The Influence of Thermodynamic Parameters on Internal Combustion Engines and the Graphical Presentation of Cycles Diagrams Using Matlab

In this paper, a software package written in Matlab that allows setting up the engine thermodynamic parameters of internal combustion engine cycles has been developed. A Matlab-based graphical user interface is used to assist the lecturer in reducing the efforts in teaching applications for the variation of engine parameters; it is also a perfect tool for graphical presentation. Students can also benefit from the program code, where they can solve examples and compare the results they will get manually while solving their project. To derive the engine cycle data, the engineering model is used with simplifications such as: a constant specific heat is assumed for the air in the model; the piston-cylinder coupling is accepted as a closed system; every process is internally reversible, including the compression and expansion processes; and kinetic and potential energy effects are negligible. An application has been made by using the software to demonstrate the effect of thermodynamic parameters on internal combustion engines, such as engine work output, cycle thermal efficiency, Carnot efficiency, etc., and the graphical presentations of cycle diagrams.