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动静压混合式气体密封(DHHGS)运行中,静环对动环轴向窜动和角向摆动的跟踪响应(追随性)能够降低外界干扰对密封稳定性造成的影响。将DHHGS简化为弹簧-阻尼-质量系统,基于摄动法求解了DHHGS的动态非线性Reynolds方程,得到了表征密封动态特性的气膜刚度和阻尼系数。研究了两种DHHGS(泵入式和泵出式)在3个方向简谐激励作用下的追随性,并得到了阻封气压力对追随性的影响规律,分析了主动调控时静环的轴向自振稳定性,并给出了轴向自振的临界失稳判据。研究结果表明:即使激励振幅足够大,DHHGS仍具有良好的追随性;阻封气压力增大,密封的追随性增强;主动调控时,静环自由振动是非往复的衰减运动,密封仍能稳定运转。
In static and dynamic mixed gas seal (DHHGS) operation, the tracking response (followability) of the stationary ring to the axial and angular oscillation of the moving ring can reduce the influence of external interference on the sealing stability. The DHHGS is simplified as a spring-damper-mass system, and the dynamic nonlinear Reynolds equation of DHHGS is solved based on the perturbation method. The stiffness and damping coefficient of the gas film, which characterize the dynamic characteristics of the seal, are obtained. The followings of two kinds of DHHGS (pump-in and pump-out) under simple harmonic excitation in three directions were studied, and the influence rule of gas pressure on followability was obtained. To the natural vibration stability, and gives the axial instability of the critical instability criterion. The results show that DHHGS has good followability even when the excitation amplitude is large enough, the pressure of seal gas increases and the followability of seal increases. When the active regulation is made, the free vibration of the stationary ring is non-reciprocating decay, and the seal can still operate steadily .