跨声速涡轮级三维流场的数值模拟

Numerical simulation of the three-dimensional flow field of a transonic turbine stage

采用FLUENT软件对某变循环发动机的高压跨声速涡轮级的三维粘性流场进行了数值模拟计算,使用混合平面法实现涡轮级动、静三维流场联算,计算中分别采用两个典型的双方程模型RNG k-ε模型和realizable k-ε模型,并将计算结果进行了对比,结果在一定程度上表明在分离流计算和带二次流的复杂流动计算中,Realizable k-ε模型的计算结果更精细一些。同时分析了其内部流场以及通道内总压损失的分布情况,为进一步改进叶型设计提供了理论依据。

A three-dimensional simulation was performed numerically for a VCE transonic turbine stage ,a CFD software FLUENT and the mixing plane model ware adopted during the calculation. The results of two typical models ofRNG k-ε model and realizable k-ε model were compared. The result indicted that Realizable k-ε model has a more finer result on calculation of flow with secondary flow and separated flow. The simulation result of the complex internal flow in the turbo machinery and the distribution of total pressure loss coefficient provided the theoretical basis for turbo profile designing and improving.