要約

Spray and mixture formation processes are known to play a pivotal role in determining combustion and emissions in diesel engines. The purpose of this study is to numerically investigate the effects of various spray breakup and turbulent dispersion models on fuel spray characteristics as well as on in-cylinder pressure in Caterpillar heavy duty diesel engines by using the computational fluid dynamics (CFD) simulation. The domain considers only one-sixth of the combustion chamber because the chamber geometry is symmetric and a six-hole injector is used. Furthermore, the simulation is performed from intake valve closing (IVC) to exhaust valve opening (EVO) when the engine works at steady conditions. In the present study, these models are numerically investigated and compared and some possible reasons for the differences between their related results are discussed. The simulation results show the significant influence of different spray breakup and turbulent dispersion models on fuel spray penetration. Experimental data have been used to validate the numerical results.