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
Personal Author(s):
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.
Descriptors:
Subject Categories:
- Optics