Engine Injector Multiphase Flow with Indicated Quantities Simulation for Different Orifice Geometries and Needle Movements

In the present paper, the effect of using Different Orifice Geometries & Needle Lifts on transient heat-mass transfer and Combustion Indicated Quantities & Air Pollutant Species has been investigated in Marine Propulsion System Fuel Injectors using AVL-Fire CFD code. The effect of each of the proposed geometry and needle movement profiles (triangular, trapezius & boot) with the help of a three-dimensional moving mesh by numerical model in AVL Fire software, which has been validated with experimental data in each part, on the performance & Air Pollutant Species of the Marine Propulsion System has been investigated by ANALYSER module. Numerical results show that converged conical with trapezius needle lift profile has better engine performance, efficiencies and lower NO pollution. Although, diverged conical with trapezius needle lift profile has lower CO pollution. Fuel consumption decreases by 18.5% and its power and torque increase 64%. Also in this case, carbon monoxide pollutants decrease by 14% and nitrogen oxide pollutants decreasing by 10% for optimum status. In these case, indicated and mechanical efficiencies are increasing 22% and 41.5%, respectively.