Spatially Resolved Droplet Size Measurements

[+] Author and Article Information
T. A. Jackson, G. S. Samuelsen

UCI Combustion Laboratory, Department of Mechanical Engineering, University of California, Irvine, Calif. 92717

J. Eng. Gas Turbines Power 108(1), 196-203 (Jan 01, 1986) (8 pages) doi:10.1115/1.3239871 History: Received December 18, 1984; Online October 15, 2009


This paper encompasses initial tests of a droplet sizing technique, providing spatially and temporally resolved measurements within a liquid spray from an air assist nozzle. The method utilizes laser interferometry. The primary size measurement is based upon the signal visibility; it is validated by the peak intensity of the scattered light. As the system is based on the Doppler effect, a single component of velocity is extracted concurrent with the size information. The size of the measurement volume is controlled with off-axis light collection. Beam splitting is accomplished with a rotating diffraction grating, allowing the signal to be frequency shifted. Measurements are compared directly to those of a standard diffraction based sizing system (i.e., Malvern). The diffraction information is processed via Rosin-Rammler (2 parameter) and Model Independent (15 parameter) distribution algorithms. Correspondence between diffraction and interferometric results is satisfactory for the Model Independent algorithm. Differences observed using the Rosin-Rammler distribution are attributed to an inadequate representation of the spray by the two parameter model.

Copyright © 1986 by ASME
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