涡轮泵用动静压型机械密封性能数值分析  

Numerical analysis on performance of hydrodynamic-hydrostatic hybrid mechanical seals for turbopumps

作　　者：孟祥铠[1] 肖远航 赵文静[1] 江锦波[1] 彭旭东[1] MENG Xiangkai;XIAO Yuanhang;ZHAO Wenjing;JIANG Jinbo;PENG Xudong(Institute of Chemical Process Machinery,Zhejiang University of Technology,Hangzhou 310032,China)

机构地区：[1]浙江工业大学化工过程机械研究所,杭州310032

出　　处：《航空动力学报》2024年第8期421-432,共12页Journal of Aerospace Power

基　　金：国家自然科学基金(52175193)。

摘　　要：针对密封端面液氧的低动力黏度难以成膜的特性,提出一种动静压结合型机械端面密封。考虑节流孔的静压效应和液膜空化效应,建立了液膜的有限元分析模型,研究了动静压型机械密封的工作原理,分析了端面动静压结构几何参数对密封性能的影响规律。研究结果表明:动静压型机械密封的节流孔将静压效应引入密封端面,螺旋槽在提高液膜动压效应基础上将经节流孔流入的介质泵送回密封腔,提高了上游泵送量。在研究范围内,推荐的动静压结构几何参数的优选范围如下:螺旋槽槽台宽比为0.6~0.7、槽坝比为0.6~0.7、槽深为12~15μm、螺旋角为15°~18°,静压节流孔孔径为0.4~0.5 mm、节流孔个数为6~12个。In view of the characteristics of low dynamic viscosity and hard film forming of liquid oxygen on the sealing face,a hydrodynamic-hydrostatic hybrid mechanical seal was proposed.Considering the hydrostatic effect of the orifice and the cavitation effect of the liquid film,the finite element analysis model of the liquid film was established to study the working principle of the hydrodynamic-hydrostatic hybrid mechanical seal and analyze the influences of the geometrical parameters of the hydrodynamic and hydrostatic structure on the sealing performance.Within the research scope,the optimum range of the geometrical parameters of the spiral groove and hydrostatic structure was as follows:the groove-weir ratio was 0.6—0.7,the groove-dam ratio was 0.6—0.7,the groove depth was 12—15 μm,the spiral angle was15°—18°,the orifice diameter was 0.4—0.5 mm,and the orifice number was 6—12.

关 键 词：动静压型机械密封 液氧 有限单元法 节流孔 涡轮泵 

分 类 号：V231[航空宇航科学与技术—航空宇航推进理论与工程] TH117.2[机械工程—机械设计及理论]