中国电机工程学报2025，Vol.45Issue(14)：5392-5401,中插5,11.DOI:10.13334/j.0258-8013.pcsee.241265
超高参数CO2在水平管内流动传热数值模拟研究
Numerical Simulation of Flow Heat Transfer of Ultra-high Parameter CO2 in Horizontal Tubes
摘要
Abstract
Supercritical CO2 forced convection heat transfer has been extensively studied;however,the scope of research remains limited,and the understanding of its underlying principles and mechanisms is still incomplete.In this paper,the heat transfer characteristics of high-parameter supercritical CO2 in a horizontal tube with an inner diameter of 8 mm are investigated by numerical simulation.The mechanism of heat transfer deterioration in horizontal tubes is explained based on the pseudo-boiling theory.The supercritical distribution of working fluid three regimes in tubes in different sections is obtained,and the influence of different heat flux and pressure on heat transfer is discussed.The results show that increasing the inlet temperature can reduce the temperature difference between top wall and bottom wall heat transfer and restrain the deterioration of heat transfer.The heat transfer in the tube deteriorates as the increased thickness of the vapor-like film locally elevates thermal conduction resistance.The heat transfer coefficient decreases with the increase of heat flux.Increasing pressure can significantly enhance the heat transfer in tubes and restrain the deterioration of heat transfer.Finally,the simulation results are compared with the classical single-phase turbulent heat transfer correlation and the two-phase-like heat transfer correlation.It is found that the Simulated values and traditional formula calculation of heat transfer coefficient h/hDB value deviates from 1 in the two-phase-like(TPL)region,and the h/hDB value is closer to 1 with increasing distance from the TPL region.The two-phase-like heat transfer correlation can better predict the heat transfer coefficient of supercritical boiling dryness x between 0 and 1,and the Simulation value and Cheng formula calculation of heat transfer coefficient h/hc deviation is within±30%.The research results of this paper are of great significance to the safe and stable operation of supercritical CO2 power generation systems,the design of heat exchanger and the prediction of heat transfer coefficient in practical engineering applications.关键词
高参数/超临界CO2/流动传热/数值模拟Key words
high parameter/supercritical CO2/flow heat transfer/numerical simulation分类
能源科技引用本文复制引用
于博文,徐进良..超高参数CO2在水平管内流动传热数值模拟研究[J].中国电机工程学报,2025,45(14):5392-5401,中插5,11.基金项目
国家自然科学基金项目(52130608,51821004). Project Supported by National Natural Science Foundation of China(52130608,51821004). （52130608,51821004）
