This paper describes the results of computational studies on a single cylinder four stroke cycle spark ignition engine using Propane as an alternative fuel to petrol. The simulation is done in the professional engine simulation software from AVL Austria named as BOOST. The modeling methodology involves the use of first law of thermodynamics for engine as an open system when valves are open and engine as a closed system when valves are closed. To include the effect of gas exchange in the intake and exhaust manifolds when the valves are open, the modeling is done using Navier -Stokes equations for manifolds. The design parameters are fixed by engine geometry. A matrix was prepared for the operating variables to carry out the simulation. First the data was used as per petrol engine needs, and results for engine performance were generated. The operation was revised with data for proposed propane fuelled engine and its performance were studied. The software gave successful results in both the cases. It was observed that the power output was increased with propane as an alternative fuel due to its higher calorific value, there was reduction in brake specific fuel consumption due to higher calorific value of propane. The emissions will also reduced with propane as fuel because of less carbon atoms in propane as compared to petrol fuel. It is proposed that propane can be successfully used in petrol engine as an alternative fuel.
Engine, Petrol, Propane, Alternate fuels, Simulation, Performance, Emissions
