板式扩散焊矩形微通道换热器中S-CO_(2)流动与传热特性的数值模拟  

Numerical Simulation of Flow and Heat Transfer Characteristics of S-CO_(2) in Plate Diffusion Welded Rectangular Micro-channel Heat Exchanger

作　　者：李洪 任燕 章立新[1,2] 高明 刘婧楠[1,2] 杨其国 LI Hong;REN Yan;ZHANG Lixin;GAO Ming;LIU Jingnan;YANG Qiguo(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering,Shanghai 200093,China)

机构地区：[1]上海理工大学能源与动力工程学院,上海200093 [2]上海市动力工程多相流动与传热重点实验室,上海200093

出　　处：《动力工程学报》2022年第12期1174-1182,共9页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(51976127);上海市科技计划资助项目(20060502000,20YF1431300)。

摘　　要：基于加工工艺便捷高效的板式扩散焊矩形微通道换热器,建立了以冷热直通道换热单元为研究对象的数学物理模型,研究了超临界二氧化碳(S-CO_(2))在不同边界条件和通道结构下的流动与传热特性。结果表明:随着雷诺数(Re)的增大,冷热直通道内的湍流增强,传热性能得到提升,流动摩擦阻力系数减小;与无格栅时矩形通道相比,格栅水平设置在矩形通道两侧时的扰流效果和传热性能最优,综合传热增强因子(PEC)相对最高,但与半圆形直通道相比其PEC仍有待进一步提高。Based on a plate diffusion welded rectangular micro-channel heat exchanger with convenient and efficient processing technology, a mathematic-physical model of the heat transfer unit of hot and cold straight channels was established, and the flow and heat transfer characteristics of supercritical carbon dioxide(S-CO_(2)) under different boundary conditions and different channel structures were investigated. Results show that with the increase of Reynolds number(Re), the turbulences in the hot and cold straight channels enhance, the heat transfer performance improves, and the frictional resistance coefficient of the flow decreases. Compared with the flow and heat transfer characteristics in the rectangular channel with no grid, the turbulence effect and heat transfer characteristic are the best when the grid is horizontally arranged on both sides of the channels, and the comprehensive heat transfer enhancement factor(PEC) of the channel is relatively high. However, the PEC still needs to be further improved compared with that of the semi-circular channel.

关 键 词：板式扩散焊矩形微通道 换热器 S-CO_(2) 传热特性 摩擦阻力 综合传热增强因子 

分 类 号：TK172[动力工程及工程热物理—热能工程]