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Experiments on the water entry of curved wedges: High speed imaging and particle image velocimetry

机译：弯曲楔入水实验：高速成像和粒子图像测速

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摘要

In this work, we experimentally study the water entry of curved rigid wedges. Experiments are performed on two groups of rigid wedges comprising five specimens each. Each group has a fixed mean deadrise angle (25° and 35°) and varying radius of curvature. Drop tests are conducted in free-fall, and the drop height is parametrically varied to investigate the effect of the entry velocity on the pile-up evolution, the impact dynamics, and the energy transferred to the fluid. Specifically, high speed imaging is utilized to simultaneously measure the penetration depth of the wedge and its wetted surface. Experimental results are used to compute the pile-up coefficient, which is found to be largely independent of both the wedge geometry and the entry velocity, while exhibiting modest variations as a function of the penetration depth. In addition, particle image velocimetry is used to investigate the flow physics generated by the water entry, and especially dissect the energy absorbed by the risen water during impact. Results show that between 60 and 80% of the impact energy is consistently transferred to the risen water, which accounts for the formation of the pile-up and the spray jets.
机译：在这项工作中，我们通过实验研究了弯曲的刚性楔块的入水情况。实验是在两组刚性楔块上进行的，每个楔块分别包含五个样本。每组具有固定的平均死角（25°和35°）和变化的曲率半径。跌落测试是在自由落体中进行的，跌落高度是根据参数变化的，以研究入口速度对堆积演化，冲击动力学和传递给流体的能量的影响。具体地，利用高速成像来同时测量楔形及其湿润表面的穿透深度。实验结果用于计算堆积系数，发现堆积系数在很大程度上不依赖于楔形几何形状和进入速度，同时表现出随穿透深度而变化的适度变化。另外，使用粒子图像测速技术研究了进水产生的流动物理现象，特别是剖析了上升水在撞击过程中吸收的能量。结果表明，有60％到80％的冲击能量始终转移到上升的水中，这说明了堆积物和喷射流的形成。

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  • 来源
    《Ocean Engineering》 |2015年第15期|213-222|共10页
  • 作者

    R. Panciroli; A. Shams; M. Porfiri;

  • 作者单位

    Department of Mechanical and Aerospace Engineering, New York University Polytechnic School of Engineering, 6 MetroTech Center, Brooklyn, NY 11201, USA,Universita degli Studi Niccolo Cusano, Via Don Carlo Gnocchi 3, 00166 Rome, Italy;

    Department of Mechanical and Aerospace Engineering, New York University Polytechnic School of Engineering, 6 MetroTech Center, Brooklyn, NY 11201, USA;

    Department of Mechanical and Aerospace Engineering, New York University Polytechnic School of Engineering, 6 MetroTech Center, Brooklyn, NY 11201, USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Curved wedges; Particle image velocimetry; Pile-up; Slamming; Water entry;

    机译：弯曲的楔子;粒子图像测速;积累;砰的一声进水口;

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