储罐中心区填充多孔材料对LNG流动特征影响的数值模拟

Numerical Simulation of the Influence of Filling Porous Material in the Central Area of Storage Tank on LNG Flow Characteristics

通过Fluent 6.3建立了多孔介质中湍流流动的二维模型,选取储罐中心区填充多孔材料并采用不同的填充厚度,对储罐内液化天然气(LNG)的流动特征进行了数值模拟,并与无多孔材料填充的情况进行了对比。结果表明:在储罐中心区内填充多孔材料可使罐体两边的流动强度较强,中间的流动强度较弱,中间滚动圈的滞留区面积比两侧滚动圈大,同时可降低流体平均流速,减少液体蒸发量,减少下层液体积聚的能量,可在一定程度上抑制翻滚事故的发生。

This paper builds a two-dimensional model of turbulent flow in porous media by Fluent 6.3,and fills the central area of storage tank with porous material and uses different thickness.The paper simulates the flow of liquefied natural gas(LNG)in the storage tank,and compares with that of non-porous material flow conditions.The results show that the filling of the porous material in the central area of the tank can make the flow intensity on both sides of the tank stronger than that in the middle,make the stagnant area of the intermediate rolling circle larger than that of the two sides,and reduce the average fluid velocity the amount of liquid evaporation,andthe accumulation of lower liquid,so to a certain extent,inhibit the occurrence of rollover.