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  • 1
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    A mathematical model of a large open fire (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A mathematical model capable of predicting the detailed characteristics of large, liquid fuel, axisymmetric, pool fires is described. The predicted characteristics include spatial distributions of flame gas velocity, soot concentration and chemical specie concentrations including carbon monoxide, carbon dioxide, water, unreacted oxygen, unreacted fuel and nitrogen. Comparisons of the predictions with experimental values are also given.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-166475 , NAS 1.26:166475
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Multiple-scale turbulence modeling of boundary layer flows for scramjet applications (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: As part of an investigation into the application of turbulence models to the computation of flows in advanced scramjet combustors, the multiple-scale turbulence model was applied to a variety of flowfield predictions. The model appears to have a potential for improved predictions in a variety of areas relevant to combustor problems. This potential exists because of the partition of the turbulence energy spectrum that is the major feature of the model and which allows the turbulence energy dissipation rate to be out of phase with turbulent energy production. The computations were made using a consistent method of generating experimentally unavailable initial conditions. An appreciable overall improvement in the generality of the predictions is observed, as compared to those of the basic two-equation turbulence model. A Mach number-related correction is found to be necessary to satisfactorily predict the spreading rate of the supersonic jet and mixing layer.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: NASA-CR-3433 , SAI-80-022-CP
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Analytic modeling of a spray diffusion flame (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A detailed model for a spray diffusion flame is described. The model is based on the boundary layer form of the equations of motion, with droplet transport accounted for using a discretized droplet size distribution function. Interphase transport of mass and energy are accounted for, with a flame-sheet model used to describe the combustion process on a droplet scale. Near dynamic equilibrium is assumed for the description of droplet transport; droplets can diffuse relative to the gas phase. Gas-phase mixing is accounted for using a two-equation turbulence model; buoyancy effects are included, with a temperature fluctuation equation used to account for buoyancy effects on turbulence structure. Thermal radiation from gas-phase CO2 and H2O is included. Gas-phase chemical kinetics are modeled using a 20-reaction, 10-species version of the advanced quasi-global chemical kinetics formulation. Results are compared with data for a vaporizing Freon spray and a pentane spray flame. It is shown that the computational approach provides a reasonably valid picture of the overall development of a spray diffusion flame, and, furthermore, provides a useful tool for the parametric examination of the spray combustion process.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 84-1317
    Format: text
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