计入JFO边界条件的波度机械密封动态特性分析  

Analysis of Dynamic Characteristics of Wave-tilt-dam Mechanical Seals with JFO Boundary Conditions

作　　者：于博 韩磊 孙鑫晖[1] 郝木明[1] 王增丽[1] 李振涛 任宝杰 YU Bo;HAN Lei;SUN Xinhui;HAO Muming;WANG Zengli;LI Zhentao;REN Baojie(New Energy College,China University of Petroleum(East China),Qingdao Shandong 266580,China;Second Military Representative Office of PLA Rocket Force Equipment Department in Xi'an Area,Xi'an Shaanxi 710000,China;School of Mechanical and Control Engineering,Shengli College of China University of Detroleum,Dongying Shandong 257061,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]火箭军装备部驻西安地区第二军事代表室,陕西西安710000 [3]中国石油大学胜利学院机械与控制工程学院,山东东营257061 [4]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》2021年第12期58-64,共7页Lubrication Engineering

基　　金：国家重点研究计划项目(2020YFB2010000);国家自然科学基金项目(51975585)。

摘　　要：为研究微扰下的波度端面机械密封的动态特性,基于流体润滑理论和小扰动法,考虑液膜空化建立计入JFO边界条件的微扰膜压控制方程,数值求解密封端面液膜三自由度微扰下的动态刚度和阻尼系数,分析几何参数和操作参数对波度端面机械密封动态特性系数的影响规律。结果表明:随着介质压力的增大,液膜动态刚度和阻尼系数均增大,有利于提升密封动态稳定性;高转速下虽液膜动态刚度系数增大,但液膜阻尼特性变差,密封工况运行易产生失稳;随着波锥比的增大,液膜动态刚度和阻尼系数均增大;波数约为8、坝宽比约为0.25时,液膜动态刚度和阻尼系数能得到相对优化结果。In order to study the dynamic characteristics of the wave-tilt-dam mechanical seal under perturbation, based on the fluid lubrication theory and the small perturbation method, the perturbation film pressure control equation including the boundary conditions of the JFO was established considering the liquid film cavitation.The dynamic stiffness and damping coefficient of the liquid film on the seal end face under three degrees of freedom perturbation was numerically solved, and the influence of geometric parameters and operating parameters on the dynamic characteristic coefficient of the wave-tilt-dam mechanical seal was analyzed.The results show that as the medium pressure increases, the dynamic stiffness and damping coefficient of the liquid film increases, which is beneficial to improving the dynamic stability of the seal.Although the dynamic stiffness coefficient of the liquid film increases at high speed, the damping characteristic of the liquid film becomes worse, and the operation of the sealing condition is prone to instability.As the amplitude coefficient increases, the dynamic stiffness and damping coefficient of the liquid film increases.When the wave number is about 8 and the dam width ratio is about 0.25,the dynamic stiffness and damping coefficient of the liquid film can be relatively optimized.

关 键 词：波度机械密封 空化 小扰动法 动态特性系数 

分 类 号：TB42[一般工业技术]