Abstract
A single diesel spray of n- tridecane which was miscible with a small dopant was injected from a hole nozzle into a quiescent high-temperature and high-pressure atmosphere, and was impinged vertically on a flat surface with high temperature. It is possible to generate fluorescent emissions from the vapor and liquid phases in this evaporating spray, when a laser light sheet from an Nd: YAG laser is passing through the cross section of this spray. Then, clear 2-dimensional images for the vapor and liquid phases were obtained simultaneously, applying an exciplex fluorescence method. In particular, the vapor concentration was assessed quantitatively by applying Lambert-Beer's law to the measured fluorescence intensity in the vapor phase and by considering the quenching process of its fluorescent emission due to the mixture temperature. Further, we propose an original simulation model which describes the dispersion process of the impinging spray near the wall, considering the breakup phenomena of the impinging droplets and the heat transfer process using the KIVA simulation code.
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