立式低温绝热气瓶颈管传热的数值模拟与试验分析

Numerical simulation and experimental analysis of heat transfer through neck tube into vertical cryogenic insulated cylinders

对自然排放条件下颈管的共轭传热模型和稳态导热模型进行数值模拟,模拟结果显示两种模型的颈管壁面温度分布规律一致。通过液氮蒸发法的试验对导热模型的模拟方法进行验证,试验结果略低于数值模拟结果,但与共轭传热模型和稳态导热模型吻合程度良好。稳态导热模型的误差略大于共轭传热模型,但对低温气瓶颈部计算选择稳态导热模型精度已经足够,且方法简单。

Conjugate convective-conductive heat transfer （CHT） model between wall and the cold va- por and steady heat conduction （SHC） in conditions of natural discharge were numerically investigated. Simulation results showed the same distribution rule of the wall temperature of neck tube for the two models. Also a liquid nitrogen boil-off method was adopted in experiments to validate the result of numerical simula- tion. These values from experiments were slightly lower than those from simulation, but were more favorable agreement with CHT model compared with SHC model by ANSYS software. Although error of SHC model was greater than the CHT model, the accuracy of SHC model was enough for neck calculation of cryogenic insulated cylinders and the method was convenient.