Full-scale wind-tunnel simulation of takeoff performance degradation with contaminated fluid runback

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TypeTechnical Report
Series titleTransport Canada Reports; no. TP 13925E
Subjectaircraft ground icing; Type I de-icing fluids; Type II anti-icing fluids; Type IV anti-icing fluids
AbstractAn exploratory investigation was conducted to estimate the aerodynamic performance penalties produced by de- and anti-icing fluids. This investigation included experiments using both neat and diluted fluids as well as fluids that had been contaminated by freezing precipitation. The experiments were carried out in National Research Council Canada’s 3 m x 6 m open circuit Propulsion Wind Tunnel. The model was a two-dimensional, single-element NACA 23012 aerofoil of 1.5 m chord. The investigation showed that the flow of anti-icing fluids during the take-off roll and rotation was dominated by waves with a height of about 0.5 mm. These waves produced a small, temporary lift loss during rotation, with no significant impact on the model’s stall characteristics. The contamination of anti-icing fluids by freezing precipitation resulted in a decrease in the aerofoil stall margin of up to 3.3 deg with a lift loss of up to 9.8 percent just prior to stall. The growth of a layer of frost on a simulated cold-soaked unprotected aerofoil caused a decrease in stall margin of 4.5 deg, with a lift loss of approximately 18.6 percent. The application of results such as these to the future refinement of airline operations and aviation regulations could lead to safer operations under ground icing conditions.
AffiliationNRC Institute for Aerospace Research; National Research Council Canada
Access conditionavailable
Peer reviewedNo
NRC numberAL-2002-0130
NPARC number8933836
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Record identifier5b2f46ff-0183-42fd-968b-cda0385c264b
Record created2009-04-23
Record modified2016-10-03
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