The quasi-steady regime in critically initiated detonation waves
The quasi-steady regime in critically initiated detonation waves
复制标题
临界引发的爆炸波中的准稳态
DOI：
10.1088/0022-3727/11/15/008
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发表时间：
1978
期刊：
影响因子：
--
通讯作者：
G. Thomas
中科院分区：
文献类型：
--
作者：
D. Edwards;G. Hooper;J. M. Morgan;G. Thomas
本文介绍了用爆炸丝和叠氮化铅小球作为爆源，在氧乙炔中用不同稀释剂引发球形爆轰波的实验工作。本文用三种方法研究了球形爆炸波在源能量大于或等于临界值时向爆轰波的转变。波结构的变化是从径向流动的烟箔上获得的蜂窝图案推断出来的：波前速度来自多普勒频率，并测量先导压力变化。对于超临界源能量的结果提供了一个详细的压力历史的过渡过程。在临界源能量，它示出的横波结构，这是存在于最初的过驱动波，消失时，建立低速制度。准稳定状态的持续时间约为10 μ s（或距离约为1厘米）之前，建立一个正常的CJ波。
Experimental work is described on the initiation of spherical detonation waves, in oxyacetylene with various diluents, using an exploding wire and a lead azide pellet as sources. The transition of the spherical blast wave to a detonation, when the source energy is either above or at the critical value, is studied by three methods. Changes in wave structure are inferred from the cellular patterns obtained on smoked foils orientated radially to the flow: the wavefront velocity is derived from the Doppler frequencies and the pilot pressure variation is measured. For supercritical source energies the results obtained provide a detailed pressure history of the transition process. At critical source energy it is shown that the transverse wave structure, which is present in the initially overdriven wave, disappears when the low-velocity regime is established. The duration of the quasi-steady regime is approximately 10 mu s (or distance approximately 1 cm) before the establishment of a normal CJ wave.