Turbulence-chemistry interactions in the intermediate regime of premixed combustion

Journal Article · Wed Mar 31 23:00:00 EST 1993 · Combustion and Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(93)90083-F· OSTI ID:6566032

Correa, S M ^[1]

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1. General Electric Research Center, Schenectady, NY (United States)

A numerical model for the partially stirred reactor (PaSR) is developed, and the effects of turbulence on NO, CO, and other quantities are computed. Turbulent mixing is accounted for by the Interaction-by-Exchange-with-the-Mean submodel. Combustion of a 50% CO/50% H[sub 2] (by vol.) fuel premixed with air is considered, represented by 18 species and 43 reactions. In the limit of mixing frequency becoming small, the solutions tend to those of the plug flow as expected. NO and CO increase with mixing frequency. In the range of time scales relevant to turbulent combustion, NO increases by a factor of about 2 as the mixing time becomes small enough to effect the concentration of oxyhydrogen radical while CO increases by over an order of magnitude. These variations agree qualitatively with experimental data from turbulent combustors. In-combustor stirring clearly plays a large role even in premixed combustion. The algorithm converges to the perfectly stirred reactor solution at large mixing frequencies. The partial equilibrium model is found to be reasonable for CO/H[sub 2] fuels int eh present range of conditions, and effects a computational speedup by a factor on the order of 100. Besides providing a useful combustion model, the PaSR provides a test-bed for mixing models, for simplified chemical schemes, and for algorithms intended for particle-tracking pdf transport models.

• OSTI ID: 6566032
• Journal Information: Combustion and Flame; (United States), Journal Name: Combustion and Flame; (United States) Vol. 93:1-2; 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
ALGORITHMS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COMBUSTION KINETICS
COMBUSTORS
EMISSION
ENGINES
EQUIPMENT
FLUID FLOW
FLUIDS
GAS TURBINES
GASES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
KINETICS
MACHINERY
MATHEMATICAL LOGIC
MATHEMATICAL MODELS
MIXING
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
RADICALS
REACTION INTERMEDIATES
REACTION KINETICS
SPARK IGNITION ENGINES
SYNTHESIS GAS
TURBINES
TURBOMACHINERY
TURBULENT FLOW