Solid obstacles induce the detonation in premixed gases while causing significant thrust losses. Jet obstacles can alleviate this deficiency, but there have been few studies on multi-group reactive jet obstacles. In this study, a detailed numerical simulation is performed to investigate the selection of the quantity of reactive jet obstacles and examine the effect of the arrangement of different jet obstacles on flame acceleration and the deflagration to detonation transition (DDT) processes. The results show that there is an optimal quantity of jet obstacles that can rapidly trigger detonation while reducing thrust loss and combustion chamber weight. In terms of flame acceleration, the mechanisms of flame acceleration by reactive jet obstacles with various arrangement types are complex. Specifically, the initial flame acceleration effect of reactive jet obstacles with different arrangement types is similar. However, the staggered arrangement has a longer-lasting vortex structure, stronger leading compression wave and flow field intensity, which provides favorable conditions for the ensuing flame acceleration. When the flame interacts with the jet, the larger virtual blockage ratio and stronger combustion heat release effect further amplify the flame acceleration discrepancy. In DDT, compared with solid obstacles, reactive jet obstacles have more advantages. Different types of jet obstacles arrangement differ in their ability and method in triggering DDT, with the staggered arrangement having the best DDT effect, and detonation initiation modes are divided into two categories: i) the detonation induced by the coupling of the flame surface and the high-pressure region; ii) the reflected wave impinges on the flame surface after the compression waves in front of the flame collide with the wall, resulting in a detonation. Although the quantity and arrangement of jet obstacles vary in this study, all the cases where detonation occurs are consistent with the flame acceleration model of Liberman and similar SWACER mechanism.

固体障碍物在预混气体中引起爆炸，同时造成显着的推力损失。射流障碍可以弥补这一不足，但目前对多组反应性射流障碍的研究还很少。在这项研究中，进行了详细的数值模拟，以研究反应射流障碍物数量的选择，并检查不同射流障碍物的布置对火焰加速和爆燃到爆轰转变 (DDT) 过程的影响。结果表明，在减少推力损失和燃烧室重量的同时，存在一个最佳数量的射流障碍物可以快速触发爆炸。在火焰加速方面，各种布置形式的反应射流障碍物对火焰加速的机理较为复杂。具体来说，不同布置方式的反应射流障碍物的初始火焰加速效果相似。但交错排列的涡流结构持续时间更长，前导压缩波和流场强度更强，为随后的火焰加速提供了有利条件。当火焰与射流相互作用时，更大的虚阻塞比和更强的燃烧放热效应进一步放大了火焰加速的差异。在DDT中，与固体障碍物相比，反应射流障碍物更具优势。不同类型的射流障碍物排列方式触发DDT的能力和方式不同，交错排列的DDT效果最好，起爆方式分为两类：i) 火焰表面与高压区耦合引起的爆轰；ii) 火焰前方的压缩波与壁碰撞后，反射波撞击火焰表面，导致爆炸。尽管本研究中射流障碍物的数量和排列方式有所不同，但所有发生爆轰的情况都符合Liberman火焰加速模型和类似的SWACER机制。