A study of directional MEMS dual-fences gauge

In this paper, MEMS surface fence gauges are developed to measure simultaneously the magnitude and direction of wall shear stress in wind tunnel under two-dimensional turbulent boundary layers. The dual-fences are packaged together orthogonal to each other. In order to avoid the mutual influence caused by the flow field disturbance, the optimization analysis of the relative location of the two fences is carried out, and the simulation results indicate that the coupling influence between dual-fences was basically eliminated while the separation distance of two fences is four times its own length. Comparison experiments are made to verify the correctness of the flow simulation results, and the directional sensitivities of dual MEMS surface fence are calibrated, which indicated that MEMS dual-fences are equipped to distinguish direction of wall shear stress.