Auflistung nach Autor:in "Wilson, Chris W."

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  • Kein Vorschaubild vorhanden
    Publikation
    Properties of jet engine combustion particles during the PartEmis experiment. Microphysics and Chemistry
    (Wiley, 15.07.2003) Petzold, Andreas; Stein, Claudia; Nyeki, Stephan; Gysel, Martin; Weingartner, Ernest; Baltensperger, Urs; Giebl, Heinrich; Hitzenberger, Regina; Döpelheuer, Andreas; Vrchoticky, Susi; Puxbaum, Hans; Johnson, M.; Hurley, Chris D.; Marsh, Richard; Wilson, Chris W.
    The particles emitted from an aircraft engine combustor were investigated in the European project PartEmis. Measured aerosol properties were mass and number concentration, size distribution, mixing state, thermal stability of internally mixed particles, hygroscopicity, and cloud condensation nuclei (CCN) activation potential. The combustor operation conditions corresponded to modern and older engine gas path temperatures at cruise altitude, with fuel sulphur contents (FSC) of 50, 410, and 1270 μg/g. Operation conditions and FSC showed only a weak influence on the microphysical aerosol properties, except for hygroscopic and CCN properties. Particles of size D ≥ 30 nm were almost entirely internally mixed. Particles of sizes D < 20 nm showed a considerable volume fraction of compounds that volatilise at 390 K (10–15%) and 573 K (4–10%), while respective fractions decreased to <5% for particles of size D ≥ 50 nm.
    01A - Beitrag in wissenschaftlicher Zeitschrift
  • Kein Vorschaubild vorhanden
    Publikation
    Properties of jet engine combustion particles during the PartEmis experiment. Particle size spectra (d > 15 nm) and volatility
    (Wiley, 18.09.2004) Nyeki, Staphan; Gysel, Martin; Weingartner, Ernest; Baltensperger, Urs; Hitzenberger, Regina; Petzold, Andreas; Wilson, Chris W.
    Size distributions (d > 15 nm) and volatile properties of combustion particles were measured during test-rig experiments on a jet engine, consisting of a combustor and three simulated turbine stages (HES). The combustor was operated to simulate legacy (inlet temperature 300°C) and contemporary (500°C) cruise conditions, using kerosene with three different fuel sulfur contents (FSC; 50, 400 and 1300 μg gˉ¹). Measurements found that contemporary cruise conditions resulted in lower number emission indices (EI N15) and higher geometric mean particle diameter (dG) than for legacy conditions. Increasing FSC resulted in an overall increase in EIN15 and decrease in dG. The HES stages or fuel additive (APA101) had little influence on EI N15 or dG, however, this is uncertain due to the measurement variability. EI N15 for non-volatile particles was largely independent of all examined conditions.
    01A - Beitrag in wissenschaftlicher Zeitschrift