Abstract
Numerical simulation studies were used to investigate the effects of piston geometries and intake swirl levels on the structure and evolution of the flow field at the top dead center (TDC) position of a simulated internal combustion engine (ICE). The piston shapes investigated were disc-shaped chamber, bowl-in-piston, and the re-entrant bowl geometries. The conditions considered are similar to those of production engines. The work focused on the near-wall and bowl entrance regions of the axisymmetric combustion chambers where strong swirl–squish interactions take place. The numerical calculations were performed with KIVA-II code. The \({k - \varepsilon}\) turbulence model was used in the present study. The results of this study show that high-shear regions and the consequent turbulence production occurred near the bowl entrance around the TDC of compression. Furthermore, this study shows that the re-entrant bowl piston configuration generated more turbulence quantities than both the disc-shaped and bowl-in-piston combustion chambers.
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