Asymptotic theory of flame extinction with surface radiation

Journal Article · Thu Dec 31 23:00:00 EST 1992 · Combustion and Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(93)90195-9· OSTI ID:7138952

Chao, B H; Law, C K ^[1]

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1. Princeton Univ., NJ (United States). Dept. of Mechanical and Aerospace Engineering

This paper reports that in order to further understand the general structure and extinction characteristics of diffusion and premixed flames in the presence of heat loss, and their dependence on the relative rates of reaction, transport, and loss, the heterogeneous combustion with surface radiative heat loss from either a bipropellant in an oxidizing counterflow or a monopropellant in an inert counterflow have been studied via activation energy asymptotics. The analysis yields solutions for the flame temperature, mass burning rate, and flamefront standoff distance. The structure equations for the reaction zone of both the diffusion flame and the premixed flame with subadiabatic downstream boundary are, respectively, found to be canonically identical to the near-equilibrium and premixed flame regimes of Li[tilde n][acute a]n's generalized analysis of the diffusion flame structure. The actual flame response to stretch rate variations, however, exhibits a dual extinction turning point behavior in that flame extinction occurs not only for sufficiently large stretch rates and minimal radiative heat loss but also for sufficiently small stretch rates and extensive heat loss.

• OSTI ID: 7138952
• Journal Information: Combustion and Flame; (United States), Journal Name: Combustion and Flame; (United States) Vol. 92:1-2; ISSN CBFMAO; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
ACTIVATION ENERGY
ASYMPTOTIC SOLUTIONS
CHEMICAL REACTIONS
COMBUSTION
COUNTERFLOW SYSTEMS
DIFFUSION
ELECTROMAGNETIC RADIATION
ENERGY
ENERGY LOSSES
EQUATIONS
FLAMES
HEAT LOSSES
LOSSES
MIXING
OXIDATION
PROPELLANTS
RADIATIONS
STEADY-STATE CONDITIONS
STRAIN RATE
SURFACES
TEMPERATURE DISTRIBUTION
THERMAL RADIATION
THERMOCHEMICAL PROCESSES
TRANSPORT THEORY