波度及静环静态角偏差对螺旋槽气体端面密封稳态特性的影响

Influence of the Face Wave and Static Stator Angular Misaligment on the Steady-state Behavior of Spiral Groove Gas Face Seals

建立了考虑螺旋槽气体密封端面周向波度及静环静态角偏差的理论模型。利用有限元法数值求解稳态雷诺方程,得到了端面周向气膜压力分布,进一步分析了不同压缩数下周向波度及静环静态角偏差对密封稳态特性参数的影响规律。结果表明:中、高压缩数下,波度及静环静态角偏差对气膜周向压力分布及径向压力梯度产生显著影响;波幅及波数对密封稳态特性影响不尽相同;过大的静环静态角偏差会导致端面气膜压力出现不均匀的峰值及谷值,使密封产生剧烈偏摆,造成端面瞬间接触,加剧端面磨损,最终导致密封泄漏失效。

A theory model considering the face circumferential wave and static stator angular misaligment of spiral groove gas face seals was given. The steady-state Reynolds equation was solved by means of the finite element method, and the film pressure distribution between the seal faces was gained. The influence of the face circumferential wave and static stator angular misalignment at different compressible mumbers on the seal steady-state behavior was analysed. The results indicate that the circumferential film pressure distribution is dramatically influenced by the face circumferential wave and static stator misaligment. The wave amplitude and number have different influence on the steady-state behavior. The seal faces may instantaneously contact and intensely wobble due to uneven film pressure. The gas seal may fail due to excessive leakage caused by serious face wearing.