Analysis on inertia effect of carbon dioxide dry gas seal at high speed and pressure under laminar condition

被引：0
|
作者：
Xu H. [1 ,2 ]
Song P. [1 ,2 ]
Mao W. [2 ]
Deng Q. [2 ]
Sun X. [2 ]
机构：
[1] Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, Yunnan
[2] Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming, 650500, Yunnan
来源：
Huagong Xuebao/CIESC Journal | 2018年 / 69卷 / 10期
关键词：
Carbon dioxide; Inertia effect; Laminar; Numerical analysis; Real gas; Spiral groove dry gas seal;
D O I：
10.11949/j.issn.0438-1157.20180418
中图分类号：
学科分类号：
摘要：
The real gas property of carbon dioxide was expressed by third term virial equation, both the choked flow effect and the variation of gas viscosity were taken into account, the influence of inertia effect on the steady characteristics of pumping-inward and pumping-outward spiral groove dry gas seal (S-DGS) under laminar condition have been numerically investigated by referencing the theory of gas thrust bearing which considering inertia effect. Compared with the assumptions of ideal gas and inertialess, the results show that inertia effect induce a stronger influence on carbon dioxide real gas S-DGS. Inertia effect reduced leakage rate and opening force of pumping-inward S-DGS but the opposite was obtained for pumping-outward S-DGS. Taken pumping-inward SDGS as example, the influence of inertia effect on the steady characteristics of carbon dioxide S-DGS (i.e. leakage rate and opening force ) gradually enhanced with the increase of sealed gas pressure and rotational speed, while it being weaken with increased gas film thickness. The relative deviations of leakage rate and opening force caused by the inertia effect are 62.21% and 35.03% when sealed gas pressure is 10 MPa, gas film thickness is 3μm and rotational speed is 20000 r•min1, and the critical entrance pressure which causes a choked flow at exit is improved. In addition, the closer the temperature of carbon dioxide is to its critical temperature, the more obvious the inertial effect is. © All Right Reserved.
引用
收藏
页码：4311 / 4323
页数：12
相关论文
共 33 条
  • [1] Zhao H., Deng Q.H., Huang W.T., Et al., Numerical investigation on the blade tip two-phase flow characteristics of a supercritical CO<sub>2</sub> centrifugal compressor, Journal of Engineering Thermophysics, 36, 7, pp. 1433-1436, (2015)
  • [2] Kimballl K.J., Clementoni E.M., Supercritical carbon dioxide brayton power cycle development overview, ASME Turbo Expo 2012: Turbine Technical Conference and Exposition, pp. 931-940, (2012)
  • [3] Thatte A., Dheeradhada V., Coupled physics performance predictions and risk assessment for dry gas seal operating in MW-Scale supercritical CO<sub>2</sub> turbine, ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition, (2016)
  • [4] Li P.J., Hao X.L., Song M.C., Et al., The design and application of a supercritical carbon dioxide turbo-generator, Ship Science and Technology, 39, 9, pp. 111-116, (2017)
  • [5] Liu Y., Shen X., Xu W., Numerical analysis of dynamic coefficients for gas film face seals, Journal of Tribology, 124, 4, pp. 743-754, (2002)
  • [6] Thatte A., Zheng X., Hydrodynamics and sonic flow transition in dry gas seals, Proceedings of the ASME Turbo Expo, (2014)
  • [7] Gupta R.S., Sharma L.G., Centrifugal inertia effects in misaligned radial face seals, Wear, 129, 2, pp. 319-332, (1989)
  • [8] Koga T., Fujita T., The hydrostatic noncontact seal including fluid inertia effect, ASLE Transactions, 29, 1, pp. 35-42, (1986)
  • [9] Wang M.H., Dong X., FEM analysis of pressure field of oil-film in controlled-film mechanical seal, Lubrication Engineering, 6, pp. 12-16, (1993)
  • [10] Peng X.D., Gu Y.Q., The effects of coning face and fluid inertia on the performance of mechanical face seals at various phase states, Journal of China University of Petroleum (Edition of Natural Science), 14, 3, pp. 62-70, (1990)
1234