摘要
为了指导运载火箭低温推进剂快速加注技术研制,探析了管路预冷反环状流型稳定性对加速预冷进程的作用机制,搭建了液氮管路预冷测试平台,采用光管和微肋管开展了变工况试验研究.结果发现:当雷诺数Re=5000时,微肋管可节约预冷耗时达60%,光管预冷最大换热热流为22 kW/m^(2),微肋管预冷最大热流达45 kW/m^(2).此外,微肋管预冷过程中管壁近似线性降温,微肋不会显著增大流动阻力.微肋管强化预冷的机理在于微肋结构可在反环状流气膜层内诱发径向分速度,对气液界面产生冲击,促使气液界面波动或液体撕裂,进而导致液体与壁面更早发生接触换热.当入口流量较高时,推荐采用肋间距较大的微肋管,在确保加速预冷的同时减小流动阻力.
To guide the development of cryogenic propellant rapid filling technology for launch vehicle,the mechanism of inversed annular flow pattern stability on accelerating pipeline chill-down progress was explored.A cryogenic chill-down test platform was established to evaluate the performance of micro-fin tube by comparing quenching behaviors of straight tube and micro-fin tube cases.It was found that adopting micro-fin tube could reach the time cost by over 60%.In the smooth tube case,the highest heat flux was about 22 kW/m^(2).Comparatively,the highest heat flux in the micro-fin tube case even reached about 45 kW/m^(2).Moreover,in the micro-fin tube case,the wall temperature appeared an approximately-linear decreasing tendency in the whole process.The mechanism of micro-fin tube is that a radial velocity component could be induced by introducing the micro-fin structure,and this radial strike acts on the liquid-vapor interface directly,bringing about an interface fluctuation or interface breakup,so that an earlier liquid-wall contact could be caused.Moreover,when employing a high inlet flow rate condition,a micro-fin tube with large fin interval should be suggested since the flow resistance could be reduced remarkably on the premise of heat transfer enhancement.
作者
王磊
程诚
李卓伦
厉彦忠
WANG Lei;CHENG Cheng;LI Zhuolun;LI Yanzhong(Institute of Refrigeration and Cryogenic Engineering,Xi’an Jiaotong University,Xi’an 710049,China;Shanghai Institute of Space Propulsion,Shanghai Engineering Research Center of Space Engine,Shanghai 201112,China)
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2024年第1期1-7,共7页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(51976151)
上海市科学技术委员会课题(17DZ2280800)。
关键词
低温预冷
反环状流
快速加注
沸腾换热
微肋管
cryogenic quenching
inverse annular flow
fast fueling
boiling heat transfer
micro-fin pipe
