化工学报 ›› 2020, Vol. 71 ›› Issue (5): 2190-2201.DOI: 10.11949/0438-1157.20191026

• 表面与界面工程 • 上一篇    下一篇

油气两相动压密封动态特性的热流固耦合研究

李世聪1(),钱才富1,李双喜1(),陈炼2   

  1. 1.北京化工大学流体密封技术研究中心,北京 100029
    2.中国船舶重工集团公司第七一二研究所,湖北 武汉 430064
  • 收稿日期:2019-09-11 修回日期:2020-01-07 出版日期:2020-05-05 发布日期:2020-05-05
  • 通讯作者: 李双喜
  • 作者简介:李世聪(1992—),男,博士研究生,lishicongc@126.com
  • 基金资助:
    国家重点研发计划项目(2018YFB2000800);装备预研项目(KY4420170091)

Study of thermal-fluid-solid coupling on dynamic characteristics of oil-gas miscible backflow pumping seal

Shicong LI1(),Caifu QIAN1,Shuangxi LI1(),Lian CHEN2   

  1. 1.Research Center of Fluid Sealing Technology, Beijing University of Chemical Technology, Beijing 100029, China
    2.No. 712 Institute, China Shipbuilding Industry Co. , Ltd. , Wuhan 430064, Hubei, China
  • Received:2019-09-11 Revised:2020-01-07 Online:2020-05-05 Published:2020-05-05
  • Contact: Shuangxi LI

摘要:

研究了油气两相动压密封的动态特性。在可压缩流体雷诺方程中引入油气两相流体物性,建立油气两相流体的稳态和动态雷诺方程;考虑密封变形对流体膜的影响,采用热流固耦合方法并用有限元法进行求解;分析操作参数(油气比、转速和压差)对油气两相动压密封动态性能的影响。研究结果表明:油气两相流体的黏度较大,使密封具有更大的刚度系数、阻尼系数及更好的动态性能;密封端面变形减小了密封的刚度系数,增大了阻尼系数,且影响程度最大为16.9%和31.2%,对动态性能影响较大。高转速使刚度系数和阻尼系数增加,有利于密封的动态性能;而大压差使刚度系数增大、阻尼系数减小,不利于密封的动态性能;因此油气两相动压密封适用于高转速、低压差的油气润滑工况。

关键词: 油气两相, 动压密封, 热流固耦合, 动态刚度, 动态阻尼

Abstract:

The dynamic characteristics of oil-gas two-phase dynamic pressure seal were studied. The oil-gas two-phase Reynolds equation was established based on the Reynolds equation for compressible fluid, and the physical properties of oil-gas two-phase fluid. The effect of deformation on fluid film was considered, thus the thermal-fluid-solid coupling method was adopted and solved by finite element method. The effects of operating parameters (oil-gas ratio, rotational speed and pressure difference) on the dynamic performance of oil-gas miscible backflow pumping seal were analyzed. The results show that the viscosity of oil-gas miscible fluid is larger, which makes the seal have greater dimensionless stiffness, dimensionless damping and better dynamic characteristics. The deformation of seal ring reduces the dimensionless stiffness and increases the dimensionless damping, and the maximum influence is 16.9% and 31.2%. High speed increases the dimensionless stiffness and dimensionless damping, which is beneficial to the dynamic characteristics of the seal. While large pressure difference increases the dimensionless stiffness and decreases the dimensionless damping, which is not conducive to the dynamic characteristics. Therefore, the oil-gas miscible backflow pumping seal is suitable for oil-gas lubrication with high speed and low pressure difference.

Key words: oil-gas miscible, hydrodynamic seal, thermoelastic distortion, dynamic stiffness, dynamic damping

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