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research-article

Numerical simulation of supercritical carbon dioxide critical flow in the nozzle tube

[+] Author and Article Information
Zhou Yuan

College of Physical Science and Technology Sichuan University, Sichuan University Yi Huan Road Chengdu City Sichuan Province China
zhouyuan1911@126.com

Wang Yangle

College of Physical Science and Technology Sichuan University, Sichuan University Yi Huan Road Chengdu City Sichuan Province China
214927822@qq.com

Chen Jingtan

College of Physical Science and Technology Sichuan University, Sichuan University Yi Huan Road Chengdu City Sichuan Province China
7424739538@qq.com

Xia Zhaoyang

College of Physical Science and Technology Sichuan University, Sichuan University Yi Huan Road Chengdu City Sichuan Province China
624614923@qq.com

Junfeng Wang

Nuclear Power Institute of China, Chang Shun Road 1 NO.328 Shuang Liu District Chengdu City Sichuan Province China
walojef@163.com

1Corresponding author.

ASME doi:10.1115/1.4037896 History: Received April 20, 2017; Revised August 15, 2017

Abstract

The Supercritical Carbon Dioxide (S-C ) Brayton gas turbine cycle has been studied as an effcient and cost effective option for advanced power systems. One major safety issue for any power cycle is a pipe break and the associated discharge of the working fluid and subsequent decrease in system pressure. In this paper, a S-C critical flow in the nozzle tube is analyzed numerically by FLUENT 15.0. The Redlich-Kwong real gas equation is selected to calculate carbon dioxide density and the standard K-epsilon turbulence model is selected. Experimental data (Guillaume et al., 2014) are used as a benchmark to examine the capability of the current approach. Compared with experimental data, the simulation results overestimate the critical mass flux; the error range is between 15% and 25%. The simulation results show that as L/D ratio increases, critical mass flow decreases. As stagnation temperature increases, critical mass flow decreases. The complex thermal hydraulic behavior in the nozzle tubes is analyzed. Three flow patterns in the nozzle tube during transient critical flow are obtained and discussed. From inlet to outlet of the tube, C may undergo the following phases in turn:1)supercritical phase;2)supercritical phase - gas phase;3)supercritical phase - gas phase - liquid phase. The simulation results are also helpful for further experimental and theoretical research.

Copyright (c) 2017 by ASME
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