On the Structure of Laminar Diffusion Flames

On the Structure of Laminar Diffusion Flames
Author: Amable Liñán
Publisher:
Total Pages: 43
Release: 1963
Genre: Electronic dissertations
ISBN:

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The structure of laminar diffusion flames is analyzed in the limiting case of large, although finite, reaction rates. It is shown that the chemical reaction takes place only in a very thin region or chemical boundary layer where convection effects may be neglected. Then the temperature and mass fraction distributions within the reaction zone are obtained analytically. The flame position, rates of fuel consumption, and temperature and concentration distributions outside of the reaction zone may be obtained by using the assumption of infinite reaction rates. For large Reynolds numbers mixing and combustion take place in boundary layers and free mixing layers. And again analytical solutions are obtained for the temperature and mass fraction distributions outside of the reaction zone. (Author).

On the Structure of Gaseous Confined Laminar Diffusion Flames

On the Structure of Gaseous Confined Laminar Diffusion Flames
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
Total Pages: 26
Release: 2018-07-09
Genre:
ISBN: 9781722457822

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The structure and characteristics of gaseous confined laminar diffusion flames are investigated by numerically solving the time-dependent two-dimensional axisymmetric conservation equations. The numerical model accounts for the important chemical and physical processes involved, including axial diffusion, viscous effects, radial convection, and finite-rate chemistry. The numerical results clearly show that the flame has a finite thickness and leakage of fuel vapor into the flame zone is possible. The effect of heat release is found to induce some radial flow. Predicted flame shape and dimensions are compared to the classical Burke-Schumann flame. The numerically calculated flame is observed to be about 15 percent taller and 5 percent narrower than that of the Burke-Schumann solution under the same conditions. Mawid, M. A. and Bulzan, D. L. and Aggarwal, S. K. Glenn Research Center RTOP 505-62-21...