Abstract
Abstract The precursor air shock wave (PAS), which propagates ahead of the detonation front in an air channel, precompresses and desensitizes the unreacted explosive charges. Under some conditions, the PAS causes detonation failure. This phenomenon is known as the channel effect. To investigate the mechanism of the channel effect in emulsion explosives, some experimental work has been carried out using a high-speed framing camera. The results of photographic observation demonstrated that the difference between PAS velocity and detonation velocity was the primary factor for the channel effect. It is assumed that a decrease in the PAS velocity can prevent the channel effect. The ability of increased surface roughness of the inner wall to decrease the PAS velocity was tested. Some experiments were conducted to investigate the effects of surface roughness on the PAS velocity and the detonation propagation. The experimental results indicate that increased surface roughness can reduce the PAS velocity and prevent detonation failure.
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