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The Effects of Containment on Detonation Velocity

机译：密闭性对爆速的影响

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Reactive flow cylinder code runs on six explosives were made with rate constants varying from 0.03 to 70 uss~(-1).Six unconfined/steel sets of original ANFO and dynamite data are presented.A means of comparing confinement effects both at constant radius and at constant detonation velocity is presented.Calculations show two qualitatively different modes of behavior.For U_s/C_o>1.2,where U_s is the detonation velocity and C_o the zero-pressure sound speed in steel,we find a sharp shock wave in the metal.The shock passes through the steel and the outer wall has a velocity jump-off.For U_s/C_o<=1.04, we find a pressure gradient that moves at the detonation velocity.A precursor pulse drives in the explosive ahead of the detonation front.The outer wall begins to move outward at the same time the shock arrives in the explosive,and the outer wall slowly and continuously increases in velocity.The U_S/C_o>=1.2 cylinders saturate in detonation velocity for thick walls but the U_s/C_o1.04 case does not.The unconfined cylinder shows an edge lag in the front that approximately equals the reaction zone length,but the highly confined detonation front is straight and contains no reaction zone information.The wall thickness divided by the reaction zone length yields a dimensionless wall thickness, which allows comparison of explosives with different detonation rates. Even so,a rate effect is found in the detonation velocities, which amounts to the inverse 0.15-0.5 power.
机译：制作了在6枚炸药上进行反应的流动圆柱体程序，其速率常数从0.03到70 uss〜（-1）不等，给出了6组无约束/钢原始ANFO和炸药数据集，以比较在恒定半径和最小半径下的约束作用计算表明两种定性不同的行为模式。对于U_s / C_o> 1.2，其中U_s是爆轰速度，C_o是钢中的零压力声速，我们在金属中发现了尖锐的冲击波。冲击通过钢，外壁有一个速度跃变，对于U_s / C_o <= 1.04，我们发现一个以爆炸速度移动的压力梯度。前驱脉冲在爆炸前沿推动爆炸物。在冲击波到达炸药的同时，外壁开始向外移动，外壁的速度缓慢而连续地增加。对于厚壁，U_S / C_o> = 1.2圆柱体的爆轰速度达到饱和，但U_s / C_o < <1.04例d不受约束的圆柱体在前端显示出一个边缘滞后，大约等于反应区长度，但高度受限的爆炸前沿是笔直的，不包含反应区信息。壁厚除以反应区长度可得到无量纲的壁厚，可以比较具有不同爆震速率的炸药。即便如此，在爆速中也发现了速率效应，这相当于0.15-0.5幂的倒数。

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