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  • 1
    Electronic Resource
    Electronic Resource
    Planar imaging of a laboratory flame and of internal combustion in an automobile engine using UV rayleigh and fluorescence light (1993)
    Springer
    Applied physics 56 (1993), S. 177-184 
    Details
    ISSN: 1432-0649
    Keywords: 82.40.Py ; 33.20.Fb ; 33.20.Lg ; 35.80.+s
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Rayleigh scattering of tunable excimer laser light (193 nm and 248 nm) is used to obtain 2-D images of the distribution of total densities in a laboratory flame and in a cylinder of an automobile engine. Because the UV light is very strongly scattered, there is ample signal and there is excellent contrast of Rayleigh light against surface scattered light, even in the small volume of the engine cylinder. The laboratory flame data are converted to an image of the temperature field. The Rayleigh images are compared with those from planar laser induced predissociative fluorescence, which yield state-specific densities of selected molecules. The experimental arrangement is the same except for the selection of laser wavelength and the filtering of the radiated light.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332197
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  • 2
    Electronic Resource
    Electronic Resource
    Multi-species detection in spray flames with tunable excimer lasers (1993)
    Springer
    Applied physics 56 (1993), S. 165-176 
    Details
    ISSN: 1432-0649
    Keywords: 33.20.Fb ; 35.80 ; 82.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Planar imaging with tunable excimer-laser sheet illumination is used to determine spatial distributions of different species in liquid-fuelled spray flames of commercial oil burning furnaces. Two burner configurations, which differ only in the fuel/air mixing devices, are investigated to understand why one configuration yields 30% less NOx emission. Iso-octane and n-heptane fuels are used. To understand the origin for NOx reduction spatial distributions of reactants (fuel, O2), the reaction intermediate OH and the pollutant NO are recorded. OH and O2 are measured by LIPF, NO by LIF. Fuel distributions are determined by another broad-band emission, whose origin is not yet identified. Both single shot and averaged distributions are recorded. The averaged distributions are extremely reproducible and depend sensitively on details of the burner geometry and the fuel/air mixing device. They can clearly be used to distinguish fine details in different injection systems. The spatial distribution of different species relative to each other yield considerable insight in the differences between the two combustion processes. On the basis of purely qualitative visualization it is possible to understand the origin for NOx reduction: it results from faster injection of air in the one fuel/air mixing device.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332196
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    Paper (German National Licenses)
    Fulltext
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