摘要
为进行座舱盖高空低温环境飞行疲劳试验考核,设计并搭建了采用液氮喷雾技术的小型环路结构低温环境模拟测试试验台,开展了风速以及喷射流量对系统降温速率影响的特性研究。试验测试了在液氮喷雾流量为37.2、42.4和49.3 kg/h,系统风速为2.21、4.53和6.77 m/s时,工作段温度从21℃降至-30℃时各测试面的降温特性,验证了运用液氮喷雾技术快速降温的可行性。结果表明:在相同喷雾流量下,风速越大,环路的降温速率越慢,测试面的温度均匀性越好;在相同风速下,喷雾流量越大,降温速率越快,测试面的温度均匀性越差。液氮喷雾降温能够满足座舱盖疲劳测试的低温环境要求,工作段温度场均匀性良好。本文研究可为低温环境模拟系统和大空间液氮喷雾冷却系统的设计提供参考。
To examine the canopy fatigue during low-temperature flights, a small air loop canopy fatigue test-rig using liquid nitrogen spray cooling technology was designed and developed to investigate the effects of air speed and spray flow rate on the cooling rate of the system. In the experiment, as the liquid nitrogen spray flow rates were 37.2, 42.4 and 49.3 kg/h and the air speeds were 2.21, 4.53 and 6.77 m/s, the cooling performance of each test section was tested when the system temperature decreased from 21 ℃ to-30 ℃. The results show that the high flow rate enables the cooling rate to slow down and enhances the temperature uniformity under the same injection pressure and mass flow rate. As the flow rate is constant, with the cooling rate increasing, the temperature non-uniformity of each test face is obvious when the mass flow rate increases. The liquid nitrogen system can provide a low-temperature environment and a uniformed temperature field for simulation of canopy fatigue test. The present work could be a guidance for the design of low-temperature environment simulation and large-space liquid nitrogen cooling systems.
作者
张蓓乐
陈小砖
薛绒
刘秀芳
HANG Beile;CHEN Xiaozhuan;XUE Rong;LIU Xiufang(School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo, Henan 454000, China;School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China)
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2019年第5期109-114,共6页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目(51406160)
中国博士后科学基金资助项目(2014M560773)
关键词
低温环境模拟
液氮喷雾
低温风洞
low-temperature environment simulation
liquid nitrogen spray
cryogenic wind tunnel
