In-Cylinder Flow Analysis of the Mercedes-Benz do Brasil Lean Burn CNG M366LAG Engine 973114
A computational fluid dynamics (CFD) analysis of the M366LAG in-cylinder flow was performed to explain what are the reasons for the measured engine slower combustion which results from the replacement of the intake valve seat angle of 45° by 20°.
Simulations showed that a quite different in-cylinder flow resulted from the different designs. The 20° geometry was found to generate a weaker turbulent field at the end of the compression stroke, specially around spark plug, which was identified as the cause of the slower combustion. The weaker turbulence is a result of a less coherent flow structure which is less capable of both storing the main flow kinetic energy until the compression stroke end and of taking advantage of squish to generate turbulence.
Citation: Langeani, M., Borges, L., Hollnagel, C., Muraro, W. et al., "In-Cylinder Flow Analysis of the Mercedes-Benz do Brasil Lean Burn CNG M366LAG Engine," SAE Technical Paper 973114, 1997, https://doi.org/10.4271/973114. Download Citation
Marcos Langeani, Luiz H. Borges, Carlos Hollnagel, Wilson Muraro, Ricardo Fontes
SAE Brasil 97 VI International Mobility Technology Conference and Exhibit