Performance Comparison Of Two Interferometric Droplet Sizing Techniques

T. A. Jackson; G. S. Samuelsen

doi:10.1117/12.978038

Abstract

Spatially resolved measurements of droplet size and velocity are desirable to aid in matching fuel injectors to combustor flow fields and to support the development of two phase flow modeling. Interferometric, laser based techniques have been available since the early '70s. Successful application to practical sprays, however, has been hampered by numerous difficulties. In this paper, two interferometric techniques (Visibility/Intensity Validation and Phase Doppler) are critically examined in characterizing the spray of an air-assist nozzle with Sauter mean diameter.c35 microns. The two techniques are compared to each other and are evaluated against a Malvern diffraction unit. With the use of a rotating grating for Visibility/Intensity Validation, the interference techniques compare well to each other and to the diffraction method. The Phase Doppler technique is more easily applied to the spray, due largely to its broadened size and velocity ranges. The consistency of the interferometric results raises questions with regard to the use of the Malvern's most frequently applied distribution model.

Citation Download Citation

T. A. Jackson, T. A. Jackson, G. S. Samuelsen, G. S. Samuelsen, } "Performance Comparison Of Two Interferometric Droplet Sizing Techniques", Proc. SPIE 0573, Particle Sizing and Spray Analysis, (11 November 1985); doi: 10.1117/12.978038; https://doi.org/10.1117/12.978038

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