| dc.description.abstract | The effect of piston bowl geometry on reducing soot emissions, improving combustion, and in-cylinder flow movements
in a direct injection diesel engine was investigated. Standard combustion chamber (SCC) and newly modified combustion
chamber (MCC) geometries were compared at the same compression ratio (17.5:1). Experimental analysis of diesel
engines is expensive and time consuming, and therefore the Computational Fluid Dynamics program was used to analyze
the combustion, flow and emission process. AVL Fire ESE Diesel software was used in the numerical study. The numerical
work was compared with the experimental results, and it was validated. In addition, 10% biodiesel mixture (10% Sal
seed oil methyl ester + 90% diesel fuel) and diesel fuel were used in the analysis. These fuels and two different bowl
geometries were investigated at 2000 rpm and full load conditions. Thus, the effect of the used biodiesel fuel and the
developed bowl geometry were investigated. Sal seed oil methyl ester was used as biodiesel fuel. The results show that
higher turbulence velocity distribution, better mixture fraction values and lower soot formation distribution are
obtained by directing the MCC type fuel according to SCC type. When the pressure, temperature and heat release in
the combustion chamber are examined, the highest values were obtained with B10 blended fuel used at the SCC type
combustion chamber. The maximum heat release rates are 8.72, 9.38, 8.21, and 9.30 J/ for SCCD100, SCCB10,
MCCD100 and MCCB10 fuels, respectively. | tr |
