![]() ![]() When the engine speed increased, the combustion speed increased but the combustion duration in crank angles went up by a few degrees. ![]() ![]() It can be seen that the combustion speed was the highest at the low speed middle load operation in the pure CAI operation zone, where the combustion duration was less than 8 degree crank angle. Cairns, in Internal Combustion Engines: Improving Performance, Fuel Economy and Emissions: IMechE, London, 29–30 November 2011, 2011 3.2 Combustion processįigure 4c shows the combustion duration over the CAI operating range, which in this paper is defined as the crank angles from 10% mass fraction burnt to 90% mass fraction burnt.
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