The objective of this work is to simulate spray flow with different break-up models and investigate the effect of these models on DI diesel engine combustion and performance. In this simulation, the 3-Dimensional Naiver-Stokes equation is solved with SIMPLEC algorithm. All the simulations were carried out by the use of FIRE CFD tool. Results were validated with available experimental data for OM_355 DI diesel engine for mean cylinder pressure. There have been good agreements between experiments and the CFD calculations.

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