Abstract
Studies were made on the development of a digital imaging technique using double-pulsed laser-induced fluorescence (LIF) for detailed visualization and novel measurement of high-pressure diesel fuel spray. Rodamine B (C28H31CiN2) was chosen for fluorescent dye and dissolved in the diesel fuel, 0-solvent. The second harmonic of a double pulsed Nd: YAG laser (532 nm wavelength and 7 ns pulse width) was used as a light source for exciting fluorescent dye. The combined use of a high definition CCD camera and a specially-designed synchronization system has enabled well-resolved digital images of diesel fuel spray to be acquired with a thin laser sheet pulsed twice at an arbitrary time separation. This technique was shown to be capable of visualizing clearly not only overall spray structures but also deeply internal structures with spatial and temporal resolutions high enough for quantitative particle sizing and velocimetry in the core of the spray.
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