Page 98 - 《摩擦学学报》2020年第6期

第 40 卷 第 6 期 摩 擦 学 学 报 Vol 40 No 6
2020 年 11 月 Tribology Nov, 2020

DOI: 10.16078/j.tribology.2020021

离心惯性力效应对超临界二氧化碳干气密封

流场与密封特性影响分析

*
严如奇 , 丁雪兴, 徐 洁, 俞树荣, 丁俊华
(兰州理工大学 石油化工学院，甘肃 兰州 730050)

摘 要: 为揭示离心惯性力效应对S-CO 2 干气密封流场与密封特性的影响规律，以螺旋槽干气密封为研究对象，引用
考虑离心惯性力效应的Reynolds方程，在考虑气膜真实气体效应、黏度随压力与温度双重变化的同时，基于N-S方程
与能量守恒定律，建立了绝热状态下考虑离心惯性力效应作用的能量控制方程. 然后，采用有限差分法对压力控制
方程与能量控制方程进行耦合求解，并对考虑离心惯性力效应与没有考虑离心惯性力效应下的压力分布、温度分
布以及密封特性进行了分析讨论. 研究表明：离心惯性力效应具有削弱流场内压力与温度的作用；从避免凝结流动
角度考虑，离心惯性力效应引起的温降将不利于S-CO 2 干气密封；考虑离心惯性力效应作用时，气膜开启力在不同
槽深与转速下存在最佳工况点，泄漏率随着转速的增加显著减小，而离心惯性力效应与膜厚之间没有强交互作用；
考虑离心惯性力效应作用的气膜开启力、泄漏率、出口温度均比不考虑离心惯性力效应作用的小，且这种差异随着
转速的增大而增加，而随着膜厚的变化没有改变. 这些结果为进一步研究S-CO 2 干气密封奠定了一定的理论基础.
关键词: 离心惯性力效应; 超临界二氧化碳; 干气密封; 压力方程; 能量方程
中图分类号: TH117.2 文献标志码: A 文章编号: 1004-0595(2020)06–0781–11

The Influence Analysis of Centrifugal Inertia Force Effect on the

Flow Field and Sealing Characteristics of Supercritical

Carbon Dioxide Dry Gas Seal

*
YAN Ruqi , DING Xuexing, XU Jie, YU Shurong, DING Junhua
(College of Petrochemical Engineering, Lanzhou University of Technology, Gansu Lanzhou 730050, China)
Abstract: In order to reveal the influence law of centrifugal inertia force effect on the flow field and sealing
characteristics of supercritical carbon dioxide dry gas seal, by using the spiral groove dry gas seal as the research object,
the Reynolds equation considering centrifugal inertia force effect was cited. Considering the effect of real gas effect and
viscosity of gas film with pressure and temperature changes, based on the Navier-Stokes equation and the law of
conservation of energy, the energy governing equation considering the effect of centrifugal inertia force in adiabatic state
was established. Then, the finite difference method was used to solve the pressure control equation and the energy
control equation, and the pressure distribution, temperature distribution and sealing characteristics with and without
centrifugal inertia force effect were analyzed and discussed. The research showed that the pressure and temperature in
the flow field was weakened by the centrifugal inertia force effect. From the view point of avoiding condensation flow,
the temperature drop caused by centrifugal inertia force effect was not conducive to S-CO 2 dry gas sealing. When the
centrifugal inertia force effect was considered, the opening force of the gas film had the best working point at different
depth and speed, the leakage rate decreased significantly with the increase of rotational speed, but there was no strong
interaction between the centrifugal inertia force effect and the film thickness. Taking into account the action of
centrifugal inertia force effect, the opening force, leakage rate, and outlet temperature of gas film were smaller than that

Received 7 February 2020, revised 28 May 2020, accepted 9 June 2020, available online 28 November 2020.
*Corresponding author. E-mail: yanruqima@126.com, Tel: +86-17797585293.