镓铟锡合金—航空煤油U型套管换热器的传热特性研究  

Study on Heat Transfer Characteristics of Ga-In-Sn Alloy-aviation Kerosene U-shaped Casing Pipe Heat Exchanger

作　　者：刘彭华 鲍泽威[1] 王仁婷 Liu Penghua;Bao Zewei;Wang Renting(College of Chemistry,Sichuan University,Chengdu,Sichuan 610065,China)

机构地区：[1]四川大学化工学院,四川成都610065

出　　处：《化工设备与管道》2023年第1期34-42,共9页Process Equipment & Piping

基　　金：四川省工业资金发展项目(2018CD00259)。

摘　　要：以液态镓铟锡合金作为冷却剂的换热方案有可能成为解决发动机燃烧室壁面温度过高的优良方案。液态镓铟锡合金在吸收燃烧室壁面的热量后需通过换热器将热量传递给飞机上的燃油,燃油在换热过程中伴随着裂解反应。对镓铟锡合金-航空煤油U型套管换热器内航空煤油的裂解与换热特性过程进行研究。研究结果表明:与不考虑裂解反应相比,考虑裂解反应的换热过程的热侧流体出口温度降低了14.39K,冷侧流体出口温度降低了5.85K,传热量增加了28.9W。其出口温度降低,同时传热量增加是由于裂解反应提供的额外的化学热沉。RP-3入口温度、RP-3入口流量、镓铟锡合金入口温度、镓铟锡合金入口流量对两侧流体的出口温度和传热量均有显著的影响。RP-3流量增加的情况下裂解反应对传热起增强作用;镓铟锡合金流量增加时,裂解反应对传热起恶化作用。裂解反应引起的传热强化与恶化相伴相随。与此同时发现换热器内高流速流体区域沿着流动方向逐渐向管外侧偏移,管内温度分层现象显著,流场分布的不均性明显。The heat exchange scheme using liquid gallium indium tin alloy as coolant is likely to be an excellent scheme to solve the problem of high wall temperature of engine combustion chamber.After absorbing the heat from the combustion chamber wall,the liquid gallium indium tin alloy needs to transfer the heat to the fuel on the aircraft through the heat exchanger. The fuel is accompanied by cracking reaction during the heat exchange process. In this paper, the pyrolysis and heat transfer characteristics of aviation kerosene in Ga-In-Sn alloy-aviation kerosene U- shaped casing pipe heat exchanger are studied. The results show that: Compared with the heat transfer process without considering the cracking reaction, the outlet temperature of the hot side fluid was reduced by 14.39 K, the outlet temperature of the cold side fluid was reduced by 5.85 K, and the heat transfer is increased by 28.9 W. The decrease of outlet temperature and the increase of heat transfer were due to the additional chemical heat sink provided by the cracking reaction. RP-3 inlet temperature, RP-3 inlet flow, Ga-In-Sn alloy inlet temperature and Ga-In-Sn alloy inlet flow had significant effects on the outlet temperature and heat transfer of the fluid on both sides. With the increase of RP-3 flow rate, the cracking reaction enhanced the heat transfer;When the flow rate of Ga-In-Sn alloy increases, the cracking reaction worsed the heat transfer. The heat transfer enhancement caused by cracking reaction was accompanied by deterioration. At the same time, it was found that the high velocity fluid region in the heat exchanger gradually shifted to the outside of the tube along the flow direction, the temperature stratification in the tube was significant, and the non-uniformity of the flow field was obvious.

关 键 词：航空煤油 U型套管换热器 裂解反应 流动换热 

分 类 号：V231[航空宇航科学与技术—航空宇航推进理论与工程]