平板撞击水面时的空气卷入及其对压力脉动的影响
Air Entrapment and its effect on Pressure Impulses in the slamming of a Flat Disc on Water
摘要：
在液体撞击事件中，环境空气的存在在影响撞击前液体表面的形状和撞击时产生的载荷分布方面起着至关重要的作用。我们研究了在一个简化的几何形状的冲击载荷的滞留空气的效果，通过砰地一个水平的平板上的固定水浴在一个良好的控制速度。我们展示了空气捕获如何影响压力峰值在不同的径向位置上的光盘，如何影响的压力脉冲，以及如何本地的压力脉冲不同，从面积积分（力）脉冲的影响。更具体地说，我们发现，空气层的原因逐渐积累的负载达到峰值之前，并表明，这种积累遵循惯性缩放。此外，相同的局部压力脉冲在光盘中心被发现低于相应的（面积积分）力脉冲在整个光盘。虽然（面积积分）力脉冲接近于Batchelor（1967年，第6.10节）和Escherheen & McMahon（1996年）的经典结果，但发现盘中心（被困空气层最厚的地方）的局部压力脉冲更接近Peters等人（2013年）对空气冲击的理论估计。
英文摘要：
The presence of ambient air in liquid-slamming events plays a crucial role in influencing the shape of the liquid surface prior to the impact, and the distribution of loads created upon impact. We study the effect of trapped air on impact loads in a simplified geometry, by slamming a horizontal flat disc onto a stationary water bath at a well-controlled velocity. We show how air trapping influences pressure peaks at different radial locations on the disc, how the pressure impulses are affected, and how local pressure impulses differ from those obtained from area-integrated (force) impulses at impact. More specifically, we find that the air layer causes a gradual buildup of the load before the peak value is reached, and show that this buildup follows inertial scaling. Further, the same localised pressure impulse at the disc centre are found to be lower than the corresponding (area-integrated) force impulse on the entire disc. While the (area-integrated) force impulses are close to the classical result of Batchelor (1967, section 6.10) and Glasheen & McMahon (1996), the localised pressure impulses at disc center, where the trapped air layer is at its thickest, are found to lie closer to the theoretical estimation by Peters et al. (2013) for an air-cushioned impact.
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