Rates of fuel conversion and heat release in turbulent combustion of methane-air mixtures in tunnel burners
Identifieur interne : 000D82 ( Istex/Curation ); précédent : 000D81; suivant : 000D83Rates of fuel conversion and heat release in turbulent combustion of methane-air mixtures in tunnel burners
Auteurs : Hans Kremer [Allemagne] ; Gerd Sch Fer [Allemagne]Source :
- Symposium (International) on Combustion [ 0082-0784 ] ; 1973.
Abstract
The experimental results presented in this paper deal with fuel conversion and heat-releaserates in experimental and commercial tunnel burners. Methane was used as fuel, and was premixed with air before entering the combustion chamber. Measurements of radial and axial distributions of temperature, concentration of stable components, and fluid velocity were used to calculate local conversion rates of combustibles and local heat-release rates. The effect of burner geometry, fuel throughput, air-fuel ratio, and turbulence intensity of the inlet mixture stream were also studied.The results show that the maximum local fuel-conversion rates and local heat-release rates occur in regions of large velocity gradients. The maximum heat-release rates obtained are much lower than in a homogeneous reactor. When the fuel throughput exceeds certain limits, unburned gases escape from the burner, resulting in lower mean combustion efficiencies.Combustion efficiencies close to 1 can only be achieved for an excess of air of more than 20 per cent stoichiometric.Conclusions for the optimum design of tunnel burners are drawn.
Url:
DOI: 10.1016/S0082-0784(73)80066-9
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