大负攻角下汽轮机末级动叶栅二维分离流特性的数值分析

Numerical Analysis of the Behavior of Two-dimensional Separation Flow of a Turbine Last Stage Rotor Cascade at Large Negative Incidence

采用控制容积积分法及压力修正算法 ,结合κ -ε湍流模型求解二维稳态雷诺时均N -S方程组 ,对一透平动叶栅在不同负攻角条件下的分离流动进行了数值模拟。计算结果与试验结果吻合较好。根据计算结果对大负攻角条件下叶栅二维分离流动的特点以及攻角对叶栅气动特性的影响进行了分析。

Finite volume approach and pressure-correct method are applied to numerically solve two-dimensional steady time-average N-S equations closed with κ-ε turbulence model and the separation flow in a turbine last stage rotor cascade at different negative incidence are simulated. The computational results are in agreement with experimental results. According to the obtained results, the behavior of the separation flow and the effects of negative incidences on the aerodynamic characteristics of cascade are analyzed.