Abstract
Diesel engines are widely used. However, they have issues of large emissions of nitrogen oxide and soot and high combustion noise. In order to improve understanding of the relationship between combustion noise and exhaust emission under various combustion conditions, this study investigates the effects of combustion impact on radiated combustion noise and exhaust emission characteristics for a single-cylinder diesel engine with a supercharger and EGR system by changing the fuel injection conditions, intake air pressure and oxygen concentration in the intake air. The results show that the engine noise greatly depends on the maximum combustion impact energy at 2500 Hz. As the maximum combustion impact energy is increased, NOx emission roughly increases, smoke emission roughly decreases, and CO emission roughly stays constant. However, there are some operating parameters which show different dependencies.
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