Toward Elimination of Soot Emissions from Jet Fuel Combustion
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Date
2023-07-18
Publication Type
Journal Article
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yes
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Abstract
Soot from jet fuel combustion in aircraft engines contributes to global warming through the formation of contrail cirrus clouds that make up to 56% of the total radiative forcing from aviation. Here, the elimination of such emissions is explored through N2 injection (containing 0−25 vol % O2) at the exhaust of enclosed spray combustion of jet fuel that nicely emulates aircraft soot emissions. It is shown that injecting N2 containing 5 vol % of O2 enhances the formation of polyaromatic hydrocarbons (PAHs) that adsorb on the surface of soot. This increases soot number density and volume fraction by 25 and 80%, respectively. However, further increasing the O2 concentration to 20 or 25 vol % enhances oxidation and nearly eliminates soot emissions from jet fuel spray combustion, reducing the soot number density and volume fraction by 87.3 or 95.4 and 98.3 or 99.6%, respectively. So, a judicious injection of air just after the aircraft engine exhaust can drastically reduce soot emissions and halve the radiative forcing due to aviation, as shown by soot mobility, X-ray diffraction, Raman spectroscopy, nitrogen adsorption, microscopy, and thermogravimetric analysis (for the organic to total carbon ratio) measurements.
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published
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Journal / series
Volume
57 (58)
Pages / Article No.
10276 - 10283
Publisher
American Chemical Society
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Edition / version
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Date collected
Date created
Subject
jet fuel combustion; soot; oxidation; morphology; nanostructure
Organisational unit
03510 - Pratsinis, Sotiris E. (emeritus) / Pratsinis, Sotiris E. (emeritus)
Notes
Funding
182668 - Tailor-made Carbonaceous Nanoparticles by Multiscale Combustion Design (SNF)
163243 - Multifunctional nanoparticles for targeted theranostics (SNF)
170729 - Integrated system for in operando characterization and development of portable breath analyzers (SNF)
163243 - Multifunctional nanoparticles for targeted theranostics (SNF)
170729 - Integrated system for in operando characterization and development of portable breath analyzers (SNF)