Fuel Effects on Spatial Variation of AFR in an SI Engine

Paper #:
  • 972827

Published:
  • 1997-10-01
Citation:
Golombok, M., Cooney, P., Kitching, J., and Nattrass, S., "Fuel Effects on Spatial Variation of AFR in an SI Engine," SAE Technical Paper 972827, 1997, https://doi.org/10.4271/972827.
Pages:
14
Abstract:
A novel arrangement of four fibres was used to probe the fuel concentration at 4 different positions along the longitudinal axis of a transparent engine cylinder at 5 different times during the induction and compression strokes. By using a reference calibration experiment we derived variations in the air/fuel ratio at times in the engine cycle when the inlet and exhaust valves are closed. We used this technique to examine the effects of inlet-port swirl and injection timing for a number of fuels including 2 refinery streams. We also traced the different spatial distributions of spectrally resolved aromatic and paraffinic components from the same fuel during engine operation.
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