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Structure of Propagating and Attached Hydrocarbon FlamesDirect numerical simulations with C3-chemistry and radiative heat-loss models have been performed to reveal the internal structure of propagating and attached flames in an axisymmetric fuel jet of methane, ethane, ethylene, acetylene, or propane in air under normal and zero gravity. Observations of the flames were also made at the NASA Glenn 2.2-Second Drop Tower. In computations, the fuel issued into quasi-quiescent air for a fixed mixing time before it was ignited along the centerline at stoichiometry. The edge of the flame propagated through a flammable layer at the laminar flame speed of the stoichiometric fuel-air mixture independent of gravity. For all cases, a peak reactivity spot, i.e., reaction kernel, was formed in the flame base, thereby holding a trailing diffusion flame. The location of the reaction kernel in the attached flames depended inversely on the reactivity. The reaction-kernel correlations between the reactivity and the velocity were developed further using variables related to local Damkahler and Peclet numbers.
Document ID
20050203888
Acquisition Source
Glenn Research Center
Document Type
Conference Paper
Authors
Takahashi, Fumiaki
(National Center for Microgravity Research on Fluids and Combustion Cleveland, OH, United States)
Katta, Viswanath
(Solutions, Inc. United States)
Date Acquired
September 8, 2013
Publication Date
January 1, 2004
Subject Category
Propellants And Fuels
Meeting Information
Meeting: 2004 Technical Meeting of the Central States Section of the Combustion Institute
Location: Austin, TX
Country: United States
Start Date: March 21, 2004
End Date: March 23, 2004
Sponsors: Combustion Inst.
Funding Number(s)
CONTRACT_GRANT: NCC3-975
WBS: WBS 22-101-58-09
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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