预旋进气位置对转静盘腔换热影响的数值研究

对具有不同预旋进气位置的转静盘腔内的换热进行了数值模拟.在进气流量恒定的条件下, 改变预旋孔在静盘上的径向位置, 研究了旋转雷诺数、预旋角、转静盘间距等参数对进出口气流的无量纲总温降和转盘换热效果的影响.研究表明:旋转雷诺数的增大和转静盘间距的减小都能够增强气流对转盘的换热效果;当预旋孔的径向位置增大时, 无量纲总温降和转盘表面的平均努塞尔数都是先增大后减小, 预旋孔存在一个最优的径向位置. 

Numerical studies of heat transfer in a rotor-stator cavity with different radial positions of pre-swirl inlet

The three-dimensional numerical simulations of heat transfer in a rotor-stator cavity with pre-swirl nozzles at different radial positions in the stator were conducted in this paper.The standard k-ε turbulence model and unstructured grid were applied with the purpose of investigating the heat transfer characteristics.Under the constant mass flow rate and the different radial position of the pre-swirl nozzles, the outflow temperature and the effect of heat transfer on the rotor are greatly affected by the different rotational Reynolds number, pre-swirl angle and rotor-stator gap.The results show that the heat transfer of the rotor is enhanced with the increase of the rotational Reynolds number or the decrease of the rotor-stator gap.When the pre-swirl nozzles were moved out along the radial direction, the temperature difference between the inlet and the outlet and the averaged Nusselt number take on up-down tendency, that is, exists a optimum radial position of the pre-swirl nozzles.