低湍流度风洞中的斜置翼三维边界层测量试验研究

MEASUREMENT OF THREE DIMENSIONAL BOUNDARY LAYER FLOW ON AN INFINITE SWEPT WING IN LOW TURBULENCE WIND TUNNEL

在西工大低湍流度风洞中，于不同后掠角和湍流度下，以４５°单丝热线探头，在斜置翼上测量三维边界层速度型并计算特征参数的情况表明：横流影响的规律性明显，三维速度型扭曲相当复杂；后掠角和湍流度增大时，速度型和厚度的发展、不同层次的流线偏移和特征参数的变化受横流影响更为明显。

This paper describes the measurements of velocity distribution of three dimensional boundary layer on an infinite swept wing with different swept angles and turbulence levels of the flow. The experiments are performed in the Low Turbulence Wind Tunnel of Northwestern Polytechnical University.The boundary layer velocity profiles is measured by using hot wire anemometer with a probe of single slanted wire. The characteristic parameters of the boundary layer are then calculated from the velocity measurements.The results have shown the regularity of the cross flow effect, and also the complexity of three dimensional velocity profile development. When swept angle and turbulence level increased,the effect of cross flow on the development of velocity distribution and boundary layer thickness and on vthe ariation of characteristic parameters will become more evident.