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Author : Stanley F. Birch
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book The Axisymmetric Turbulent Wake written by Stanley F. Birch and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : James Mackson III. McMichael
Publisher :
ISBN 13 :
Total Pages : 388 pages
Book Rating : 4.:/5 (516 download)
Download or read book A Study of the Axisymmetric Turbulent Wake Generated by Co-flowing Incompressible Streams written by James Mackson III. McMichael and published by . This book was released on 1971 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Peter B. V. Johansson
Publisher :
ISBN 13 : 9789172911789
Total Pages : 22 pages
Book Rating : 4.9/5 (117 download)
Download or read book The Axisymmetric Turbulent Wake written by Peter B. V. Johansson and published by . This book was released on 2002 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Martin Gardner Bowin
Publisher :
ISBN 13 :
Total Pages : 158 pages
Book Rating : 4.:/5 (63 download)
Download or read book An Experimental Determination of the Effect of the Axisymmetric Turbulent Wake on the Pressure Distribution on a Sphere written by Martin Gardner Bowin and published by . This book was released on 1971 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: "A study of the effect of the turbulent wake of a water drop on the motion of a smaller droplet is essential in order to gain an understanding of the behavior associated with the collision coalescence phenomena. The use of spheres of macroscopic size proves to be a valuable method in observing these effects. This experimental investigation centers on (1) a check on the validity of the instrumented sphere as a device to measure normal static pressure, and (2) the study of the effect of the turbulent wake of the test model sphere upon the instrumented sphere. Measurements were made in a subsonic wind tunnel with a test section of 20 x 20 inch cross section and 42 inches length. Mean velocity profiles indicate that the boundary layer is thin and turbulence measurements show the tunnel to have low turbulence. The experimental method is proven valid by measuring the pressure distribution on the sphere surface with the sphere in the free stream and comparing the results to those of other experimentalists and to a viscous analytical solution. Normal pressure is then measured using the instrumented sphere in the near wake of the test model at various locations. The resultant forces are calculated using graphical type integration The results show the axial (Z direction) component of force to range from a lower value at the wake centerline to a value equal to that of the free stream drag as the sphere is traversed out of the wake. This gradient tends to become smaller the further downstream the measurements are taken. The trends of the axial (Z direction) component of force are similar to those of the mean velocity profile in the wake of the test model. The transverse force components (X and Y directions) are zero on the centerline and increase to a maximum just to one side of the centerline and then diminish as the wake boundary is crossed. As with the axial (Z direction) component, the transverse components (X and Y directions) are less amplified the further downstream the measurements are taken"--Abstract, pages ii-iii.
Author : A. Demetriades
Publisher :
ISBN 13 :
Total Pages : 92 pages
Book Rating : 4.:/5 (227 download)
Download or read book Mean Flow Measurements in an Axisymmetric Compressible Turbulent Wake written by A. Demetriades and published by . This book was released on 1967 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: The mean flow field of the axisymmetric turbulent wake shed by a very slender body at Mach 3 has been mapped with the aid of the pitot and static pressure probes and the hot-wire anemometer. The experimental geometry was chosen so that no inviscid wake existed, and the measurements were carried out to about 100 diameters downstream of the base. The axial variation of the velocity and temperature defects appears to obey classical decay laws following a relaxation distance of at least 40 diameters from the transition region. By contrast, the radial profiles of these properties relax quickly to a self-preserving form; both the temperature and the velocity radial variations fit single-parameter Gaussian distributions quite well. The proper radial similarity variable is the radius divided by the transverse wake scale; equally good agreement obtains for a Howarth-Dorodnitzyn-transformed radius, although this issue is still unsettled because of the low Mach number used. The turbulent Reynolds and Prandtl numbers computed indirectly from the data agree well with similar results from low-speed turbulent flows. (Author).
