Download or read book Effect of Vortex Separation on Lifting Bodies of Elliptic Cross Section written by Leon H. Schindel and published by . This book was released on 1965 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effect of Vortex Separation on Lifting Bodies of Elliptic Gross Section written by Leon H. Schindel and published by . This book was released on 1965 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: The lift on slender bodies at high angle of attack is strongly influenced by the separation of a pair of vortices from the lee side. Of the various possible methods for taking account of this vortex separation, that proposed by Bryson seems to incorporate the main features of the flow in the simplest mathematical form. In this model, the separated vortices are joined to the body by straight feeding sheets. Bryson gives solutions for the vortex strength and position as a function of time or distance along the body and calculates the resulting body normal force for circular cones and cylinders. These solutions are extended here to cambered bodies of elliptic cross section having arbitrary nose contour. Calculation of the development of the separated vortices requires specification of the angular position around the body at which the feeding sheet departs. The position of this separation line is determined here from a correlation of experimental results. An analytic procedure is also described, but its accuracy is considered to be inadequate. In order to complete the theory, the initial growth of the vortices as they first leave the surface must also be prescribed. Vorticity is assumed to accumulate within the boundary layer until it separates upon reaching a certain finite strength which depends on whether the boundary layer is laminar or turbulent at separation.
Download or read book Vortex Separation on Slender Bodies of Elliptic Cross Section written by Leon H. Schindel and published by . This book was released on 1967 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: The lift on slender bodies at high angle of attack is strongly influenced by the separation of a pair of vortices from the lee side. An analytical model of the vortex separation was developed which predicts the vortex development and the consequent nonlinear lift distribution on bodies of elliptic cross section and very general longitudinal contour. The report describes comparisons of the theory with subsonic wind tunnel tests on families of body shapes. Nose contours included pointed ogives, blunt ogives, and hemispheres. Body fineness ratios from 4 to 15 were tested and cross sections from circular to 3.5:1 ellipses. In addition the elliptic bodies were tested with major axes in and normal to the pitch plane. All cases were run with and without boundary layer trips at angle of attack up to 28 degrees. Vortex trajectories, obtained from the behavior of tuft grids, were in general agreement with theory. Normal force and pitching moment predictions also agreed with experiment until the theory failed at high angles of attack. Limitations on the validity of the analysis were thus experimentally established. The predicted locations of separation were generally quite far around to leeward from the positions measured by a China clay technique. (Author).
Download or read book The Aerodynamics of Delta Wings of Elliptical Cross section with Separated Flow written by Joint Institute for Aeronautics and Acoustics. Joint Institute for Aeronautics and Acoustics and published by . This book was released on 1985 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Store Separation written by Bertha M. Ryan and published by . This book was released on 1973 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Report written by and published by . This book was released on 1977 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Selective Bibliography on High angle of attack Aerodynamics of Aircraft and Aircraft Components at Subsonic Speeds written by Henry W. Woolard and published by . This book was released on 1974 with total page 40 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 1968 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Boundary Layer Effects written by Anthony W. Fiore and published by . This book was released on 1978 with total page 962 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 1975 the U.S. Air Force and the Federal Republic of Germany signed a Data Exchange Agreement numbered AF-75-G-7440 entitled 'Viscous and Interacting Flow Fields.' The purpose was to exchange data in the area of boundary layer research. It includes both experimental and theoretical boundary layer research at speeds from subsonic to hypersonic Mach numbers in the presence of laminar, transitional, and turbulent boundary layers. The main effort in recent years has been on turbulent boundary layers, both attached and separated in the presence of such parameters as pressure gradients, wall temperature, surface roughness, etc. In the United States the research was conducted in various Department of Defense, NASA, aircraft corporations, and various university laboratories. In the Federal Republic of Germany it was carried out within the various DFVLR, industrial, and university research centers.
Download or read book Separated Flows and Jets written by Victor V. Kozlov and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 907 pages. Available in PDF, EPUB and Kindle. Book excerpt: Separated flows and jets are closely linked in a variety of applications. They are of great importance in various fields of fluid mechanics including vehicle efficiency, technical branches concerned with gas/liquid flows, atmospheric effects on various constructions, etc. Knowledge of the physics of separated flows and jets and the development of reliable control techniques are prerequisite for future progress in the field. These aspects were in focus during the IUTAM-Symposium which was held in Novosibirsk, 9-13 July, 1990. This volume contains a selection of papers presenting recent results of theoretical and numerical studies as well as experimental work on separated flows and jets. The topics include sub- and supersonic, laminar and turbulent separation as well as organized structures in separated flows and jets. The reader will find here the state of the art and major trends for research in this field of aero-hydrodynamics.
Download or read book Government wide Index to Federal Research Development Reports written by and published by . This book was released on 1966 with total page 1576 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Annual Report of the National Advisory Committee for Aeronautics written by United States. National Advisory Committee for Aeronautics and published by . This book was released on with total page 694 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Contractor Report written by and published by . This book was released on 1979 with total page 834 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Prediction of Normal Force Pitching Moment and Yawing Force on Bodies of Revolution at Angles of Attack Up to 50 Degrees Using a Concentrated Vortex Flow field Model written by Andrew B. Wardlaw (Jr.) and published by . This book was released on 1973 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: A method initially proposed by Bryson is extended to include asymmetric shedding. This method employs the impulsive flow analogy, and models each wake vortex using a single-point vortex. Free parameters inherent in the problem formulation are determined empirically. Normal force, pitching moment and yawing force coefficients are predicted for slender bodies with a nose fineness ratio greater than four and at a Mach number less than 0.9. (Modified author abstract).
Download or read book Publications and Theses for the Year Ending June 30 written by Massachusetts Institute of Technology and published by . This book was released on 1965 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book List of Periodical Publications Books and Reviews by Members of the Staff and Theses Presented for Doctors Degrees written by Massachusetts Institute of Technology and published by . This book was released on 1965 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
