多层材料/气冷屏传热二维模型与绝热性能OA北大核心CSTPCD

To provide more accurate guidance for the design of multi-layer insulation(VD-MLI)/vapor-cooled shield(VCS)composite insulation structures of cryogenic storage tanks,a two-dimensional VD-MLI/VCS model was established,focusing on the influence of temperature rise of the cryogenic gas in VCS on the spatial distribution of insulation performance.A comparative analysis was conducted on the predictive ability of traditional one-dimensional model and newly constructed two-dimensional model,as well as the heat transfer law of composite insulation structures.The results show that the heat leak reaches the minimum value when VCS is arranged at 16th layer of VD-MLI,which is 0.11 W/m2.The one-dimensional model underestimates the heat leak of the storage tank by 9%.The cooling effect of VCS gradually weakens since the heat leak of the storage tank increases from 0.02 W/m2 to 0.23 W/m2 along the flow direction of hydrogen.The temperature field of VD-MLI/VCS insulation structure exhibits different patterns of two-dimensional distribution as the position of VCS changes,resulting in inconsistent insulation performance in various parts of the storage tank.It is recommended to arrange VCS within the range of 26.7%to 68.3%of the total thickness of VD-MLI.