摘要
理论分析了考虑实际气体参数的迷宫密封泄漏量计算公式与流动控制方程,基于转子多频椭圆涡动方法研究了不同气体介质对迷宫密封静力与动力特性的影响,揭示了实际气体参数对迷宫密封静力与动力特性影响的机理。结果表明:气体摩尔质量对迷宫密封的泄漏量呈正相关影响;在相同转子涡动频率下,随着气体摩尔质量的增大,主刚度系数、主阻尼系数和交叉阻尼系数的绝对值逐渐增大;密封气流力随着气体摩尔质量的增大而增大,CO2介质密封气流力是CH4介质密封气流力的1.63倍;随着转子涡动频率的增大,气体摩尔质量对有效阻尼系数的影响从惯性效应转移到摩阻效应,有效阻尼系数随着气体摩尔质量的增大在低频时增大、在高频时减小。
A theoretical analysis was conducted on the formula to calculate the leakage rate of labyrinth seals considering actual gas parameters and on the equation for the flow control.Based on the rotor multifrequency elliptic vortex method,the effects of medium category and real gas parameters on the static and dynamic characteristics of labyrinth seals were studied.Results show that the molar mass of gas is positively correlated with the leakage rate of labyrinth seals.At the same frequency of rotor vortex oscillation,the absolute values of direct stiffness coefficient and of main and cross damping coefficient increase with the rise of the molar mass of gas.The flow force increases as the molar mass of gas rises,and the flow force of medium CO2 is 1.63 times as much as CH4.As the frequency of vortex oscillation increases,the influence of molar mass on the damping coefficient gradually transfers from the inertial effect to the frictional effect,therefore,as the molar mass of gas increases,the effective damping coefficient increases at low frequency and decreases at high frequency.
作者
孙丹
邹静岚
赵欢
肖忠会
孟继纲
于小丹
SUN Dan;ZOU Jinglan;ZHAO Huan;XIAO Zhonghui;MENG Jigang;YU Xiaodan(Liaoning Key Lab of Advanced Test Technology for Aerospace Propulsion System,School of Aero-Engine,Shenyang Aerospace University,Shenyang 110136,China;Collaborative Innovation Center of Major Machine Manufacturing in Liaoning,Shenyang Blower Works Group Corporation,Shenyang 110142,China)
出处
《动力工程学报》
CAS
CSCD
北大核心
2020年第1期14-22,30,共10页
Journal of Chinese Society of Power Engineering
基金
国家自然科学基金资助项目(51675351)
中国博士后科学基金资助项目(2018M633572)
辽宁省高等学校创新人才支持计划资助项目(LR2016033).
关键词
迷宫密封
实际气体参数
泄漏量
动力特性
多频法
labyrinth seal
real gas parameter
leakage rate
dynamic characteristics
multiple frequency method
作者简介
孙丹(1981-),男,辽宁丹东人,教授,博士,主要从事透平机械先进密封技术方面的研究。电话(Tel.):13998119400,E-mail:phd_sundan@163.com。
