Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Unsteady Structure Of Leading Edge Vortices On A Delta Wing
Download Unsteady Structure Of Leading Edge Vortices On A Delta Wing full books in PDF, epub, and Kindle. Read online Unsteady Structure Of Leading Edge Vortices On A Delta Wing ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
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 Unsteady Structure of Leading-edge Vortex Flow Over a Delta Wing by : C. Shih
Download or read book Unsteady Structure of Leading-edge Vortex Flow Over a Delta Wing written by C. Shih and published by . This book was released on 1996 with total page 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 Controlled Vortical Flow on Delta Wings Through Unsteady Leading Edge Blowing by : K. T. Lee
Download or read book Controlled Vortical Flow on Delta Wings Through Unsteady Leading Edge Blowing written by K. T. Lee and published by . This book was released on 1990 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Unsteady Flow Structure from Swept Edges Subjected to Controlled Motion by :
Download or read book Unsteady Flow Structure from Swept Edges Subjected to Controlled Motion written by and published by . This book was released on 1990 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: This program addresses the unsteady flow structure and loading of delta wings subjected to controlled pitching motion. Efforts are focussed on three primary areas: generation of computer-aided techniques for quantitative interpretation of flow structure; development of new types of experimental instrumental and facilities; and characterization of the unsteady flow structure on delta wings. Computer applications for quantitative visualization of the vortex structure involve tracking of hydrogen bubble timelines and particles illuminated by scanning lasers. These techniques are integrated with active control systems that generate prescribed pitching motion of delta wings. Characterization of the unsteady flow structure is concerned with the response of the vortex breakdown to the motion of the wing and with preliminary consideration of the instantaneous cross-sectional structure of the leading edge vortices. The phase lag of these features of the flow structure, relative to the wing motion, is a central consideration.
Book Synopsis Computation of a Kelvin-Helmholtz Instability for Delta Wing Vortex Flows by : Raymond E. Gordnier
Download or read book Computation of a Kelvin-Helmholtz Instability for Delta Wing Vortex Flows written by Raymond E. Gordnier and published by . This book was released on 1991 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: The structure of the shear layer which emanates from the leading edge of a 76 degrees sweep delta wing and forms the primary vortex is investigated numerically. The flow conditions are M at infinity = 0.2, Re = 50,000 and angle of attack of 20.5 degrees. Computational results are obtained using a Beam- Warning type algorithm. The existence of a Kelvin-Helmholtz type instability of the shear layer which emanates from the leading edge of the delta wing is demonstrated. A description is provided of the three-dimensional, unsteady behavior of the small-scale vortices associated with this instability. The numerical results are compared qualitatively with experimental flow visualizations exhibiting similar behavior.
Book Synopsis Influence of Airfoil Geometry on Delta Wing Leading-edge Vortices and Vortex-induced Aerodynamics at Supersonic Speeds by : Richard M. Wood
Download or read book Influence of Airfoil Geometry on Delta Wing Leading-edge Vortices and Vortex-induced Aerodynamics at Supersonic Speeds written by Richard M. Wood and published by . This book was released on 1992 with total page 88 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...
Book Synopsis A Structure of Leading-edge and Tip Vortices at a Delta Wing by : Susumu Shirayama
Download or read book A Structure of Leading-edge and Tip Vortices at a Delta Wing written by Susumu Shirayama and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Computed Unsteady Structure of Spiral Vortex Breakdown on Delta Wings by : Miguel R. Visbal
Download or read book Computed Unsteady Structure of Spiral Vortex Breakdown on Delta Wings written by Miguel R. Visbal and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Visual Study of a Delta Wing in Steady and Unsteady Motion by : M. Gad-el-Hak
Download or read book A Visual Study of a Delta Wing in Steady and Unsteady Motion written by M. Gad-el-Hak and published by . This book was released on 1984 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two delta wings with a leading edge sweep of 45 deg and 60 deg were studied in a towing tank at chord Reynolds number up to 350,000. The wings were pitched about the quarter chord point through typical angles of attack of 15 deg + or - 15 deg, with a reduced frequency in the range of 0 to 3. In the steady state flow, dye visualizations revealed the existence of a shear layer near the leading edge that rolls up and forms discrete vortices parallel to the leading edge. These vortices were observed to pair at least once as they were convected downstream. Similar phenomena were observed in the unsteady case, except that the vortices shed from the leading edge were modulated and altered by the unsteady motion, which was an order of magnitude lower in frequency. In general, the unsteadiness delayed separation and promoted hysteresis similar to results obtained in unsteady two-dimensional airfoils.
Book Synopsis Unsteady Aerodynamics of Delta Wings Performing Maneuvers to High Angle of Attack by : Mohammad-Ameen M. Jarrah
Download or read book Unsteady Aerodynamics of Delta Wings Performing Maneuvers to High Angle of Attack written by Mohammad-Ameen M. Jarrah and published by . This book was released on 1988 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Unsteady Navier-Stokes Solutions for a Low Aspect Ratio Delta Wing by : Raymond E. Gordnier
Download or read book Unsteady Navier-Stokes Solutions for a Low Aspect Ratio Delta Wing written by Raymond E. Gordnier and published by . This book was released on 1990 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: A numerical investigation of the flow field about a 76-degree leading edge sweep delta wing at 20.5 degree angle of attack is presented. The computational results are obtained using a Beam-Warming algorithm with a Newton-like subiteration procedure. For M = 0.2 and Re = 900,000 an unsteady flow field is obtained which is shown to be physical in nature. The unsteady behaviour is a result of the existence of small-scale vortical structures that are associated with a Kelvin-Helmholtz type instability of the shear layer emanating form the leading edge of the delta wing. The computed results show qualitative agreement with other experimental and numerical findings.
Book Synopsis Computation of a Delta-wing Roll-and-hold Maneuver by : Raymond E. Gordnier
Download or read book Computation of a Delta-wing Roll-and-hold Maneuver written by Raymond E. Gordnier and published by . This book was released on 1993 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents computations of the flowfield around an 80 degree sweep delta wing undergoing a constant roll-rate maneuver from 0 to 45 degrees. The governing equations for the problem are the unsteady, three- dimensional Navier-Stokes equations. The equations are solved using the implicit, approximately-factored algorithm of Beam-Warming. Fixed roll angle results are also presented and compared with experimental measurements to demonstrate the ability of the numerical technique to accurately capture the flowfield around a rolled delta wing. The dynamic behaviors of the vortex position and strength, as well as their corresponding effect on surface pressure, lift and roll moment, are described. A simple, quasi-static explanation of these vortex behaviors based on effective angle-of-attack and sideslip angle is proposed ... Delta wing roll, Vortex dynamics, Vortical flow, Unsteady maneuver.
Book Synopsis An Experimental Investigation of Leading Edge Vortices and Passage to Stall of Nonslender Delta Wings by :
Download or read book An Experimental Investigation of Leading Edge Vortices and Passage to Stall of Nonslender Delta Wings written by and published by . This book was released on 2003 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Study of Delta Wing Leading Edge Blowing by : David Yeh
Download or read book Numerical Study of Delta Wing Leading Edge Blowing written by David Yeh and published by . This book was released on 1988 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Prediction of Unsteady Aerodynamics and Control of Delta Wings with Tangential Leading Edge Blowing by : Stanford University. Department of Aeronautics and Astronautics
Download or read book Prediction of Unsteady Aerodynamics and Control of Delta Wings with Tangential Leading Edge Blowing written by Stanford University. Department of Aeronautics and Astronautics and published by . This book was released on 1989 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt:
