Dynamic characteristics of supercritical CO2 dry gas seal based on multi variables perturbation

被引：0

作者：

Jiang J. ^{[1
]}

Teng L. ^{[1
]}

Meng X. ^{[1
]}

Li J. ^{[1
]}

Peng X. ^{[1
]}

机构：

[1] College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou

来源：

Huagong Xuebao/CIESC Journal | 2021年 / 72卷 / 04期

关键词：

Actual effect; Dry gas seal; Dynamic simulation; Supercritical carbon dioxide; Turbulent flow; Variable perturbation;

D O I：

10.11949/0438-1157.20201040

中图分类号：

学科分类号：

摘要：

The dry gas seal working condition at the inlet of the supercritical CO2 compressor is near the critical point. The strong nonlinear physical properties and high Reynolds number flow make the sealing characteristics different from conventional dry gas seals. Based on the steady-state film pressure calculation model considering the real gas effect, centrifugal inertia effect, turbulent effect and choked effect, a multi variables perturbation numerical model by considering perturbed film pressure, density, viscosity, Reynolds number, turbulence coefficient and inertia coefficient for calculating dynamic characteristics of dry gas seal is established based on perturbation method. The dynamic characteristics of supercritical CO2 and N2 dry gas seals were compared and analyzed. The influences of actual fluid effects and variable perturbation models on the axial and angular dynamic characteristics coefficients of supercritical CO2 dry gas seals under different conditions were obtained. The results show that the stiffness and damping coefficient of supercritical CO2 dry gas seal are reduced by more than 50% compared with N2 dry gas seal under high frequency disturbance. Turbulent effect and real gas effect have significant influence on dynamic characteristics of dry gas seal. The calculation deviations of dynamic characteristics calculated by classical variable perturbation and ignoring turbulence coefficient perturbation are relative large under low frequency disturbance, while the prediction accuracy of the classical variable perturbation model is acceptable under high frequency disturbance. © 2021, Editorial Board of CIESC Journal. All right reserved.

引用

页码：2190 / 2202

页数：12

共 28 条

[1] Ahn Y, Bae S J, Kim M, Et al., Review of supercritical CO2 power cycle technology and current status of research and development, Nuclear Engineering and Technology, 47, 6, pp. 647-661, (2015)
[2] Thatte A, Dheeradhad A V., Coupled physics performance predictions and risk assessment for dry gas seal operating in mw-scale supercritical CO2 turbine, ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition, (2016)
[3] Brun K, Friedman P, Dennis R., Foreword, ) Based Power Cycles, (2017)
[4] Li Z G, Yuan T, Fang Z, Et al., A review on dynamic sealing technology of supercritical carbon dioxide rotating machinery, Thermal Turbine, 48, 3, pp. 166-174, (2019)
[5] Conboy T M., Real-gas effects in foil thrust bearings operating in the turbulent regime, Journal of Tribology, 135, 3, (2013)
[6] Qin K, Gollan R J, Jahn I H., Application of a wall function to simulate turbulent flows in foil bearings at high rotational speeds, Tribology International, 115, pp. 546-556, (2017)
[7] Guenat E, Schiffmann J., Real-gas effects on aerodynamic bearings, Tribology International, 120, pp. 358-368, (2018)
[8] Fairuz Z M, Jahn I., The influence of real gas effects on the performance of supercritical CO2 dry gas seals, Tribology International, 102, pp. 333-347, (2016)
[9] Shen W, Peng X D, Jiang J B, Et al., Analysis on real effect of supercritical carbon dioxide dry gas seal at high speed, CIESC Journal, 70, 7, pp. 2645-2659, (2019)
[10] Xu H J, Song P Y, Mao W Y, Et al., Analysis on inertia effect of carbon dioxide dry gas seal at high speed and pressure under laminar condition, CIESC Journal, 69, 10, pp. 4311-4323, (2018)

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