Fluorescence Spectroscopy of Kerosene Vapour: Application to Gas Turbines

Progress to develop Planar Laser-induced Fluorescence on kerosene vapour is reported. Experiments were carried out in a heated test cell operating between 400 K and 700 K, at pressures between 0.1 MPa and 0.7 MPa. For a wavelength excitation of 266 nm, the fluorescence spectrum of kerosene vapour presents two separated fluorescence bands respectively in the 270-310 nm and in the 310-420 nm spectral regions which have different temperature, pressure and oxygen molar fraction dependence. Attribution of these spectral bands was achieved by comparison with reference spectra of several pure species which were analysed separately. Four species were identified, belonging to singlering aromatics and two-ring aromatics, as being primarily responsible for kerosene fluorescence. Temperature, pressure and mixture composition dependence of kerosene vapour absorption and fluorescence provides useful guidance for kerosene PLIF allowing quantitative imaging of local equivalence ratio and temperature. Illustrative results of visualisation of mixing layer between a jet and the surrounding air and measurement of local equivalence ratio are examined for a subsonic turbulent preheated kerosene/air jet exiting in air.

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