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Effect of ignition parameters on detonation initiation using toroidal shock wave focusing

机译：点火参数对使用环形冲击波聚焦的爆轰起始的影响

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摘要

For fast detonation initiation, a novel compact initiator based on shock wave focusing has been proposed in our work. Two-dimensional numerical investigation was performed to understand the fast detonation initiation mechanism in hydrogen-air mixtures. Detailed evolution processes, namely, flame acceleration, shock wave focusing and detonation initiation were analyzed. Moreover, effects of ignition energy and energy release time on detonation initiation have been discussed thoroughly. The numerical results indicate that flame acceleration process can be divided into three stages: a) curling deformation of flame with low speed, b) tensile deformation of flame with medium speed, c) steady propagation of flame with high speed. After shock focusing, a highly compressed and heated region triggers the rapid detonation initiation. Further analysis indicated that detonation initiation time increases with the decrease of ignition energy. And the reason is mainly due to initial ignition delay differences controlled by ignition energy. In particular, once ignition energy is smaller than 12.5 mJ, mixtures will be no longer ignited. Besides, with the increase of energy release time, both the run-up time and distance of detonation initiation increase. The rapid release of energy can not only make mixtures ignited earlier, but also enhance initial flame velocity. As a result, when energy release time is reduced from 200 mu s to 50 mu s, the run-up time and distance are decreased by 50% and 32.5%. (C) 2020 Elsevier Masson SAS. All rights reserved.
机译：对于快速爆轰起始，在我们的工作中提出了一种基于冲击波聚焦的新型紧凑型引发剂。进行二维数值研究以了解氢气混合物中快速爆轰起始机理。分析了详细的演化过程，即，分析了火焰加速度，冲击波聚焦和爆轰起始。此外，已经彻底讨论了点火能量和能量释放时​​间对爆轰开始的影响。数值结果表明，火焰加速过程可以分为三个阶段：a）卷曲变形的火焰，b）张力变形的火焰，c）稳定地传播火焰高速传播火焰。在休克聚焦后，高压缩和加热的区域触发快速爆轰起始。进一步的分析表明，随着点火能量的降低，爆轰起始时间增加。并且原因主要是由于点火能量控制的初始点火延迟差异。特别是，一旦点火能量小于12.5 MJ，混合物将不再被点燃。此外，随着能量释放时​​间的增加，爆轰起始的延伸时间和距离都增加。能量的快速释放不仅可以使混合物更早地点燃，而且增强了初始火焰速度。结果，当能量释放时​​间从200μm达到50μm减少时，加速时间和距离减小了50％和32.5％。 （c）2020 Elsevier Masson SAS。版权所有。

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