轴向斜槽式轮毂处理的三维流场分析

首次采用网格分区的方法,对带有轴向斜槽式轮毂处理的压气机叶栅通道流场进行了数值模拟,分析了轴向斜槽式轮毂处理的扩稳机理以及它对压气机性能的影响的原因所在,进一步探讨轴向斜槽的几何参数的变化对其扩稳效果的影响.在计算中采用了非交错网格的SIMPLE算法,求解时均N-S方程,紊流模型采用基于RNG(重整化群)方法的K-ε紊流模型. 

3-D Numerical Analysis of Axial Skewed Slotted Hub Treatment

The 3-D incompressible steady time -averaged N-S equation , K-ε turbulence model equations based on RNG method are applied to calculate the flowfield in the compressor cascade passage with axial skewed slotted hub treatment .By using the method of zonal grids, single grid system with lapped zones which would transfer the flow parameters is established in the course of calculation . The mechanism of extending stability of axial skewed slotted hub treatment and effect on the compressor are elaborated by means of a 3-D viscous numerical simulation. It is revealed that shape parameters of axial skewed slotted hub treatment are main factors which should be paid attention in the design of hub treatment . They strongly affect stable working range of the compressor.The SIMPLE algorithm with non-stagger grid is employed and the question of the pressure oscillating is solved.