简谐激励下大型低温贮箱防晃设计

Design of slosh baffle in large cryogenic tank under harmonic excitation

针对某大型低温贮箱,基于水平环形防晃板和竖直防晃板设计了一种布置于整个贮箱的固定结构防晃板,采用CFD软件Flow-3D数值模拟了一定简谐激励下,不同充注率时该防晃板的防晃效果.通过与液面水平环形防晃板对比发现:两种结构防晃效果相近,均可以显著抑制不同充注率下液体的质量中心波动范围.当充注率为50%时,两防晃结构甚至可以使波动范围减小64%;在晃动过程中,相比于液面水平环形防晃板,固定结构防晃板中单层水平环形防晃板的受力更小,但是贮箱受到的压力会有所增加;对比相同面积液面水平环形防晃板和竖直防晃板的防晃效果,液面水平环形防晃板优势更加明显;随着充注率的增大,液体在贮箱内晃动时液体的质量中心波动范围逐渐减小.

A fixed construction slosh baffle arranged in the whole tank was designed for a large cryogenic tank based on the horizontal ring slosh baffle and vertical slosh baffle.The effects of this slosh baffle at different fill levels were simulated numerically,using CFD software Flow-3Dunder a harmonic excitation.Comparisons with a horizontal ring slosh baffle at the liquid surface show that the effects of these two baffles are similar,both of them can significantly reduce the wave range of the center of liquid mass at different fill levels.The wave range can even be decreased by 64% at 50%fill level.During the slosh,the pressure imposed on the single board of the fixed construction slosh baffle is smaller than that of horizontal ring slosh baffle at the liquid surface,while the tank wall of the former undergoes higher pressure.The effect of horizontal ring slosh baffle at the liquid surface is more obvious than the vertical slosh baffle when they have the same board areas.The wave range of the center of liquid mass in the tank decreases as the fill level increases.