Assessment of Low-Speed, High Lift Capability of "Diamond" Planform Wings with Mach and Reynolds Number Effects and Possible Improvements.
NANGIA AERO RESEARCH ASSOCIATES BRISTOL (UNITED KINGDOM)
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As a result of USAF-EOARD sponsored Window-on-Science visit to WL and AFOSR Apr 92 several areas of mutual interest were identified. One of the aspects concerning high lift development on highly tapered diamond type stealthy planforms is being currently undertaken under the part sponsorship of the USAF-EOARD. For reasons of stealth, highly tapered wings of diamond planform are being actively pursued for practical application on advanced fighter aircraft. Such wings are known to be prone to flow separations at the wing tip. The underlying philosophy of the work program on this class of aircraft is to maximize the performance and subsonic-transonic maneuverability within the constraints imposed by low radar signature. LE and TE devices are therefore incorporated and the high lift performance needs to be assessed theoretically and experimentally. This report highlights two main objectives 1 to assess the given diamond cambered and twisted wing with and without LE and TE flaps and 2 to indicate possible improvements. These two objectives lead also to the methodology for dealing with such wings when more accurate design information may be required in future. The premise is that such information will lead to an appreciation of compromises between constraints imposed by radar signature considerations and aerodynamic performance.