Supersonic reaction front propagation initiated by a hot spot in   n-heptane/air mixture with multistage ignition

doi:10.1016/j.combustflame.2015.08.002

CORC > 北京大学 > 工学院

	Supersonic reaction front propagation initiated by a hot spot in n-heptane/air mixture with multistage ignition
	Dai, Peng ; Chen, Zheng
刊名	COMBUSTION AND FLAME
	2015
关键词	Autoignition Detonation Hot spot n-Heptane Multistage ignition LAMINAR FLAME SPEED TEMPERATURE-GRADIENT SPHERICAL FLAMES HIGH-PRESSURE PRE-IGNITION COMBUSTION DETONATION ENGINES AUTOIGNITION REGIME
DOI	10.1016/j.combustflame.2015.08.002
英文摘要	For large hydrocarbon fuels such as n-heptane, multistage ignition occurs at low initial temperature. Therefore, multiple pressure pulses produced by multistage ignition and complitated reaction-pressure wave interactions are expected to happen during autoignition and reaction front propagation initiated by a hot spot. In this study, 1D simulations are conducted for n-heptane/air mixture with three ignition stages respectively caused by low-, intermediate- and high-temperature chemistries. Multiple pressure waves, shock waves, and detonation waves are identified and they are found to be generated by heat release from different ignition stages and reaction-pressure wave interactions. The thermal states of flow particles at different initial locations are tracked and analyzed; and the mechanism for the development of multiple shock waves and detonation waves is discussed. With the change of temperature gradient inside the hot spot or the hot spot size, such interactions can be strengthened or weakened and thereby the mode of supersonic reaction front propagation changes. Furthermore, both planar and spherical configurations are considered and the curvature effects are examined. It is found that in spherical configuration, the pressure wave caused by intermediate-temperature ignition is not strong enough to induce a second detonation wave as that in planar configuration. (C) 2015 The Combustion Institute. Published by Elsevier Inc. All rights reserved.; National Natural Science Foundation of China [51322602]; China Postdoctoral Science Foundation [2015M570011]; State Key Laboratory of Engines at Tianjin University [K2014-01]; SCI(E); ARTICLE; cz@pku.edu.cn; 11; 4183-4193; 162
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/415369]
专题	工学院
推荐引用方式 GB/T 7714	Dai, Peng,Chen, Zheng. Supersonic reaction front propagation initiated by a hot spot in n-heptane/air mixture with multistage ignition[J]. COMBUSTION AND FLAME,2015.
APA	Dai, Peng,&Chen, Zheng.(2015).Supersonic reaction front propagation initiated by a hot spot in n-heptane/air mixture with multistage ignition.COMBUSTION AND FLAME.
MLA	Dai, Peng,et al."Supersonic reaction front propagation initiated by a hot spot in n-heptane/air mixture with multistage ignition".COMBUSTION AND FLAME (2015).