柱面气膜密封槽底导流织构性能提升及作用规律研究

Research on sealing performance improvement and functional rule of diversion texture at bottom of cylindrical gas film seal groove

研究如何提升柱面气膜密封的稳定性对保证该类密封在高速、高压工况下的安全运行至关重要,鉴于导流织构能够有效提升系统稳定性,本文通过在柱面气膜密封槽底设置一定数量和造型的导流织构,系统研究了不同工况下导流织构对柱面气膜密封性能的作用规律。结果表明:导流织构对柱面气膜密封微尺度流场具有良好的导流作用,最高压力及高压区面积都显著增大;一定工况和泄漏条件下,导流织构可以显著提升密封开启力;有导流织构的柱面气膜密封还可以显著降低高速、高压工况下微尺度流场中的压力波动方差,且转速越高,抑扰效果越显著。

Studying how to improve the stability of the cylindrical gas film seal is crucial to ensure the safe operation of such seals at a high speed and under high pressure working conditions.In view of the fact that the diversion texture can effectively improve the stability of the system,this paper design a certain number and shape of the diversion structure at the bottom of the cylindrical gas film seal groove,with the effect of the diversion structure on the sealing performance of the cylindrical gas film seal under different working conditions systematically studied.The results show that the diversion texture has a good diversion effect on the micro scale flow field of cylindrical gas film seal,and that the maximum pressure and high pressure area are significantly increased.Under certain working conditions and leakage conditions,the diversion texture can significantly improve the opening force,cylindrical gas film seal with diversion textures can significantly reduce the variance of pressure fluctuation in micro scale flow field at a high speed and under high pressure working conditions;the higher the speed,the more significant the disturbance suppression effect.