涡轮泵密封动力学特性和封严性能的分析与优化  

Dynamic coefficients analysis and optimization research on turbo pump seal

作　　者：涂霆 何立东[1] 李宽[1] 胡航领 张力豪 

机构地区：[1]北京化工大学化工安全教育部工程研究中心,北京100029

出　　处：《中国科技论文》2016年第22期2568-2574,共7页China Sciencepaper

基　　金：国家重点基础研究发展计划(973计划)资助项目(2012CB026000);高等学校博士学科点专项科研基金资助项目(20110010110009)

摘　　要：针对氢涡轮泵由流体激振产生次同步振动问题,采用CFD软件进行了数值计算,分析了该涡轮泵密封的动力学特性和泄漏量。首先,研究了涡轮泵离心轮原始梳齿迷宫密封的偏心率、密封间隙、密封齿厚和密封齿数对密封动力学特性系数的影响,结果表明改变原梳齿迷宫密封的结构参数对动力性能提升有限。在此基础上,改进该密封为孔型密封并进行计算和分析,结果表明孔型阻尼密封的动力学特性及泄漏量较迷宫密封有极大改善;通过计算分析进一步优化了孔型密封的周向孔数、孔深、密封间隙和孔排布方式,得出交错布置的周向80孔、孔深3.3mm的孔型密封性能最优。进一步计算了1组蜂窝密封的动力学特性系数,与孔型密封进行比较,得出蜂窝密封较孔型密封动力学性能略有提升。To solove the sub-synchronous vibration problem in hydrogen turbo pump of a certain model liquid rocket engine excited by fluid in its seal,the dynamic coefficients and leakage of the seal are numerically calculated and analyzed.Firstly,the turbo pump centrifugal wheel labyrinth seal eccentricity,tip clearance,number of teeth and tooth thickness＇ effects on sealing dynamic coefficients are investigated and results indicate that the dynamic performance promotion by changing structural parameters is limited.On this basis,labyrinth seal is optimized to hole-pattern seal and the new seal is analyzed likewise.Results show that the dynamic coefficients and leakage of hole-pattern seal are greatly superior to labyrinth seal.Furthermore,the circumferential＇s hole number,hole depth,seal gap and hole arrangement of the hole-pattern seal are optimized and results find that when the circumferentially staggered arrangement hole number is 80 and hole depth is 3.3mm,seal performance is the optimal.Finally,a group of dynamic coefficients of honeycomb seal are calculated,and the results indicate that the dynamic coefficients of honeycomb seal are slightly better than hole-pattern seal.

关 键 词：密封动力学特性 梳齿迷宫密封 孔型密封 蜂窝密封 CFD 

分 类 号：V434.21[航空宇航科学与技术—航空宇航推进理论与工程]