The thermodynamics of C-J deflagration
文献类型：期刊论文
| 作者 | Liu YF(刘云峰)1,2
|
| 刊名 | CASE STUDIES IN THERMAL ENGINEERING
 |
| 出版日期 | 2024-12-01 |
| 卷号 | 64页码:22 |
| 关键词 | C-J detonation C-J deflagration Detonation instability Detonation quenching Constant-pressure combustion Deflagration-to-detonation transition |
| ISSN号 | 2214-157X |
| DOI | 10.1016/j.csite.2024.105574 |
| 通讯作者 | Liu, Yunfeng(liuyunfeng@imech.ac.cn) |
| 英文摘要 | The mechanisms of detonation instability, detonation quenching, deflagration-to-detonation transition, and thermodynamics of C-J deflagration are fundamental issues of combustion theory. In this paper, these mechanisms are discussed by analyzing the convective flux and heat release flux of one-dimensional numerical simulation. The governing equations are Euler equation with overall one-step chemical reaction kinetics. The mixture is stochiometric H2-air mixture at 1atm and 300K.The activation energy is increased to trigger the instability of C-J detonation. The numerical results show that the detonation instability is induced by the von Neumann spike. The von Neumann spike produces unsteady rarefaction wave, which is determined by the slope of von Neumann spike. The detonation is extinguished to a C-J deflagration abruptly under critical activation energy at one-time step because the strength of rarefaction wave is stronger than heat release under this critical condition. The C-J deflagration propagates with a relative constant velocity about half of C-J detonation velocity. The gas temperature and pressure behind the leading shock wave of C-J deflagration is too low to ignite the mixture. The Taylor wave from the end-wall ceases the mixture behind the leading shock, increases its temperature and decreases its pressure. As a result, combustion takes place at the contact surface with almost constant pressure. Therefore, the C-J deflagration is of constant-pressure combustion and this mechanism makes it propagate downstream with a relatively constant velocity for a long distance. |
| 分类号 | 一类 |
| WOS关键词 | TO-DETONATION TRANSITIONS ; FLAME ACCELERATION ; PROPAGATION MECHANISM ; OBSTACLES ; CHANNELS |
| WOS研究方向 | Thermodynamics |
| 语种 | 英语 |
| WOS记录号 | WOS:001372026700001 |
| 其他责任者 | Liu, Yunfeng |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/97756]  |
| 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.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China; |
| 推荐引用方式 GB/T 7714 | Liu YF. The thermodynamics of C-J deflagration[J]. CASE STUDIES IN THERMAL ENGINEERING,2024,64:22. |
| APA | 刘云峰.(2024).The thermodynamics of C-J deflagration.CASE STUDIES IN THERMAL ENGINEERING,64,22. |
| MLA | 刘云峰."The thermodynamics of C-J deflagration".CASE STUDIES IN THERMAL ENGINEERING 64(2024):22. |
入库方式： OAI收割
来源：力学研究所
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