High Reynolds number turbulent wind tunnel boundary layer wall-shear stress sensor
High Reynolds number turbulent wind tunnel boundary layer wall-shear stress sensor
复制标题
DOI：
10.1080/14685240902953798
复制
发表时间：
2009-01
影响因子：
1.9
通讯作者：
S. Große;W. Schröder
中科院分区：
文献类型：
--
作者：
S. Große;W. Schröder
利用微柱剪应力传感器MPS3测量了高雷诺数ReΘ=11,400时湍流零压力梯度风洞边界层中的脉动壁面剪应力。传感器的概念已经成功地应用于液体流体流动，其中传感器具有低通滤波特性。当湍流频率大于结构的阻尼特征频时，低通滤波特性是有利的。然而，由于传感器结构的动态传递函数由于低阻尼而表现出强烈的共振，因此在空气中的应用是至关重要的。目前的结果表明，只要湍流壁面剪应力波动的频率低于衰减的特征频率，即使是共振传感器结构也可以用来精确地估计脉动壁面剪应力，例如在湍流风洞边界层中。
The fluctuating wall-shear stress in a turbulent zero-pressure gradient wind tunnel boundary layer at high Reynolds numbers up to Re Θ = 11,400 is determined by the micro-pillar shear-stress sensor MPS3. The sensor concept has already successfully been applied to liquid fluid flows, where the sensor shows low-pass filter characteristics. The low-pass filter characteristic is favorable especially when turbulent frequencies larger than the damped eigenfrequency of the structure occur. The application in air, however, is critical since the dynamic transfer function of the sensor structures exhibits a strong resonance due to low damping. The current results demonstrate that as long as frequencies of turbulent wall-shear stress fluctuations are below the damped eigenfrequency even a resonant sensor structure can be used to accurately assess the fluctuating wall-shear stress, e.g., in turbulent wind tunnel boundary layers.