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Near limit premixed flamelets in Hele-Shaw cells
Chen XT; Lu ZB; Wang SF(王双峰); Lu, ZB (reprint author), Shanghai Univ, Inst Appl Math & Mech, Shanghai 200072, Peoples R China.
AbstractIn 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.
KeywordPremixed Flame Flame Cylinder Hele-shaw Cell Near Limit Narrow Channel
Indexed BySCI
WOS IDWOS:000397464200163
WOS Research AreaThermodynamics ; Energy & Fuels ; Engineering
WOS SubjectThermodynamics ; Energy & Fuels ; Engineering, Chemical ; Engineering, Mechanical
Funding OrganizationNational Science Foundation of China(50706024 ; Shanghai Rising Star Program(09QA1402300) ; Strategic Pioneer Program on Space Science Chinese Academy of Sciences(XDA04020410) ; 11472167)
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Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorLu, ZB (reprint author), Shanghai Univ, Inst Appl Math & Mech, Shanghai 200072, Peoples R China.
Recommended Citation
GB/T 7714
Chen XT,Lu ZB,Wang SF,et al. Near limit premixed flamelets in Hele-Shaw cells[J]. PROCEEDINGS OF THE COMBUSTION INSTITUTE,2017,36(1):1585-1593.
APA Chen XT,Lu ZB,王双峰,&Lu, ZB .(2017).Near limit premixed flamelets in Hele-Shaw cells.PROCEEDINGS OF THE COMBUSTION INSTITUTE,36(1),1585-1593.
MLA Chen XT,et al."Near limit premixed flamelets in Hele-Shaw cells".PROCEEDINGS OF THE COMBUSTION INSTITUTE 36.1(2017):1585-1593.
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