Effects of Soret diffusion on spherical flame initiation and propagation

doi:10.1016/j.ijheatmasstransfer.2014.11.062

CORC > 北京大学 > 工学院

	Effects of Soret diffusion on spherical flame initiation and propagation
	Han, Wang ; Chen, Zheng
刊名	国际传热与传质杂志
	2015
关键词	Soret diffusion Spherical flame propagation Markstein length Ignition LAMINAR BURNING VELOCITIES PROPANE-AIR MIXTURES PREMIXED FLAMES IGNITION ENERGY HYDROGEN-AIR TRANSPORT SPEED PLANAR MICROGRAVITY PRESSURES
DOI	10.1016/j.ijheatmasstransfer.2014.11.062
英文摘要	Dynamics of spherical flame initiation and propagation with Soret diffusion are investigated using large-activation-energy asymptotic analysis. Under the assumptions of constant density and quasi-steady flame propagation, a general correlation between the flame propagating speed and flame radius considering Soret diffusion and external energy deposition is derived. Emphasis is placed on assessing the effects of Soret diffusion on spherical flame propagation speed, Markstein length, and critical ignition condition. The stretched flame speed is found to be increased and reduced by the Soret diffusion of light and heavy fuels, respectively. For both light and heavy fuels, the absolute value of Markstein length increases after including Soret diffusion, indicating that premixed flames become more sensitive to stretch rate with Soret diffusion. It is found that the Markstein length can be characterized by an effective Lewis number which includes the effects of Soret diffusion. Moreover, Soret diffusion is shown to affect the ignition process since the spherical flame kernel is highly stretched. For large hydrocarbon fuels with high Lewis numbers, the minimum ignition power becomes much larger after considering Soret diffusion. (C) 2014 Elsevier Ltd. All rights reserved.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000348957300028&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Thermodynamics; Engineering, Mechanical; Mechanics; SCI(E); EI; 4; ARTICLE; cz@pku.edu.cn; 309-315; 82
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/154092]
专题	工学院
推荐引用方式 GB/T 7714	Han, Wang,Chen, Zheng. Effects of Soret diffusion on spherical flame initiation and propagation[J]. 国际传热与传质杂志,2015.
APA	Han, Wang,&Chen, Zheng.(2015).Effects of Soret diffusion on spherical flame initiation and propagation.国际传热与传质杂志.
MLA	Han, Wang,et al."Effects of Soret diffusion on spherical flame initiation and propagation".国际传热与传质杂志 (2015).