In-Cylinder Flow Analysis of the Mercedes-Benz do Brasil Lean Burn CNG M366LAG Engine

Paper #:
  • 973114

Published:
  • 1997-12-31
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.
Pages:
14
Abstract:
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.
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