关于楔体砰击压力
On wedge-slamming pressures
摘要：
楔形体入水已成为船舶和海军工程研究中的模型试验。Wagner理论起源于1932年，它预测了冲击压力，并解释了楔体上润湿区附近各种流域对总压的贡献。在这里，我们研究了砰的一声的楔形和圆锥体在一个恒定的，良好的控制速度在整个影响事件使用高保真传感器。在撞击期间和之后测量撞击器上两个位置处的压力。从两个冲击器的压力时间序列讨论使用惯性压力和时间尺度。将无量纲压力时间序列与传感器集成平均复合Wagner解（Zhao & Faltinsen 1993）、Logvinovich（1969，4.7）、修改后的Logvinovich（Korobkin & Malenica 2005）和广义Wagner模型（Korobkin 2004）进行比较。此外，我们提供了一个独立的实验理由的近似在文献中的瓦格纳模型扩展到三维。本文的第二部分涉及预冲击空气缓冲-一个重要的问题，因为它是负责确定的空气层的厚度被困在影响。使用定制的技术，我们测量的空气-水界面的动态，因为它响应建立在空气层之间的冲击器和自由表面干预的压力。我们表明，实验和使用双流体边界积分（BI）模拟，预碰撞偏转的接口，由于空气缓冲充分描述的势流。
英文摘要：
The water entry of a wedge has become a model test in marine and naval engineering research. Wagner theory, originating in 1932, predicts impact pressures, and accounts for contributions to the total pressure arising from various flow domains in the vicinity of the wetting region on the wedge. Here we study the slamming of a wedge and a cone at a constant, well-controlled velocity throughout the impact event using high fidelity sensors. Pressures at two locations on the impactor are measured during and after impact. Pressure time series from the two impactors are discussed using inertial pressure and time scales. The non-dimensionalised pressure time series are compared to sensor-integrated averaged composite Wagner solutions (Zhao & Faltinsen 1993), Logvinovich (1969, 4.7), modified Logvinovich (Korobkin & Malenica 2005) and generalised Wagner models (Korobkin 2004). In addition, we provide an independent experimental justification of approximations made in the literature in extending the Wagner model to three-dimensions. The second part of the paper deals with pre-impact air cushioning -- an important concern since it is responsible for determining the thickness of air layer trapped upon impact. Using a custom-made technique we measure the air-water interface dynamics as it responds to the build up of pressure in the air layer intervening in between the impactor and the free surface. We show both experimentally and using two-fluid boundary integral (BI) simulations, that the pre-impact deflection of the interface due to air-cushioning is fully described by potential flow.
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