On the i-s Diagrams of Combustion Gases of Acetylene-Air Mixture

Abstract

In this paper, we carried out both the calculations of the thermodynamic properties and the drawings of the i-s diagrams for combustion gases composed of acetylene-air mixture, because acetylene has a few interesting properties compared with liquid fuels which are generally used for a spark ignition engine. Further, we performed the comparison with isochoric and isobaric heats of combustion found from each i-s diagram of acetylene and octane, it is indicated therefrom that the heat of combustion has a considerable difference between combustion gases of acetylene-air mixture and those of octane-air mixture under the state of higher temperature, larger specific volume, and lower pressure. For the above reason, this work may be useful in the case of a cycle calculation where the accuracy is especially required. The diagrams cover the following ranges ; excess air factors : 0.8, 0.9, and 1.0, temperature : 600∼3000°K, pressure : 0.1∼200 ata, and specific volume : 0.04∼60m³/kg.