Affiliations: Graduate Research Assistant, The Institute of Advanced
Aerospace Technology, School of Mechanical and Aerospace Engineering, Seoul
National University, San #56-1, Shinlim-dong, Gwanak-ku, Seoul 151-742,
Korea | Associate Professor, The Institute of Advanced
Aerospace Technology, School of Mechanical and Aerospace Engineering, Seoul
National University, San #56-1, Shinlim-dong, Gwanak-ku, Seoul 151-742, Korea.
E-mail: [email protected] | Associate Professor, Department of Mechanical
Engineering, Korea University of Technology and Education, PO Box 55, Chunan,
Chungnam 330-600, Korea
Abstract: The quantified fuel mass distribution of a spray was obtained from
laser induced fluorescence images with optical patternation. In the dense spray
region, however, the emitted fluorescence signal is significantly attenuated in
the path of the detector because of particle scattering. Thus, the fluorescence
image obtained with a camera may be different from the true fluorescence image
pattern. Therefore, we propose a method of finding the geometric mean of the
intensities obtained with two cameras and apply it to a solid-cone spray. We
also compared this optical patternation technique with other spray measurement
techniques, such as, PDPA (Phase Doppler Particle Analyzer) and the mechanical
patternator, to validate the accuracy of the proposed method. Results show that
the quantified mass distribution of the optical patternator agrees well with
those of the PDPA and the mechanical patternator. Hence, we can estimate the
local mass distribution rapidly without determining the entire structure of the
spray by using the geometric mean of the signals obtained from two cameras.
Keywords: Laser induced fluorescence (LIF), Imaging method, Spray, Mass distribution, Signal Attenuation
