Numerical investigation of the effect of reactive gas jets on the flame acceleration and DDT process
Numerical investigation of the effect of reactive gas jets on the flame acceleration and DDT process
复制标题
反应气体射流对火焰加速和DDT过程影响的数值研究
DOI：
10.1016/j.ijhydene.2022.12.280
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发表时间：
2023-01
影响因子：
7.2
通讯作者：
Zhu Yuejin
中科院分区：
文献类型：
--
作者：
Wang Jiabao;Zhao Xinyu;Pan Jianfeng;Zhu Yuejin
喷流障碍物可以快速诱导燃烧转爆轰（DDT）过程，降低发动机推力损失。然而，利用可燃预混气体作为反应射流障碍物的研究却很少。基于OpenFOAM平台，对不同初始射流速度和射流障碍物数目下的火焰加速和DDT过程进行了详细的数值研究。结果表明，尽管反应射流障碍物产生的较强火焰会在更大程度上降低虚拟阻塞比，但其产生的湍流和燃烧放热效应仍显著促进火焰加速。在火焰加速方面，在初始阶段，提高射流初速度对火焰加速没有明显的影响。随后，湍流和燃烧放热开始主导火焰加速，并显著促进火焰加速。由于本研究中的射流采用相同的可燃预混气体，增加下游反应射流障碍物的数量不会改善上游火焰加速。在爆震转爆轰过程中，提高反应射流的初始速度有利于爆震的发生，但障碍物数目对爆震转爆轰的影响受射流初始速度的影响较大。当射流初始速度较低时，射流障碍物的增多对爆震起着显著的促进作用，而当射流初始速度较高时，射流引起的湍流增强是火焰加速的主要因素。因此，与射流障碍物的数量相比，预混气体的爆轰起爆过程对初始射流速度的变化更为敏感。
Jet obstacles can quickly induce the deflagration to detonation transition (DDT) process and reduce the thrust loss of an engine. However, there are few studies on the use of combustible premixed gases as the reactive jet obstacle. Based on the OpenFOAM platform, a detailed numerical investigation of the flame acceleration and DDT process is carried out with different initial jet velocities and the number of jet obstacles. The results show that, although the stronger flame generated by the reactive jet obstacles will reduce the virtual blockage ratio to a greater extent, the turbulence and combustion heat release effect generated by them still significantly promote the flame acceleration. In terms of flame acceleration, initially, increasing the initial jet velocity has no obvious effect on the flame acceleration. Later, turbulence and combustion heat release begin to dominate the flame acceleration and significantly promote the flame acceleration. Since the jets in this study adopt the same combustible premixed gases, increasing the number of reactive jet obstacles downstream does not improve the upstream flame acceleration. In DDT, increasing the initial velocity of the reactive jet can improve the detonation initiation, but the effect of the obstacle number on DDT is greatly affected by the initial jet velocity. Specifically, at a low initial jet velocity, more jet obstacles can significantly promote the detonation initiation, while at a high initial jet velocity, the enhanced turbulence caused by the jet is the dominant factor for the flame acceleration. Therefore, compared with the number of jet obstacles, the detonation initiation process of the premixed gases is more sensitive to the change in the initial jet velocity.
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