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Cyclic flame propagation in premixed combustion

Boettcher, Philipp A. and Menon, Shyam K. and Ventura, Brian and Blanquart, Guillaume and Shepherd, Joseph E. (2013) Cyclic flame propagation in premixed combustion. Journal of Fluid Mechanics, 735 . pp. 176-202. ISSN 0022-1120. http://resolver.caltech.edu/CaltechAUTHORS:20131204-164020799

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Abstract

In experiments of hot surface ignition and subsequent flame propagation, a puffing flame instability is observed in mixtures that are stagnant and premixed prior to ignition. By varying the size of the hot surface, power input, and combustion vessel volume, it was determined that the instability is a function of the interaction of the flame, with the fluid flow induced by the combustion products rather than the initial plume established by the hot surface. Pressure ranges from 25 to 100 kPa and mixtures of n-hexane/air with equivalence ratios between ϕ = 0:58 and 3.0 at room temperature were investigated. Equivalence ratios between ϕ = 2:15 and 2.5 exhibited multiple flame and equivalence ratios above ϕ = 2:5 resulted in puffing flames at atmospheric pressure. The phenomenon is accurately reproduced in numerical simulations and a detailed flow field analysis revealed competition between the inflow velocity at the base of the flame and the flame propagation speed. The increasing inflow velocity, which exceeds the flame propagation speed, is ultimately responsible for creating a puff. The puff is then accelerated upward, allowing for the creation of the subsequent instabilities. The frequency of the puff is proportional to the gravitational acceleration and inversely proportional to the flame speed. A scaling relationship describes the dependence of the frequency on gravitational acceleration, hot surface diameter, and flame speed. This relation shows good agreement for rich n-hexane/air and lean hydrogen/air flames, as well as lean hexane/hydrogen/air mixtures.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1017/jfm.2013.495DOIArticle
http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=9052794PublisherArticle
http://journals.cambridge.org/action/downloadSuppMaterialRoute?file=/FLM13005_SupplementaryMaterial1.txtPublisherData Supplement
http://journals.cambridge.org/action/downloadSuppMaterialRoute?file=/FLM13005_SupplementaryMaterial2.datPublisherData Supplement
ORCID:
AuthorORCID
Blanquart, Guillaume0000-0002-5074-9728
Shepherd, Joseph E.0000-0003-3181-9310
Additional Information:©2013 Cambridge University Press Received October 30 2012; revised August 16 2013; accepted September 13 2013; online publication October 23 2013. The authors gratefully acknowledge funding for this research by the Boeing Company through Strategic Research and Development Relationship Agreement CTBA-GTA-1.
Group:GALCIT
Funders:
Funding AgencyGrant Number
Boeing Company Strategic Research and Development Relationship CT-BA-GTA-1
Subject Keywords:buoyancy-driven instability, combustion, flames
Record Number:CaltechAUTHORS:20131204-164020799
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20131204-164020799
Official Citation:Philipp A. Boettcher, Shyam K. Menon, Brian L. Ventura, Guillaume Blanquart and Joseph E. Shepherd (2013). Cyclic flame propagation in premixed combustion. Journal of Fluid Mechanics, 735, pp 176-202 doi:10.1017/jfm.2013.495
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42842
Collection:CaltechAUTHORS
Deposited By: David McCaslin
Deposited On:05 Dec 2013 19:46
Last Modified:22 Sep 2016 22:31

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