LNG燃料舱晃荡载荷数值分析

以某冷藏集装箱船的薄膜型液化天然气(LNG)燃料舱为例,考虑船舶运动与燃料舱内LNG晃荡的耦合作用,根据势流理论在时域内求解燃料舱内LNG的晃荡压力,将作用在舱壁的晃荡载荷分解为脉冲压力和非脉冲压力。将随时间变化的LNG脉冲压力作为虚拟的附加质量耦合船舶的运动,采用数值模拟的方法分析LNG燃料舱的晃荡压力。结果表明,当燃料舱距离船中较远、重心较高时晃荡压力大幅增加。研究成果对其他类型的LNG燃料舱晃荡压力的计算具有一定的参考意义。

Numerical Analysis of Sloshing Load in LNG Bunker

Taken a membrane-type LNG bunker of a refrigerated container ship for example, and considered the coupling effect of ship motion and sloshing in LNG bunker, the LNG sloshing pressure in the bunker is calculated in the time domain based on the potential flow theory. The oscillating load acting on the bulkhead is decomposed into the impulse pressure and non-impulse pressure. The time-varying LNG pulse pressure is regarded as the virtual additional mass to couple the ship motion, and the sloshing pressure of LNG bunker is analyzed by the numerical simulation method. The results show that the sloshing pressure increases greatly when the bunker is farther from the midship with a higher center of gravity. The research results can possess certain reference significance for the sloshing pressure calculation of other types of LNG bunkers.