高超声速飞行器布雷顿循环PCHE中CO_(2)换热特性数值研究  

Numerical research on heat transfer characteristics of CO 2in PCHE of hypersonic aircraft′s Brayton cycle

作　　者：王彦红 孙文清 东明[2] 李素芬[2] 李洪伟[1] WANG Yanhong;SUN Wenqing;DONG Ming;LI Sufen;LI Hongwei(School of Energy and Power Engineering,Northeast Electric Power University,Jilin 132012,China;School of Energy and Power Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]东北电力大学能源与动力工程学院,吉林吉林132012 [2]大连理工大学能源与动力学院,辽宁大连116024

出　　处：《大连理工大学学报》2023年第4期367-376,共10页Journal of Dalian University of Technology

基　　金：国家自然科学基金资助项目(51576027);吉林省教育厅科技项目(JJKH20220100KJ)。

摘　　要：基于高超声速飞行器布雷顿循环中印刷电路板换热器(PCHE)的应用,对PCHE通道中的超临界换热进行了数值研究.阐述了热侧运行参数和冷侧运行参数对换热的影响机制.考察了热侧流体温度、流线和湍动能的分布情况.评价了热侧[火积]流、壁面[火积]流和通道综合换热系数,建立了热侧换热关联式.计算结果表明:热侧压力提高、热侧进口温度下降、冷侧进口温度减小,均导致热侧换热增强.局部高湍动能是强化换热的原因.提高热侧参数可使通道的[火积]耗散性更小.Based on the application of printed circuit heat exchanger (PCHE) in the Brayton cycle of hypersonic aircraft, numerical research on supercritical heat transfer in the PCHE channel is performed. Effect mechanisms of the hot-side and cold-side operating parameters on heat transfer are analyzed. The distributions of hot-side fluid temperature, streamline and turbulent kinetic energy are studied. The hot-side entransy flux, wall entransy flux and channel comprehensive heat transfer coefficient are evaluated. The hot-side heat transfer correlation is established. The calculation results show that increasing the hot-side pressure, decreasing the hot-side inlet temperature, or reducing the cold-side inlet temperature leads to the hot-side enhanced heat transfer. The local high turbulent kinetic energy is the reason for enhanced heat transfer. The entransy dissipation of channels is smaller at high hot-side parameter conditions.

关 键 词：印刷电路板换热器(PCHE) 超临界压力 二氧化碳 换热 [火积]流 

分 类 号：V233.5[航空宇航科学与技术—航空宇航推进理论与工程]