SCIENTIFIC AND TECHNICAL AEROSPACE REPORTS
A Biweekly Publication of the National Aeronautics and Space Administration
VOLUME 44, ISSUE 10 - MAY 19, 2006
02 AERODYNAMICS
Includes aerodynamics of flight vehicles, test bodies, airframe components and combinations, wings, and control surfaces.
Also includes aerodynamics of rotors, stators, fans, and other elements of turbomachinery.
For related information see also 34 Fluid Mechanics and Thermodynamics.
20060013038 National Center for Atmospheric Research, Boulder, CO USA
Ensurance Time Tests Using the NCAR Snow Machine: Results of Round-Robin Tests Using a Constant Test Plate Temperature
Rasmussen, R. M.; Tryhane, M.; Landolt, S.; Hills, A.; Mar. 2006; 46 pp.; In English Report No.(s): PB2006-109053; No Copyright; Avail.: National Technical Information Service (NTIS)
This report summarizes the results of round-robin tests with the National Center for Atmospheric Research (NCAR), Aviation Planning Services (APS), and Anti-icing Materials International Laboratory (AMIL) snow machines using a constant plate temperature.
Previous results from snow indoor tests showed shorter fluid endurance times of anti-icing fluids for the NCAR snow machine compared to outdoor natural tests. A consistent result of the previous study was higher plate temperatures for outdoor tests exposed to wind compared to indoor tests not exposed to wind. A lower plate temperature will change fluid properties, such as viscosity and surface tension, and therefore, also affect fluid flow behavior and consequently endurance time. Previous tests have shown that most fluids show longer endurance times for warmer plate temperatures, and thus the shorter endurance times observed for the NCAR snow machine may possibly be explained by the lower plate temperatures. The previous report suggested that a method to reduce the bias would be to conduct the indoor snow machine tests at a selected plate temperature that better simulates the affects of the wind.
Preliminary results from APS, AMIL, and NCAR all showed improved agreement with the outdoor tests when this procedure was used. The suggested method was tested during the winter of 2003/2004 by conducting indoor round-robin tests with the NCAR, APS, and AMIL snow machines employing selected outdoor snow conditions. The indoor test conditions used commonly agreed to constant plate temperatures for each test and were based upon outdoor tests conducted by APS in previous years. APS provided the outdoor conditions and constant plate temperature to each laboratory, and each laboratory conducted as many of the tests as practicable. NCAR conducted 82 indoor tests at conditions previously tested outdoors and provided the resulting snow machine results to all the other laboratories. The results of these 82 tests and an intercomparison to the other laboratory results are provided in this report. NTIS
Antiicing Additives; Ice Prevention; Snow
Source: NASA
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