EGR and Injection Timing Variation Effects of an Engine Run in HCCI Mode Performance and Emitted Emissions

Miqdam T Chaichan, Khalil I Abaas
2015 International Journal of Engineering Trends and Technoloy  
Homogeneous charge compression ignition (HCCI) combustion can extend the operation of diesel engine to achieve better performance. HCCI can reduce NOx emissions by the low combustion temperatures resulted from the introduction of a fraction of EGR. Also, it can reduce PM by utilizing the premixed charge combustion. Direct injection multi-cylinder water cooled diesel engine used in this study. The tests procedure consisted of the addition of EGR starting from 0% till burning misfire occurred.
more » ... isfire occurred. Two cases were examined: first case, the injection of diesel fuel at advanced injection timing 35 degrees before top dead center (°BTDC). At the second case; the diesel fuel injected at retarded injecting timing of 12° BTDC. All these cases compared with operating the diesel engine with neat diesel and no EGR addition. The tests results illustrated that retarding injection timing led to a high increase in bsfc by about 17%. Also, it reduced brake thermal efficiency by about 20.88%. While operating the engine with advanced injection timing and 50% EGR resulted in reverse outcomes. Also, tested emissions HC, NOx, PM and engine noise were reduced remarkably compared with operating the engine with neat diesel and no EGR.
doi:10.14445/22315381/ijett-v19p221 fatcat:wkscaoiicva7vhocrjrb645pei