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Development Of A Device For Controlling The Leading Edge Vortices Ona Delta Wing
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Book Synopsis Development of a Device for Controlling the Leading Edge Vortices on a Delta Wing by : Mohamed Gad-el-Hak
Download or read book Development of a Device for Controlling the Leading Edge Vortices on a Delta Wing written by Mohamed Gad-el-Hak and published by . This book was released on 1986 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent experimental observations have shown that a leading edge vortex on a delta wing at constant angle of attack consists of a series of discrete smaller vortices. These vortices pair, much the same as in a free shear layer. A device is proposed to modulate the shedding and the pairing of the discrete vortices by mechanically or acoustically perturbing the leading edge of a delta wing. By applying the perturbation to both leading edges, the total lift of a wing will be altered; alternatively, by using the perturbation preferentially on only one side of the wing, the rolling moment around the axis of symmetry of the aircraft is controlled. The proposed device will enable the pilot of a fighter aircraft to achieve a previously unattained degree of maneuverability. During the first phase of this research, experiments were conducted in both a water towing tank and a high speed wind tunnel. Flow visualization, fast-response velocity probe surveys, as well as force measurements were conducted to assess the performance of the proposed vortex control device and, more importantly at this early stage of the research, to understand the complex flow field under consideration. Keywords: Vortex control device; Lift control; Lift enhancement; Super-maneuverability.
Book Synopsis Development of a Device for Controlling the Leading Edge Vortices Ona Delta Wing by : Mohamed Gad-el-Hak
Download or read book Development of a Device for Controlling the Leading Edge Vortices Ona Delta Wing written by Mohamed Gad-el-Hak and published by . This book was released on 1986 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Control of Leading-edge Vortices on a Delta Wing by : C. Magness
Download or read book Control of Leading-edge Vortices on a Delta Wing written by C. Magness and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Control of Vortex Breakdown on a Delta Wing by Leading Edge Blowing and Suction by : H. Q. Yang
Download or read book Control of Vortex Breakdown on a Delta Wing by Leading Edge Blowing and Suction written by H. Q. Yang and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Unsteady Structure of Leading-Edge Vortices on a Delta Wing by :
Download or read book Unsteady Structure of Leading-Edge Vortices on a Delta Wing written by and published by . This book was released on 1994 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The overall objective of this research program was to characterize the unsteady flow structure on wings having swept edges. Wings were subjected to global control, involving motion of the entire wing, and local control, involving perturbations at specified locations on the surface of the wing. New types of experimental facilities and image acquisition and processing techniques have allowed determination of the instantaneous vorticity distributions and streamline patterns of the flow. The occurrence of vortex breakdown and stall and their phase shifts relative to the wing motion and to control at the leading-edges have been interpreted in terms of new flow mechanisms. Delta Wings, Vortex Breakdown, Laser Diagnostics.
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 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781723082115 Total Pages :130 pages Book Rating :4.0/5 (821 download)
Book Synopsis Flow Field Over the Wing of a Delta-Wing Fighter Model with Vortex Control Devices at Mach 0. 6 To 1. 2 by : National Aeronautics and Space Administration (NASA)
Download or read book Flow Field Over the Wing of a Delta-Wing Fighter Model with Vortex Control Devices at Mach 0. 6 To 1. 2 written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-17 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: As part of a cooperative research program between NASA, McDonnell Douglas Corporation, and Wright Research and Development Center, a flow field investigation was conducted on a 7.52 percent scale windtunnel model of an advanced fighter aircraft design. The investigation was conducted in the Langley 16 ft Transonic Tunnel at Mach numbers of 0.6, 0.9, and 1.2. Angle of attack was varied from -4 degrees to 30 degrees and the model was tested at angles of sideslip of 0, 5, and -5 degrees. Data for the over the wing flow field were obtained at four axial survey stations by the use of six 5 hole conical probes mounted on a survey mechanism. The wing leading edge primary vortex exerted the greatest influence in terms of total pressure loss on the over the wing flow field in the area surveyed. A number of vortex control devices were also investigated. They included two different apex flaps, wing leading edge vortex flaps, and small large wing fences. The vortex flap and both apex flaps were beneficial in controlling the wing leading edge primary vortex. Bare, E. Ann and Reubush, David E. and Haddad, Raymond C. Langley Research Center DELTA WINGS; FIGHTER AIRCRAFT; FLOW DISTRIBUTION; SUBSONIC SPEED; TRANSONIC SPEED; VORTEX FLAPS; WIND TUNNEL MODELS; WIND TUNNEL TESTS; ANGLE OF ATTACK; FLOW VISUALIZATION; MACH NUMBER; PRESSURE DISTRIBUTION; SIDESLIP; TRANSONIC WIND TUNNELS...
