국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	IN-FLIGHT IMAGING OF TRANSVERSE GAS JETS INJECTED INTO TRANSONIC AND SUPERSONIC CROSSFLOWS: DESIGN AND DEVELOPMENT
저자	Kon-Sheng Charles Wang
Keyword	F-104; Flight test; Flight test fixture; Flow visualization; Imaging; Injection; Nd: YAG laser; Planar laser-induced fluorescence (PLIF); Supersonic; Transonic; Transverse jet
URL	http://www.dfrc.nasa.gov/DTRS/1994/PDF/H-2027.pdf
보고서번호	NASA-CR-186031
발행년도	1994
출처	NASA Dryden Flight Research Center
ABSTRACT	The design and development of an airborne flight-test experiment to study nonreacting gas jets injected transversely into transonic and supersonic crossflows is presented. Free-stream/crossflow Mach numbers range from 0.8 to 2.0. Planar laser-induced fluorescence (PLIF) of an iodine-seeded nitrogen jet is used to visualize the jet flow. Time-dependent images are obtained with a high-speed intensified video camera synchronized to the laser pulse rate. The entire experimental assembly is configured compactly inside a unique flight-test-fixture (FTF) mounted under the fuselage of the F-104G research aircraft, which serves as a 밼lying wind tunnel?at NASA Dryden Flight Research Center. The aircraft is flown at predetermined speeds and altitudes to permit a perfectly expanded (or slightly underexpanded) gas jet to form just outside the FTF at each free stream Mach number. Recorded gas jet images are then digitized to allow analysis of jet trajectory, spreading, and mixing characteristics. Comparisons will be made with analytical and numerical predictions. (Results presented in AIAA CP-95-0516). This study shows the viability of applying highly sophisticated ground-based flow diagnostic techniques to flight-test vehicle platforms that can achieve a wide range of thermo/fluid dynamic conditions. Realistic flow environments, high enthalpies, unconstrained flow-fields, and moderate operating costs are also realized, in contrast to traditional wind-tunnel testing.