中文摘要：

针对传统Reynolds空化边界不能准确预测机械密封泄漏率的问题,采用JFO空化边界条件,建立了基于质量守恒的LaserFace液体润滑机械密封数学模型,采用流线迎风有限单元法求解润滑方程,对比分析了不同操作工况下4种不同端面型槽结构（普通端面、仅含引流槽端面、仅含回流槽端面、激光脸）的密封性能.结果表明：所建立数学模型可准确预测机械密封泄漏率,LaserFace端面在低速时易于打开,高速低压下回流槽具有明显回流泵送作用,LaserFace端面机械密封泄漏率显著低于仅含引流槽端面,摩擦系数小于普通端面,综合性能明显优于其他型槽结构.

英文摘要：

The Jakobsson-Floberg-Olsson （JFO） cavitation boundary condition was used to solve the problem that traditional Reynolds cavitation boundary condition can not accurately predict the mechanical seal leakage rate. The mathematical model of LaserFace liquid lubricated mechanical seal （LF-MS） was established based on mass conservation. Lubrication equation was solved by the streamline upwind finite element method. The comparison of sealing performance among four types of a LF-MS, a general face seal, a general face seal with ＂entry flow＂ structures, a general face seal with ＂return flow＂ structures was performed under different operating conditions. The mathematical model could accurately predict the mechanical seal leakage rate. LF-MS end face was easy to open at a low speed, Return grooves had obvious return pumping action at a high speed and low pressure. The leakage rate of LF-MS was significantly lower than a general face seal with ＂entry flow＂ structures. The friction coefficient of LF-MS was smaller than that of the general end face. The overall performance was significantly better than the others.