Analysis of Flow Field and Combustion Process in Cylinder of Elliptical Rotary Engine
The gas exchange and combustion process of an elliptical rotary engine with gasoline as fuel were studied,the variation of the flow field and flame propagation process in the cylinder were defined,and the combustion and pollutant generation characteristics under different equivalent ratios mixtures were analyzed.The results show that,during the intake process of elliptical rotary engine,large vortices are formed on both sides of the combustion chamber;Two vortices are formed in the spherical combustion chamber and the cylinder at the end of air intake;At the end of combustion,there is an unburned area near the vertex seal;In the exhaust phase,the intake scavenging during the overlap period accelerates the exhaust process;With the increase of the equivalent ratio,the pressure and temperature in the cylinder rise faster,the peak value is larger,when the equivalent ratio is 1.1,the pressure and temperature reach the maximum value;With the increase of equivalent ratio,the temperature in the cylinder rises,resulting in a significant increase in CO and NOx generation;But the equivalent ratio is too large,resulting in incomplete combustion,CO generation significantly increased,but the pressure and temperature in the cylinder are reduced,resulting in the reduction of NOx generation.
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