Scaling of Lift Degradation Due to Anti-Icing Fluids Based Upon the Aerodynamic Acceptance Test

In recent years, the Federal Aviation Administration (FAA) has worked with Transport Canada, National Research Council Canada and APS Aviation, Inc. to develop allowance times for aircraft operations in ice-pellet precipitation. These allowance times are critical to ensure safety and efficient operation of commercial and cargo flights. Wind-tunnel testing with uncontaminated anti-icing fluids and fluids contaminated with simulated ice pellets had been carried out at the NRC Propulsion and Icing Wind Tunnel (PIWT) to better understand the flowoff characteristics and resulting aerodynamic effects. The percent lift loss on the thin, high-performance wing model tested in the PIWT was determined at 8° angle of attack and used as one of the evaluation criteria in determining the allowance times. Because it was unclear as to how performance degradations measured on this model were relevant to an actual airplane configuration, some means of interpreting the wing model lift loss was deemed necessary. This paper describes how the lift loss was related to the loss in maximum lift of a Boeing 737-200ADV airplane through the Aerodynamic Acceptance Test (AAT) performed for fluids qualification. A loss in maximum lift coefficient of 5.24 percent on the B737-200ADV airplane (which was adopted as the threshold in the AAT) corresponds to a lift loss of 7.3 percent on the PIWT model at 8° angle of attack. There is significant scatter in the data used to develop the correlation related to varying effects of the anti-icing fluids that were tested and other factors. A statistical analysis indicated the upper limit of lift loss on the PIWT model was 9.2 percent. Therefore,for cases resulting in PIWT model lift loss from 7.3 to 9.2 percent, extra scrutiny of the visual observations is required in evaluating fluid performance with contamination.

• Record URL:
  http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20120014612_2012015213.pdf
• 
• Supplemental Notes:
  • This paper was prepared for the Atmospheric Space Environments Conference sponsored by the American Institute of Aeronautics and Astronautics (AIAA), New Orleans, Louisiana, June 25–28, 2012.
• Corporate Authors:

  National Aeronautics and Space Administration

  John H. Glenn Research Center at Lewis Field
  Cleveland, OH  United States  44135

  National Aeronautics and Space Administration

  Washington, DC  United States  20546
• Authors:
  • Broeren, Andy P
  • Riley, James T
• Publication Date: 2012-8

Language

• English

Media Info

• Media Type: Digital/other
• Edition: Technical Memorandum
• Features: Figures; Photos; References; Tables;
• Pagination: 30p

Subject/Index Terms

• TRT Terms: Acceptance tests; Aerodynamic lift; Aerodynamics; Anti-icing; Wind tunnels
• Identifier Terms: Boeing 737 aircraft
• Uncontrolled Terms: Anti-icing fluids
• Subject Areas: Aviation; Research; I90: Vehicles;

Filing Info

• Accession Number: 01483380
• Record Type: Publication
• Report/Paper Numbers: NASA/TM—2012-217701, AIAA–2012–2800, E-18388
• Files: TRIS
• Created Date: May 31 2013 9:55AM