Research on influence of high vacuum multi-layer insulation structure on liquid helium storage tanks
In order to determine the optimal layer density for the vacuum multi-layer insulation structure of liquid helium stor-age tanks,the Lockheed model was used to study the relationship between heat flux density and layer density,and the optimal layer density was determined.On this basis,the influence of insulation layer thickness,environmental temperature,and vacu-um degree of insulation space on the insulation performance of liquid helium storage tank was explored.The results show that the optimal layer density of liquid helium storage tank is 41 layers/cm.The vacuum degree of insulation layer decreases,and the heat flux density decreases.When the vacuum degree drops to a certain value,the heat flux density almost no longer de-creases.The heat flux density is positively and negatively correlated with the environmental temperature and insulation layer thickness,respectively.When the thickness increases to a certain value,the rate of decrease in heat flux density decreases.When determining the thickness and vacuum degree of the insulation layer in practice,the consideration should be given to both economy and insulation performance.The research results can provide reference for the design of high vacuum multi-layer insulation structures for the liquid helium storage tanks.
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