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Forebody Flow Visualization On Th F 18 Harv With Actuated Forebody Strakes
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Book Synopsis Forebody Flow Visualization on the F-18 HARV with Actuated Forebody Strakes by : David F. Fisher
Download or read book Forebody Flow Visualization on the F-18 HARV with Actuated Forebody Strakes written by David F. Fisher and published by . This book was released on 1998 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: Off-surface smoke flow visualization and extensive pressure measurements were obtained on the forebody of the NASA F-18 High Alpha Research Vehicle equipped with actuated forebody strakes. Test points at [alpha]=50 deg. were examined in which only one strake was deflected or in which both strakes were deflected differentially. The forebody pressures were integrated to obtain forebody yawing moments. Results showed that small single strake deflections can cause an undesirable yawing moment reversal. At [alpha]=50 deg., this reversal was corrected by deploying both strakes at 20 deg. initially, then differentially from 20 deg. to create a yawing moment. The off-surface flow visualization showed that in the case of the small single strake deflection, the resulting forebody/strake vortex remained close to the surface and caused accelerated flow and increased suction pressures on the deflected side. When both strakes were deflected differentially, two forebody/strake vortices were present. The forebody/strake vortex from the larger deflection would lift from the surface while the other would remain close to the surface. The nearer forebody/strake vortex would cause greater flow acceleration, higher suction pressures and a yawing moment on that side ot the forebody. Flow visualization provided clear description of the strake vortices fluid mechanics.
Book Synopsis Forebody Flow Visualization on Th F-18 HARV with Actuated Forebody Strakes by : David F. Fisher
Download or read book Forebody Flow Visualization on Th F-18 HARV with Actuated Forebody Strakes written by David F. Fisher and published by . This book was released on 1998 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Actuated Forebody Strakes on the Forebody Aerodynamics of the NASA F-18 HARV by : David F. Fisher
Download or read book Effect of Actuated Forebody Strakes on the Forebody Aerodynamics of the NASA F-18 HARV written by David F. Fisher and published by . This book was released on 1996 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722188795 Total Pages :36 pages Book Rating :4.1/5 (887 download)
Book Synopsis Effect of Actuated Forebody Strakes on the Forebody Aerodynamics of the NASA F-18 Harv by : National Aeronautics and Space Administration (NASA)
Download or read book Effect of Actuated Forebody Strakes on the Forebody Aerodynamics of the NASA F-18 Harv written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-02 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 angles of attack greater than 40 deg., deflecting one strake at a time resulted in a forebody yawing moment control reversal for small strake deflection angles. At alpha = 40 deg. and 50 deg., 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 alpha = 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. Fisher, David F. and Murri, Daniel G. and Lanser, Wendy R. Unspecified Center RTOP 505-68-30...
Book Synopsis Forebody Aerodynamics of the F-18 High Alpha Research Vehicle with Actuated Strakes by :
Download or read book Forebody Aerodynamics of the F-18 High Alpha Research Vehicle with Actuated Strakes written by and published by . This book was released on 2003 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 500-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 200 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 500 and for O% and 200 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.
