Computational effect of speed and air-fuel ratio on performance of a turbocharged four cylinder four stroke cycle direct injection diesel engine using hydrogen and diesel as alternative fuels

This paper describes the results of computational studies on a turbocharged four cylinder four stroke cycle direct injection diesel engine using Hydrogen as an alternative fuel to diesel. The simulation is done in the professional engine simulation software from AVL company of Austria named as BOOST. The modeling methodology involves the use of first law of thermodynamics and Navier-Stokes equations for engine cylinder and 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 diesel engine needs and results for engine performance were generated. The operation was revised with data for proposed hydrogen engine and its performance was studied. The software gave successful results in both the cases. It was observed that the power output and brake specific fuel consumption were improved with hydrogen as an alternative fuel due to its higher calorific value. It is proposed that hydrogen can be successfully used in diesel engine using pilot injection of diesel towards the end of the compression stroke or else by using a spark plug in diesel engine. It is proposed that only air will travel through compressor and intake manifold and liquefied hydrogen will be injected as per norms in multi point fuel injection systems using intake port for injection.