Abstract

In this paper, we experimentally determine the drag coefficient when conical and cylindrical impactors penetrate into sandy soil. In the experiments, the half-opening angle of the conical tip of the penetrator (indenter) varied from 10° to 90°. The velocity of indenter movement varied in the range of 0.2–2.0 km/s. The average values of the drag coefficient are obtained for conical bodies during quasi-stationary supersonic motion in sandy soil with an average moisture content of 7–12% and for indenters with a flat front end in sandy soil with a moisture content of 0–16%. A significant dependence of the drag coefficient of thin cones (β < 25°) on the movement velocity and the absence of such a dependence (taking into account the experimental error) for obtuse cones and an indenter with a flat end were shown.

中文翻译：

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砂土中超音速运动过程中圆锥形侵彻和前端平坦的侵彻阻力系数的实验确定

摘要

在本文中，我们通过实验确定了圆锥形和圆柱形冲击器渗入砂土时的阻力系数。在实验中，穿透器（压头）的圆锥形尖端的半开角在10°到90°之间变化。压头运动的速度在0.2-2.0 km / s的范围内变化。在平均水分含量为7–12％的沙土中，准静态超音速运动期间，圆锥形体的阻力系数为平均值；在水分含量为0–16的沙土中，具有平坦前端的压头得到的阻力系数的平均值％。示出了细锥的阻力系数（β<25°）与运动速度的显着相关性，并且对于钝角的锥和带有平端的压头没有这种相关性（考虑到实验误差）。