Polhamus, Edward C. Langley Research Center, National Aeronautics and Space Administration, Hampton, Virginia.
- Additional Reading
The slender forward extension of the inboard region of the wing of a combat aircraft used to provide increased lift in the high angle-of-attack maneuvering condition. In contrast to the normal attached-flow design principles, these strakes are built to allow the flow to separate along the leading edge in the high angle-of-attack range and to roll up into strong leading-edge vortices. The illustration shows a typical strake installation and the vortices generated. These are highly stable, and their strong swirling motion creates a lower pressure area on the strake upper surface, resulting in a large incremental increase in lift force known as vortex lift. This vortex lift increases rapidly in the high angle-of-attack range and is less susceptible to the normal stalling characteristics encountered with conventional lifting surfaces. These vortices can also improve the high angle-of-attack lift effectiveness of the main wing panels. This high angle-of-attack lift capability, when coupled with the fact that these slender surfaces are of relatively low structural weight, has resulted in their incorporation as a primary design feature of several modern lightweight and highly maneuverable fighter aircraft. Two examples of the application of vortex lift strakes (sometimes referred to as leading-edge extensions) are the Air Force F-16 and the Navy F-18. See also: Aerodynamic force; Airfoil; Subsonic flight; Vortex; Wing structure
The content above is only an excerpt.
for your institution. Subscribe
To learn more about subscribing to AccessScience, or to request a no-risk trial of this award-winning scientific reference for your institution, fill in your information and a member of our Sales Team will contact you as soon as possible.
to your librarian. Recommend
Let your librarian know about the award-winning gateway to the most trustworthy and accurate scientific information.
AccessScience provides the most accurate and trustworthy scientific information available.
Recognized as an award-winning gateway to scientific knowledge, AccessScience is an amazing online resource that contains high-quality reference material written specifically for students. Contributors include more than 10,000 highly qualified scientists and 45 Nobel Prize winners.
MORE THAN 8700 articles covering all major scientific disciplines and encompassing the McGraw-Hill Encyclopedia of Science & Technology and McGraw-Hill Yearbook of Science & Technology
115,000-PLUS definitions from the McGraw-Hill Dictionary of Scientific and Technical Terms
3000 biographies of notable scientific figures
MORE THAN 19,000 downloadable images and animations illustrating key topics
ENGAGING VIDEOS highlighting the life and work of award-winning scientists
SUGGESTIONS FOR FURTHER STUDY and additional readings to guide students to deeper understanding and research
LINKS TO CITABLE LITERATURE help students expand their knowledge using primary sources of information