NUMERICAL-SIMULATION OF A COAL-FUELED COMPRESSION-IGNITION ENGINE
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A numerical simulation of a coal-fuelled, reciprocating, internal combustion engine was developed and was used to: 1. (1) investigate the details of the combustion process; 2. (2) identify process controlling phenomena; 3. (3) evaluate the engine performance characteristics with a coal fuel; and 4. (4) establish directions for future coalfuelled engine research. The simulation utilized models for coal particle combustion and devolatilization, liquid droplet vaporization, fuel vapour combustion, cylinder heat transfer and mass flow rates through intake and exhaust valves. Results from the simulation showed that the cylinder conditions at the point of fuel injection were important parameters that could significantly affect the ignition and combustion characteristics of the fuel. Cylinder conditions could be such that misfire in the engine would occur. For the engine conditions studied, the ignition delay time for the coal fuels were longer than those for diesel fuel. Once ignited, the coal fuel exhibited good combustion characteristics with relatively short combustion durations. The combustion process was primarily mixing limited, although the coal fuel exhibited a longer kinetic burning period than the diesel fuel. At the engine operating conditions investigated, the overall engine performance was similar for coal and diesel fuels. 1988.
