Study of the Effect of Combustion Chamber Shapes on the Mixture Formation and Combustion Characteristic on CNG-DI Engine

摘要: A combustion system model of CNG-DI engine which was modified from a 2.0 L diesel built with software FIRE, the turbulence verified experimental result optical engine, on condition unchanged 4 valves structure original and jet location, spark plug arranged between two exhaust valves, effect different chamber shapes microscopic physical fields such as characteristic in cylinder simulated studied, based formation mixture rule NO researched. The shows that he shape has tremendous influence distribution characteristics concentration especially besides plug, plays decisive role whole process combustion; Not only production can be inhibited propagation speed is favour lean burn controlled effectively when straight mouth used at bottom proper embossment. amount closely related to size reaction area duration rate CNG fuel injected into directly burned thin, by rational design chamber.