Numerical Investigation of a Potential of Dedicated EGR System for Increasing Thermal Efficiency of SI Engines Fueled with Methane and Propane

Paper #:
  • 2015-01-1883

Published:
  • 2015-09-01
DOI:
  • 10.4271/2015-01-1883
Citation:
Lee, S., Iida, N., and Sako, T., "Numerical Investigation of a Potential of Dedicated EGR System for Increasing Thermal Efficiency of SI Engines Fueled with Methane and Propane," SAE Technical Paper 2015-01-1883, 2015, doi:10.4271/2015-01-1883.
Pages:
11
Abstract:
This study tried to find a potential of dedicated EGR (d-EGR) system added to the four-cylinder spark ignition (SI) engine to decrease heat loss (Qheatloss) and improve thermal efficiency (ηth). Test fuels were chosen by methane and propane. PREMIX code in CHEMKIN-PRO was employed to calculate laminar burning velocity (SL) and flame temperature (Tf). Wiebe function and Wocshni's heat transfer coefficient were considered to calculate ηth. The results show that the d-EGR system increased ηth and it was higher than that of stoichiometric combustion of conventional SI engines due to the low Tf and fast SL.
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