Analysis of Improved In-Cylinder Combustion Characteristics with Chamber Modifications of the Diesel Engine

This study numerically analyses the effects of chamber modifications to investigate improvement in-cylinder combustion characteristics diesel engine using a computational fluid dynamics (CFD) approach. Five different modified chambers, namely, double swirl (DSCC), bathtub (BTCC), toroidal re-entrant (DTRCC), shallow depth (SCC), and stepped bowl (SBCC) were developed compared with reference flat (FCC). The on temperature formation, velocity distribution, injection profiles, turbulent motions (swirl tumble ratio) investigated. During compression stroke, near top dead centre, SCC showed peak 970 K, followed by FCC (968 K), SBCC (967 DTRCC (748 K 815 K). DSCC high ratio above 0.6, whereas BTCC approximately 0.4. found that SCC, BTCC, have better rates than in terms temperature, heat release rate, distribution. However, poor formation rapid (approx. 150 J/°CA), which can lead knocking tendencies. In conclusion, other chambers. addition, inside chambers avoided crevice regions. recommends avoiding wider bowls order prevent uneven across cylinder. Furthermore, split such as DSCC, along adjusted rates, provide results combustion.