叶片安装角槽式轮毂处理的三维数值模拟

3-D NUMERICAL SIMULATION OF BLADE-ANGLE SLOTTED HUB TREATMENT

采用三维定常不可压Ｎ－Ｓ方程对叶片安装角槽式的轮毂处理的叶栅通道进行了数值模拟，分析了叶片安装角槽式的轮毂处理的扩稳机理，在计算中采用了非交错网格的ＳＩＭＰＬＥ算法，并解决了因使用非交错网格离散方程而带来的压力场振荡的抑制问题，紊流模型采用ｋ－ε两方程模型。

Three-dimensional incompressible steady time-averaged N-Sequation,continuity equation and k-ε turbulence model equations are applied to calculation of the flowfield in the cascade passage with blade-angle slotted hub treatment.The mechanism of extending stability by blade-angle slotted hub treatment is elaborated by means of a three-dimensional viscous numerical simulation.It is revealed that a pressure difference between suction and pressure sides induces a strong flow which enters in the rear of the slot and pours out from the front of the slot.This flow blows off the low energe boundary layer and retards stall emergence.The SIMPLE algorithm with non-stagger grid is employed to solve the problem of the pressure oscillation.