高真空多层绝热结构的真空失效传热研究  

Research of heat transfer of new type composite high vacuum multi-layer thermal insulation structure under the condition of vacuum failure

作　　者：丁昌 白鹏飞 孙浩 Ding Chang;Bai Pengfei;Sun Hao(College of Power and Engineering,Zhengzhou University of Light Industry,Zhengzhou 450002,China)

机构地区：[1]郑州轻工业大学能源与动力工程学院,郑州450002

出　　处：《低温与超导》2023年第4期86-92,共7页Cryogenics and Superconductivity

基　　金：河南省产学研项目(22104010001);郑州轻工业大学博士基金(13501050005)资助。

摘　　要：针对两种高真空多层绝热结构进行传热性能研究,并与工程中常用绝热结构进行对比分析,对三种不同绝热结构分别以甲烷与空气作为破空气体进行抗热冲击性能试验。研究表明,相对于其他非冷凝气体,甲烷这类冷凝气体进入绝热夹层后会出现冷凝现象,冷凝现象会增加夹层内传热。气凝胶+纤维隔热纸+铝箔(新型绝热结构1)相对植物纤维纸+铝箔(新型绝热结构2)在同一真空失效气源条件下,能够有效降低气体蒸发速率峰值,降低程度约为25%至40%,降低真空失效后夹层漏热量约为30%至55%,且能够有效延缓气体峰值出现的时间。Two high vacuum multi-layer adiabatic structures were studied for heat transfer performance and compared with those used in engineering.Three different adiabatic structures were tested for thermal shock resistance,with methane and air as the breaking gas.The study shows that,compared with other non-condensing gases,methane as a condensing gas,will condense when it enters the adiabatic sandwich.The condensation phenomenon will increase the heat transfer within the sandwich.Aerogel+fiber insulation paper+aluminum foil(new insulation structure 1)can effectively reduce the peak gas evaporation rate by about 25%to 40%and reduce the sandwich heat leakage after vacuum failure by about 30%to 55%compared with plant fiber paper+aluminum foil(new insulation structure 2)under the same vacuum failure gas source condition,and can effectively delay the time of peak gas appearance.

关 键 词：绝热结构 真空失效 气体蒸发速率 绝热夹层温度 

分 类 号：TB657[一般工业技术—制冷工程]