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The Nature of Early Flame Development in a Lean-burn Stratified-charge Spark-ignition Engine by P.G. Aleiferis; A.M.K.P. Taylor; K. Ishii; Y. Urata is a Engineering article available to read on EtoBox.

What is The Nature of Early Flame Development in a Lean-burn Stratified-charge Spark-ignition Engine about?

The operating range of lean-burn SI engines is limited by the level of cycle-by-cycle variability in the early flame development, which typically corresponds to the 0-5% mass fraction burned. An experimental investigation was undertaken to study this flame variability in an optical, stratified-charge, SI engine close to the lean limit of stable operation (A/F = 22). Double-exposed flame images acquired through either a pentroof window ("tumble plane" of view) or the piston crown ("swirl plane" of view) were processed to calculate the intra-cycle flame growth and convection rates under 1500 RPM low-load conditions. Projected flame-boundary analysis was also performed to investigate the effect of flame shape/wrinkling on the subsequent timing of 5% mass fraction burned on a cycle-by-cycle basis. The images showed that the flame always preserved its shape while growing in size (even when it had been initiated with a highly convoluted shape); image processing demonstrated the manner with which the flame-growth speed varied as the flame propagated and approached the pentroof and piston-crown walls for slow, "typical" or fast burning cycles. It was found that it was beneficial to have a

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Author

P.G. Aleiferis; A.M.K.P. Taylor; K. Ishii; Y. Urata

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0010-2180)

Published

2004

Language

EN

Field

Engineering (Physical Sciences)