中文摘要：

考虑密封介质粘度随压力和温度的变化,建立了流体静压型机械密封的流体润滑理论模型,采用有限差分法对广义Reynolds方程、广义能量方程、热传导方程等控制方程进行耦合求解,获得了介质温度瞬时升高对机械密封温度分布及密封性能参数的影响规律。结果表明,密封介质温度瞬时升高使端面开启力先增大后减小,泄漏率增大,液膜中各点温度值升高,而摩擦力减小,随着时间延长最后各密封性能参数均趋于稳定值;当热惯性系数较小时,开启力和泄漏率初始阶段增大趋势快,摩擦力减小趋势快,对于不同热惯性常数,密封性能参数达到的稳定值不变。

英文摘要：

A theoretical model of fluid lubrication is presented for a hydrostatic mechanical seal by considering the variation of dynamic viscosity to sealed fluid pressure and temperature.Finite difference method is used to get the coupling solution for the generalized Reynolds equation,energy equation,thermal conduction equation.The effects of temperature transient rising of the sealed medium on temperature distributions and performance parameters of such a mechanical seal are studied.The results show that when the sealed medium temperature increases sharply,opening force will increase at first and then decrease to a stable value.Accordingly the leakage will increase suddenly.The temperature profiles of seal rings and fluid film will also increase,but the friction torque falls sharply.All the sealing performance parameters will be stable at last.The more smaller the thermal inertia parameter is,the more rapidly opening force and leakage rate will increase.Friction force is on the contrary.The steady values of parameters vary with the thermal inertia parameters.