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Improvement of Lift Dump on a Fighter-Type Wing at Approach Condition

  • 발행 : 2005.12.31

초록

The 1/9-scale model of a fighter-type configuration was tested in the Micro-Craft 8ft ${\times}$ 12ft wind tunnel facility. An abrupt lift dump was found at a certain range of angle of attack under the pre-scheduled approach configuration. To avoid a probable unsatisfactory flight behavior due to the lift dump, various aerodynamic devices were suggested. Extensive tests applying the cutoff leading edge flaps, boundary layer fences, saw tooth and vortex generators were performed with flow visualization as well as force and moment measurements. Test results showed that the origin of the lift dump was caused by the secondary boundary layer flow separation generated from the strong interaction between wing and flap. Various solutions for avoiding the unfavorable feature were suggested with the merits and demerits.

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참고문헌

  1. H. Roh and I. Lee, 'A Study of Lift Bubble Phenomena in KTX -2 Powered Approach Configuration', KSASS Conference, Seoul, Korea, April 2000
  2. Ray Whitford, 'Design for Air Combat', Jane's, 1987
  3. S. Hwang and Y. Kim, '85PR0099 KTX -2 '99 #2-2P Low Speed Wind Tunnel Test Report', Korea Aerospace Ind., July, 1999
  4. I. Lee and Y. Lee, '85PR0145 KTX-2 '99 #2-2 Low Speed Wind Tunnel Test Report', Korea Aerospace Ind., August, 1999
  5. Hermann Schlichting, 'Boundary Layer Theory', McGraw-Hill, 1979
  6. I. Lee and Y. Lee, '85PR0100 KTX-2 '99 High Speed Wind Tunnel Test Report', Korea Aerospace Ind., April, 1999