Book Synopsis Leading Edge Vortex Flow Control on a Delta Wing with Dielectric Barrier Discharge Plasma Actuators by : Lu Shen
Download or read book Leading Edge Vortex Flow Control on a Delta Wing with Dielectric Barrier Discharge Plasma Actuators written by Lu Shen and published by . This book was released on 2014 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flow Field Over the Wing of a Delta-wing Fighter Model with Vortex Control Devices at Mach 0.6 to 1.2 by : E. Ann Bare
Download or read book Flow Field Over the Wing of a Delta-wing Fighter Model with Vortex Control Devices at Mach 0.6 to 1.2 written by E. Ann Bare and published by . This book was released on 1992 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Visualization of Leading Edge Vortices on a Series of Flat Plate Delta Wings by : Francis M. Payne
Download or read book Visualization of Leading Edge Vortices on a Series of Flat Plate Delta Wings written by Francis M. Payne and published by . This book was released on 1991 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Investigation of the Breakdown of the Leading Edge Vortices on a Delta Wing at High Angles of Attack by : John F. McKernan
Download or read book An Investigation of the Breakdown of the Leading Edge Vortices on a Delta Wing at High Angles of Attack written by John F. McKernan and published by . This book was released on 1983 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Unsteady Response of the Leading-edge Vortices on a Pitching Delta Wing by : Charles L. Magness
Download or read book Unsteady Response of the Leading-edge Vortices on a Pitching Delta Wing written by Charles L. Magness and published by . This book was released on 1991 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Characterization and Control of Vortex Breakdown Over a Delta Wing at High Angles of Attack by : Anthony M. Mitchell
Download or read book Characterization and Control of Vortex Breakdown Over a Delta Wing at High Angles of Attack written by Anthony M. Mitchell and published by . This book was released on 2000-08-01 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: Demands for more maneuverable and stealthy air vehicles have encouraged the development of new control concepts for separated flows. The goalof this research is the control of leading-edge vortex breakdown by open-loop, along-the-core blowing near the apex of a delta wing to improve lift and maneuverability at high angles of attack. Control is dependent on the knowledge of and the ability to detect principle characteristics of the phenomena. Therefore, an experimental study of a 700 delta wing was accomplished to better understand the physical properties of the vortical flow and the vortex breakdownphenomena. Multiple experimental methods were used to characterize the flow field and its influence on the model's surfaces as well as to identify parameters for closed-loop feedback control.
Book Synopsis Active Flow Control of Delta Wing Leading-Edge Vortices by : Anja Kölzsch
Download or read book Active Flow Control of Delta Wing Leading-Edge Vortices written by Anja Kölzsch and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Leading Edge Vortex Dynamics on a Pitching Delta Wing by : Scott P. LeMay
Download or read book Leading Edge Vortex Dynamics on a Pitching Delta Wing written by Scott P. LeMay and published by . This book was released on 1987 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Leading Edge Vortex Dynamics on a Delta Wing Undergoing a Wing Rock Motion by : Y. W. Jun
Download or read book Leading Edge Vortex Dynamics on a Delta Wing Undergoing a Wing Rock Motion written by Y. W. Jun and published by . This book was released on 1987 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Controlled Vortical Flow on Delta Wings Through Unsteady Leading Edge Blowing by : National Aeronautics and Space Adm Nasa
Download or read book Controlled Vortical Flow on Delta Wings Through Unsteady Leading Edge Blowing written by National Aeronautics and Space Adm Nasa and published by . This book was released on 2018-11-18 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: The vortical flow over a delta wing contributes an important part of the lift - the so called nonlinear lift. Controlling this vortical flow with its favorable influence would enhance aircraft maneuverability at high angle of attack. Several previous studies have shown that control of the vortical flow field is possible through the use of blowing jets. The present experimental research studies vortical flow control by applying a new blowing scheme to the rounded leading edge of a delta wing; this blowing scheme is called Tangential Leading Edge Blowing (TLEB). Vortical flow response both to steady blowing and to unsteady blowing is investigated. It is found that TLEB can redevelop stable, strong vortices even in the post-stall angle of attack regime. Analysis of the steady data shows that the effect of leading edge blowing can be interpreted as an effective change in angle of attack. The examination of the fundamental time scales for vortical flow re-organization after the application of blowing for different initial states of the flow field is studied. Different time scales for flow re-organization are shown to depend upon the effective angle of attack. A faster response time can be achieved at angles of attack beyond stall by a suitable choice of the initial blowing momentum strength. Consequently, TLEB shows the potential of controlling the vortical flow over a wide range of angles of attack; i.e., in both for pre-stall and post-stall conditions. Lee, K. T. and Roberts, Leonard BLOWING; DELTA WINGS; FLOW DISTRIBUTION; LEADING EDGES; VORTICES; AIRCRAFT MANEUVERS; ANGLE OF ATTACK; MOMENTUM; NONLINEARITY; STABILITY...
