Combustion modeling with CFD in direct injection CI engine fuelled with biodiesel

The present paper describes the development of sub models for combustion analysis in direct injection (di) diesel engine fuelled with pongamia pinnata biodiesel-diesel blend as a fuel. in the present study,the computational fluid dynamics (cfd) code fluent was used to model a complex combustion phenomenon in compression ignition (ci) engine. the experiments were performed on a single cylinder direct injection diesel engine,with a full load condition at a constant speed of 1500 rpm. combustion parameters,such as cylinder pressure and heat release rate,were obtained from experimental data. the numerical modeling was solved by cfd code fluent,taking into account the effect of turbulence. for modeling turbulence renormalization group theory (rng) k-ε model was used. the sub models such as droplet collision model and taylor analogy breakup (tab) model were used for spray modeling. modeling in cylinder combustion,species transport and finite rate chemistry model were used. the results obtained from modeling were compared with experimental investigation. the peak modeling heat release rate was 30 j/s whereas the experimental peak heat release rate was 25 j/s at 364 degree ca for biodiesel. similarly,for the diesel peak modelling,the heat release rate was 34.41 j/s whereas the experimental peak heat release rate was 27 j/s at 364 degree ca. simulated results including the in-cylinder pressure,rate of pressure rise and heat release rate profiles have been analysed. a good agreement between the modelling and experimental data ensures the accuracy of the numerical predictions collected in this work. including peak values of in-cylinder pressure,rate of pressure rise and heat release rate shows a good agreement between modelling and the measured data. all in all,this study demonstrates the feasibility of integrating a compact multi-component surrogate fuel mechanism with cfd to elucidate the in-cylinder combustion of biodiesel fuels. © 2015 jordan journal of mechanical and industrial engineering.