关键词: 旋转盘腔;湍流模型;数值仿真

Abstract: To investigate the effectiveness of turbulence model near wall on the flow nature inside a rotating disc cavity, the zonal modelling approach was applied for the computation of flow inside a rotor-stator disc cavity with radial outflow and a co-rotating disc cavity with radial outflow. In the core region of the cavity the standard k-e turbulence model was employed. In the near wall region two low Reynolds number turbulence models were employed, they were single equation model and Launder-Sharma two equations. The results showed that the k-e /1-eqn predictions appear to be in closer agreement with the experimental data for the ro-tor-stator case, whereas for the co-rotating case, the Launder-Sharma low Reynolds number turbulence model is obviously superior to the single equation model. The treatment of near-wall turbulent characteristics seems to be very important to the simulation accuracy.

Key words: Rotating disk cavity;Turbulence model;Numerical simulation