(532cv) Black Carbon across Decadal Length Scales: Biofuel Content Dependence
AIChE Annual Meeting
Wednesday, November 16, 2022 - 3:30pm to 5:00pm
The HRTEM images are analyzed to study the variation of aggregate size, morphology, and nanostructures with engine thrust and fuel composition. Aggregate size increases with power, the dependence is lower for fuel blends with higher biofuel content and for any given power, aggregate size decreases with increasing biofuel (paraffinic) content. Primary particle and aggregate sizes correlate for all fuels. HRTEM results also show that the fringe tortuosity increases with increasing biofuel content. The common thread rationalizing these observations is the competition between particle nucleation and growth as governed by fuel-carried aromatics and turbulence-induced mixing which acts to decrease local . In summary, aggregate morphology, primary particle size, and nanostructure are dependent upon biofuel blend levels, mediated by the combustion dynamics, with the foremost effect being upon particle inception. At present these findings highlight important considerations of using biofuel over the conventional fuel in aircraft to minimize the emission of soot benefitting human health and the environment.