动态共振剪应力传感器概念研究

Study of New Dynamic Resonant Shear Stress Sensor Concept

提出一种新的基于共振表面元的动态共振墙剪应力传感器概念,并且通过建立理论模型、数值模拟和实验验证进行了系统的研究。研究结果表明动态共振墙剪应力传感器概念能够精确测量低速流场的墙剪应力,而且可能用于壁面湍流流场的控制研究。实验设计了开环和闭环测量控制系统,用于测量动态共振墙剪应力传感器位移随墙剪应力的变化。实验结果表明随着平均墙剪应力的变化,动态共振墙剪应力传感器的共振表面元能够获得可以测到的位移信号。此外,实验结果也充分证明动态共振墙剪应力传感器概念完全可以测量墙剪应力,实验结果与所建立理论模型的数值模拟结果符合较好。

A new dynamic resonant wall shear stress sensor concept based on an oscillating sensor element operating near its structure resonant frequency was researched both numerically and experimentally. The experimental results of this study in wind tunnel showed that, with a change of the mean shear stress acting on the sensor surface, measurable sensor sensitivity in the oscillation amplitude occurs for both open loop and closed loop control system of the sensor. This is definitively experimental evidence that a resonant system can be made sensitive to wall shear stress and it suggests that the concept of a dynamic resonant wall shear stress sensor can work. Furthermore, these results agree with qualitatively the numerical simulation results in boundary layer flow and provide a rigorous basis upon which further development of the dynamic resonant sensor can be pursued.