turbulent mixing within the boundary layer and the velocity deficit in the boundary layer are commented on.