转子涡动工况下螺旋槽液膜密封性能研究  

Performance of Spiral Groove Liquid Film Seal under Rotor Whirling Condition

作　　者：孙鑫晖[1] 王明洋 刘怀顺 王增丽[1] 郝木明[1] 力宁 袁俊马 翁泽文 SUN Xinhui;WANG Mingyang;LIU Huaishun;WANG Zengli;HAO Muming;LI Ning;YUAN Junma;WENG Zewen(College of New Energy,China University of Petroleum(East China),Qingdao Shandong 266580,China;AECC Hunan Aviation Powerplant Research Institute,Zhuzhou Hunan 412002,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]中国航发湖南动力机械研究所,湖南株洲412002

出　　处：《润滑与密封》2022年第3期16-23,共8页Lubrication Engineering

基　　金：国家重点研发计划项目(2020YFB2010000);国家自然科学基金项目(51975585);中国航发湖南动力机械研究所实验室开放基金项目(KY-1003-2020-0040)。

摘　　要：基于转子在临界转速下的涡动特性,分析转子涡动的轴心运动轨迹。由于动环圆心运动轨迹追随转子,故以动环圆心的圆形运动轨迹为研究点,建立动环偏心的液膜区域模型。采用有限差分法对广义雷诺方程进行离散,通过SOR迭代方法对离散方程进行求解,得到液膜密封端面压力分布,并探讨动环偏心距对液膜开启力、摩擦扭矩、泄漏量以及空化率等液膜密封性能参数的影响规律。结果表明:随着偏心距的增大,内径开槽的密封环槽区面积减少,导致动压效应降低,使密封端面压力呈现出不对称分布的结果;液膜开启力和摩擦扭矩由于密封环表面压力降低且分布不均匀都呈现出下降的趋势;泄漏量随偏心距的增加有下降的趋势,而空化率随着偏心距增加呈现出先上升后下降的规律。Based on the whirling characteristics of the rotor at critical speed,the whirling trajectory of the rotor was analyzed.Because the rotating track of the center of the rotating ring follows the rotor,the model of the liquid film region with eccentric rotating ring was established based on the circular moving track of the center of the moving ring.The finite difference method was used to discretize the generalized Reynolds equation,and the SOR iterative method was used to solve the discrete equation to obtain the pressure distribution on the end face of the liquid film seal.The influence of the eccentricity of the rotating ring on the performance parameters of the liquid film seal,such as the liquid film opening force,friction torque,leakage and cavitation rate,was discussed.The results show that with the increase of eccentricity,the groove area of the inner diameter grooved seal ring decreases,which leads to the decrease of dynamic pressure effect and the asymmetric distribution of seal face pressure.The opening force of liquid film and friction torque show a downward trend due to the decrease of seal ring surface pressure and uneven distribution.The leakage has a downward trend with the increase of eccentricity,while the cavitation rate increases first and then decreases with the increase of eccentricity.

关 键 词：螺旋槽液膜密封 圆形涡动 密封性能 空化 

分 类 号：TB42[一般工业技术]