Flow field and steady performance of supercritical carbon dioxide dry gas seal based on turbulence model

被引：0
作者：
Yan R. [1 ]
Ding X. [1 ]
Xu J. [1 ]
Hong X. [2 ]
Bao X. [2 ]
机构：
[1] College of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou
[2] Chengdu Yitong Seal Co.,Ltd., Chengdu
来源：
Huagong Xuebao/CIESC Journal | 2021年 / 72卷 / 08期
关键词：
Centrifugal inertia force effect; Choked flow; Dry gas seal; Real gas effect; Supercritical carbon dioxide; Turbulence effect;
D O I：
10.11949/0438-1157.20210219
中图分类号：
学科分类号：
摘要：
In order to explore the influence of turbulence effect on the performance of S-CO2 dry gas seal, the spiral groove dry gas seal was taken as the research object. The Reynolds equation considering centrifugal inertia force effect was cited,the Ng-Pan turbulence coefficient expression was selected,and the real physical properties of carbon dioxide were calculated by using software REFPROP. Then, according to the universal energy equation, the simplified energy equation of the compressible fluid was established by introducing the average velocity including the turbulence effect and the centrifugal inertia force effect. By coupling the Reynolds equation and the simplified energy equation, the influence of the turbulence effect on the sealing performance under different working conditions and average film thickness was analyzed and discussed. The research has shown that the turbulence effect causes significant changes in the pressure and temperature distribution in the gas film flow field, hich cannot be ignored when calculating the flow field. Under different inlet pressure and inlet temperature, the opening force and leakage rate in turbulence show the same trend as that in laminar flow. Under different mean film thicknesses, the opening force after considering the turbulence effect shows a different variation rule from laminar flow, while the leakage rate shows the same variation trend as laminar flow. Under different inlet pressure, inlet temperature and average film thickness, the opening force and leakage rate in turbulent flow are lower than that in laminar flow, and the difference between the two flow states increases with the increase of inlet pressure, inlet temperature and average film thickness. At different rotational speeds, the opening force and leakage rate in turbulent flow show different trends from that in laminar flow. The results provide support for further research on the effect of turbulence on S-CO2 dry gas seal. © 2021, Chemical Industry Press Co., Ltd. All right reserved.
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页码：4292 / 4303
页数：11
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