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- W2329855254 startingPage "1850" @default.
- W2329855254 abstract "In order to investigate early soot formation process in diesel combustion, spectral analysis and optical thermometry of early soot formation region in a transient spray flame under diesel-like conditions (Pg=2.8 MPa, Tg=620-820 K) was attempted via laser-induced fluorescence (LIF) from pyrene (C16H10) doped in fuel. Pyrene is known to exhibit a temperature dependent variation of LIF spectrum, the ratio of S 2/S 1, fluorescence yields from the lowest excited singlet state S 1 and the second excited singlet state S 2, depends strongly on temperature. In the present study, pyrene was doped (1% wt) in a model diesel fuel (0-solvent) and the variation of LIF spectra from the pyrene in the spray flame in a rapid compression machine were examined at different ambient temperatures, oxygen concentrations, measurement positions and timings after start of fuel injection. Nd : YAG-pumped dye laser pulse at 309 nm (5 mJ) was used as the excitation source and the LIF spectra were measured by a spectrometer. The pyrene LIF spectra measured in non-combusting evaporating spray in nitrogen atmosphere showed increase in the S 2/S 1 ratio of LIF intensity and shift of the peak wavelength of S 1 band towards red with increasing ambient temperature. The pyrene LIF spectra measured in spray flame between start of injection and ignition showed increase in the S2/ S1 ratio of LIF intensity and shift of the peak wavelength of S 1 band towards red as the time progresses after start of injection, showing that the temperature variation of the gas mixture up to ignition can be captured by this technique. The LIF spectra measured in spray flame after ignition showed increase in emission intensity in longer wavelength region due to LIF from combustion products and the S 2/S 1 ratio of LIF intensity decreased. The pyrene LIF spectra measured in spray flame at 1.0 ms after start of injection at different ambient oxygen concentrations (5 to 21%) showed increase in the S 2/S 1 ratio of LIF intensity and shift of the peak wavelength of S 1 band towards red with increasing oxygen concentration, showing that the temperature difference of the gas mixture caused by progress of reaction at different oxygen concentrations can be captured by this technique." @default.
- W2329855254 created "2016-06-24" @default.
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- W2329855254 date "2006-01-01" @default.
- W2329855254 modified "2023-10-06" @default.
- W2329855254 title "Spectroscopic Analysis of Early Soot Formation Region in a Transient Spray Flame via Pyrene-LIF Technique" @default.
- W2329855254 doi "https://doi.org/10.1299/kikaib.72.1850" @default.
- W2329855254 hasPublicationYear "2006" @default.
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