低温推进剂贮存中SOFI和MLI实验研究

根据低温推进剂长时间在轨贮存的要求,设计并搭建了绝热系统地面验证测试装置,对绝热系统的热力学性能进行测试。针对55L贮箱,采用了泡沫绝热(spray on foam insulation,SOFI)和多层绝热(multilayer insulation,MLI)结合的复合绝热系统,分别在高真空(5×10^-3Pa以上)和大气压条件下进行了验证实验(液氮作为替代工质)。贮箱外绝热系统为15m m厚泡沫绝热层和45组多层绝热时,高真空条件下液氮日蒸发率为0.77%,多层绝热层表观热导率为1.29×10^-4W/(m·K),据此折算为液氧时日蒸发率为0.55%。将高真空和大气压条件下的实验结果比较发现,泡沫绝热层所占热阻分别为总热阻的0.19%和45.14%。

Experimental Study on SOFI and MLI For Cryogenic Propellant Storage

According to the requirement of long-term on-orbit storage of cryogenic propellant,a test bed to measure the thermodynamic properties of insulation system has been designed and built.Based on an aluminum tank(55L),the composite insulation system consisting of spray on foam insulation(SOFI)and multilayer insulation(MLI)was tested with liquid nitrogen under high vacuum and atmospheric pressure conditions.With insulation system of 15 mm SOFI and 45 layers MLI.The tested daily evaporation rate of liquid nitrogen is 0.77%under high vacuum condition,and the apparent thermal conductivity of multilayer insulation is 1.29×10^?4W/(m·K).The converted value of daily evaporation rate would be 0.55%for liquid oxygen.According to the experimental results,the thermal resistance of SOFI under high vacuum and atmospheric pressure is 0.19%and 45.14%,respectively.