Flow Visualization Of Three Dimensional Boundary Layer Separation On Bodies Of Revolution At Incidence PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Flow Visualization Of Three Dimensional Boundary Layer Separation On Bodies Of Revolution At Incidence PDF full book. Access full book title Flow Visualization Of Three Dimensional Boundary Layer Separation On Bodies Of Revolution At Incidence.
| Author | : Taeyoung Han |
| Publisher | : |
| Total Pages | : 86 |
| Release | : 1977 |
| Genre | : Boundary layer |
| ISBN | : |
Download Flow-visualization of Three-dimensional Boundary-layer Separation on Bodies of Revolution at Incidence Book in PDF, ePub and Kindle
Surface streamline patterns on three bodies of revolution, namely a spheroid, a low-drag body and a hemisphere-hemispheroid combination body, have been examined at several angles of attack. Most of the tests were performed at low Reynolds numbers in a hydraulic flume using colored dye to make the surface flow visible. A limited number of experiments was also carried out in a wind tunnel, using wool tufts, to study the influence of Reynolds number and turbulent separation. The study has verified some of the important qualitative features of three-dimensional separation criteria proposed earlier by Maskell, Lighthill, Wang and others. The observed locations of laminar separation lines on a spheroid at various incidences have been compared with the numerical boundary-layer solutions of Wang, and it is suggested that the quantitative differences may be attributed to the significant viscous-inviscid interaction, especially at large incidences. (Author).
| Author | : V. C. Patel |
| Publisher | : |
| Total Pages | : 13 |
| Release | : 1978 |
| Genre | : |
| ISBN | : |
Download Three-Dimensional Boundary Layers on Bodies of Revolution at Incidence Book in PDF, ePub and Kindle
This report summarizes the objectives and accomplishments of an experimental and theoretical investigation of the boundary layer development on bodies of revolution at incidence. The results of the flow visualization studies in laminar flow, detailed measurements in a turbulent boundary layer, and calculations of laminar as well as turbulent boundary layers using two different numerical schemes and turbulence models are reviewed to emphasize the important characteristics of separation in three dimensions.
| Author | : Taeyoung Han |
| Publisher | : |
| Total Pages | : 69 |
| Release | : 1977 |
| Genre | : |
| ISBN | : |
Download Flow Visualisation of Three Dimensional Boundray Layer Separation on Bodies of Revolution at Incidence Book in PDF, ePub and Kindle
| Author | : H. U. Meier |
| Publisher | : |
| Total Pages | : 9 |
| Release | : 1982 |
| Genre | : |
| ISBN | : |
Download Development of Boundary Layers and Separation Patterns on a Body of Revolution at Incidence Book in PDF, ePub and Kindle
Detailed measurements in three-dimensional boundary layers and separated flow fields, developing on a prolate spheroid, are presented. The discussion is concentrated on the possible topological structure of separation patterns resulting from laminar or turbulent boundary layer flows. A hypothesis about the transition from an unsteady two-dimensional axisymmetric flow separation into a steady three-dimensional vortex flow is established. (Author).
| Author | : |
| Publisher | : |
| Total Pages | : 18 |
| Release | : 1982 |
| Genre | : |
| ISBN | : |
Download Topological Analysis of Computed Three-dimensional Viscous Flow Fields Book in PDF, ePub and Kindle
| Author | : Tuncer Cebeci |
| Publisher | : |
| Total Pages | : 66 |
| Release | : 1980 |
| Genre | : |
| ISBN | : |
Download Studies on Three-Dimensional Boundary Layers on Bodies of Revolution. II. Three-Dimensional Laminar Boundary Layers and the OK of Accessibility Book in PDF, ePub and Kindle
An investigation is carried out into the structure of the laminar boundary layer originating from the forward stagnation point of a prolate spheroid at incidence in a uniform stream, assuming that the external velocity distribution is given by attached potential theory. The principal new results of the study are: (1) A new transformation of the body coordinates is devised which facilitates the computation of the solution near the nose, (2) Two variations of the standard box method of solving the equations are devised to enable solutions to be computed in regions of cross-flow reversal, (3) Whereas in two dimensional flows the effect of the boundary layer approaching separation on the external flow may be represented by a blowing velocity, in the present study we find that this is only true near the windward line of symmetry, (4) The boundary layer over the whole of the spheroid cannot be computed in an integration from the forward stagnation point. (5) For alpha> or = 15 deg the accessible region on the leeward side of the ok is largely determined by the external streamline through the ok.
