Numerical study of Injection Pressure and Timing Effects on a Diesel Engine Performance using Biodiesel Fuel

Subject Areas :

Received: 2012-11-05 Accepted : 2012-12-29 Published : 2013-03-20

Keywords: Diesel engine, Biodiesel fuel, KIVA3V code, Incylinder pressure,

Abstract :

      In this study, a numerical model was introduced for predicting combustion of a diesel engine with biodiesel fuel with different injection pressures and timings using KIVA3V code. RNG model has been used for modeling the turbulent flow in the cylinder. The CFD code was validated against experimental data. Comparison of the incylinder pressure of engine and the trend of incylinder pressure diagrams versus crankshaft angle with the experimental results showed good agreement between experimental and predicted results. The results of this research showed that for biodiesel fuel, the maximum of incylinder pressure of engine increased with the increasing of injection pressure and advancing of injection timing. Also, in such conditions the average temperature in the combustion chamber increases. Reducing the injection pressure and delaying the injection timing have an inverse result. Increasing the injection pressure improves the spray penetration into the combustion chamber.