Fully quantitative two-dimensional measurements of liquid- and vapor-phase fuel distributions (mass per unit volume) from high-pressure direct-injection gasoline injectors are reported for conditions of both slow and rapid vaporization in a heated, high-pressure spray chamber. The measurements employ the coevaporative gasoline-like fluorobenzene (FB)/ diethylmethylamine (DEMA)/hexane exciplex tracer/fuel System. In contrast to most previous laser-induced exciplex-fluorescence (LIEF) experiments, the quantitative results here include regions in which liquid and vapor fuel coexist (e.g. near the injector exit). A unique aspect is evaluation of both vapor- and liquid-phase distributions at varying temperature and pressure using only in situ vapor-phase fluorescence calibration measurements at room temperature and atmospheric pressure. This approach draws on recent extensive measurements of the temperature-dependent spectroscopic properties of the FB-DEMA exciplex system, in particular on knowledge of the quantum efficiencies of the vapor-phase and liquid-phase (exciplex) fluorescence. In addition to procedures necessary for quantitative measurements, we discuss corrections for liquid-vapor crosstalk (liquid fluorescence that overlaps the vapor-fluorescence bandpass), the unknown local temperature due to vaporization-induced cooling, and laser-sheet attenuation by scattering and absorption.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Quantitative liquid and vapor distribution measurements in evaporating fuel sprays using laser-induced exciplex fluorescence


    Additional title:

    Quantitative Messungen der Flüssigkeits- und Dampfverteilung im evaporierten Kraftstoffnebel mittels laserinduzierter Exciplex-Fluoreszenz



    Published in:

    Measurement Science and Technology ; 20 , 12 ; 125401/1-125401/13


    Publication date :

    2009


    Size :

    13 Seiten, 12 Bilder, 1 Tabelle, 38 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English





    Quantitative 2-D fuel vapor concentration measurements in an evaporating diesel spray using the exciplex fluorescence method

    Kim,T. / Ghandhi,J.B. / Univ.of Wisconsin-Madison,US | Automotive engineering | 2001



    On the quantitative application of exciplex fluorescence to engine sprays

    Felton,P.G. / Bracco,F.V. / Bardsley,M.E. et al. | Automotive engineering | 1993


    On the Quantitative Application of Exciplex Fluorescence to Engine Sprays

    Bracco, F. V. / Bardsley, M. E. A. / Felton, P. G. | SAE Technical Papers | 1993