EQUIVALENCE RATIO MEASUREMENTS IN KEROSENE-FUELLED LPP INJECTORS USING KEROSENE PLANAR LASER-INDUCED FLUORESCENCE

摘要

Experiments to develop Planar Laser-induced Fluorescence (PLIF) on kerosene vapour were carried out in a test cell operating between 400 K and 700 K at pressures between 0.1 MPa and 0.7 MPa for 266 nm laser excitation. The fluorescence spectrum of kerosene vapour presents two spectrally separated fluorescence bands arising from naturally present single and two-ring aromatics. Fluorescence from these aromatics show different temperature, pressure and oxygen molar fraction dependence. This yields an opportunity to develop a quantitative PLIF-kerosene technique. This technique was applied for the first time to a real LPP injector operating at atmospheric pressure with jet A1 fuel, for air temperature of 650 K and overall equivalence of 0.44. Instantaneous images of kerosene fluorescence were recorded for evaporating conditions (i.e. no combustion, only fuel vaporisation) with two ICCD cameras equipped with appropriate optical filters. Fluorescence images were processed exploiting the fluorescence dependencies found by test cell experiments. Maps of local equivalence ratio could be obtained.