Instantaneous In-Cylinder Hydrocarbon Concentration Measurement during the Post-Flame Period in an SI Engine

Paper #:
  • 1999-01-3577

Published:
  • 1999-10-25
Citation:
Liu, H. and Wallace, J., "Instantaneous In-Cylinder Hydrocarbon Concentration Measurement during the Post-Flame Period in an SI Engine," SAE Technical Paper 1999-01-3577, 1999, https://doi.org/10.4271/1999-01-3577.
Pages:
11
Abstract:
Crevices in the combustion chamber are the main source of hydrocarbon (HC) emissions from spark ignition (SI) engines fuelled by natural gas (NG). Instantaneous in-cylinder and engine exhaust port HC concentrations were measured simultaneously using a Cambustion HFR400 fast response flame ionization detector (FRFID) concentrated on the post-flame period. The raw data was reconstructed to account for variation in the FFRID sample transit time and time constant due to fluctuating in-cylinder pressure. HC concentration development during the post-flame period is discussed. Comparison is made of the post-flame in-cylinder and exhaust port HC concentrations under different engine operating conditions, which gives a better understanding of the mechanism by which HC emissions form from crevices in SI engines.
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