Abstract
Due to serious air pollution problem caused by engine emissions such as carbonmonoxide CO, un-burnt Hydrocarbon HC, Oxides of Nitrogen NOx, and solid particulatematter C (Soot), and the increase of oil prices, steps must be taken to reduce pollution,and reduce fuel qualitative discharge, especially in combustion engines. To improve theefficiency and reduce the emissions of Diesel engines, some of the exhaust gases heatcould be recovered and utilized to improve the efficiency of the engines. In this paper, asimulation has been developed to study the effect of the turbocharger pressure and theinter-cooler temperature on the engine performance. FORTRAN language was appliedfor this study based on "Internal Combustion Engine Applied Thermodynamics" by C.R.FERGUSON. Results show that, the engine performance is significantly affected by theturbocharger pressure and the inter-cooler temperature, by increasing the Turbochargerpressure and decreasing the inter-cooler temperature the engine power output is stronglyimproved and the specific fuel consumption of the engine is reduced. By applying thepresent code to a medium four-stroke MAN Diesel and Turbo-engine, the thermalefficiency is raised to over 47% and the specific fuel consumptions can be as low as 126g/kWh at turbocharger pressure of 0.25 MPa and inter-cooler temperature of 325 K,compared to the results without turbocharger system where the thermal efficiency was44% and the specific fuel consumption was 132 g/kWh