哈尔滨工程大学学报Issue(3)：347-352,6.DOI:10.3969/j.issn.1006-7043.201301026
泵用不可压缩流体密封刚度系数分析
Analysis of the stiffness of the incompressible seal in pump
摘要
Abstract
To investigate the flexible support of the incompressible seal , negative stiffness characteristic was ana-lyzed .The rotor dynamic coefficients in the neck bush and the ring seal in the LNG pump were predicted by emplo-ying three-dimensional flow model , theκ-εturbulence model and numerically solving the Navier-Stokes equations . The dynamic characteristics were compared in the incompressible seals over a range of rotating speeds and between nominal clearance and twice clearance seals .Through simulating the incompressible flow , as well as analyzing and comparing the circumferential distributions of the pressure and velocity , the reasons for the negative direct stiffness in the uniform annular seal were discovered and the influences on the negative direct stiffness were also found .The results show that:for both the annular seal and the grooved seal, the direct stiffness of twice clearance seal was higher than that of the normal clearance seal , but the cross stiffness of twice clearance seal was smaller than that of the normal clearance seal .It indicated the rotor stability was improved after seal wore .The direct stiffness dropped and the cross stiffness increased with the increase of the rotating speed , which caused rotor stability reduction .In the high rotating speed condition , the annular seal with a small clearance was vulnerable to perform a characteristic of negative stiffness , which destroyed the stability of the rotor system .It is recommended that the grooved seals are applied to the pump to control the incompressible flow against leakage instead of the annular seal .关键词
动力特性/不可压缩流体密封/负直接刚度/密封腔Key words
dynamic characteristics/incompressible seal/negative direct stiffness/seal分类
通用工业技术引用本文复制引用
张盟,王晓放,徐胜利,万学丽..泵用不可压缩流体密封刚度系数分析[J].哈尔滨工程大学学报,2014,(3):347-352,6.基金项目
国家973计划资助项目（2009CB724303）；辽宁省博士启动基金资助项目（20131019）． （）
