Optical flow tracking velocimetry of near-field explosions
Optical flow tracking velocimetry of near-field explosions
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DOI：
10.1088/1361-6501/ac4599
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发表时间：
2021-12
影响因子：
2.4
通讯作者：
J. Higham;O. Isaac;S. Rigby
中科院分区：
文献类型：
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作者：
J. Higham;O. Isaac;S. Rigby
为了更好地理解与爆炸后爆炸产物火球快速膨胀相关的复杂动力学和物理学，必须对其相关速度场进行完整描述。典型的实验技术依赖于从压力传感器或霍普金森压力棒捕获的简单单点测量。在本技术设计说明中，我们的目标是通过引入一种使用光流跟踪测速法从高速视频中确定全速度场的方法来改进当前的最先进技术。我们通过比较高速视频得出的速度场和同一情况下经过验证的数值模型，从我们的结果中证明了该方法的重要性。这项技术的更广泛使用将使研究人员能够阐明爆炸爆炸的空间和时间特征，而迄今为止使用单点测量还无法获得这些特征。
To better understand the complex dynamics and physics associated with the rapid expansion of the detonation product fireball following an explosion, it is imperative to have a full description of its associated velocity field. Typical experimental techniques rely on simple single-point measurements captured from pressure transducers or Hopkinson pressure bars. In this technical design note, we aim to improve the current state-of-the-art by introducing a means to determine full velocity fields from high-speed video using optical flow tracking velocimetry. We demonstrate the significance of this method from our results by comparing velocity fields derived from high-speed video and a validated numerical model of the same case. A wider use of this technique will allow researchers to elucidate spatial and temporal features of explosive detonations, which could not be obtained thus far using single-point measurements.