水力机械的动密封是本行业难题之一，端面微造型机械密封的密封润滑机理研究是获得高性能密封的关键。本项目根据零泄漏非接触要求首次提出具有宏观槽和微凹腔形貌组合表面的新型液体机械密封，拟在研究其微尺度区域内粘性耗散、热扩散、近壁流体物理特性、边界层诱导和空化形态等问题，进而获得粘温模型、双电层等微尺度效应数学关系和凹腔空化模型的基础上，建立真实描述密封内部热流体行为的理论模型。通过理论分析、多重耦合数值模拟和试验研究相结合，着重研究不同密封工况、不同形貌参数组合条件下的热变形、润滑膜流场结构、压力脉动频率特性及其与动压效应、泵送效应的关系，获得影响润滑膜特性的因素及内在规律性，深入分析密封润滑机理。同时，研究密封端面跨尺度组合形貌优化设计方法，探索新型激光微造型工艺，为试验研究和理论模型的修正、验证提供保证，并形成零泄漏非接触液体机械密封新技术。本研究旨在为水力机械行业高性能密封技术提供新途径。

Moving seal is one of the difficult problem in the hydro machinery field. Study on the lubrication mechanism of mechanical seals with facial geometry structure is the key point to obtain the high performance seal. Based on the requirement of zero-leakage and non-contact, a new type of fluid mechanical seal with combination of micro lubrication pores and macro pumping grooves on the seal ring face is introduced for the first time in this research project.Scientific problems such as viscous dissipation, heat diffuse, physical characteristics , boundary layer transfer of fluid near to the wall and cavitation form, etc, will be studied to build the mathematic relation of viscous-temperature model and double electric layer to establish the new theoretical model which truly describes the heat and flow mechanism in the seal.Theoretical analysis, multi-coupling numerical simulation and experimental research is applied to study the flow field structure, cavitation characteristics, pressure fluctuation frequency and dynamic pressure effect, to obtain the main factors and their internal laws, to deeply analysis the mechanism of seal lubrication mechanism.At the same time, the optimal design method for the mechanical seal with facial geometry structure is researched, as well as the new type laser micro processing technical, to provide necessary modification and verification for theoretical and experimental research, and finally to establish the new technology of zero-leakage and non-contact fluid mechanical seal.This research project will provide new approach for high performance seal technology in the hydro machinery field.