Todd D Fansler et al 2009 Meas. Sci. Technol. 20 125401 doi:10.1088/0957-0233/20/12/125401
Todd D Fansler1, Michael C Drake1, Boguslaw Gajdeczko2,3, Isabell Düwel4,5, Wieland Koban4,6, Frank P Zimmermann4,7 and Christof Schulz4
Show affiliationsFully 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.
64.70.Hz Solid-vapor transitions
82.60.Cx Enthalpies of combustion, reaction, and formation
78.55.Kz Solid organic materials
Soft matter, liquids and polymers
Condensed matter: electrical, magnetic and optical
Issue 12 (December 2009)
Received 19 May 2009, in final form 31 July 2009
Published 29 October 2009
Todd D Fansler et al 2009 Meas. Sci. Technol. 20 125401
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