利用双焦点激光测速仪测量小型风洞中单个叶型绕流的试验研究

为了验证各种气体动力学数值计算方法的可靠性,在小型风洞中对单个叶型绕流进行了一系列测量,利用双焦点激光测速仪(L2F)和测取叶型表面、壁面静压对全亚声速流场及含有激波的跨声速流场进行了细致的研究,同时还进行了激波振荡现象及探头对流场的影响的研究。获得的结果不仅可以用于检验描述流动的各种数值模型的正确性或可靠性,同时也为进一步发展数值模型提供了实验数据。通过在简单流场中的测量,积累了一些经验,例如激波前后移动现象的判析与处理,有利于今后在复杂流场中的测量。

EXPERIMENTAL INVESTIGATIONS ON THE FLOW AROUND A SINGLE AEROFOIL IN WIND TUNNEL USING A L2F VELOCIMETER

In order to prove the reliability of some computationalaerodynamic methods,a series of measurements were made for the flowaround a single aerofoil in a small wimd tunnel.Both the full subsonicflowfield and the transonic flowfield with a shok wave were tested indetail using laser-2-focus velocimeter(L2F)and picking up the staticpressure distributions on the aerofoil surface and on the end wall.Inaddition,the phenomenon of shock wave motion and the influence ofinserting probe on the flowfields were also noted.The results obtainednot only may be used to check some numerical models which have beendeveloped to describe the flow.but also provide experimental data fordeveloping numerical methods further.We have gained some experiencein the measurement of physical quantities associated with phenomenawhich are difficult to measure,for instance,shock wave motion in asimple flowfield.As we are becoming able to measure such quantities,more complicated situations can be handled.