Parallel simulations of partially stirred methane combustion

Journal Article · Wed Sep 01 00:00:00 EDT 1993 · Combustion and Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(93)90128-P· OSTI ID:6176853

Correa, S M; Braaten, M E ^[1]

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

Premixed methane combustion in a partially stirred reactor (PaSR) is studied numerically. The effects of turbulent stirring rate on NO, CO, and other quantities are computed. The chemistry is represented by a full scheme (27 species, 77 reactions) in the baseline study. Turbulence is accounted for by the IEM (Interaction-by-Exchange-with-the-Mean) submodel. The PaSR is described by a system of (N[sub s] + 1) x N[sub p] first-order coupled o.d.e.'s in time, where N[sub s] [equivalent to] number of species, and N[sub p] [equivalent to] number of particles. The speedup over serial computers is essentially linear in the number of processors used, until the number of particles per processor becomes small enough (<10) to affect load balance. The conditions are 30 atm, 1,200-K inlet temperature, 800-K equilibrium temperature rise, and 2-ms reactor residence time. PaSR simulations are conducted in the range 100-5,000 Hz (mixing frequency), and in each case converge to a stochastic steady state and span the PFR-PSR limits smoothly. The correlation of NO with particle age decreases as frequency increases, and is within expected limits. The OH levels are uniform to within a factor of two in this frequency range, which is consistent with the distributed OH structures observed in turbulent diffusion flames. Simulations with a 25-step skeletal scheme agreed well with the baseline study above 1,000 Hz, but are about 400 K low on mean temperature at 100 Hz. The corresponding four-step reduced scheme failed to ignite in all cases, suggesting a need for reduced schemes which do not assume that the radicals are in a chemically steady state.

• OSTI ID: 6176853
• Journal Information: Combustion and Flame; (United States), Journal Name: Combustion and Flame; (United States) Vol. 94:4; ISSN CBFMAO; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
030700 -- Natural Gas-- Waste Management
034000* -- Natural Gas-- Combustion
ALKANES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
COMBUSTION KINETICS
COMBUSTORS
COMPUTER CALCULATIONS
FLUID FLOW
HYDROCARBONS
HYDROXYL RADICALS
KINETICS
MATHEMATICAL MODELS
METHANE
MIXING
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RADICALS
REACTION KINETICS
TURBULENT FLOW
YIELDS