Abst'/> Experimental study of the bubble sweep-down phenomenon on three bow designs
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Experimental study of the bubble sweep-down phenomenon on three bow designs

机译：三种弓形设计中气泡吹落现象的实验研究

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AbstractThe bubble sweep-down phenomenon around the oceanographic research vessels generates acoustic perturbations. A specific experimental protocol has been developed in a wave and circulating tank to study this phenomenon. This protocol is used to carry out trials on three different ship models in order to study the influence of the bow geometry on the bubble generation. For different test configurations, bubble clouds are described and compared in terms of area, maximal depth and vertical velocity to highlight bubble cloud dynamics surrounding the three ship models. The relation between the hydrodynamic flow field and the bubble generation is studied by means of Particle Image Velocimetry (PIV) measurements to study the phenomenon by the use of phase averaged velocity fields. The overall results enable us to characterize the bubble sweep-down phenomenon from the air bubble generation and propagation to the frequency of occurrence and the clouds behaviour.Highlights•Air entrainment is studied on three kind of ship bow geometry.•Bow geometry effects on depth, area and velocity bubble cloud characteristics are determined.•PIV measurements and POD analysis allow to study the air bubble generation.
机译： 摘要 海洋研究船周围的气泡倾泻现象会产生声学扰动。已经在波浪和循环罐中开发了一种特定的实验方案来研究这种现象。该协议用于对三种不同的船舶模型进行试验，以研究船首几何形状对气泡产生的影响。对于不同的测试配置，将描述气泡云并根据面积，最大深度和垂直速度进行比较，以突出显示围绕这三种船模型的气泡云动力学。借助粒子图像测速（PIV）测量研究了流体动力流场与气泡生成之间的关系，以利用相平均速度场研究现象。总体结果使我们能够表征从气泡的产生和传播到出现的频率和云的行为的气泡向下吹扫现象。 突出显示 • 研究了三种船bow几何形状的空气夹带。 • 弓形几何对深度，面积和速度气泡的影响确定了云特征。 • 通过PIV测量和POD分析可以研究气泡的产生。 < / ce：abstract-sec>

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