迷宫式密封装置气弹力的计算

CALCULATION OF FLOW-INDUCED FORCE IN LABYRINTH SEALS

采用射流理论和ＢＬＡＳＩＵＳ圆管理论，导出了密封中各个动力系数的表达式，使密封中各个动力系数的计算更加实用、简单。

A two control volume model is applied to compressible leakage flow in a labyrinth seal,and its basic equations are derived.Recirculation velocity in its cavity is incorporated into the model and its wall friction forces are obtained from Blasius formula.Calculation of the circulation velocity in the cavity is based on jet theory.In solution of the equations,the linearized zeroth and first order perturbation equations are deduced.The matrix equations are solved by a new method so as to express each dynamic factor more easily.The results of the calculation are in good agreement with the experimental data.The calculation shows that the inverse swirl enhances the stability of the rotor.This fact is also proven by experiments.