Granular cratering is a ubiquitous phenomenon occurring in various natural and industrial contexts. Although impact‐induced granular cratering has been extensively studied, fewer experiments have been conducted on granular cratering via low‐energy explosions. Here, we study the dynamics and scaling of explosion granular cratering by injecting short pulses of pressurized air in quasi‐two‐dimensional granular media. Through an analysis of the dynamics of explosion processes at different explosion pressures, explosion durations, and burial depths, we identify two regimes, the bubbling and the eruption regimes, in explosion granular cratering. Our experiments explore the distinctive dynamics and crater morphologies of these regimes and show the energy scaling of the size of explosion craters. We compare high‐energy and low‐energy explosion cratering as well as explosion and impact cratering in terms of their energy scalings. Our work illustrates complex granular flows in explosion cratering and provides new insights into the general scaling of granular cratering processes. © 2017 American Institute of Chemical Engineers AIChE J, 64: 2972–2981, 2018

中文翻译：

---

颗粒介质中爆炸坑的动力学和定标

颗粒状缩孔是在各种自然和工业环境中普遍存在的现象。尽管已经广泛研究了冲击诱发的颗粒坑，但通过低能爆炸对颗粒坑进行的实验却很少。在这里，我们通过在准二维颗粒介质中注入压缩空气的短脉冲来研究爆炸颗粒坑的动力学和定标。通过分析不同爆炸压力，爆炸持续时间和埋葬深度下爆炸过程的动力学，我们确定了爆炸颗粒坑中的两种状态，即起泡状态和喷发状态。我们的实验探索了这些区域的独特动力学和陨石坑形态，并显示了爆炸陨石坑大小的能量尺度。我们比较了高能和低能爆炸坑以及爆炸和冲击坑的能量规模。我们的工作说明了爆炸坑中的复杂颗粒流，并为颗粒坑过程的一般规模提供了新的见解。©2017美国化学工程师学会AIChE J，64：2972–2981，2018