Study on Adiabatic Performance and Lightweight of Airborne Liquid Hydrogen Storage Tank
It is a key solution to improve aircraft endurance to study the adiabatic performance and lightweight of airborne liquid hydrogen storage tank.In view of the specific airborne high altitude environment,this paper takes the liquid hydrogen storage tank with 1450kg liquid hydrogen as an example to compare the insulation and lightweight of the foam and cold screen composite insulation structure(SOFI/VCS)and the variable density multilayer vacuum jacket insulation structure(VD-MLI).When the adiabatic performance of the two adiabatic structures is the same and the daily evaporation rate of the storage tank is less than 4%,the weight of the adiabatic structure of the VD-MLI vacuum jacket is reduced by 2 times compared with that of the SOFI/VCS composite adiabatic structure,which is suitable for the double-bile storage tank structure.When the daily evaporation rate of the tank increases to about 6%,the weight difference between the two adiabatic structures is small.SOFI/VCS composite adiabatic structure is only about 50kg heavier than VD-MLI vacuum jacket adiabatic structure.When the daily evaporation rate of the tank is greater than 7%,the SOFI/VCS composite adiabatic structure has more advantages in lightweight.In this case,the tank should adopt the single-wall structure,and the higher the daily evaporation rate,the more obvious the lightweight advantage of the single-wall tank.By exploring the corresponding change law of adiabatic performance and weight of the two adiabatic structures,the paper provides a theoretical basis for the adiabatic structure and lightweight scheme design of aviation airborne liquid hydrogen storage tank,and lays a certain foundation for the development of efficient long-term storage technology of liquid hydrogen.
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