Modification and improvement of software for modeling multidimensional reacting fuel flows. Final report, 1 November 1986-31 January 1989
The flame type of most practical combustion devices is the diffusion flame. These flames are important in the interaction of heat and mass transfer with chemical reactions in ramjets, jet turbines and commercial burners. Three-dimensional models that couple the effects of fluid flow with detailed chemical reaction are as yet computationally infeasible. We focus our attention on axisymmetric laminar and turbulent diffusion flames in which a cylindrical fuel stream is surrounded by a coflowing oxidizer jet. In this configuration we can study the interaction of fluid flow with chemical reactions while obtaining a computationally feasible problem. The work centers on the development and application of accurate and efficient computational methods for the solution of the two-dimensional nonlinear boundary value problems describing the reacting systems. In particular, our goals involve the generalization of our one-dimensional fluid-chemistry model to two dimensions. We also focus on the use of two-dimensional flame sheet models as starting estimates for the nonlinear equation solver. Both confined and free methane-air flames have been studied. The results of the research are applicable to problems in (1) turbulent reacting flows, (2) engine efficiency, (3) commercial power generation units and (4) pollutant formation.
- Research Organization:
- Scientific Computing Associates, Inc., New Haven, CT (USA)
- OSTI ID:
- 6901549
- Report Number(s):
- AD-A-217789/7/XAB; SCA-142
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
FLAMES
MATHEMATICAL MODELS
BOUNDARY-VALUE PROBLEMS
BURNERS
CHEMICAL REACTIONS
CHEMISTRY
COMBUSTION
COMPUTER CODES
COUPLING
DIFFUSION
ELECTRIC POWER
ENGINES
FLUID FLOW
FLUID MECHANICS
FUELS
HEAT
LAMINAR FLOW
MASS TRANSFER
NEWTON METHOD
NONLINEAR PROBLEMS
POLLUTANTS
PROGRESS REPORT
RAMJET ENGINES
TURBULENCE
TWO-DIMENSIONAL CALCULATIONS
DOCUMENT TYPES
ENERGY
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
ITERATIVE METHODS
MECHANICS
OXIDATION
POWER
THERMOCHEMICAL PROCESSES
400800* - Combustion
Pyrolysis
& High-Temperature Chemistry