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Coupling of the detonation and the precursor shock wave in the channel effect.

机译：爆轰与前驱激波在通道效应中的耦合。

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When a detonation propagates in an explosive that partially fills a channel, a shock wave can be generated in the air gap between the explosive and its confinement. This is typically referred to as the channel effect. In the air gap, the detonation products behave as a piston, which drives the precursor air shock wave ahead of the detonation. Since the shock wave runs ahead of the detonation, it preconditions the explosive and the detonation propagates into shocked explosive. This can affect the detonation in various ways, depending on the nature of the explosive. Properties such as heterogeneity, porosity and sensitivity of the explosive will determine how the precursor shock will affect the detonation propagation. Four different coupling mechanisms have been identified and are discussed in this thesis. They have been called: precompression, detonation initiation, surface ignition and dead pressing.; In the present study, three cases are investigated experimentally: precompression, detonation initiation and the case where no coupling occurs. The goal is to elucidate the respective propagation mechanisms. It is found that boundary layers on the channel walls significantly affect the precursor shock wave propagation. This effect is modeled and the results are compared to experiments.; When the explosive is PETN powder, the detonation is found to accelerate to 1.5 times the Chapman-Jouguet velocity. Experiments performed indicate that this is due to precompression of the PETN. Again this effect is modeled and compared with experiments.; It is also demonstrated that in the present experiments, coupling via initiation does not occur. However, experiments were performed to determine why the explosive is not initiated by the precursor shock wave. It is found that the initiation delay for the strength of precursor shock generated is simply too long for any coupling to occur.
机译：当爆炸在部分填充通道的炸药中传播时，在炸药及其限制区之间的气隙中会产生冲击波。这通常称为通道效应。在气隙中，爆炸产物充当活塞，在爆炸之前驱动前体空气冲击波。由于冲击波是在爆炸之前传播的，因此它是爆炸物的先决条件，并且爆炸传播为冲击炸药。根据炸药的性质，这可能以各种方式影响爆炸。炸药的异质性，孔隙率和敏感性等特性将决定前驱震荡将如何影响爆轰传播。本文确定并讨论了四种不同的耦合机制。它们被称为：预压缩，起爆，表面着火和静压。在本研究中，通过实验研究了三种情况：预压缩，爆轰引发和不发生耦合的情况。目的是阐明各自的传播机制。发现通道壁上的边界层显着影响前体冲击波的传播。对这种效果进行建模，并将结果与​​实验进行比较。当炸药是PETN粉末时，发现爆炸会加速至Chapman-Jouguet速度的1.5倍。进行的实验表明，这是由于PETN的预压缩所致。再次模拟了这种效果，并与实验进行了比较。还证明在本实验中，不会发生通过引发的偶联。然而，进行了实验以确定为什么爆炸物不是由前体冲击波引发的。已经发现，所产生的前体冲击的强度的启动延迟对于任何耦合的发生来说太长了。

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