迷宫密封中可压流体流场的数值模拟

应用Fluent软件计算迷宫密封间隙宽度和空腔深度以及直通式迷宫密封和错列式迷宫密封对迷宫密封流场和泄漏量的影响。计算结果与分析表明,间隙宽度对泄漏量的影响体现在通过改变空腔进出口面积来改变泄漏量。所以泄漏量随间隙宽度呈线性变化。在实际运用中,在保证安全的情况下尽量减小间隙宽度;在一定条件下,空腔深度越大,紊流程度下降,泄漏量越大;错列式迷宫密封的泄漏量要明显小于直通式迷宫密封。

Numerical Simulation of Imcompressible Flow in Labyrinth Seals

Fluent was used in calculating labyrinth seal flow field and leakage flow rate, which are effected by labyrinth seal clearance, cavity depth and the structure,including straight through labyrinth seal and interlocking labyrinth seal. Through the analyzing of the result, it shows that the leakage flow rate is affected by the inlet area,and the flow rate changed with the width of clearance linearly,so in practice,the width of clearance should be reduced minimum in the permission of security;in the same condition,when increasing the depth of cavity, the degree of turbulence is decreased,which in lead to an increase of leakage flow rate;evidently the leakage flow rate of interlocking labyrinth seal is less than that of straight through labyrinth seal.