Analysis of Pressure and Temperature Distribution for Diesel and B20 Biodiesel Inside The Combustion Chamber: A CFD Study
Simulations of computational fluid dynamics (CFD) have emerged as an effective design tool for studying engine reaction processes and designing next generation engines. Experimental studies require a great deal of cost, manpower, time and high-tech equipment. In this study, CFD analysis of in-cylinder is carried out using ANSYS FLUENT 19.2 software to the study flow characteristics inside the combustion chamber in Direct Injection (DI) CI engine and parameter such as in-cylinder pressure and temperature. The compression ignition (CI) engine gives more efficient than gasoline engine due to higher compression ratio. The fuel considered for this study are pure diesel and 20% blending of biodiesel derived from Palm oil with pure diesel. All the engine parameters and dimensions have been taken from the actual engine model-KM186 KIPOR diesel engine. In this study, only compression and power stroke cycle of CI diesel engine operation will be considered where the simulations start at the inlet valve close at 350 Crank Angle (CA) After Bottom Dead Centre (ABDC) with charge already fill the cylinder and ends at exhaust valves open at 350 CA Before Bottom Dead Centre (BBDC). The fuel was injected before the piston move near to Top Dead Centre (TDC) where the piston located at 230 CA Before Top Dead Centre (BTDC) with velocity of liquid 181m/s and the injection end at 80 CA BTDC. Results of simulations conducted have found that the maximum pressure and temperature for diesel was 52.23 bar and 1386 K while the peak pressure and temperature for B20 biodiesel was 55.1 bar and 1482K, respectively. Therefore, the pressure in cylinder of B20 slightly higher than diesel about 5.49%.