Turbulent gaseous combustion part II: Theory and evaluation for local properties
✍ Scribed by Philip J. Smith; L.Douglas Smoot
- Publisher
- Elsevier Science
- Year
- 1981
- Tongue
- English
- Weight
- 482 KB
- Volume
- 42
- Category
- Article
- ISSN
- 0010-2180
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✦ Synopsis
A computer model has been developed for the analysis of confined, axisymmetric, turbulent diffusion flames. The fluid mechanics model includes the two-equation k-e turbulence model for closure. The combustion model is based on reactions limited by mixing rate with local chemical equilibrium. The mixture fraction is assumed to have a top-hap probability distribution, and transport equations are solved for the mean and variance of the mixture fraction. Local mean gas phase properties, including density and species concentration, are predicted. The coupled elliptical, nonlinear, partial differential equations are solved by an existing hybrid-differencing scheme. Predictions are made for reacting flow systems with re.circulation, and are shown to be sensitive to grid size and inlet turbulence level. Results are compared with experimental data reported in Part I and with data from other laboratories. Reasonable agreement is observed between measurement and theory for species concentration in aft regions of the combustor, with H 2 and CO comparisons being the least acceptable.