测量与预测二维不可压湍流附面层分离

采用激光多普勒技术测量了二维扩压器中可压湍流附面层分离流动 ,得到了时均速度和湍流量 ;表面摩擦系数沿程分布及时均速度分布与经验关系式做了比较。预测中应用准同时粘性 /无粘流匹配模型 ,并比较了两种形状因子 H1=H1( H)的经验关系所得的预测结果。在最大反流以前 ,所预测的附面层特征与实验吻合。

MEASUREMENT AND PREDICTION OF INTERNAL 2-D TURBULENT BOUNDARY LAYER SEPARATION

An incompressible turbulent boundary layer separation in a two dimensional diffuser was surveyed using laser doppler velocimeter,and its time averaged velocities and turbulence quantities were obtained.The time averaged velocity profiles were compared with several empirical relationships.Prediction was made by using a quasi simultaneous viscous/inviscid interaction model and was compared with the experiment.The prediction with two empirical relationships of shape facter H 1=H 1(H) was compared.The prediction is in agreement with the experiment before the strong reversing flow.