爆轰波与惰性气块相互作用的一维数值研究  

One-dimensional numerical study of the interaction between a detonation wave and an inert gas plug

作　　者：赵珉 陈煌威 司晨威 朱跃进[1] Zhao Min;Chen Huangwei;Si Chenwei;Zhu Yuejin(School of Energy and Power Engineering,Jiangsu University,Zhenjiang 212013,China)

机构地区：[1]江苏大学能源与动力工程学院,镇江212013

出　　处：《空天技术》2023年第3期60-70,共11页Aerospace Technology

基　　金：国家自然科学基金(12272152)。

摘　　要：爆轰波与惰性气块的相互作用会引发复杂的波系和界面变化,加速惰性组分与周围可燃预混气的混合,并影响爆轰波透射后能否二次起爆。基于OpenFOAM开源计算平台,对爆轰波与有限长度惰性气块的相互作用进行了一维数值研究,考察了不同密度及长度对两者相互作用过程的影响。结果发现,爆轰波在透射不同参数惰性气块后,流场中均出现了二次起爆、爆燃和熄爆三种状态,并且长度越长、Atwood数越大的惰性气块越容易抑制爆轰波的传播。由于研究所采用的惰性气块长度较短,因此,相比于气块长度,惰性气块内外的密度差异对能否二次起爆有更重要的影响。进一步还可以发现,惰性气块被爆轰波冲击时会发生明显的压缩和运动,且压缩程度随着发生二次起爆、爆燃和熄爆等不同情形而逐渐变弱。此外,二次起爆产生的高压能够明显阻碍惰性气块持续向下游的运动。需要注意的是,对于密度越大的惰性气块,尽管其初始长度不同,但爆燃和熄爆状态对应的压缩率差异越来越小。相关结论可以为揭示爆轰波与惰性气块之间的相互作用提供详细的理论支持,对工业安全中的阻爆抑爆研究具有重要意义。The interaction between the detonation wave and the inert gas plug can lead to the complex changes of wave system and interface, which can accelerate the mixing between the inert component and the surrounding combustible premixed gases, and affect whether the detonation wave can be re-initiated after transmission. Based on the open-source computational platform OpenFOAM, a one-dimensional numerical investigation is carried out on the interaction between the detonation wave and the finite-length inert gas plug,examining the effects of different densities and lengths on the interaction process. The results show that after the detonation wave transmits inert gas plugs with different parameters, there are three states of secondary detonation, deflagration and extinction in the flow field, and the longer the length and the larger the Atwood number, the easier it is to suppress the propagation of detonation wave. Due to the short length of the inert gas plug used in this study, the density difference between the inside and outside of the inert gas plug has a more important influence on whether the secondary detonation can be initiated. In addition, it can be found that the inert gas plug will undergo obvious compression and movement when it is impacted by the detonation wave,and the degree of compression gradually weakens with the occurrence of secondary detonation, deflagration and extinction. In addition, the high pressure generated by the secondary detonation can significantly hinder the continuous downstream movement of the inert gas plug. It should be noted that for inert gas plugs with higher density, although their initial lengths are different, the difference in compression rates corresponding to deflagration and extinction states will become smaller and smaller. The relevant conclusions can provide detailed theoretical support for revealing the interaction between the detonation wave and the inert gas plug,which is of great significance to the study of explosion suppression in industrial safety.

关 键 词：爆轰波 惰性气块 密度变化 透射 阻爆抑爆 

分 类 号：O381[理学—流体力学]