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The relation between the coherent structure detected using wall shear stress fluctuations and wall shear stress distribution: 1st report (ejection event case)

机译:使用墙面剪切应力波动检测的相干结构与墙面剪切应力分布的关系:第1报告(弹出事件情况)

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摘要

In order to clarify experimentally the relation between wall shear stress fluctuations and near wall flow field when ejection events occur, three velocity components and wall shear stress are measured simultaneously using laser doppler velocimeter and using the flush-mounted hot film probe. Time-variation of ensemble averaged flow fields when ejection events occur is examined. Also time-variation of ensemble averaged wall shear stress distributions is examined by simultaneous measurements of streamwise velocity in the viscous sublayer and wall shear stress. Consequently, it is clarified that ejection events detected using wall shear stress fluctuations are induced by the counter rotating streamwise longitudinal vortices and change of the wall shear stress distribution is closely related to the passage of streamwise longitudinal vortices.
机译:为了通过实验阐明壁剪切应力波动和靠近壁流场之间的关系,当出现喷射事件时,使用激光多普勒速度计同时测量三个速度分量和壁剪切应力,并使用嵌合安装的热膜探针。 检查Ensemble平均流场的时间变化被检查发生喷射事件时。 同时通过同时测量粘性子层和壁剪切应力的流动速度的同时测量来检查集合平均壁剪切应力分布的时间变化。 因此,阐明了使用壁剪切应力波动检测的喷射事件由计数器旋转流动纵向涡流引起,并且壁剪切应力分布的变化与流动纵向涡流的通道密切相关。

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