SIX STROKE INTERNAL COMBUSTION ENGINE HEAT RECOVERY

Abstract

In thermal design of the internal combustion engines most researchers use airstandard power cycle models to perform their thermodynamic analyses. The concept adding two more strokes to the ideal Otto cycle to increase fuel power and efficiency is studied and presented here. It can be thought of as a four stroke Otto cycle followed by a two-stroke heat recovery steam cycle or also known as six stroke engine.

In this project, thermodynamic analysis was performed for a single cylinder six stroke gasoline internal combustion engine to identify the effect of added the amount of water injected for the second power stroke and to identify the cylinder pressure, a computer simulation by using Engineering Equation Solver (EES) was developed based on the Otto cycle which basically six stroke is the adding of two stroke into four stroke engine. Then, performance results can be obtained.

Wide range of engine thermal properties was computed, such as cylinder pressure and temperatures, density of air, entropy, enthalpy and specific volume of air in each cycle at all degrees of crank shaft from 0 to 1080 CA From the results, at constant engine speed (3000 RPM) due to one cycle the P-V and P-α diagrams were plotted and analysis. Thus, power , thermal efficiency improved by 3%, 30% respectively and decreased in fuel consumption about 29.5%.