Piezoelectric bimorph bending sensor for shear-stress measurement in fluid flow
Piezoelectric bimorph bending sensor for shear-stress measurement in fluid flow
复制标题
用于流体流动剪切应力测量的压电双压电晶片弯曲传感器
DOI：
10.1016/s0924-4247(97)80072-6
复制
发表时间：
1996
影响因子：
4.6
通讯作者：
C. Audoly
中科院分区：
文献类型：
--
作者：
D. Roche;C. Richard;L. Eyraud;C. Audoly
边界层产生的剪切应力的测量是流体动力学的一个基本问题。了解平均剪切应力及其波动可以更好地描述边界层并更好地理解流动噪声耦合。在层流或湍流中测量的剪切应力仅为几个帕斯卡。通常类型的压电力传感器不能以令人满意的精度执行这种测量。所提出的传感器执行剪切应力的直接测量。它由多个压电双压电晶片组成，可将非常低的力转换为大量的电荷。典型的器件灵敏度为 200 nC N−1。对几平方厘米表面上的剪应力进行积分，可以测量低至 1 Pa 的剪应力。
The measurement of shear stresses developed by a boundary layer is a fundamental problem of fluid dynamics. Knowing the mean shear stress and its fluctuations leads to a better description of the boundary layer and a better understanding of flow noise coupling. The shear stresses to be measured in a laminar or a turbulent flow amount to only a few pascal. The usual types of piezoelectric force sensors cannot perform this measurement with a satisfactory accuracy. The proposed sensor performs a direct measurement of shear stresses. It is composed of several piezoelectric bimorphs, which convert a very low force into a large amount of electrical charge. The typical device sensitivity is 200 nC N−1. Integrating the shear stresses on a surface of a few square centimetres allows shear stresses to be measured down to 1 Pa.