当前位置: X-MOL 学术Ind. Lubr. Tribol. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Ultra-high-speed TEHL characteristics of T-groove face seal under supercritical CO2 condition
Industrial Lubrication and Tribology ( IF 1.6 ) Pub Date : 2021-03-04 , DOI: 10.1108/ilt-11-2020-0415
Delei Zhu , Shaoxian Bai

Purpose

The purpose of this paper is to acquire sealing properties of supercritical CO2 (S-CO2) T-groove seal under ultra-high-speed conditions by thermo-elastohydrodynamic lubrication (TEHL) analysis.

Design/methodology/approach

Considering the choked flow effect, the finite difference method is applied to solve the gas state equation, Reynolds equation and energy equation. The temperature, pressure and viscosity distributions of the lubricating film are analyzed, and sealing characteristics is also obtained.

Findings

The face distortions induced by increasing rotational speed leads to the convergent face seal gap. When the linear velocity of rotation exceeds 400 m/s, the maximum temperature difference of the sealing film is approximately 140 K, and the viscosity of CO2 is altered by 17.80%. Near the critical temperature point of CO2, while the seal temperature increases by 50 K, the opening force of the T-groove non-contact seal enhances by 20% and the leakage rate declines by 80%.

Originality/value

The TEHL characteristics of the T-groove non-contact seal are numerically analyzed under ultra-high-speed, considering the real gas effect and choked flow effect. In the supercritical conditions, the influence of rotational speed, seal temperature, seal pressure and film thickness on sealing performance and face distortions is analyzed.



中文翻译:

超临界CO2条件下T形槽端面密封的超高速TEHL特性

目的

本文的目的是通过热弹性流体动力润滑(TEHL)分析获得超临界条件下超临界CO 2(S-CO 2)T形槽密封的密封性能。

设计/方法/方法

考虑到节流效应,采用有限差分法求解气态方程,雷诺方程和能量方程。分析了润滑膜的温度,压力和粘度分布,并获得了密封特性。

发现

转速增加引起的端面变形导致收敛的端面密封间隙。当旋转的线速度超过400m / s时,密封膜的最大温差约为140K,并且CO 2的粘度改变了17.80%。在CO 2的临界温度点附近,当密封温度增加50 K时,T槽非接触密封的打开力增加20%,泄漏率降低80%。

创意/价值

考虑到实际气体效应和节流效应,在超高速下对T型槽非接触式密封件的TEHL特性进行了数值分析。在超临界条件下,分析了转速,密封温度,密封压力和膜厚对密封性能和表面变形的影响。

更新日期:2021-03-04
down
wechat
bug