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Title:
Near limit premixed flamelets in Hele-Shaw cells
Author: Chen XT; Lu ZB; Wang SF(王双峰)
Source: PROCEEDINGS OF THE COMBUSTION INSTITUTE
Issued Date: 2017
Volume: 36, Issue:1, Pages:1585-1593
Abstract: In this paper we report a preliminary attempt to stabilize near limit premixed flamelets in Hele-Shaw cells. As a quasi-two-dimensional analog of flame balls the flamelet is sustained by diffusive transport alone with fuel supplied from the open ends of the Hele-Shaw cell and heat dissipated to the ambient environment through conduction; radiative heat losses from both phases are neglected. Following Spalding's "one-dimensional idealization" approximation we construct a 2-D model to account for the heat and mass transfer processes in both the gas and the solid phases with the gap height as a parameter controlling the heat exchange rate between the two phases. For each of the three kinds of wall materials considered two steady solution branches are obtained as a function of the gap height one corresponding to large flames and the other to small flames. The large flame branch is critically dependent on the boundary and is therefore of little physical value. Linear stability analysis shows that the small flame branch is unstable to random perturbations. 2-D time dependent numerical simulations indicate that a slightly perturbed steady state on the small flame branch either evolves into a single flamelet drifting to the boundary as a whole or splits into two drifting to the boundary along opposite directions. A partially open square Hele-Shaw combustor has been proposed and is shown to be able to support stabilized flamelets for a certain range of the degree of opening. (C) 2016 by The Combustion Institute. Published by Elsevier Inc.
Keyword: Premixed flame ; Flame cylinder ; Hele-Shaw cell ; Near limit ; Narrow channel
Language: 英语
Indexed Type: SCI
DOI: 10.1016/j.proci.2016.08.059
DOC Type: Article
WOS Subject: Thermodynamics ; Energy & Fuels ; Engineering, Chemical ; Engineering, Mechanical
WOS Subject Extended: Thermodynamics ; Energy & Fuels ; Engineering
WOS Keyword Plus: COMBUSTION ; STABILITY ; BALLS ; LOSSES ; NUMBER ; MICRO
WOS ID: WOS:000397464200163
ISSN: 1540-7489
Funder: National Science Foundation of China(50706024 ; Shanghai Rising Star Program(09QA1402300) ; Strategic Pioneer Program on Space Science Chinese Academy of Sciences(XDA04020410) ; 11472167)
Department: NML微重力两相流与燃烧
First Institution (Yes or Not): false
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Content Type: 期刊论文
URI: http://dspace.imech.ac.cn/handle/311007/60601
Appears in Collections:国家微重力实验室_期刊论文

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Recommended Citation:
Chen XT,Lu ZB,Wang SF. Near limit premixed flamelets in Hele-Shaw cells[J]. PROCEEDINGS OF THE COMBUSTION INSTITUTE,2017-01-01,36(1):1585-1593.
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