Atomization and Sprays Journal of the International Institutes for Liquid Atomization and Spray Systems

ISSN for PRINT: 1045-5110

For Online Access

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1995, Volume5

Issue 6

121 pages

Issue price - $75.00

J. Y. Zhu
Aerometrics, Inc., Sunnyvale, California, USA

E. J. Bachalo
Aerometrics, Inc., Sunnyvale, California, USA

R. C. Rudoff
Aerometrics, Inc., Sunnyvale, California, USA

W. D. Bachalo
Artium Technologies, Inc., Los Altos Hills, California, USA

Vincent G. McDonell
Department of Mechanical and Aerospace Engineering, University of California, Irvine, California, USA

Comparisons are performed between a frequency-domain processor, the Doppler signal analyzer (DSA), and a counter processor (PDPA) for phase Doppler particle size and two-component velocity measurements in a well-characterized simplex spray with and without the presence of swirl. To minimize issues associated with repeatability, symmetry, and uncertainty in measurement location, an experiment that allowed simultaneous measurements by two independent instruments with overlapping sample volumes was conducted. It was observed that the use of the frequency domain for both burst detection as well as signal processing resulted in a reduced sensitivity to detector gain for the DSA compared to the PDPA. In the particular sprays considered, consistent agreement between droplet size and droplet velocity measured by each instrument was observed. Indirect measurements (e.g., volume flux, number density) were also compared and, although good agreement was observed for the simplex spray, several issues associated with the swirling case prevented satisfactory comparison. The results demonstrate the utility of such comparative studies and also illustrate the difficulty in establishing performance in general in actual polydispersed sprays.

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