Abstract

A new method of visualization of the flow-velocity fields within a boundary layer of a nonisothermal fluid using seedless velocimetry is proposed. The method is based on the high-speed thermographic detection of the dynamics of temperature inhomogeneities acting as a passive flow tracer through an infrared-transparent wall. As a result of thermal image post-processing using a cross-correlation algorithm, the fields of velocity of near-wall flow formed in the region of interaction between the submerged impinging water jet and the impinged surface are investigated in the range from 0 to 1 m/s, and the location of the laminar–turbulent transition inside the boundary layer are determined.

中文翻译：

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基于高速热成像的流体边界层速度场测量

摘要

提出了一种利用无籽测速技术可视化非等温流体边界层内流速场的新方法。该方法基于对通过红外透明壁充当被动流动示踪剂的温度不均匀性动力学的高速热成像检测。作为使用互相关算法进行热图像后处理的结果，研究了在浸没式水射流与被撞击表面之间的相互作用区域中形成的近壁流速度场，范围为0到1 m / s，并确定边界层内层流-湍流过渡的位置。