The Effect of Swirl on Spark-Ignition Engine Combustion (2nd Report, Burning Velocity of a Turbulent Flame in a Cylinder)

It is necessary to estimate the turbulent burning velocity in the cylinder of a spark-ignition engine, in order to refine the entrainment model which is often used for modeling engine combustion. Nevertheless, the effect of turbulence characteristics on the burning velocity has scarcely been studied in a spark-ignition engine. We have investigated those in constant volume vessels of disc and cubic types. In this study, the turbulent burning velocity, Sr, and the thickness of the burning zone, or, were determined in a spark-ignition engine cylinder. As a result, it was made clear that Sr and δr increased with increasing turbulence intensity, and that δr was correlated linearly with Sr except under the condition of weak turbulence.