Experiments on oblique water entry of high-speed projectiles are performed to investigate cavity evolution and impact loads. The nose shape determines the cavity behavior and consequently affects the load characteristics. Each projectile used in the experiments has a truncated-cone head and a cylindrical body. The geometry of the truncated cone is defined by two dimensionless parameters. We adopt 40 kinds of head shape, while the impact velocity (41 m/s) and impact angle (30°) are kept the same. The cavity and load characteristics are investigated using a high-speed camera and an acceleration sensor, respectively. We divide the cavity dynamics into two types. In one type, the first cavity develops and coalesces with the second cavity, leading to the formation of a single continuous cavity. In the second type, the closure of the first leading cavity occurs on the truncated-cone head or the cavity may collapse onto the head in later stages, causing the two cavities develop independently without coalescence. We also find that the transient impact load and the cavity dynamics are closely related, which has not been discussed in detail in previous studies. The quantitative relationship between the load peaks and the two dimensionless parameters is revealed.

进行了高速弹丸斜入水的实验，以研究空洞的演变和冲击载荷。鼻形决定型腔的性能，并因此影响载荷特性。实验中使用的每个弹丸都有一个截头圆锥形的头部和一个圆柱体。截锥的几何形状由两个无量纲参数定义。我们采用40种头部形状，而撞击速度（41 m / s）和撞击角度（30°）保持不变。分别使用高速相机和加速度传感器研究型腔和载荷特性。我们将腔动力学分为两种类型。在一种类型中，第一腔发展并与第二腔融合，导致形成单个连续腔。在第二种类型中 第一个前腔的闭合发生在截头圆锥形的头部上，或者在以后的阶段中空腔可能塌陷到头部上，从而导致两个空腔独立发展而没有聚结。我们还发现瞬态冲击载荷与腔体动力学密切相关，在先前的研究中并未对此进行详细讨论。揭示了载荷峰值与两个无量纲参数之间的定量关系。