Theoretical Study Of Some Combustion Parameters On Performance Of Internal Combustion Engines.

Abstract

A study of gas cycles as the models of internal combustion engines is useful for illustrating some of the important parameters influencing engine performance. In this paper the effect of combustion efficiency, specific heat ratio, and equivalence ratio on the variation on performance with compression ratio for Otto engine. By using Excel program the characteristic curves of the power output and thermal efficiency versus compression ratio are obtained. The results show that the power output, the thermal efficiency, the optimal compression ratio corresponding to maximum power output point, the optimal compression ratio corresponding to maximum thermal efficiency point. The performance characteristic curves of the cycle are presented. Moreover, the effect of combustion efficiency, specific heat ratio, and equivalence ratio on the cycle performance were analyzed. The results show that the effect of combustion efficiency, specific heat ratio, and equivalence ratio on the cycle performance are significant. The results of this investigation are of importance when considering the designs of actual Otto engines.