국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	FLIGHT TEST TECHNIQUES USED TO EVALUATE PERFORMANCE BENEFITS DURING FORMATION FLIGHT
저자	Ronald J. Ray, Brent R. Cobleigh, M. Jake Vachon, and Clinton St. John
Keyword	Aircraft performance; drag reduction; drag measurement; performance tests; fuel consumption
URL	http://www.dfrc.nasa.gov/DTRS/2002/PDF/H-2500.pdf
보고서번호	NASA-TP-2002-210730
발행년도	2002
출처	NASA Dryden Flight Research Center
ABSTRACT	Previous investigations into formation flight have shown the possibility for significant fuel savings through drag reduction. Using two F/A-18 aircraft, NASA Dryden Flight Research Center has investigated flying aircraft in autonomous formation. Positioning the trailing airplane for best drag reduction requires investigation of the wingtip vortex effects induced by the leading airplane. A full accounting of the vortex effect on the trailing airplane is desired to validate vortex-effect prediction methods and provide a database for the design of a formation flight autopilot. A recent flight phase has mapped the complete wingtip vortex effects at two flight conditions with the trailing airplane at varying distances behind the leading one. Force and moment data at Mach 0.56 and an altitude of 25,000 ft and Mach 0.86 and an altitude of 36,000 ft have been obtained with 20, 55, 110, and 190 ft of longitudinal distance between the aircraft. The moments induced by the vortex on the trailing airplane were well within the pilot뭩 ability to control. This report discusses the data analysis methods and vortex-induced effects on moments and side force. An assessment of the impact of the nonlinear vortex effects on the design of a formation autopilot is offered.