Accession Number:

ADA409371

Title:

Phase Doppler Interferometry with Probe-to-Droplet Size Ratios Less Than Unity. Part I: Trajectory Errors

Descriptive Note:

Technical paper

Corporate Author:

AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE WEST

Report Date:

1999-08-16

Pagination or Media Count:

20.0

Abstract:

Phase Doppler interferomety utilizing a probe volume much smaller than the droplets being measured has been shown to work well when coupled with a phase ratio and intensity validation scheme which is capable of eliminating trajectory dependent scattering errors. Ray-tracing and geometric optics models were used to quantitatively demonstrate the type and magnitude of trajectory errors through stochastic trajectory calculations. Measurements with mono-dispersed water droplet streams and glass beads have been performed to validate the model calculations. Measurements with mono-dispersed water droplet streams and glass beads have been performed to validate the model calculations and to characterize the probe volume. Scattered light intensity has also been shown to provide a robust means of determining the probe cross-sectional area which is critical for making accurate mass flux measurements.

Subject Categories:

  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE