介质温升条件下流体静压型机械密封的瞬态响应研究

Research on Transient Response of a Hydrostatic Mechanical Seal during Sealed Medium Temperature Rise

考虑润滑液膜黏温效应与黏压效应,建立介质温升条件下流体静压型机械密封的热流体润滑动力学模型,采用有限差分法对广义瞬态Reynolds方程、能量方程和热传导方程等进行联合求解,采用Newmark法和时间步进法对动力学方程进行数值计算,分析在介质温升条件下机械密封性能参数的瞬态响应。结果表明,介质温度瞬时升高会破坏机械密封原有的平衡状态,密封性能参数将在很短时间内从原有稳定值振荡迁移到另一稳定值。

Considering the effects of sealed medium viscosity varying with temperature and pressure,a thermal-hydrodynamic lubrication model was presented for a hydrostatic mechanical seal with both convergent face and sealing dam onto its surface during a temperature rise of sealed medium.Finite difference method was used to obtain the joint solution for the generalized Reynolds equation,energy equation,and thermal conduction equation.Newmark method and time-marching method were used to solve the equation of motion.Transient response of sealing performance parameters with the temperature rise was analyzed.The results show that a temperature rise can disturb the initial stability of such a mechanical seal.Sealing performance parameters would oscillate and transfer from the initial stable value to another in a short time due to the temperature rise.