用Calspan式管测量显示亚声速流动

用上、下二根 Calspan 式管可满意地测量亚声速风洞通气壁附近的流动状态,从而可以用来进行洞壁干扰修正或自适应壁风洞迭代计算。从理论上分析,根据 Calspan 式管上、下孔测得的压力分布值,可计算出流向与法向的扰动速度分量。文章对 Calspan 式管的构造作了详细的介绍,并对试验装置及所使用的仪器和传感器作了说明。由于所测得的量值很小,介绍了试验的方法和采集数据的处理方法。

MEASUREMENT AND VISUALIZATION IN SUBSONIC FLOWS BY USE OF CALSPAN'S PIPES

The flow near the vent walls of subsonic wind tunnel havebeen displayed by using two Calspan pipes laid on up-and-down walls,and the method is presented in this paper.By utilizing the methodmentioned above,the wall interference correction and the iterative calcu-lation for the adaptive-wall wind tunnel can be done.By theoretically analysing the pressure distribution obtained fromup-and-down holes on Calspan pipes,the disturbance velocity componentsalong flow and normal directions can estimated.The construction of Calspan pipe has meticulously been presentedin this paper,and the test facilities,instruments and transducers havebeen stated.Owing to the measuring values are comparatively small,themethod and the process of data acquisition have also pre sented.