Oleic Methyl Ester Investigations in an Indirect Injection Diesel Engine; Stage One: Combustion Investigations

Renewable Energy Laboratory Development for Biofuels Advanced Combustion Studies

“…Technical grade Methyl Oleate with 78% purity was purchased from TCI America (Portland, OR). As previously stated, Methyl Oleate has been suggested in the past as a compound for enrichment in biodiesel fuels to improve biodiesel fuel properties [4]. As seen from previous studies, oleic acid is definitely a suitable fatty acid for enrichment in a fatty acid profile.…”

“…It was found in [4] that the optimum results are obtained with an average piston speed compared with instantaneous piston speed. …”

“…However, the higher viscosity range of biodiesel has some positive benefits, reducing barrel/plunger leakage and increasing injector efficiency. From the previous research [2][3][4], it was found that the viscosity of biodiesel is slightly higher than that of diesel, but of less magnitude than the original crude bio-oil used for production. For all the fuel mixtures in the viscosity studies, (0-100% peanut FAME), the viscosity was investigated at various temperatures to determine changes with respect to temperature and percentage of FAME in USLD#2.…”

“…It creates a permanent dipole moment that causes oxygenated molecules to exhibit stronger hydrogen bonding and increased molecular affinity compared to pure hydrocarbon molecules. These factors reduce the free space between molecules in biodiesel, decreasing its compressibility (high bulk modulus) relative to diesel fuel [4]. The injection timing modification has been investigated experimentally and the interest comes from its influence on ignition delay and combustion.…”

“…This type of engine has been investigated for Auxiliary Power Units applications for civil and miltary operation [3,4] due in part to the fact that it is more tolerant for use with alternative fuels, as a consequence of the fuel being introduced in a very hot high swirl chamber. This allows for lower injection pressure since the swirl chamber produces a very turbulent flow leading to fast evaporation and mixing.…”