Pulsed laser heating of diesel engine and turbojet combustor soot: Changes in nanostructure and implications

Vander Wal, Randy L.; Singh, Madhu; Bachalo, William; Payne, Greg; Manin, Julien Luc; Howard, Robert

doi:10.1080/02786826.2023.2244548

Pulsed laser heating of diesel engine and turbojet combustor soot: Changes in nanostructure and implications

Journal Article · Tue Aug 22 00:00:00 EDT 2023 · Aerosol Science and Technology

DOI:https://doi.org/10.1080/02786826.2023.2244548· OSTI ID:2311344

^[1]; Singh, Madhu ^[1]; Bachalo, William ^[2]; Payne, Greg ^[2]; Manin, Julien Luc ^[3]; Howard, Robert ^[4]

Pennsylvania State Univ., University Park, PA (United States). Earth and Environmental Systems Inst. (EESI)
Artium Technologies Inc., Sunnyvale, CA (United States)
Artium Technologies Inc., Sunnyvale, CA (United States); Sandia National Lab. (SNL-CA), Livermore, CA (United States)
US Air Force, Arnold Engineering Development Complex (AEDC), Arnold AFB, TN (United States)

Here, carbonaceous particulate produced by a diesel engine and turbojet engine combustor are analyzed by transmission electron microscopy (TEM) for differences in nanostructure before and after pulsed laser annealing. Soot is examined between low/high diesel engine torque and low/high turbojet engine thrust. Small differences in nascent nanostructure are magnified by the action of high-temperature annealing induced by pulsed laser heating. Lamellae length distributions show occurrence of graphitization while tortuosity analyses reveal lamellae straightening. Differences in internal particle structure (hollow shells versus internal graphitic ribbons) are interpreted as due to higher internal sp3 and O-atom content under the higher power conditions with hypothesized greater turbulence and resulting partial premixing. TEM in concert with fringe analyses reveal that a similar degree of annealing occurs in the primary particles in soot from both diesel engine and turbojet engine combustors—despite the aggregate and primary size differences between these sources. Implications of these results for source identification of the combustion particulate and for laser-induced incandescence (LII) measurements of concentration are discussed with inter-instrument comparison of soot mass from both diesel and turbojet soot sources.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-CA), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USEPA

Grant/Contract Number:: NA0003525

OSTI ID:: 2311344

Report Number(s):: SAND--2024-01534J

Journal Information:: Aerosol Science and Technology, Journal Name: Aerosol Science and Technology Journal Issue: 10 Vol. 57; ISSN 0278-6826

Publisher:: Taylor & FrancisCopyright Statement

Country of Publication:: United States

Language:: English

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