篦齿封严装置流动诱导力的计算

本文以文献 1、 2 ]的模型和方法为基础 ,对篦齿封严装置的流动诱导力作了一些研究 ,导出有些不同的线化公式 ,算例结果也有所不同。图 1　偏心轴以Ω作进动运动在理想情况下 ,静子与转子轴同心 ,其径向间隙δ* 沿周向是均匀的 (*表示理想参数 ) ,这时 ,气流流经间隙的轴向分速 Ca*和切向分速 Cu* (由预旋或粘性引起 )沿周向都是均匀的 ,不会引起气动力。但由于制造、装配和弹性变形等原因 ,静子与转轴不可能绝对同心 ,设转轴偏心以角速度 Ω作进动运动 ,在瞬时 t处于图 1所示位置 ,很明显径向间隙δ沿圆周是不均的。因此气流的轴向分速 …

VALUATION OF FLOW-INDUCED FORCE IN LABYRINTH SEAL

The continuity equation and momentum equation of the flow through a sectorial element in labyrinth seal is linearized according to the presumption of the small disturbance and solved with the aid of matrix method.Then the distribution of the pressure on the cylindrical surface of rotor is obtained.Finally,the flow induced force on rotor is evaluated by means of integration.Numerical example indicates that as the number of seal chamber increases,the flow induced force increases while the leakage flow rate decreases;when the seal clearance increases,the flow induced force decreases while the leakage flow rate increases;but both the flow induced force and leakage flow rate decrease when the exit pressure increases.