水下平板壁面剪应力MEMS测量研究进展

围绕水下平板壁面剪应力测量进行了一系列的试验测试研究工作，包括MEMS壁面剪应力传感器标定、平板模型设计、微弱信号测量系统开发、平板边界层参数估计与CFD仿真分析以及近壁面速度剖面LDV测量等。对于速度为0.2~0.7m/s的来流，基于MEMS传感器阵列对水下壁面剪应力进行了测量，同时使用LDV进行速度剖面测量，并通过对速度剖面的拟合求解出平均壁面剪应力值。通过比较可知，MEMS测量结果、LDV速度剖面法拟合结果和经验公式计算结果三者一致性较好，相互之间差别在5%以内。

Research on underwater flat plate wall shear stress measurement with MEMS sensors array

Aiming at underwater wall shear stress measurement, researches have been conducted which include MEMS wall shear stress sensors calibration, flat plate model design, weak signal detection system development, flat plate boundary parameter estimation and CFD analysis, and near-wall LDV boundary layer profile measurement. The local free stream velocities ranging from 0.2m/s to 0.7m/s are adopted for the underwater flat plate test in a precision water flume. And the wall shear stress is directly measured by MEMS sensors array. Also the boundary layer profiles of the investigated area upon the plate surface are detected with LDV and mean wall shear stress values are extrapolated. The results from the MEMS sensors match well with those from the LDV velocity profile fittings and are in good agreement with empirical estimations with an overall bias less than 5%.