The Effects of Biodiesel on Performance and Exhaust Emissions of a Low Heat Rejection Diesel Engine

Abstract

The object of this study was to observe the combined effects of biodiesel and a low heat rejection combustion technique. To investigate the effect of biodiesel usage in a low heat rejection diesel engine, a direct injected, turbocharged diesel engine's cylinder head, valves, and pistons were coated with 0.15 mm of nickel-chrome-aluminum bond coat and 0.35 mm of yttria-stabilized zirconia. According to the engine tests, it was determined that brake specific fuel consumption was increased with biodiesel usage and low heat rejection application but decreased for low heat rejection diesel at low speed. Exhaust gas temperature, excess air ratio, and smoke absorption coefficient were decreased with biodiesel usage but increased with low heat rejection application. NO_x emission was increased at low speed but decreased at high speed with biodiesel usage and it was increased with low heat rejection application.

Keywords:

• alternative fuels
• biodiesel
• exhaust emission
• low heat rejection engine

Notes

^aAverage of guaranteed values by TUPRAS.

^bMinimum guaranteed value by TUPRAS.

^cMaximum guaranteed value by TUPRAS (Turkish Petroleum Refineries Corporation).