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Droplet Sizing Research
Annual rept. 15 Jan 1983-15 Jan 1984
SPECTRON DEVELOPMENT LABS INC COSTA MESA CA
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The objective of this research program is to advance the understanding of droplet sizing technology in combustion environments using light scattering. Two techniques which offer great potential in the measurement of sprays are studied. The first, referred to as IMAX, consists of a nonintrusive pulse height analyzer. The second, referred to as visibilityintensity VI, performs a size measurement by examining the visibility and the pedestal intensity of a Doppler burst. Research conducted this past year indicated that the IMAX technique provided a larger dynamic range and higher accuracy than VI. It also showed that the two-color IMAX concept provided a higher SN primarily because of the high efficiency in spectrally separating the two signals. Results obtained with these techniques for two kinds of sprays are discussed. Excellent resolution and self-consistency was experienced with IMAX when measuring the same spray using three different size ranges. Both techniques showed excellent reolution when measuring biomodal and trimodal sprays. A probe volume algorithm was developed and tested, and it appears to be very promising in the measurement of mass flux and local number density. Keywords include Single particle counter, Doppler, Particle size velocity and Mass flux.
APPROVED FOR PUBLIC RELEASE