In-cylinder soot precursor growth in a low-temperature combustion diesel engine : laser-induced fluorescence of polycyclic aromatic hydrocarbons

C.A.J. Leermakers, M.P.B. Musculus

    Research output: Contribution to journalArticleAcademicpeer-review

    25 Citations (Scopus)
    120 Downloads (Pure)

    Abstract

    The growth of poly-cyclic aromatic hydrocarbon (PAH) soot precursors are observed using a two-laser technique combining laser-induced fluorescence (LIF) of PAH with laser-induced incandescence (LII) of soot in a diesel engine under low-temperature combustion (LTC) conditions. The broad mixture distributions and slowed chemical kinetics of LTC "stretch out" soot-formation processes in both space and time, thereby facilitating their study. Imaging PAH–LIF from pulsed-laser excitation at three discrete wavelengths (266, 532, and 633 nm) reveals the temporal growth of PAH molecules, while soot-LII from a 1064-nm pulsed laser indicates inception to soot. The distribution of PAH–LIF also grows spatially within the combustion chamber before soot-LII is first detected. The PAH–LIF signals have broad spectra, much like LII, but typically with spectral profile that is inconsistent with laser-heated soot. Quantitative natural-emission spectroscopy also shows a broad emission spectrum, presumably from PAH chemiluminescence, temporally coinciding with of the PAH–LIF.
    Original languageEnglish
    Pages (from-to)3079-3086
    Number of pages8
    JournalProceedings of the Combustion Institute
    Volume35
    Issue number3
    DOIs
    Publication statusPublished - 2015

    Fingerprint Dive into the research topics of 'In-cylinder soot precursor growth in a low-temperature combustion diesel engine : laser-induced fluorescence of polycyclic aromatic hydrocarbons'. Together they form a unique fingerprint.

  • Cite this