内容简介：

There are two types of self-propagating combustion waves: deflagration and detonation. A deflagration wave, commonly called as flame, propagates at relatively low subsonic velocities with respect to the reactants ahead of it; while a detonation can be considered as a supersonic reacting shock wave propagating towards the reactants. Under certain conditions, deflagration-to-detonation transition (DDT) may occur. DDT is an important problem since it is associated with engine knock, accidental explosion, and physics of thermonuclear Supernova Type Ia. Currently, DDT is one of the major challenging problem in combustion since and the mechanism of DDT is still not well understood. This presentation will discuss the transition from fast flame to detonation. In previous studies DDT usually occurs with the help of the appearance of obstacles, boundary layers, or turbulent mixing. However, in this talk it will be shown that even in 1D flow only with an initial propagating flame, detonation can still be developed. Furthermore, it will be demonstrated that such kind of DDT occurs in both confined space and unconfined space. The mechanism for DDT will be discussed.

报告人简介：

陈正，澳门太阳娱乐网站官网研究员、博士生导师。2001年和2003年在清华大学工程力学系分别获学士和硕士学位，2009年1月在普林斯顿大学获博士学位，然后到澳门太阳娱乐网站官网工作。从事与能源和推进技术相关的基础燃烧研究，主要研究方向为燃烧火焰动力学。先后主持了国家自然科学基金、教育部博士点基金等科研项目。研究内容包括火焰动力学理论、燃料基础燃烧特性、极限燃烧、等离子体助燃机理等。曾获得国际燃烧协会授予的Bernard Lewis Fellowship（2008）、亚太燃烧会议授予的Young Investigator Prize（2015），入选国际期刊Combustion and Flame的编委（2017-2022）。

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