【摘要】 对于大型液舱晃荡问题,目前室内模型试验是能够真实复现晃荡规律最可靠的方法,但模型试验在Froude相似准则下换算得到的原型结果却不一定能与原型实测结果完全一致。因此,尺度效应对结果换算的影响一直为国际研究热点。论文采用缩尺比为1:1、1:2和1:3的系列二维GTT液舱,在长时间横荡规则激励作用下,针对20%载液率开展晃荡试验尺度效应研究。通过Froude相似准则将模型液舱冲击载荷试验结果换算到原型液舱,并对载荷峰值作超越概率统计以及三参数Weibull分布拟合;试验结果表明,将模型结果换算到原型时存在明显差异;通过对冲击过程中流场形态分析发现气液密度比是导致模型和原型结果之间存在较大差异的重要原因。而且,模型液舱比尺越大越能真实反应原型液舱晃荡冲击规律。该研究结果可为大型液舱工程设计提供有益的参考。更多还原

【Abstract】 A series of scaled 2D GTT tanks(1:1-scale, 1:2-scale and 1:3-scale) are adopted to study the scale effect in 20% filling condition under long-playing regular swaying motion. Measured impact loads on scaled model tank wall are scaled up to reflect prototype results through Froude similarity criteria. Peaks statistics are made with the exceedance probability diagram, which is fitted with Weibull’s distribution. The results show that there are some distinct deviations between different scaled models, mainly due to gas-liquid density ratio in the impact process. This research could offer a beneficial reference for large tank design.更多还原