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首页> 外文期刊>Experiments in Fluids: Experimental Methods and Their Applications to Fluid Flow >Diagnostics of the fluctuating wall shear rate components using an uncalibrated three-segment electrodiffusion sensor
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Diagnostics of the fluctuating wall shear rate components using an uncalibrated three-segment electrodiffusion sensor

机译：使用未校准的三段电扩展传感器诊断波动壁剪切速率分量的诊断

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摘要

An inverse problem is used to significantly improve the frequency response of a three-segment electrodiffusion (ED) sensor subjected to strong inertial effects in high-amplitude unsteady flows. It is shown that the fluctuating component of the wall shear rate's magnitude and direction can be accurately determined when both variables exhibit simultaneous large-amplitude variations, even when using an uncalibrated probe. Measurements are performed in the vicinity of a rotating cylinder in motion in a highly viscous fluid with poor electrochemical diffusivity, thus establishing a harsh environment for an ED sensor. Results using the inverse problem showed strong concordance with PIV complementary measurements in most cases and further expose the potential of this non-intrusive technique for thorough wall shear stress diagnostics.
机译：逆问题用于显着改善经过高幅度不稳定流动的强度惯性效应的三段电扩展（ED）传感器的频率响应。 结果表明，当两个变量表现出同时大振幅变化时，可以精确地确定壁剪切速率的幅度和方向的波动分量，即使在使用未校准的探针时也能够精确地确定。 在具有差的电化学扩散率的高度粘性流体中，在旋转圆筒的旋转圆筒附近进行测量，从而为ED传感器建立恶劣环境。 在大多数情况下，使用逆问题的结果表明，在大多数情况下，PIV互补测量的强大一致性，并且进一步暴露了这种非侵入性技术的潜力，用于彻底墙剪应力诊断。

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