螺旋槽造型端面液体机械密封内流场的数值分析

端面螺旋槽造型机械密封的研究已取得重要进展，特别是螺旋槽干气密封已在生产中得到应用，但对于螺旋槽液体机械密封内流场特性及性能的研究还有待深入。在分析液体机械密封特点和机理的基础上建立端面液膜压力控制方程，采用FLUENT软件分别对普通机械密封和螺旋槽机械密封内流场进行数值模拟，得到密封的压力、壁面剪切力、速度分布图和泄漏量，并进行对比，深入分析内流场特性与密封性能的内在联系。研究表明：与普通机械密封相比，螺旋槽液体机械密封端面存在明显超出介质压力的高压区和密封内径处泄漏液回吸等现象，这是螺旋槽密封泄漏量小得多并产生明显开启力的主要原因。

A Numerical Analysis of the Inner Flow Field with Spiral Groove Shape Face for Liquid

End spiral groove shape mechanical seal research has made significant progress, especially in the production of dry gas seal for spiral groove has been applied, but the inner flow field for liquid mechanical seal characteristics and performance of the research is still further. The liquid membrane surface pressure control equations are established basing on the analysis of the characteristics and mechanism of liquid mechanical seal, using FLUENT for Conventional Mechanical Face Seal (CMFS) and spiral groove mechanical seal of the flow field in numerical simulation. The pressure, wall shear force, velocity distribution and leakage are presented, comparison, and analysis in depth of characteristics and the sealing performance. The results show that compared with CMFS, spiral groove liquid mechanical seal face exist beyond the obvious of high and medium pressure, get seal leakage of liquid back the diameter, and so on. Which is the main reason for smaller leakage of the spiral groove mechanical seal and producing significant opening force.