Theoretical analysis on deflagration-to-detonation transition

• 来源期刊: 中国物理B（英文版）
• 关键词: deflagration detonation deflagration-to-detonation transition
• 年，卷（期）: 2018,（8）
• 页码范围: 356-359
• 页数: 4页
• 语种: 英文
• DOI: 10.1088/1674-1056/27/8/084703

摘要

The study on deflagration-to-detonation transition (DDT) is very important because this mechanism has relevance to safety issues in industries, where combustible premixed gases are in general use. However, the quantitative prediction of DDT is one of the major unsolved problems in combustion and detonation theory to date. In this paper, the DDT process is studied theoretically and the critical condition is given by a concise theoretical expression. The results show that a deflagration wave propagating with about 60％ Chapman–Jouguet (CJ) detonation velocity is a critical condition. This velocity is the maximum propagating velocity of a deflagration wave and almost equal to the sound speed of combustion products. When this critical condition is reached, a CJ detonation is triggered immediately. This is the quantitative criteria of the DDT process.