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  • Electronic Resource  (2)
  • 07.60  (1)
  • PACS: 47.27.-i; 42.62.-b  (1)
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  • Electronic Resource  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 71 (2000), S. 711-716 
    ISSN: 1432-0649
    Keywords: PACS: 47.27.-i; 42.62.-b
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. High-speed planar laser-induced fluorescence (PLIF) and 3-D large eddy simulations (LES) are used to study turbulent flame kernel growth, wrinkling and the formation of separated flame pockets in methane/air mixtures. Turbulence was effected by a set of rotary fans situated in a cylindrical enclosure. Flame wrinkling was followed on sequential 2-D OH images captured at kHz repetition rates. Under stoichiometric conditions and low turbulence levels the flame kernel remains singly connected and close to spherical in shape. By increasing turbulence or reducing the stoichiometry of the mixture the formation of separated pockets could be observed and studied. The mechanisms behind these phenomena are investigated qualitatively by LES of a level-set G-equation describing the flame surface propagation in turbulent flows.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0649
    Keywords: 07.60 ; 42.30 ; 82.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract One dimensional imaging of fluorescence lifetimes was performed directly for the first time in a premixed, atmospheric-pressure ethylene/air flame. A picosecond laser system based on the microscope-DFDL (Distributed-Feedback Dye Laser) was used for excitation of OH. The method involves imaging a section of the flame onto the streak camera and evaluating a series of windows, each with a certain number of channels of the CCD-multichannel plate. In this way, changes in quenching efficiency can be monitored along a horizontal line through the flame. These direct lifetime measurements confirm the observations of relative lifetimes previously obtained for this flame by saturated 2D-LIF.
    Type of Medium: Electronic Resource
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