摘要
建立了实际工作环境中航空电子设备相变储热器单元的二维模型,综合考虑了自然散热和热辐射的复合热边界对相变储热冷却能力的影响。在航空电子模块的三种典型功耗下,分析了相变储热单元底面温度上升至设定的目标温度的时间,以及在此时间段内自然散热、热辐射、相变储热和显热储热的热流密度占输入功耗的瞬时比率和时均比率的变化规律。研究结果表明:随着输入功耗下降,相变储热单元底面温度上升至设定的目标温度的时间快速增长,自然散热和热辐射的占比加速上升,同时相变储热占比下降。在该时间段内,自然散热和热辐射的热流密度可近似认为随时间线性增长。以上结论可为设计航空电子模块相变储热器提供有益的指导。
In this paper,a two dimensional model of phase change heat storage device used in avionics equipment was developed taking the effect of natural convection heat transfer and thermal radiation into consideration.The time period from initial time to the time when the base temperature raised to a setting temperature was analyzed to get insight into the rule of temperature raising under the mixed thermal boundary.Also the transient ratios and time-average ratios regarding to the natural convection heat transfer,the thermal radiation,the phase change heat storage and the sensible heat were examined during this time period.It is found that,with the decrease of the input power,the above-mentioned time period prolongs significantly,the natural convection heat transfer and the thermal radiation increase rapidly,whereas the heat storage with PCM decreases.During that time period,the natural convection heat transfer and the thermal radiation can be simplified as increasing in a positive proportional pattern.These conclusions could provide a guidance for engineers in designing phase change heat storage device in avionics module.
作者
吴波
张丰华
赵亮
杨明明
Wu Bo;Zhang Fenghua;Zhao Liang;Yang Mingming(Xi’an Aeronautics Computing Technique Research Institute AVIC,Xi'an 710068,China)
出处
《低温与超导》
CAS
北大核心
2020年第11期84-89,104,共7页
Cryogenics and Superconductivity
基金
装备预先研究项目(JZX6Y201901010029)资助。
关键词
航空电子
冷却
相变储热器
复合热边界
Avionics
Cooling
Phase change material(PCM)
Mixed thermal boundary
