Nonintrusive optical technique enables measurement of drops of water ingested through aircraft-engine nacelle. Drops photographed by light of laser beam directed across nacelle inlet. Beam shaped by beam expander and slit into sheet 9 mm thick. Exposure time only 10 ns- length of laser pulse, and drop motion therefore frozen in each of series of photographs. Fluorescent dye added to water improves edge definition of photographic images of drops; scattered laser light and its interference effects filtered out and only light at fluorescence wavelength photographed. Technique used in research on ingestion of water from heavy rain or wheel spray, but adapts to any droplet-laden gas stream.
Measuring Liquid Drops In Gas Flow
NASA Tech Briefs ; 12 , 9
1988-10-01
Miscellaneous
No indication
English
Measuring Shapes of Acoustically Levitated Drops
NTRS | 1987
|Surface tension driven-flow in non-coalescing liquid drops
Online Contents | 1996
|Aerodynamic shattering of liquid drops.
AIAA | 1969
|Aerodynamic shattering of liquid drops.
NTRS | 1968
|