Coupled radiation and soot kinetics calculations in laminar acetylene/air diffusion flames

Journal Article · Sun May 01 00:00:00 EDT 1994 · Combustion and Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(94)90003-5· OSTI ID:7184983

Sivathanu, Y R; Gore, J P ^[1]

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1. Purdue Univ., West Lafayette, IN (United States). School of Mechanical Engineering

Radiation heat transfer from flames depends on the instantaneous soot volume fractions and temperatures. A coupled radiation and soot kinetics calculation in laminar acetylene/air and acetylene-methane/air diffusion flames is described. Transport equations for mass, momentum, gas-phase mixture fraction, enthalpy (sensible + chemical), soot mass fraction, and soot number density are solved. A simplified soot kinetics model incorporating nucleation, growth, oxidation, and agglomeration processes is used. The reaction rates in the simplified kinetics model depend on the temperature and the local concentrations of acetylene and oxygen. The major gas species concentrations are obtained from state relationships. The local temperature is obtained by solving the energy equation, taking radiation loss and gain and the energy exchanges associated with soot formation and oxidation into consideration. The radiative source/sink term in the energy equation is obtained using a multiray method. Since these flames radiate a substantial part of their energy, the kinetic rates associated with soot processes are strongly coupled to the energy equation. This strong coupling between radiation, and soot formation and oxidation processes is modeled for the first time. The results of the soot kinetics model are compared with measurements of soot volume fractions obtained using laser tomography. The agreement between measurements and predictions of soot volume fractions supports the present method. The predicted temperature profiles support of strongly radiating flames discovered earlier.

• OSTI ID: 7184983
• Journal Information: Combustion and Flame; (United States), Journal Name: Combustion and Flame; (United States) Vol. 97:2; ISSN CBFMAO; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
034000 -- Natural Gas-- Combustion
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
ACETYLENE
ALKANES
ALKYNES
CHEMICAL REACTION KINETICS
COMBUSTION KINETICS
CONCENTRATION RATIO
ENERGY TRANSFER
EQUATIONS
HEAT TRANSFER
HYDROCARBONS
KINETIC EQUATIONS
KINETICS
MATHEMATICAL MODELS
METHANE
ORGANIC COMPOUNDS
RADIANT HEAT TRANSFER
REACTION KINETICS