ISSN Online: 2379-1748
7th Thermal and Fluids Engineering Conference (TFEC)
SJR: 0.152 SNIP: 0.14 CiteScore™:: 0.5
INVESTIGATION OF ORGANOMETALLIC ADDITIVES FOR SOOT MITIGATION THROUGH DROPLET COMBUSTION EXPERIMENTS
Despite their high energy densities, the propensity of cage hydrocarbon fuels to form soot is a significant barrier to their implementation in propulsive applications. One of the most cost-effective ways of addressing the problem of soot formation in practical combustion devices is through the use of additives. The present study investigates the efficacy of the organometallic additives − ferrocene and methylcyclopentadienyl manganese tricarbonyl (MMT) for soot oxidation in an isolated droplet combustion environment. Dicyclopentadiene (DCPD), the compound used as the starting material for synthesizing the bishomocubane (BHC) family of cage hydrocarbon fuels, was used as the base fuel for investigation since the BHC fuels themselves were expensive to synthesize. In addition to pure DCPD, blends of DCPD with ferrocene and MMT additives having approximately 500, 1000, and 1500 ppm of metal by weight in DCPD were also tested. Experiments were performed in ambient air and environments containing 50% O2 and 80% O2, with balance nitrogen. Temperature and relative soot volume fraction contours of combusting droplets were obtained through the color-ratio pyrometry technique using a calibrated DSLR camera. Both ferrocene and MMT were found to be effective in oxidizing the soot deposits left on the quartz rod, showing slightly improved performance in environments with higher oxygen concentrations. However, for the experimental configuration investigated in this work, in-situ oxidation of soot by ferrocene and MMT additives was found to be minimal, which was attributed to the lower boiling point of DCPD compared to the additives.