考虑惯性效应的超临界二氧化碳干气密封动态特性研究  

Study on Dynamic Characteristics of Supercritical Carbon Dioxide Dry Gas Seal Considering Inertia Effect

作　　者：杨青[1] 孙鑫晖[1] 郝木明[1] 梅宝 李振涛 任宝杰 YANG Qing;SUN Xinhui;HAO Muming;MEI Bao;LI Zhentao;REN Baojie(College of New Energy,China University of Petroleum(East China),Qingdao Shandong 266580,China;College of Petroleum Engineering,China University of Petroleum(East China),Qingdao Shandong 266580,China;Dongying Hiscien Sealing Technology Co.,Ltd.,Dongying Shandong 257067,China)

机构地区：[1]中国石油大学(华东)新能源学院,山东青岛266580 [2]中国石油大学(华东)石油工程学院,山东青岛266580 [3]东营海森密封技术有限责任公司,山东东营257067

出　　处：《润滑与密封》2022年第1期44-52,共9页Lubrication Engineering

基　　金：国家重点研发计划项目(2018YFB2000800);国家自然科学基金项目(51975585)。

摘　　要：为了分析惯性效应对超临界二氧化碳干气密封动态性特性的影响规律,建立考虑惯性效应的变黏度变密度螺旋槽干气密封动态特性数学模型,采用有限差分法和小扰动法求解超临界二氧化碳干气密封动态特性参数,分析操作工况远离及靠近临界点时,超临界二氧化碳干气密封动态特性变化规律及惯性效应对其影响程度。结果表明:无论操作工况是否靠近临界点,动态特性系数都随压力的增大而增大,动态刚度系数随转速的增大而增大;动态阻尼在近临界点随转速的增大而增大,远离临界点则相反;考虑惯性效应时的动态特性系数比不考虑惯性效应时的偏低;操作工况近临界点时,惯性效应不可忽略,远离临界点时,惯性效应可忽略不计。In order to analyze the influence of inertia effect on the dynamic characteristics of supercritical carbon dioxide dry gas seal,a mathematical model of dynamic characteristics of spiral groove dry gas seal with variable viscosity and variable density was established,and the dynamic characteristic parameters of supercritical carbon dioxide dry gas seal were solved by finite difference method and small disturbance method.The variation of dynamic characteristics of supercritical carbon dioxide dry gas seal and the influence of inertia effect on dynamic characteristics were analyzed when the operating condition is far from and close to the critical point.The results show that no matter whether the operating condition is close to the critical point or not,the dynamic characteristic coefficient increases with the increase of pressure,and the dynamic stiffness coefficient increases with the increase of rotating speed.The dynamic damping increases with the increase of rotating speed at the near critical point,but it is opposite at the far critical point.The dynamic characteristic coefficient with considering the inertia effect is lower than that without considering the inertia effect.The inertial effect can not be ignored when the operating condition is close to the critical point,and it can be ignored when the operating condition is far from the critical point.

关 键 词：超临界二氧化碳 干气密封 惯性效应 动态特性 临界点 

分 类 号：TB42[一般工业技术]