SYMPOSIA PAPER Published: 01 January 1986

Laser Droplet Interferometry Approach to Spray Drop Size Analysis


With the advent of modeling computer programs which can handle in a timely fashion the elliptical Navier-Stokes equations and the growing demand for more knowledge about the design of injectors, a need has arisen for detailed or point measurements of the air velocity and droplet size and velocity downstream of injectors. The air velocity can be readily measured by seeding the airflow and using a standard nonintrusive laser doppler velocimetry (LDV) system. The laser droplet interferometry approach is a promising technique that is nonintrusive and has the potential of simultaneously measuring the droplet size and velocity from a single point measurement. Two laser droplet interferometry techniques are currently being developed. One of these techniques is the Imax system being developed at Spectron Development Laboratory, Inc., by Dr. Cecil Hess; the other system is the Phase-Doppler technique being developed at Aerometrics, Inc., by Dr. Will Bachalo. The principles behind these systems and some typical data are presented in this paper.

Author Information

Kennedy, JB
Aero-thermal Technology, United Technologies Research Center, East Hartford, CT
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Developed by Committee: E35
Pages: 114–127
DOI: 10.1520/STP18365S
ISBN-EB: 978-0-8031-4980-9
ISBN-13: 978-0-8031-0481-5