大型液氢球罐的支柱连接结构设计与性能对比研究

Design and Comparative Study on the Pillar Connection Structure for Large Liquid Hydrogen Spherical Tanks

围绕双层液氢球罐支柱连接设计,建立热-结构耦合数值模型,研究大型液氢球罐中支柱与内罐连接处应力与应变的分布规律,分析不同连接形式对其受力性能及传热性能的影响。研究表明:支柱与内罐连接部位无论采用标准规定的何种连接结构,当考虑温度载荷时,最大应力及应变均大幅增加;在四种支柱-内罐连接结构中,直圆形连接结构的最危险处应力值是最小的,该结构下的最大应力数值为331.33 MPa,而直接连接结构具有最好的绝热性能,该结构下的热流密度为758.75 W·m^(-2)。由于四种连接形式均能满足应力校核条件,故从减小漏热的角度出发推荐采用直接连接结构作为支柱与内罐连接部位的连接方式。该研究结果可为大型液氢球罐支柱与内罐连接处的设计和选型提供理论指导。

A thermal structural coupling numerical model was established for the connection of the pillars in a doublelayer liquid hydrogen spherical tank.The stress and strain distribution of the connection between the pillar and the inner tank in a large liquid hydrogen spherical tank was studied,and the influence of different connection forms on its mechanical properties and heat transfer performance was analyzed.The results show that the maximum stress and strain increase significantly regardless of the connection structure between the pillar and the inner tank when considering the temperature load.Among the four types of connection structure between the pillar and inner tank,the straight circular connection structure has the least stress value at the most dangerous location,with the maximum stress value of 331.33 MPa,while the direct connection structure has the best thermal insulation performance,with a heat flow density of 758.75 W·m^(-2).Since all four connection forms can meet the stress verification conditions,it is recommended to use a direct connection structure as the connection method between the pillar and the inner tank from the perspective of reducing heat leakage.The results can provide theoretical guidance for the design and selection of the connection between the pillar and the inner tank of large liquid hydrogen spherical tank.