증기냉각쉴드 구조에 따른 액화수소 탱크 단열성능에 관한 수치해석 연구

Abstract

The present study investigates the influence of the vapor-cooled shield(VCS) tube structure on the thermal insulation performance of VCS through numerical simulation. Three-dimensional models of VCS are developed with different tube diameters, tube numbers, and multi-layer insulation(MLI) equivalent thermal conductivities. The model includes VCS tube diameters ranging from 4 to 12 mm, tube numbers varying from 2 to 8, and MLI equivalent thermal conductivity ranging from 1×10-5 to 1×10-4 W/m·K. By comparing the thermal insulation performance of VCS through these simulation results, the design trend for a relatively more excellent thermal insulation structure can be obtained, providing a design reference basis for the actual production of VCS. From the results, compared with the model without VCS, the reduction of intrusion heat flux increases from a minimum of 31.64 % to a maximum of 66.55 % as the heat transfer area increases with the addition of the VCS tube diameter and the tube number. In addition, the thermal insulation performance of the insulation layer increases with the reduction of the thermal conductivity of the MLI layer. Moreover, the trend of the intrusion heat flux density for the tube diameter and number is unaffected.