Evaluation of Peanut Fatty Acid Methyl Ester Sprays, Combustion, and Emissions, for Use in an Indirect Injection Diesel Engine
The paper provides an analysis of 100% peanut fatty acid methyl esters (FAMEs) and peanut FAME/ULSD#2 blends (P20, P35, and P50) in an indirect injection (IDI) diesel engine (for auxiliary power unit applications) in comparison to ultralow sulfur diesel no. 2 (ULSD#2) at various speeds and 100% load. From the fuel thermal and physical properties, it was determined that up to 50% peanut FAMEs blended with ULSD#2 (P50) would meet the ASTM D6751 fuel standard for viscosity. The ignition delay was in the range of 1 ms, and the apparent heat release presented similar values for all investigated fuels. The maximum cylinder instantaneous gas combustion temperature reached about 2100 K while the total heat flux was 1.95 MW/m2, and it was found that there was a 7% average increase in brake specific fuel consumption for P50 over ULSD#2. The mechanical efficiency for ULSD#2 and all of the tested FAMEs was around 77%, with 10% loss in overall engine efficiency for FAMEs compared with ULSD#2. Nitrogen oxide (NOx) emissions of the FAMEs, with an average value of 1.8 g/kWh and soot values with an average value of 0.15 g/kWh displayed very similar results with that of ULSD#2. Combustion analysis demonstrated the high tolerance of the IDI engine to various peanut FAME blends with results being similar to ULSD#2 and proved the suitability of this combination of fuel–engine for auxiliary power unit applications.
Soloiu, Valentin, Jabeous Weaver, Henry Ochieng, Brian Vlcek, Christopher Butts, Marcis Jansons.
"Evaluation of Peanut Fatty Acid Methyl Ester Sprays, Combustion, and Emissions, for Use in an Indirect Injection Diesel Engine."
Energy Fuels, 27 (5): 2608-2618.