A Study for High Efficiency of Diesel Engine in the High Load Operation（Second Report）

-Investigation of Effects of Fuel Property on the Wall Heat Loss with Rapid and Expansion Machine-

Abstract

In this research, we investigate the heat transfer mechanism with visualized Rapid Compression and Expansion Machine. Therefore, we measured the heat flux in the diesel combustion field with coaxial type thermocouple. In this report, we aimed to investigate effects on changing of fuel property on the heat loss by wall heat transfer with dual component fuel (Pentane and Decane). Dual component fuel (P_inj = 180 MPa) is compared to diesel oil (P_inj = 180 MPa) ,the cooling loss decreased by 13.1% by activation of combustion in the cavity at the late combustion period (at 1.0 to 2.0 deg.ATDC) and realization of low penetrating power spray flame.