Detonation initiation induced by dual hot spots: a computational study
文献类型：期刊论文
| 作者 | Sun J1; Yu DH(于德海)2; Yang PF(杨鹏飞)2 ; Wang YQ1; Wang SK1; Chen Z1
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| 刊名 | JOURNAL OF FLUID MECHANICS
 |
| 出版日期 | 2025-05-01 |
| 卷号 | 1010页码:A60 |
| 关键词 | detonation initiation dual hot spots shock wave collision detonation diffraction |
| ISSN号 | 0022-1120 |
| DOI | 10.1017/jfm.2025.351 |
| 英文摘要 | Two-dimensional simulations incorporating detailed chemistry are conducted for detonation initiation induced by dual hot spots in a hydrogen/oxygen/argon mixture. The objective is to examine the transient behaviour of detonation initiation as facilitated by dual hot spots, and to elucidate the underlying mechanisms. Effects of hot spot pressure and distance on the detonation initiation process are assessed; and five typical initiation modes are identified. It is found that increasing the hot spot pressure promotes detonation initiation, but the impact of the distance between dual hot spots on detonation initiation is non-monotonic. During the initiation process, the initial hot spot autoignites, and forms the cylindrical shock waves. Then, the triple-shock structure, which is caused by wave collisions and consists of the longitudinal detonation wave, transverse detonation wave and cylindrical shock wave, dominates the detonation initiation behaviour. A simplified theoretical model is proposed to predict the triple-point path, whose curvature quantitatively indicates the diffraction intensity of transient detonation waves. The longitudinal detonation wave significantly diffracts when the curvature of the triple-point path is large, resulting in the failed detonation initiation. Conversely, when the curvature is small, slight diffraction effects fail to prevent the transient detonation wave from developing. The propagation of the transverse detonation wave is affected not only by the diffraction effects but also by the mixture reactivity. When the curvature of the triple-point trajectory is large, a strong cylindrical shock wave is required to compress the mixture, enhancing its reactivity to ensure the transverse detonation wave can propagate without decoupling. |
| 分类号 | 一类/力学重要期刊 |
| 语种 | 英语 |
| WOS记录号 | WOS:001485390800001 |
| 其他责任者 | Chen Z |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/101439]  |
| 专题 | 力学研究所_高温气体动力学国家重点实验室 |
| 作者单位 | 1.沈阳工业大学工程学院; 2.中国科学院力学研究所 |
| 推荐引用方式 GB/T 7714 | Sun J,Yu DH,Yang PF,et al. Detonation initiation induced by dual hot spots: a computational study[J]. JOURNAL OF FLUID MECHANICS,2025,1010:A60. |
| APA | Sun J,于德海,杨鹏飞,Wang YQ,Wang SK,&Chen Z.(2025).Detonation initiation induced by dual hot spots: a computational study.JOURNAL OF FLUID MECHANICS,1010,A60. |
| MLA | Sun J,et al."Detonation initiation induced by dual hot spots: a computational study".JOURNAL OF FLUID MECHANICS 1010(2025):A60. |
入库方式： OAI收割
来源：力学研究所
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