Journal Article
Geometric Effect of 3D Turbulent Field on Cyclic Variability
2011-04-12
2011-01-0824
Many studies, conducted by different researchers, have shown that in a carefully controlled engine almost all of the cyclic variability, observed in one cylinder, can be attributed to the flame kernel initiation and evolution. The authors have shown that variations in the flame kernel effective area can successfully explain a significant portion of observed cyclic variability. In the search of causes of this variation in effective area, the authors simulated the flame wrinkling in a 2D kinematically simulated turbulent field. That study had shown that flame wrinkling can explain between 5% - 53% of observed variability, depending on the operating conditions. This study explores the effect of adding the third dimension, which in turn allows the addition of flame stretch and curvature effects. Eight of the torque-speed operating points of the previous study are simulated using G-Equation and a 3D kinematically simulated turbulence.