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Record Details

Record 1 of 36969
An experimental investigation on flame interaction and the existence of negative flame speeds
Author and Affiliation:
Sohrab, S. H.(Northwestern Univ., Evanston, IL, United States)
Ye, Z. Y.(Northwestern Univ., Evanston, IL, United States)
Law, C. K.(Northwestern University, Evanston, IL, United States)
Abstract: Downstream interaction between two counterflow premixed flames of different stoichiometries are investigated. Various flame configurations are observed and quantified; these include the binary system of two lean or rich flames, the triplet system of a lean and a rich flame separated by a diffusion flame, and single diffusion flames with some degree of premixedness. Extinction limits are determined for methane/air and butane/air mixtures over the entire range of mixture concentrations. Results show that these extinction limits can be significantly modified in the presence of interaction such that a mixture much beyond the flammability limit can still burn if it is supported by a stronger flame. The experiment also demonstrates the existence of negative flames whose propagation velocity is in the same general direction as that of the bulk convective flow. Implications of the present results on the flammability of stratified mixtures and on the modeling of turbulent flames are discussed.
Publication Date: Jan 01, 1985
Document ID:
19860038078
(Acquired Nov 28, 1995)
Accession Number: 86A22816
Subject Category: INORGANIC AND PHYSICAL CHEMISTRY
Document Type: Conference Paper
Publication Information: (SEE A86-22751)
Publisher Information: United States
Contract/Grant/Task Num: NAG3-361
Financial Sponsor: NASA; United States
Organization Source: Northwestern Univ.; Evanston, IL, United States
Description: 9p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: COMBUSTION PHYSICS; FLAME PROPAGATION; PREMIXED FLAMES; PROPAGATION VELOCITY; AIR; BINARY MIXTURES; BUTANES; COUNTERFLOW; FLAME TEMPERATURE; METHANE
Imprint And Other Notes: IN: Symposium (International) on Combustion, 20th, Ann Arbor, MI, August 12-17, 1984, Proceedings (A86-22751 09-25). Pittsburgh, PA, Combustion Institute, 1985, p. 1957-1964; Discussion, p. 1964, 1965.
Availability Source: Other Sources
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