AUTOIGNITION CHARACTERISTICS OF COAL-WATER SLURRY FUELS FOR DIESEL ENGINE CONDITIONS: NUMERICAL RESULTS.
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The use of coal-water slurry fuels by reciprocating, internal-combustion engines poses several technological problems. One of these problems is the successful autoignition of the coal fuel for a range of engine conditions. A numerical model of a constant-volume combustion chamber was developed to interpret the results obtained elsewhere from a series of autoignition experiments. The numerical model was based on a thermodynamic analysis of the chamber contents and consisted of models for the injection, ignition, combustion, mixing and heat transfer. The thermodynamic analysis resulted in a set of first order non-linear, ordinary differential equations which were numerically integrated to obtain instantaneous cylinder gas, droplet and particle conditions. The numerical results were compared to experimental data for three initial gas temperatures (850, 920 and 1000 K). A specific set of literature values for the heterogeneous surface kinetics provided good agreement for all three temperatures.
author list (cited authors)
Caton, J. A., Bell, S. R., Richardson, K. D., & Koncke, K. F.