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。
The dynamic characteristics of oil-gas two-phase dynamic pressure seal were studied. The oil-gas twophase 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 thermalfluid-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.
作者
李世聪
钱才富
李双喜
陈炼
LI Shicong;QIAN Caifu;LI Shuangxi;CHEN Lian(Research Center of Fluid Sealing Technology,Beijing University of Chemical Technology,Beijing 100029,China;No.712 Institute,China Shipbuilding Industry Co.,Ltd.,Wuhan 430064,Hubei,China)
出处
《化工学报》
EI
CAS
CSCD
北大核心
2020年第5期2190-2201,共12页
CIESC Journal
基金
国家重点研发计划项目(2018YFB2000800)
装备预研项目(KY4420170091)。
关键词
油气两相
动压密封
热流固耦合
动态刚度
动态阻尼
oil-gas miscible
hydrodynamic seal
thermoelastic distortion
dynamic stiffness
dynamic damping