Book Synopsis Effect of Actuated Forebody Strakes on the Forebody Aerodynamics of the NASA F-18 HARV by : David F. Fisher
Download or read book Effect of Actuated Forebody Strakes on the Forebody Aerodynamics of the NASA F-18 HARV written by David F. Fisher and published by . This book was released on 1996 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Wind Tunnel Investigations of Forebody Strakes for Yaw Control on F/A-18 Model at Subsonic and Transonic Speeds by : Gary E. Erickson
Download or read book Wind Tunnel Investigations of Forebody Strakes for Yaw Control on F/A-18 Model at Subsonic and Transonic Speeds written by Gary E. Erickson and published by . This book was released on 1993 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Memorandum written by and published by . This book was released on 1991 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis NASA Aerodynamics Program : Annual Report 1990 by : Louis J. Williams
Download or read book NASA Aerodynamics Program : Annual Report 1990 written by Louis J. Williams and published by . This book was released on 1991 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flight Test Maneuvers for Closed Loop Lateral-directional Modeling of the F-18 High Alpha Research Vehicle (HARV) Using Forebody Strakes by : E. A. Morelli
Download or read book Flight Test Maneuvers for Closed Loop Lateral-directional Modeling of the F-18 High Alpha Research Vehicle (HARV) Using Forebody Strakes written by E. A. Morelli and published by . This book was released on 1996 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flight test maneuvers are specified for the F-18 High Alpha Research Vehicle (HARV). The maneuvers were designed for closed loop parameter identification purposes, specifically for lateral linear model parameter estimation at 30, 45, and 60 degrees angle of attack, using the Actuated Nose Strakes for Enhanced Rolling (ANSER) control law in Strake (S) model and Strake/Thrust Vectoring (STV) mode. Each maneuver is to be realized by applying square wave inputs to specific pilot station controls using the On-Board Excitation System (OBES). Maneuver descriptions and complete specification of the time/amplitude points defining each input are included, along with plots of the input time histories.
Book Synopsis F/A-18 Forebody Vortex Control: Static tests by :
Download or read book F/A-18 Forebody Vortex Control: Static tests written by and published by . This book was released on 1994 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis F/A-18 Forebody Vortex Control. Volume 1: Static Tests by :
Download or read book F/A-18 Forebody Vortex Control. Volume 1: Static Tests written by and published by . This book was released on 1994 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722620820 Total Pages :92 pages Book Rating :4.6/5 (28 download)
Book Synopsis Low-Speed Wind-Tunnel Investigation of a Porous Forebody and Nose Strakes for Yaw Control of a Multirole Fighter Aircraft by : National Aeronautics and Space Administration (NASA)
Download or read book Low-Speed Wind-Tunnel Investigation of a Porous Forebody and Nose Strakes for Yaw Control of a Multirole Fighter Aircraft written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-08 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: Low-speed wind-tunnel tests were conducted in the Langley 12-Foot Low-Speed Tunnel on a model of the Boeing Multirole Fighter (BMRF) aircraft. This single-seat, single-engine configuration was intended to be an F-16 replacement that would incorporate many of the design goals and advanced technologies of the F-22. Its mission requirements included supersonic cruise without afterburner, reduced observability, and the ability to attack both air-to-air and air-to-ground targets. So that it would be effective in all phases of air combat, the ability to maneuver at angles of attack up to and beyond maximum lift was also desired. Traditional aerodynamic yaw controls, such as rudders, are typically ineffective at these higher angles of attack because they are usually located in the wake from the wings and fuselage. For this reason, this study focused on investigating forebody-mounted controls that produces yawing moments by modifying the strong vortex flowfield being shed from the forebody at high angles of attack. Two forebody strakes were tested that varied in planform and chordwise location. Various patterns of porosity in the forebody skin were also tested that differed in their radial coverage and chordwise location. The tests were performed at a dynamic pressure of 4 lb/ft(exp 2) over an angle-of-attack range of -4 deg to 72 deg and a sideslip range of -10 deg to 10 deg. Static force data, static pressures on the surface of the forebody, and videotapes of flow-visualization using laser-illuminated smoke were obtained. Fears, Scott P. Unspecified Center...
Book Synopsis Monthly Catalog of United States Government Publications by :
Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1999 with total page 1144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The F/A-18 High-Angle-of-Attack Ground-to-Flight Correlation; Lessons Learned by :
Download or read book The F/A-18 High-Angle-of-Attack Ground-to-Flight Correlation; Lessons Learned written by and published by . This book was released on 1997 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 694 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Summary of the Forebody High-angle-of-attack Aerodynamics Research on the F-18 and the X-29A Aircraft by :
Download or read book A Summary of the Forebody High-angle-of-attack Aerodynamics Research on the F-18 and the X-29A Aircraft written by and published by . This book was released on 1992 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
