The computational investigations carried out on a single cylinder four stroke cycle petrol engine with hydrogen as an alternative fuel are presented in this paper. The results have been simulated in the professional internal combustion engine simulation software from AVL Austria named as BOOST. The modeling of the entire engine system is done by selecting and joining the elements available in the software. For calculating various thermodynamic properties the first law of thermodynamics is applied to the 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 mapping of the input and output characteristics of the baseline engine was done by using conventional petrol as fuel. The operation was revised with data for proposed hydrogen engine and its performance and emissions characteristics were studied. The software gave successful results in both the cases. In comparison with the conventional petrol fuel it was observed that the power output of the engine was decreased with hydrogen. However the brake specific fuel consumption was lower with hydrogen fuel. The CO and HC emissions were reduced with hydrogen while as there was increase in NOx emissions. It is proposed that hydrogen can be successfully used in petrol engine as an alternative future fuel.
Engine, Petrol, Hydrogen, Alternate fuels, Simulation, Performance, Emissions
