流体机械

2019, v.47;No.559(01) 31-35+7

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口环密封对高压多级离心泵临界转速的影响
Influence of Sealing Ring on Critical Speed of High Pressure Multistage Centrifugal Pump

朱慈东;李志鹏;张森;何备荒;丁垣利;
Zhu Cidong;Li Zhipeng;Zhang Sen;He Beihuang;Ding Yuanli;Changsha Univercity of Science and Technology;TANE Pumps;

摘要(Abstract):

高压多级泵单级扬程较高,叶轮密封环前后压差大,口环密封的等效刚度对转子湿临界转速的影响较大。在计算转子的湿临界转速时需要求解口环密封的主刚度系数。使用Pro E件计算得出密封处的流场力,进而求解密封环的主刚度系数,并用轴承刚度定义进行验证。利用ANSYS-Workbench对高压多级泵进行模态分析,对比考虑口环密封前后,转子临界转速的变化情况。结果表明:口环密封使前两阶弯振临界转速大幅增加,随着转速的增加,口环密封对临界转速的影响越来越小;口环密封降低了扭转振动的临界转速,且对第一阶扭转振动的临界转速影响较大;口环密封可以降低陀螺效应对转子临界转速的影响。
High pressure multi-stage pump has higher single-stage lift,higher pressure difference between the front and the back sides of the impeller seal ring,and the equivalent stiffness of the seal ring has a greater influence on the wet critical speed of the rotor. Therefore,when calculating the wet critical speed of the rotor,it is needed to calculate the main stiffness coefficient of the ring seal. The 3 D model of the impeller seal ring fluid model was built by Proe,and the flow field force of the seal was calculated by the CFX software,and thereby the main stiffness coefficient of the seal ring was solved and was verified using the definition of stiffness of bearing. The modal analysis of the high pressure multistage pump was carried out using the ANSYS-Workbench,and the changes in critical speed of the rotor before and after the sealing of the ring seal were compared. The results show that the seal ring made the bending vibration critical speed of top two orders increase greatly,and as the speed increased,the effect of the ring seal on the critical speed became smaller and smaller;the ring seal reduced the critical speed of torsional vibration,especially the effect on the critical speed of the first order torsional vibration was greater. The ring seal can reduce the influence of gyroscopic effect on the critical speed of the rotor.

关键词(KeyWords): 流固耦合作用;等效刚度;模态分析;临界转速
fluid structure interaction;equivalent stiffness;modal analysis;critical speed

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作者(Author): 朱慈东;李志鹏;张森;何备荒;丁垣利;
Zhu Cidong;Li Zhipeng;Zhang Sen;He Beihuang;Ding Yuanli;Changsha Univercity of Science and Technology;TANE Pumps;

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