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Blast Wave Shaping by Altering Cross-Sectional Shape
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2021-03-08 , DOI: 10.1002/prep.202000283 Kelly Williams 1 , Martin J. Langenderfer 1 , Gayla Olbricht 2 , Catherine E. Johnson 1
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2021-03-08 , DOI: 10.1002/prep.202000283 Kelly Williams 1 , Martin J. Langenderfer 1 , Gayla Olbricht 2 , Catherine E. Johnson 1
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Standoff distances for people and equipment are determined using a scaled distance calculation that assumes a uniform distribution of explosive energy, which only occurs with center-initiated spherical charges in free air without ground effects. There is a significant amount of data available for spheres and cylinders in air and hemispheres on the ground, but little has been published for other geometries. Published studies of spherical, cylindrical, and planar charges demonstrate that there is a focus on the blast wave resulting from charge geometry. From these studies, it appears that the highest overpressure occurs in the orientation of the largest presented surface area. This paper presents experimental pressure data recorded from the detonation of spherical, cylindrical, and cubic charges at two scaled distances. The non-spherical charges were instrumented normal to two adjacent sides and the interjacent edge. The pressure normal to the sides of the cubic and cylindrical charges was up to 1.5 times that of the spherical charge in the near field, but lower in the far-field indicating that a simple multiplication factor will not accurately predict the overpressure over distance for complex charges from spherical data. The sides of the cubic charge produced a near field overpressure relative to its surface area consistent with those observed from the side and end of the cylindrical charge. In the far-field, the pressure from the sides of the charge was less than that of the sphere indicating that there is a lateral movement of energy behind the shock front causing a reversal of peak pressure in the measured orientations.
中文翻译：
通过改变横截面形状来整形冲击波
人员和设备的隔离距离是使用缩放距离计算确定的，该计算假设爆炸能量的均匀分布，只有在没有地面效应的自由空气中中心引发的球形炸药才会发生这种情况。有大量关于空气中的球体和圆柱体和地面半球体的数据可用，但很少有其他几何体的数据发表。已发表的关于球形、圆柱形和平面装药的研究表明，人们关注的是由装药几何形状产生的冲击波。从这些研究中，似乎最高超压出现在最大呈现表面积的方向。本文介绍了在两个缩放距离处从球形、圆柱形和立方体炸药爆炸记录的实验压力数据。非球形装药垂直于两个相邻边和中间边缘安装。立方体和圆柱体电荷侧面的法向压力在近场中高达球形电荷的 1.5 倍，但在远场中较低，这表明简单的乘法因子不能准确预测复杂的距离上的超压。来自球形数据的电荷。立方电荷的侧面产生了相对于其表面积的近场超压，这与从圆柱形电荷的侧面和末端观察到的一致。在远场中，来自电荷侧面的压力小于球体的压力，表明在激波前沿后面存在能量的横向移动，导致测量方向的峰值压力逆转。
更新日期：2021-03-08
中文翻译：
通过改变横截面形状来整形冲击波
人员和设备的隔离距离是使用缩放距离计算确定的，该计算假设爆炸能量的均匀分布，只有在没有地面效应的自由空气中中心引发的球形炸药才会发生这种情况。有大量关于空气中的球体和圆柱体和地面半球体的数据可用，但很少有其他几何体的数据发表。已发表的关于球形、圆柱形和平面装药的研究表明，人们关注的是由装药几何形状产生的冲击波。从这些研究中，似乎最高超压出现在最大呈现表面积的方向。本文介绍了在两个缩放距离处从球形、圆柱形和立方体炸药爆炸记录的实验压力数据。非球形装药垂直于两个相邻边和中间边缘安装。立方体和圆柱体电荷侧面的法向压力在近场中高达球形电荷的 1.5 倍，但在远场中较低，这表明简单的乘法因子不能准确预测复杂的距离上的超压。来自球形数据的电荷。立方电荷的侧面产生了相对于其表面积的近场超压，这与从圆柱形电荷的侧面和末端观察到的一致。在远场中，来自电荷侧面的压力小于球体的压力，表明在激波前沿后面存在能量的横向移动，导致测量方向的峰值压力逆转。
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