GLTRS--Glenn
TITLE AND SUBTITLE:
A Study of Large Droplet Ice Accretions in the NASA Glenn IRT at Near-Freezing Conditions

AUTHOR(S):
Dean R. Miller, Harold E. Addy, Jr., and Robert F. Ide

REPORT DATE:
June 2005

FUNDING NUMBERS:
WU-505-68-10

PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
John H. Glenn Research Center at Lewis Field
Cleveland, Ohio 44135-3191

PERFORMING ORGANIZATION REPORT NUMBER:
E-10072-1

SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
Washington, DC 20546-0001

REPORT TYPE AND DATES COVERED:
Technical Memorandum

SPONSORING/MONITORING AGENCY REPORT NUMBER:
NASA TM-1996-107142-REV1
ARL-MR-294
AIAA-96-0934

SUPPLEMENTARY NOTES:
Prepared for the 34th Aerospace Sciences Meeting and Exhibit sponsored by the American Society of Aeronautics and Astronautics, Reno, Nevada, January 15-18, 1996. Dean R. Miller and Harold E. Addy, Jr., NASA Glenn Research Center; and Robert F. Ide, U.S. Army Research Laboratory, NASA Glenn Research Center. Responsible person, Dean R. Miller, organization code RTI, 216-433-5349.

ABSTRACT:
This report documents the results of an experimental study on large droplet ice accretions which was conducted in the NASA Glenn Icing Research Tunnel (IRT) with a full-scale 77.25 inch chord Twin-Otter wing section. This study was intended to: (1) document the existing capability of the IRT to produce a large droplet icing cloud, and (2) study the effect of various parameters on large droplet ice accretions. Results are presented from a study of the IRT's capability to produce large droplets with MVD of 99 and 160 μm. The effect of the initial water droplet temperature on the resultant ice accretion was studied for different initial spray bar air and water temperatures. The initial spray bar water temperature was found to have no discernible effect upon the large droplet ice accretions. Also, analytical and experimental results suggest that the water droplet natural icing condition. The effect of temperature, droplet size, airspeed, angle-of-attack, flap setting and de-icer boot cycling time on ice accretion was studied, and will be discussed in this report. It was found that, in almost all of the cases studied, an ice ridge formed immediately aft of the active portion of the de-icer boot. This ridge was irregular in shape, varied in location, and was in some cases, discontinuous due to aerodynamic shedding.

SUBJECT TERMS:
Supercooled large droplet icing; Aircraft hazards; Aeronautics

NUMBER OF PAGES:
33

PDF AVAILABLE FROM URL:
2005/TM-1996-107142-REV1.pdf ( 4,241 KB )
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