微米间隙密封气膜冷凝析水润滑机理与表面织构润湿控制

Vapor condensation effect of seal gas film is one of key factors that result in seal failure and restrict application of gas seal. In the present project,surface texture is proposed to solve vapor condensation problem of seal gas film by controling wettability, and study will be carried out on properties of vapor condensation lubrication of seal gas film in micron-clearance and control method of surface texture wettability. The research will be conducted mainly in three aspects. Firstly, to develop condensation vapor lubrication model of high pressure seal gas film based on gas property and fluid hydrodynamic lubrication theory, so as to analyze mechanism of vapor condensation lubrication and effect of surface texture. Secondly, to model wettability and water vapor adsorption of textured surface based on interface property of solid and liquid, so as to investigate influence of surface texture on vapor adsorption. Finally, to carry out seal test of water vapor adsorption control with surface texture, in order to find out influence of vapor condensation and adsorption on seal performance in micron-clearance and control method with surface texture. After comparison of theoretical and experimental results, to discuss the mechanism of property of vapor condensation lubrication of seal gas film in micron-clearance and to propose control method with surafce texture, so as to provide dependence for stability design of seal face in the cases of high pressure, low temperature and water mediu. It will be helpful for the gas seal to solve problem of vapor condensation and to extend its application fields.

密封气膜冷凝析水易导致密封失效并制约气体密封技术在水汽介质装备中的应用，项目提出利用表面织构对润湿性的控制解决密封气膜的冷凝析水问题，拟开展微米间隙密封气膜冷凝析水润滑机理与表面织构润湿控制研究，主要包括三个方面，其一是基于气体性质和流体润滑理论，建立气体密封冷凝析水润滑模型，研究微米间隙水汽冷凝析出润滑特性及表面织构影响规律；其二是基于固/液界面性质，建立织构化密封端面水汽润湿吸附模型，研究微米间隙中表面织构对水汽析出吸附特性影响规律；其三是开展水汽吸附表面织构控制润滑密封实验，研究表面织构对微米间隙水汽吸附润滑密封的影响规律和控制方法。通过理论和实验结果的对比分析，探讨织构端面水汽析出润滑密封机理和控制规律，为高压、低温、水汽介质工况下气体密封端面结构稳定性设计提供依据，对于解决干气密封端面冷凝润滑失效、拓展气体密封应用领域具有非常重要的意义。

本项目开展了微米间隙密封气膜冷凝析水润滑机理与表面织构润湿控制研究。基于气体性质和流体润滑理论，建立了气体密封冷凝析水润滑模型，研究了微米间隙水汽冷凝析出润滑特性及表面织构影响规律；基于固/液界面性质，建立了织构化密封端面水汽润湿吸附模型，研究了微米间隙中表面织构对水汽析出吸附特性影响规律；开展了水汽吸附表面织构控制润滑密封实验，获得了表面织构对微米间隙水汽吸附润滑密封的影响规律，提出了利用表面织构对冷凝液滴运动的控制方法。项目研究结果进一步完善了气体润滑和密封理论，对于解决干气密封端面冷凝润滑失效提供了可行理论和方法。