Effects of a Combination with Supercharging and EGR on Biodiesel Combustion

- Combustion Improvement with 1-Butanol Blended Coconut Oil Methyl Ester -

Abstract

The present study investigated the effects of combining supercharging and EGR in the operation of a small single cylinder DI diesel engine. The experiments used coconut oil methyl ester (CME) and a blended fuel with 60% (mass) CME and 40% 1-butanol (represented as CMEB). The boost pressures were varied from 100 kPa (naturally aspirated condition) to 130 kPa with a Roots blower type supercharger and the oxygen concentration of the intake air were changed from 21 to 16.4% using cooled EGR. The results show that the trade-off relation between the NOx and smoke emissions of the CMEB fuel improved remarkably at high EGR conditions with supercharging.