基于三维模型的偏心鼓筒气动特性分析

为了获取篦齿封严鼓筒齿腔内的压力分布,掌握鼓筒气动特性情况,建立了带封严篦齿鼓筒的三维流场通道模型,计算转静子同心和不同偏心量条件下鼓筒表面静压,分析气动载荷作用下鼓筒的力学特性.仿真结果表明:偏心量的变化使表面静压出现复杂变化,周向静压幅值变动明显,最大偏心量下的静压幅值比无偏心时增长3倍;偏心引起的周向静压波动使鼓筒应力幅值最大浮动3%左右.

Aerodynamic characteristics analysis of eccentric drum basedon three-dimensional model

In order to obtain the pressure distribution inside the cavity of drum with labyrinth seal, and understand its aerodynamic characteristics, a three-dimensional model of the flow field channel of drum with labyrinth seal was developed, and the static pressure on the surface of drum with and without eccentricity between the drum and the stator was calculated. Then, the mechanics characteristics of drum under aerodynamic loads was analyzed. The simulation results show that different eccentricities complicate the surface static pressure, and change the circumferential static pressure amplitudes obviously. The amplitude of static pressure with the largest eccentricity increases 3 times compared with that without eccentricity. The maximum fluctuation of drum stress amplitude caused by circumferential static pressure considering eccentricity is about 3%.