通过分析流体边界层分离原理,针对分离点附近物面剪应力的变化规律,提出了用微型热敏传感器阵列在被测物体表面贴附完成实时分离点检测的测量方案.同时,提出了基于流体壁面剪应力分布测量边界层分离点原理的一维微型热敏传感器阵列输出信号的处理方法,并利用柔性一维热敏传感器阵列在标准翼型NACA0012上进行低速风洞试验,得到流体剪应力对应翼型表面位置传感器上的输出电压数据.通过对试验结果进行数据处理,验证了该判定方法对分离点位置判定的正确性和有效性.
At the boundary layer's separation point, the fluid velocity drops to small value and then increases dramatically. This paper presents a processing method of the sensor array output signal, to calculate the flow separation location. Based on this method, we can use 1D MEMS-based thermal anemometer ar- ray to detect the location of the separation point. Through analyzing the methods and combination of the low speed wind tunnel test data, the position of the separation point can be detected accurately.