Abstract
The in-cylinder flow dramatically affects combustion performance and emission characteristics of a compression ignition engine. The spray cone angle is among the most critical factors affecting mixture formation, combustion and emissions in a direct injection diesel engine. We have used three-dimensional computational investigations on spray cone angle-induced emission pattern of V-type DI engine under AVL-FIRE and ESE simulation interface. Four spray cone angles of 120°, 130°, 140°, and 150° were used for simulation purpose. The findings from the three-dimensional AVL-FIRE simulation confirm the influence of spray angle on optimal air-fuel mixing and, hence, combustion. Spray cone angle of 140° gave better engine performance in terms of lower CO and soot emission, but increased NO emission was observed due to improved combustion.
Highlights
In a compression ignition (CI) engine or diesel engine, the fuel under higher velocity is injected into the cylinder only towards the end of a compression stroke
By using computational fluid dynamics code, we have investigated the impact of spray cone angle on carbon monoxide (CO), NOx and soot discharge
The major conclusions are as follows: 1) Spray cone angle fuel injection showed the effects on mixture formation and, emission characteristics
Summary
In a compression ignition (CI) engine or diesel engine, the fuel under higher velocity is injected into the cylinder only towards the end of a compression stroke. Energy is derived from the ignition of the atomized fuel when contacted with this hot compressed air It is different from the spark ignition (SI) engine where premixed air and fuel are introduced into the cylinder, and the combustion process is ignited by a spark plug. Spray angle, fuel injection pressures, and variable fuel injection timing are the main input parameters in a diesel engine that translate to better diffusion atomization of fuels and in-cylinder air movements, affecting engine efficiency and emissions [1]. Due to better combustion efficiency, a small increase in the production of NOx was observed The AVL-FIRE code implemented for the study included modeling of the impact of fuel against the cylinder walls as well as heat transport upon film vapourization
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