Author : Stephen B. Pope
Publisher : Cambridge University Press
ISBN 13 : 9780521598866
Total Pages : 810 pages
Book Rating : 4.5/5 (988 download)
Download or read book Turbulent Flows written by Stephen B. Pope and published by Cambridge University Press. This book was released on 2000-08-10 with total page 810 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a graduate text on turbulent flows, an important topic in fluid dynamics. It is up-to-date, comprehensive, designed for teaching, and is based on a course taught by the author at Cornell University for a number of years. The book consists of two parts followed by a number of appendices. Part I provides a general introduction to turbulent flows, how they behave, how they can be described quantitatively, and the fundamental physical processes involved. Part II is concerned with different approaches for modelling or simulating turbulent flows. The necessary mathematical techniques are presented in the appendices. This book is primarily intended as a graduate level text in turbulent flows for engineering students, but it may also be valuable to students in applied mathematics, physics, oceanography and atmospheric sciences, as well as researchers and practising engineers.
Author : Asadollah Allahdadi
Publisher :
ISBN 13 :
Total Pages : 172 pages
Book Rating : 4.:/5 (294 download)
Download or read book Final Period of Decay of an Axisymmetric Turbulent Velocity and Temperature Wake written by Asadollah Allahdadi and published by . This book was released on 1976 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : R. Ermshaus
Publisher :
ISBN 13 :
Total Pages : 76 pages
Book Rating : 4.:/5 (227 download)
Download or read book Typical Features of Turbulent Wake Flows written by R. Ermshaus and published by . This book was released on 1972 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plane and axisymmetric wake flows were studied experimentally in a wind tunnel. The results show that each type of wake has its own distinct characteristics. The nature of the initial flow affects the subsequent history of the evolving flow even far downstream. The development of turbulent wakes can be represented in a formal way using certain similarity hypotheses in conjunction with the basic governing equations. An important factor is the progressive change proceeding downstream in the ratio of the turbulent friction to the square of the maximum velocity deficit. A common power law, representing the lateral growth of the wake, was found to fit the experimentally determined data for both the plane and axisymmetric wakes. (Author).
Author : Richard Alan Merz
Publisher :
ISBN 13 :
Total Pages : 318 pages
Book Rating : 4.:/5 (381 download)
Download or read book The Turbulent Near-wake of an Axisymmetric Blunt Based Body at Subsonic Speeds written by Richard Alan Merz and published by . This book was released on 1975 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ned H. C. Hwang
Publisher :
ISBN 13 :
Total Pages : 354 pages
Book Rating : 4.:/5 (468 download)
Download or read book Wake Turbulence Far Downstream from an Axisymmetric Body written by Ned H. C. Hwang and published by . This book was released on 1966 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : W. R. Sieling
Publisher :
ISBN 13 :
Total Pages : 110 pages
Book Rating : 4.:/5 (11 download)
Download or read book Axisymmetric Turbulent Near-wake Studies at Mach 4 written by W. R. Sieling and published by . This book was released on 1968 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : C. C. Chieng
Publisher :
ISBN 13 :
Total Pages : 224 pages
Book Rating : 4.:/5 (119 download)
Download or read book Investigation of the Turbulent Properties of the Wake Behind Self-propelled, Axisymmetric Bodies written by C. C. Chieng and published by . This book was released on 1974 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: The turbulent wakes behind a streamlined drag body, a jet propelled body and a propeller-driven body are studied experimentally in the VPI Stability Wind Tunnel at a nominal free stream velocity of 206 ft/sec. The turbulence properties investigated are axial, radial, and tangential turbulence intensities, and radial and tangential shear stresses.
