随着介质输送旋转设备密封条件和要求的不断提高，作为关键部件的机械密封面临复杂介质、高参数工况特别是高温环境的严峻挑战，提高高温下机械密封性能的可靠性、稳定性极为重要和迫切。本项目拟以高温汽液固三相流体动压润滑机械密封为研究对象，通过微尺度润滑膜汽液固三相流动结构、运动特性、热力平衡特性、相变及相物性等分析和密封端面粗糙度建模，建立基于粗糙表面的微尺度汽液固三相流体润滑模型，研究高温下三相动压润滑形成和失效机理并提出动压润滑失效理论判据；深入研究基于三相流的密封环热-流-固耦合变形规律、固体颗粒沉积规律及其耦合作用对动压润滑失效的影响关系，以及运行工况、三相物性和端面微造型等参数与动压润滑失效临界状态及表征参数的关系，提出动压润滑失效预测方法；建立涉及多学科多因素协同的高温动压润滑密封性能预测模型，研究多学科多目标优化设计方法。项目成果将为高性能动压型机械密封的研发和稳定运行提供理论基础。

With the higher working conditions and requirements for different types of rotating sealing equipment, mechanical seal faces serious challenges for stable operation, especially in complex mediums, high-parameters working conditions. It is very important and urgent to improve the reliability and stability of performance of mechanical seals with high temperature environment. The project will research on vapor-liquid-solid three-phase hydrodynamic lubrication mechanical seal for high temperature liquid applications. Based on the analysis of vapor-liquid-solid three-phase flow structure, kinematic characteristics, thermodynamic equilibrium characteristics, phase changes, phase physical properties and the modeling of seal face roughness, a microscale vapor-liquid-solid three-phase flow lubrication model with rough surface is developed, and the criteria of hydrodynamic lubrication form and failure are proposed. The study on heat-fluid-solid coupling deformation laws, solid particle deposition laws and their coupling effects on hydrodynamic lubrication failure in three-phase flow are carried out. The influence of parameters such as working conditions, three phases physical properties and surface micro-shape structural on the critical state of hydrodynamic lubrication failure is analyzed, and the prediction method of hydrodynamic lubrication failure is proposed. The performance prediction model of high temperature hydrodynamic lubrication mechanical seals with multidisciplinary, multi-factors coupling is constructed, and the multi-disciplinary, multi-objective optimization design method is studied. The results of research project will provide the theoretical basis for the research development and stable operation of high-performance hydrodynamic mechanical seals.