论文标题
空气夹带及其对水上盘式压力冲动压力冲动的影响
Air Entrapment and its effect on Pressure Impulses in the slamming of a Flat Disc on Water
论文作者
论文摘要
在液体延伸事件中存在环境空气在影响撞击之前影响液体表面的形状以及对撞击时产生的负载的分布中起着至关重要的作用。我们通过将水平平坦圆盘撞到控制良好的速度下的固定水浴上，研究被困空气对简化几何形状中冲击负荷的影响。我们展示了空气诱捕如何影响盘上不同径向位置的压力峰，压力冲动的影响以及局部压力冲动与撞击处的面积集成（力）冲动的局部压力脉冲如何不同。更具体地说，我们发现在达到峰值之前，空气层会导致负载的逐渐堆积，并表明此堆积遵循惯性缩放。此外，发现圆盘中心的相同局部压力脉冲低于整个盘上相应的（面积集成）力脉冲。尽管（区域集成的）力冲动与Batchelor（1967，第6.10节）和Glasheen＆McMahon（1996）的经典结果接近，但在圆盘中心的局部压力冲动，该局部压力冲动最厚，在该中心最厚，发现了Peters等人的理论估计。 （2013年）用于空气冲洗的影响。
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.
