Study on the influence of nonlinear effect on performance of dry gas seal under film thickness disturbance

doi:10.11949/0438-1157.20201105

Abstract

Abstract:

Based on the gas lubrication theory, the steady-state and transient-state theoretical models of the spiral groove, upstream pumping spiral groove and double-row spiral groove dry gas seal(DGS) were established, and were solved by using the finite difference method, and then the steady and transient seal performance parameters of the three typical spiral groove DGSs were obtained. The mechanism of difference in steady performance of the three typical spiral groove DGSs and the evolution rule of transient performance of the DGSs under different film thickness disturbances were studied. On this basis, the change rates of transient performance parameters and its time average values relative to steady values were defined. The influence of nonlinear effect under film thickness disturbance on performance of the DGSs and the suitable range of steady theory were explored. The results show that upstream pumping spiral groove has a significant improvement on the sealing performance, but has a certain weakening on the opening performance. The influence of nonlinear effect increases with the increase of film thickness disturbance, and the average value of performance parameters of the DGSs calculated based on transient theory is obviously larger than that of steady value under large film thickness disturbance, at this time, the error of calculation results based on steady theory is large. Ordinary spiral groove DGS is least affected by nonlinear factors, and within the acceptable performance error range of its steady-state theory, the permissible film thickness disturbance is greater than that of the other two spiral groove DGS.

Key words: dry gas seal, spiral groove, film thickness disturbance, transient-state performance, nonlinear effect

摘要：

基于气体润滑理论，建立了普通螺旋槽、上游泵送螺旋槽和双列螺旋槽三种典型螺旋槽干气密封（DGS）的稳、瞬态模型，采用有限差分法求解并获得了三种典型螺旋槽DGS的稳、瞬态密封性能参数。研究了三种典型螺旋槽DGS稳态性能差异的产生机理及不同膜厚扰动条件下干气密封瞬态性能的演变规律，定义了瞬态性能参数及其时间平均值相对稳态值的变化率，探究了膜厚扰动下的非线性效应对三种典型螺旋槽DGS瞬态性能的作用规律及稳态理论的适用范围。结果表明：上游泵送螺旋槽的开设对密封性有明显提升但对开启性有一定削弱；非线性效应的影响随膜厚扰动的增大而增大，在膜厚大幅扰动下，基于瞬态理论计算的密封性能参数平均值会明显大于稳态值，此时依靠稳态理论获得的计算结果误差较大；普通螺旋槽DGS受非线性因素的影响最小，在其稳态理论可接受的性能误差范围内，所允许的膜厚扰动相比另外两种螺旋槽DGS更大。

关键词: 干气密封, 螺旋槽, 膜厚扰动, 瞬态性能, 非线性效应

CLC Number:

TH 117.2

SHANG Hao, CHEN Yuan, LI Xiaolu, WANG Bingqing, LI Yuntang, PENG Xudong. Study on the influence of nonlinear effect on performance of dry gas seal under film thickness disturbance[J]. CIESC Journal, 2021, 72(4): 2213-2222.

商浩, 陈源, 李孝禄, 王冰清, 李运堂, 彭旭东. 膜厚扰动下的非线性效应对干气密封性能影响研究[J]. 化工学报, 2021, 72(4): 2213-2222.

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