World Library  
Flag as Inappropriate
Email this Article

Vortilon

Article Id: WHEBN0033337376
Reproduction Date:

Title: Vortilon  
Author: World Heritage Encyclopedia
Language: English
Subject: Gust lock, Wingbox, Jury strut, Emergency oxygen system, Townend ring
Collection:
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Vortilon

Vortilons can be seen projecting from underneath the center leading edge of the wings of this Hawker 850XP

Vortilons are fixed aerodynamic devices on aircraft wings used to improve handling at low speeds.[1]

Vortilon is a contraction of VORTex and pYLON words (generating vortices as a leading-edge engine pylon does).

Vortilons consist of one or more flat plates attached to the underside of the wing near its leading edge, aligned with the flight direction.[2] When the speed is reduced and the aircraft approaches stall, the local flow at the leading edge is diverted outwards; this spanwise component of velocity around the vortilon creates a vortex streamed around the top surface, which energises the boundary layer.[2] A more turbulent boundary layer, in turn, delays the local flow separation.

Vortilons are often used to improve low-speed aileron performance,[1][3] thereby increasing resistance to spin. They can be used as an alternative to wing fences, which also restrict airflow along the span of the wing.[1] Vortilons only stream vortices at high angles of attack[4] and produce less drag at higher speeds than wing fences.[5] Pylons used to mount jet engines under the wing produce a similar effect.[6]

The occurrence of span-wise flow at high angles of attack, such as observed on swept wings, is an essential requirement for vortilons to become effective. According to Burt Rutan, vortilons installed on straight wings would not have any effect.[7]

Vortilons were introduced in the McDonnell Douglas DC-9 to overcome deep stalling issues.[6][8][9] They have been used on subsequent aircraft, including:

See also

References

  1. ^ a b c d "Unicom". Flying: 75. July 2002. Retrieved 2011-10-07. 
  2. ^ a b Raymer, Daniel P. (1999). "8.2 Aerodynamic Considerations in Configuration Layout". Aircraft Design: A Conceptual Approach (3rd ed.). Reston, Virginia: American Institute of Aeronautics and Astronautics. p. 183.  
  3. ^ a b McClellan, J. Mac (November 2002). "Hawker 800XP". Flying: 75. Retrieved 2011-10-07. 
  4. ^ Barnard, R.H.; Philpott, D.R. (2010). "Boundary layer and stalling problems on swept wings". Aircraft Flight (4th ed.). Harlow, England: Prentice Hall. p. 75.  
  5. ^ a b McClellan, J. Mac (February 1993). "BAE 1000 Lifts Hawker Name to New Heights". Flying: 88. Retrieved 2011-10-07. 
  6. ^ a b "The DC-9 and the Deep Stall". FLIGHT International: 442. 25 March 1965. Retrieved 2011-10-07. 
  7. ^ Vortilons for Variezes, The canard pusher, n°42, October 1984
  8. ^ Norris, Guy; Wagner, Mark (1999). Douglas Airliners. Oceola, Wisconsin: MBI Publishing Company. p. 24. 
  9. ^ Shevell, Richard S.; Schaufele, Roger D. (November–December 1966). "Aerodynamic Design Features of the DC-9". Journal of Aircraft 3 (6): 515–523. 
  10. ^ a b Smith, Steve. "Resources for learning about vortilons". NASA Quest. Retrieved 2011-10-07. 

External links

  • Wing Vortex Devices from Aerospaceweb.org explains vortilons and other vortex-generating wing appliances
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 



Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.