Comparison of Unl Laser Imaging and Sizing System and a Phase Doppler System for Analyzing Sprays from a NASA Nozzle

By National Aeronautics and Space Administration

Research was conducted on characteristics of aerosol sprays using a P/DPA and a laser imaging/video processing system on a NASA MOD-1 air assist nozzle being evaluated for use in aircraft icing research. Benchmark tests were performed on monodispersed particles and on the NASA MOD-1 nozzle under identical lab operating conditions. The laser imaging/video processing system and the P/DPA showed agreement on a calibration tests in monodispersed aerosol sprays of + or - 2.6 micron with a standard deviation of + or - 2.6 micron. Benchmark tests were performed on the NASA MOD-1 nozzle on the centerline and radially at 0.5 inch increments to the outer edge of the spray plume at a distance 2 ft downstream from the exit nozzle. Comparative results at two operation conditions of the nozzle are presented for the two instruments. For the 1st case studied, the deviation in arithmetic mean diameters determined by the two instruments was in a range of 0.1 to 2.8 micron, and the deviation in Sauter mean diameters varied from 0 to 2.2 micron. Severe operating conditions in the 2nd case resulted in the arithmetic mean diameter deviating from 1.4 to 7.1 micron and the deviation in the Sauter mean diameters ranging from 0.4 to 6.7 micron. Alexander, Dennis R. Unspecified Center AEROSOLS; DROP SIZE; IMAGING TECHNIQUES; LASER ANEMOMETERS; LASER DOPPLER VELOCIMETERS; NOZZLE GEOMETRY; SPRAY CHARACTERISTICS; AIRCRAFT HAZARDS; CALIBRATING; ICE FORMATION; STANDARD DEVIATION...

• Format: Paperback
• Language: English
• ISBN: 173125458X
• ISBN13: 9781731254580
• Release Date: January 1
• Publisher: Independently Published
• Length: 142 Pages
• Weight: 0.76 lbs.
• Dimensions: 0.3" x 8.5" x 11.0"