小通道内碳氢化合物极限热流密度实验研究  

An Experimental Study on Ultimate Heat Flux of Hydrocarbon in Mini-Channels

作　　者：杨竹强[1] 金禛 刘峰[1] 张巧玲 高天泽 康桥 苗瑞璞 张博[1] YANG Zhuqiang;JIN Zhen;LIU Feng;ZHANG Qiaoling;GAO Tianze;KANG Qiao;MIAO Ruipu;ZHANG Bo(School of Energy and Power Engineering, Dalian University of Technology, Dalian, Liaoning 116024, China;College of Water Resources and Hydroelectric Engineering, Xi’an University of Technology, Xi’an 710048, China;Beijing Power Machinery Institute, Beijing 100074, China)

机构地区：[1]大连理工大学能源与动力学院,辽宁大连116024 [2]西安理工大学水利水电学院,西安710048 [3]北京动力机械研究所,北京100074

出　　处：《西安交通大学学报》2022年第3期65-74,共10页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(51606030,51906201);国家科技重大专项资助项目(J2019-Ⅲ-0021-0065)。

摘　　要：针对新一代发动机热防护所采用的再生主动冷却技术中的传热问题,对超临界压力下碳氢化合物的传热特性进行了实验研究。利用主流温度、内壁温度、传热系数等划分指标,量化了正常传热、传热强化、传热弱化3个阶段的区间划分;定义超临界压力下发生传热弱化时对应的热流密度为极限热流密度,对其影响因素进行研究,发现压力越高、质量流量越大、加热入口温度越低,极限热流密度越高;采用拟沸腾数对极限热流密度进行表征,并发现拟沸腾数与入口温度和压力相关,与雷诺数弱相关;基于实验数据,采用量纲分析方法得到综合影响因素下极限热流密度的预测公式,数据预测偏差在±10%以内。该研究结果可用于预测传热弱化现象的发生,为飞行器换热结构设计提供理论依据,进而保证飞行器整体的安全运行。Heat transfer characteristics of hydrocarbons under supercritical pressure are experimentally studied to solve the heat transfer problem of regenerative active cooling technology used in the thermal protection of a new generation engine.The bulk temperature,inner wall temperature and heat transfer coefficient are used as indicators to quantify the interval division of three stages:normal heat transfer,heat transfer enhancement,and heat transfer weakening.The heat flux corresponding to heat transfer weakening under supercritical pressure is defined as the ultimate heat flux(qc),and its variation law is studied.It is found that the higher the pressure,or the greater the mass flow,or the lower the heating inlet temperature,the higher the ultimate heat flux.The pseudo-boiling number(SBo)is used to characterize qc,and it is found that SBo is correlated with the inlet temperature and pressure,and is weakly correlated with the Reynolds number.Based on the experimental data,the dimensional analysis method is used to obtain a prediction formula of qc,and the data prediction deviation is within±10%.The research result can be used to predict the occurrence of heat transfer weakening.

关 键 词：超临界压力 传热特性 碳氢化合物 极限热流密度 

分 类 号：TK24[动力工程及工程热物理—动力机械及工程]