Author : Virendrakumar Chaturbhai Patel
Publisher :
ISBN 13 :
Total Pages : 150 pages
Book Rating : 4.:/5 (31 download)
Download or read book Thick Axisymmetric Turbulent Boundary Layer and Near Wake of a Low-drag Body of Revolution written by Virendrakumar Chaturbhai Patel and published by . This book was released on 1977 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: Detailed measurements of pressure distributions, mean velocity profiles and Reynolds stresses were made in the thick, axisymmetric boundary layer and the near wake of a low-drag body of revolution. The data are presented in graphical as well as tabular form for convenience in later analysis. These measurements shed some light on the joint influence of transverse and longitudinal surface curvatures and pressure gradients on the boundary-layer development and on the manner in which an axisymmetric boundary layer becomes a fully-developed wake. Apart from giving a complete set of data on such an important flow configuration, the measurements should provide a fairly rigorous test case for some of the recent turbulence closure models which claim a level of generality not achieved by the older phenomenological models. By inclusion of recently proposed modifications to account for the effects of the extra rates of strain on the turbulence length scale arising from longitudinal and transverse surface curvatures, it is shown that the boundary layer in the tail region of a body of revolution is dominated by the extra strain rates and that more research is needed to account for them properly even in the most recent calculation procedures.
Author : L. N. Uhkhanova
Publisher :
ISBN 13 :
Total Pages : 19 pages
Book Rating : 4.:/5 (227 download)
Download or read book Characteristics of a Turbulent Wake Under Gradient Flow Conditions written by L. N. Uhkhanova and published by . This book was released on 1968 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results are given of experimental studies of turbulent wakes in the plane and axisymmetric cases under positive and negative longitudinal pressure gradients and an approximate method of calculating such wakes is discussed. A positive longitudinal pressure gradient promotes more rapid decay of a turbulent wake than in the zero gradient case, whereas the opposite is true for a negative pressure gradient. (Author).
Author : Gopal Krishna Mehta
Publisher :
ISBN 13 :
Total Pages : 202 pages
Book Rating : 4.:/5 (321 download)
Download or read book A Theory of the Supersonic Turbulent Axisymmetric Near Wake Behind Bluff-base Bodies written by Gopal Krishna Mehta and published by . This book was released on 1977 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Mathieu Grandemange
Publisher :
ISBN 13 :
Total Pages : 228 pages
Book Rating : 4.:/5 (872 download)
Download or read book Analysis and Control of Three-dimensional Turbulent Wakes written by Mathieu Grandemange and published by . This book was released on 2013 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental study of the turbulent wake past different geometries is performed by increasing the complexity from axisymmetric bodies to road vehicles. Whatever the geometry is, two kinds of coherent wake motions are likely to be observed. First, at timescales of the order of 5D/U, D and U being the characteristic size and velocity of the flow respectively, the wake may generate periodic oscillations. These coherent motions are usually associated with the interaction of two facing shear layers of opposite vorticity. As the corresponding frequencies rely at first order on the distance between the shear layers, two distinct frequencies are reported when the afterbody has a cross-flow aspect ratio different than 1. These unsteady global modes seem to weaken when the Reynolds number and the complexity of the geometry increase. The second type of coherent motions corresponds to the development of stationary cross-flow instabilities. They are linked to the symmetry breaking modes observed in laminar regimes and their domains of appearance are defined from geometry considerations in the cases of parallelepiped bodies in ground proximity. These instabilities are responsible for strong asymmetries in the instantaneous flow and may generate bistable dynamics with a characteristic time scale of the order of 1000D/U. The study of these phenomena, combined with sensitivity analyses to small perturbations, places the diminution of the cross-flow asymmetries of the instantaneous wake as a relevant strategy for drag reduction. In particular, it is found that both local and global pressure gradients on the sides of the body are source of streamwise vortices increasing the drag. Parabolic dependences between the drag and the cross-flow forces are reported suggesting similarities with the mechanisms of induced drag that are well-known in aeronautics. Consequently, as they often generate significant wake asymmetries, the development of the cross-flow instabilities is identified as a drag contributor. On the contrary, the part of the drag related to the periodic global modes seems to be negligible especially for complex geometries at high Reynolds number.
Author : Lee James Hesler
Publisher :
ISBN 13 :
Total Pages : 374 pages
Book Rating : 4.:/5 (43 download)
Download or read book A unified analysis of planar and axisymmetric turbulent near wakes in supersonic flow written by Lee James Hesler and published by . This book was released on 1972 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt:
