Year: 2017 Volume: 1 Issue: 1 Page: 46-52
CFD ANALYSIS OF COMBUSTION IN A SINGLE CYLINDER CI ENGINE FOR DIESEL AND DUEL FUEL
OMPRAKASH HEBBAL, HOTTI S.R., SUNIL KUMAR R.
The Internal Combustion (IC) engines play a dominant role in the fields of transportation of goods, passengers, agricultural and industry. They develop power by consuming precious fossil fuels and cause pollution. Efforts have been put to improve exhaust emissions and fuel economy continuously. Gaseous fuels are attributed as clean, economical and abundant, which can improve the lean operating limits and decrease cyclic variations of an engine. Running the engine on gas is a prospect which is on offer for greener environment. In this present work an effort being made to evaluate combustion and emission characteristics by numerical method using CFD with experimental data’s available in the literature to optimize the emission characteristics. The work involves CFD analysis of combustion in CI engine for diesel and duel fuel. Combustion analysis is carried out in ANSYS14.5 Workbench using the non-premixed combustion model which describes the combustion process in terms of a single transport equation for a progress variable. For the turbulence, k-ε model is used. The combustion chamber used in this work comprises a flat cylinder head and the bowl in piston. Here two cases are compared, engine fueled with diesel and with duel fuel(Methane as primary fuel and diesel as pilot fuel). Combustion and emission characteristics are studied in a 30° sector of an engine cylinder. Contours of pressure, temperature, NOx are plotted. The pressure variations, temperature variations and mass fractions of species CO, CO2, and NOx with respect to crank angle are drawn for both the cases for one complete cycle is presented.
Anahtar Kelimeler (Keywords): CFD, Diesel engine, Duel fuel, Combustion, NOx emission, non-premix combustion model