SEARCH · Engineering Papers
Results for “Soot”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
The effects of distillation characteristics and aromatic content on low-load gasoline compression ignition (GCI) performance and soot emissions in a multi-cylinder engine
Not Available
A Framework for Quantifying the Size and Fractal Dimension of Compacting Soot Particles
Not Available
Mechanical and Electrostatic Dispersion of a Polydisperse Cluster of Drops for Soot Control
A model is presented for the behavior of a polydisperse cluster of spherical evaporating drops in a cylindrical, axisymmetric inviscid vortex. The formulation accounts for drop interactions and for complete dynamic and thermodynamic coupling between drops and gas.
PGM-free metal oxide nanoarray forests for water-promoted low-temperature soot oxidation
Not Available
Facile fabrication of trepang-like CeO2@MnO2 nanocomposite with high catalytic activity for soot removal
Not Available
Experimental and numerical study of soot formation in hydrocarbon sprays under high-pressure fuel pyrolysis conditions
Not Available
On the use of oscillating jet flames in a coflow to develop soot models for practical applications
Not Available
Effects of maturity and temperature on soot density and specific heat
Not Available
Experimental and Kinetic modeling of soot formation in counterflow flames of surrogate fuel components: n-dodecane and iso-dodecane
Explore the source record for details and available documents.
The interaction between soot, thermal gradients, and dissipation rate in turbulent non-premixed jet flames
Not provided.
Sooting tendencies: Combustion science for designing sustainable fuels with improved properties
Not provided.
On the Mechanism of Soot Nucleation. IV. Molecular Growth of the Flattened E-Bridge
Not Available
The Identity and Chemistry of C 7 H 7 Radicals Observed during Soot Formation
Here we used aerosol mass spectrometry coupled with tunable synchrotron photoionization to measure radical and closed-shell species associated with particle formation in premixed flames and during pyrolysis of butane, ethylene, and methane. We analyzed photoionization (PI) spectra for the C 7 H 7 radical to identify the isomers present during particle formation. For the combustion and pyrolysis of all three fuels, the PI spectra can be fit reasonably well with contributions from four radical isomers: benzyl, tropyl, vinylcyclopentadienyl, and o-tolyl. Although there are significant experimental uncertainties in the isomeric speciation of C7H 7 , the results clearly demonstrate that the isomeric composition of C 7 H 7 strongly depends on the combustion or pyrolysis conditions and the fuel or precursors. Fits to the PI spectra using reference curves for these isomers suggest that all of these isomers may contribute to m/z 91 in butane and methane flames, but only benzyl and vinylcyclopentadienyl contribute to the C 7 H 7 isomer signal in the ethylene flame. Only tropyl and benzyl appear to play a role during pyrolytic particle formation from ethylene, and only tropyl, vinylcyclopentadienyl, and o-tolyl appear to participate during particle formation from butane pyrolysis. There also seems to be a contribution from an isomer with an ionization energy below 7.5 eV for the flames but not for the pyrolysis conditions. Kinetic models with updated and new reactions and rate coefficients for the C 7 H 7 reaction network predict benzyl, tropyl, vinylcyclopentadienyl, and o-tolyl to be the primary C 7 H 7 isomers and predict negligible contributions from other C 7 H 7 isomers. These updated models provide better agreement with the measurements than the original versions of the models but, nonetheless, underpredict the relative concentrations of tropyl, vinylcyclopentadienyl, and o-tolyl in both flames and pyrolysis and overpredict benzyl in pyrolysis. Our results suggest that there are additional important formation pathways for the vinylcyclopentadienyl, tropyl, and o-tolyl radicals and/or loss pathways for the benzyl radical that are currently unaccounted for in the present models.