| Author | : K. C. Wang |
| Publisher | : |
| Total Pages | : 45 |
| Release | : 1973 |
| Genre | : |
| ISBN | : |
Download Three-Dimensional Laminar Boundary Layer Over Body of Revolution at Incidence. Part VII. The Extremely High Incidence Case Book in PDF, ePub and Kindle
The report presents results of exact, full three-dimensional solutions of the incompressible laminar boundary layer over a prolate spheroid at an extremely high incidence. In contrast to the high incidence (30 degrees) case recently reported, this extremely high incidence (45 degrees) problem is characterized by features reflecting the predominance of the circumferential flow over the meridional flow and, more importantly, by a closed, rather than an open, separation pattern. These features include much larger circumferential skin friction than meridional skin friction and that the limiting streamlines are more closely oriented along the parallels. (Author).
| Author | : V. C. Patel |
| Publisher | : |
| Total Pages | : 32 |
| Release | : 1982 |
| Genre | : Turbulent boundary layer |
| ISBN | : |
Download Calculation of Three-dimensional Boundary Layers on Bodies at Incidence Book in PDF, ePub and Kindle
Three-dimensional thin boundary-layer equations for laminar and turbulent flows are solved by two different numerical schemes. The methods are applied to the flow over bodies of revolution at incidence and the results are compared with the available experimental data in order to study the range of validity of the classical boundary-layer approximations in regions of increasing circumferential gradients and flow reversal associated with the early stages of a free-vortex type of separation. Comparison with the DFVLR 6:1 spheroid data of Meier et al and the 4:1 combination-body data of Ramaprian, Patel and Choi indicate that the methods perform well in regions where the boundary layer remains thin but the predictions deteriorate as the boundary layer thickens. The results point out the need for the development of methods of handle thick boundary layers and viscous-inviscid interactions. (Author).
| Author | : V. C. Patel |
| Publisher | : |
| Total Pages | : 29 |
| Release | : 1983 |
| Genre | : |
| ISBN | : |
Download Three-Dimensional Turbulent Boundary Layer on a Body of Revolution at Incidence Book in PDF, ePub and Kindle
An experimental and theoretical study of three-dimensional boundary layers on bodies of revolution at incidence was conducted during the period May 1980-July 1983. This final report summarizes the technical accomplishments. Reference is made to previous reports and papers resulting from the study and some recent experimental results on the boundary layer in the plane of symmetry and the vortex formation region are presented. One of the primary objectives of this study was to develop instrumentation for the measurement of the mean flow and the Reynolds stresses in three-dimensional turbulent boundary layers, and to use these to supplement the mean-flow measurements made earlier by Ramaprian, Patel and Choi on the combination body at an incidence of 15 degrees.
| Author | : Walter B. Sturek |
| Publisher | : |
| Total Pages | : 38 |
| Release | : 1975 |
| Genre | : Body of revolution |
| ISBN | : |
Download Preliminary Surveys of the Three Dimensional Boundary Layer on a Yawed, Spinning Body of Revolution Book in PDF, ePub and Kindle
Experimental measurements of the three dimensional boundary layer on a yawed, spinning tangent-ogive-cylinder model in supersonic flow are reported. The measurements were made using a flattened total head probe at one axial station near the base of the model for 10 azimuthal stations about the circumference. The test conditions were: M = 3, angle of attack = 4 deg, omega = 0 and 10,000 RPM. The trends observed in comparing measurements with and without the model spinning were: (1) the boundary layer is more thick and less full where surface spin opposes the crossflow velocity; and (2) the boundary layer is less thick and more full where surface spin is in the same direction as the crossflow velocity. (Author).
