液体晃荡自由液面波高的相似关系的实验研究

Experimental investigation on the similarity relationship of the free-surface wave elevation due to the liquid sloshing

采用模型实验进行液体晃荡问题研究时,相似关系是模型实验设计及结果分析中的一个关键问题,目前尚没有系统的针对不同比尺下液舱晃荡波高的相似关系研究。本文采用三个不同比尺的二维GTT八边形液舱,对比分析了不同比尺的模型液舱在单次激励下液体晃荡冲击的完整过程。结合波高幅值和高速视频研究波高,结果表明液舱晃荡波高均具有双峰形式,三个比尺的液舱整体流场形式相似,但晃荡冲击的物理现象存在差异。在相同实验介质下,大比尺液舱中晃荡冲击现象复杂,而小比尺液舱中晃荡冲击平缓,分析认为粘性是造成该差异的重要原因。此外,晃荡波高的相似关系与比尺有关。

The similarity relationship in designing sloshing model experiment and the result analysis is a key issue in the liquid sloshing problem.Nowadays,there are no systematic studies on the similarity relationship of free-surface wave elevation in the different scale model tanks.Three two-dimensional GTT tanks with different scales were designed to comparatively analyze the global sloshing impact process during single impact tests.Wave amplitudes and sloshing process were recorded to analyze the free-surface wave elevation.The results show that the global flows are similar in the three scale tanks.Furthermore,the wave elevation has bimodal characteristics in all the tanks,but the physical phenomenon during impact process exhibits different characteristics.Due to the viscosity effects,the slamming phenomenon is complex in the large-scale tank,while the slamming appears less violent in the small-scale tanks with the same experimental media.Furthermore,the similarity relationship of free-surface wave elevation is related to the model scales.