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Heat transfer during laminar flow flame quenching: effect of fuels

Conference ·
OSTI ID:5750445
; ;
Wall heat fluxes were obtained in a constant volume combustion chamber for methane-air, ethylene-air and propane-air mixtures. The experiments were performed at pressure near atmospheric over a range of equivalence ratios from 0.8 to 1.2. The unsteady heat fluxes for the three fuels were all correlated by using the heat release rates of the flames prior to quenching and the thermal diffusivity and the flame speed. The calculations were made using a finite difference method and an integral method. Two step chemical kinetics was used in the finite difference calculations and a simplified ignition temperature approach was employed in the integral method. The results from the finite difference calculation were in good agreement with the experimental data. In the integral method, choosing a single value for the dimensionless ignition temperature for all three fuels also yielded good agreement with the experimental data. The maximum wall heat flux accounts for one third of the steady laminar flame heat release rate for three fuels. 20 refs., 6 figs., 2 tabs.
Research Organization:
Lawrence Berkeley Lab., CA (USA)
DOE Contract Number:
AC03-76SF00098
OSTI ID:
5750445
Report Number(s):
LBL-20863; CONF-860804-9; ON: DE86007490
Country of Publication:
United States
Language:
English

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Related Subjects

03 NATURAL GAS
034000 -- Natural Gas-- Combustion
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
AIR
ALKANES
ALKENES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COMBUSTION
COMBUSTION KINETICS
DISPERSIONS
ENERGY TRANSFER
ETHYLENE
FINITE DIFFERENCE METHOD
FLAME PROPAGATION
FLAMES
FLUID FLOW
FLUIDS
GASES
HEAT FLUX
HEAT TRANSFER
HYDROCARBONS
IGNITION
ITERATIVE METHODS
KINETICS
LAMINAR FLOW
METHANE
MIXTURES
NUMERICAL SOLUTION
ORGANIC COMPOUNDS
OXIDATION
PROPANE
QUENCHING
REACTION KINETICS
THERMOCHEMICAL PROCESSES