Influence of exothermicity on the shape of a diffusion flame
The effects of exothermicity of combustion on the contours of gaseous, unconfined, planar and axi-symmetric, jet diffusion flames, as well as on the structures of their flow fields, are analyzed. For the sake of clarity, the problem is formulated in the simplest possible way. The flame is treated as essentially laminar, the reaction rates are considered infinite, the medium is assumed to behave as a perfect gas with constant specific heats, its Schmidt and Prandtl numbers being unity and viscosity proportional to the temperature, while the buoyancy effects are neglected. Under such circumstances the problem lends itself to treatment by the Shvab-Zeldovich technique. The results, derived as an inverse to self-similar solutions in the incompressible domain obtained by a Dorodnitsyn-Howarth transformation of the governing equations for compressible flow, are expressed in terms of algebraic formulae. In applications to hydrogen-air and a number of hydrocarbon-air mixtures, they turn out to be in an amazing agreement with experimental data under zero gravity conditions.
- Research Organization:
- Lawrence Berkeley Lab., CA (USA); Technion-Israel Inst. of Tech., Haifa
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5359501
- Report Number(s):
- LBL-13673; CONF-820801-6; ON: DE82005766
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
034000 -- Natural Gas-- Combustion
08 HYDROGEN
080800* -- Hydrogen-- Properties & Composition
090110 -- Hydrocarbon Fuels-- Properties-- (1979-1989)
10 SYNTHETIC FUELS
AIR
ALKANES
ALKENES
CHEMICAL REACTIONS
COMBUSTION
DIFFUSION
ELEMENTS
ETHYLENE
FLAMES
FLUIDS
GASES
HYDROCARBONS
HYDROGEN
MATHEMATICAL MODELS
METHANE
NONMETALS
ORGANIC COMPOUNDS
OXIDATION
PRANDTL NUMBER
PROPYLENE
SHAPE
THERMOCHEMICAL PROCESSES
VISCOSITY