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    기술보고서 게시판 내용
    타이틀 FOREBODY AERODYNAMICS OF THE F-18 HIGH ALPHA RESEARCH VEHICLE WITH ACTUATED FOREBODY STRAKES
    저자 David F. Fisher and Daniel G. Muri
    Keyword Aircraft; F-18; Flight; Flight Test; Flow visualization; Forebody; Smoke; Strake;Vortex; Vortical flow
    URL http://www.dfrc.nasa.gov/DTRS/2001/PDF/H-2447.pdf
    보고서번호 NASA-MP-69-P-45
    발행년도 2001
    출처 NASA Dryden Flight Research Center
    ABSTRACT Extensive pressure measurements and off-surface flow visualization were obtained on the forebody and strakes of the NASA F-18 High Alpha Research Vehicle (HARV) equipped with actuated forebody strakes.Forebody yawing moments were obtained by integrating the circumferential pressures on the forebody and strakes. Results show that large yawing moments can be generated with forebody strakes. At a 50 deg-angle-of-attack, deflecting one strake at a time resulted in a forebody yawing moment control reversal for small strake deflection angles. However, deflecting the strakes differentially about a 20 deg symmetric strake deployment eliminated the control reversal and produced a near linear variation of forebody yawing moment with differential strake deflection. At an angle of attack of 50 deg and for 0 deg and 20 deg symmetric strake deployments, a larger forebody yawing moment was generated by the forward fuselage (between the radome and the apex of the leading-edge extensions) than on the radome where the actuated forebody strakes were located. Cutouts on the flight vehicle strakes that were not on the wind tunnel models are believed to be responsible for deficits in the suction peaks on the flight radome pressure distributions and differences in the forebody yawing moments.

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