液氢储罐中耦合蒸气冷却屏的连续变密度多层绝热的序列二次规划优化

To further optimize the insulation performance of multi-layer insulation structures applied to liquid hydrogen storage, a sequential quadratic programming algorithm was proposed to optimize the radiation shield spacing of continuous variable density multi-layer insulation coupled with vapor cooled shield (VCS). The effects of the position of the VCS, the quasi-positive transformation within the VCS and the number of VCSs on the optimal radiant screen spacing distribution and adiabatic performance were studied. The results show that the introduction of VCS causes a sudden change in the optimal spacing distribution of radiation shields at the location where the VCS is set, and the heat leakage flux density q_in after optimization can decrease by up to 36.1% compared with that before optimization. Under condition that the optimization is adopted, the introduction of para-to-ortho hydrogen conversion can achieve a maximum decrease of 28.3% in q_in. The increase in the number of VCS significantly reduces the spacing between the innermost radiation shields. When the number of VCS is increased to 2, the minimum q_in decreases by 50.4% compared to the single VCS.