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Measurements In The Near Wall Region Of A Relaxing Three Dimensional Low Speed Turbulent Air Boundary Layer
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Book Synopsis Measurements in the Near-Wall Region of a Relaxing Three-Dimensional Low Speed Turbulent Air Boundary Layer by : Kattinger Sheshagiri Hebbar
Download or read book Measurements in the Near-Wall Region of a Relaxing Three-Dimensional Low Speed Turbulent Air Boundary Layer written by Kattinger Sheshagiri Hebbar and published by . This book was released on 1976 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental investigation was conducted at selected locations of the near-wall region of a three-dimensional turbulent air boundary layer relaxing in a nominally zero external pressure gradient behind a transverse hump (in the form of a 30 degree swept, 5-foot chord wing-type model) faired into the side wall of a low speed wind tunnel. Wall shear stresses measured with a flush-mounted hot-film gage and a sublayer fence were in very good agreement with experimental data obtained with two Preston probes. With the upstream unit Reynolds number held constant at 325000/ft approximately one-fourth of the boundary layer thickness adjacent to the wall was surveyed with a single rotated hot-wire probe mounted on a specially designed minimum interference traverse mechanism. The boundary layer (approximately 3.5 in. thick near the first survey station where the length Reynolds number was 5500000) had a maximum crossflow velocity ratio of 0.145 and a maximum crossflow angle of 21.875 degrees close to the wall. The hot-wire data indicated, in agreement with the findings elsewhere, that the apparent dimensionless velocity profiles in the viscous sublayer region are universal and that the wall influence is negligible beyond y(+) =5. The existence of wall similarity in the relaxing flow field was confirmed in the form of a log law based on the resultant mean velocity and resultant friction velocity (obtained from measured skin friction).
Book Synopsis Near-wall Measurements of a Three-dimensional Turbulent Boundary Layer by : Debora Alice Compton
Download or read book Near-wall Measurements of a Three-dimensional Turbulent Boundary Layer written by Debora Alice Compton and published by . This book was released on 1995 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: In order to improve predictions of flow behavior in numerous applications there is a great need to understand the physics of three-dimensional turbulent boundary layers, dominated by near-wall behavior. To that end, an experiment was performed to measure near-wall velocity and Reynolds stress profiles in a pressure-driven three-dimensional turbulent boundary layer. The flow was achieved by placing a 30 deg wedge in a straight duct in a wind tunnel, with-additional pressure gradient control above the test surface. An initially two-dimensional boundary layer (Re approx. equal 4000) was exposed to a strong spanwise pressure gradient. At the furthest downstream measurement locations there was also a fairly strong favorable pressure gradient. Measurements were made using a specially-designed near-wall laser Doppler anemometer (LDA), in addition to conventional methods. The LDA used short focal length optics, a mirror probe suspended in the flow, and side-scatter collection to achieve a nearly spherical measuring volume approximately 35 microns in diameter. Good agreement with previous two-dimensional boundary layer data was achieved. The three-dimensional turbulent boundary layer data presented include mean velocity measurements and Reynolds stresses, all extending well below y(+) = 10, at several profile locations. Terms of the Reynolds stress transport equations are calculated at two profile locations. The mean flow is nearly collateral at the wall. Turbulent kinetic energy is mildly suppressed in the near-wall region and the shear stress components are strongly affected by three-dimensionality. As a result, the ratio of shear stress to turbulent kinetic energy is suppressed throughout most of the boundary layer. The angles of stress and strain are misaligned, except very near the wall (around y(+) = 10) where the angles nearly coincide with the mean flow angle.
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 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Three Dimensional Turbulent Shear Flows by : S. Carmi
Download or read book Three Dimensional Turbulent Shear Flows written by S. Carmi and published by . This book was released on 1982 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Three-dimensional Turbulent Boundary Layers by : O. Sendstad
Download or read book Three-dimensional Turbulent Boundary Layers written by O. Sendstad and published by . This book was released on 1992 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Investigation of a Two and a Three-Dimensional Low Speed Turbulent Boundary Layer by : A. E. Winkelmann
Download or read book An Experimental Investigation of a Two and a Three-Dimensional Low Speed Turbulent Boundary Layer written by A. E. Winkelmann and published by . This book was released on 1976 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental studies of a two and a three-dimensional low speed turbulent boundary layer were conducted on the side wall of the University of Maryland Boundary Layer Wind Tunnel. Preliminary studies in the two-dimensional boundary layer indicated that the flow was nonuniform on the 46 in. wide test wall. The nonuniform boundary layer is characterized by transverse variations in the wall shear stress and is primarily caused by nonuniformities in the inlet damping screens. Over the 15 in. span of a special transverse device, the local skin friction coefficient varied (at discrete locations) + or - 9% about a mean. Transverse variations in the flow velocity, yaw, pitch and turbulence intensity were also measured in the boundary layer at set distances above the wall. Measurements with a pitch probe revealed the presence of a vortex-like flow to exist above the edge of the boundary layer at two locations along the 15 in. traverse line.
Book Synopsis Effect of Distributed Three-dimensional Roughness and Surface Cooling on Boundary-layer Transition and Lateral Spread of Turbulence at Supersonic Speeds by : Albert L. Braslow
Download or read book Effect of Distributed Three-dimensional Roughness and Surface Cooling on Boundary-layer Transition and Lateral Spread of Turbulence at Supersonic Speeds written by Albert L. Braslow and published by . This book was released on 1959 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Near Wall Mechanics of Three-dimensional Turbulent Boundary Layers by : Olav Sendstad
Download or read book The Near Wall Mechanics of Three-dimensional Turbulent Boundary Layers written by Olav Sendstad and published by . This book was released on 1992 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Advances in Three-dimensional Turbulent Boundary Layers with Emphasis on the Wall-layer Regions by : Stanford University. Thermosciences Division. Thermosciences Division
Download or read book Advances in Three-dimensional Turbulent Boundary Layers with Emphasis on the Wall-layer Regions written by Stanford University. Thermosciences Division. Thermosciences Division and published by . This book was released on 1994 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Investigation of the Near-wall Region of a Three-dimensional Incompressible Turbulent Boundary Layer Relaxing in a Zero Pressure Gradient by : Kattingeri Sheshagiri Hebbar
Download or read book An Experimental Investigation of the Near-wall Region of a Three-dimensional Incompressible Turbulent Boundary Layer Relaxing in a Zero Pressure Gradient written by Kattingeri Sheshagiri Hebbar and published by . This book was released on 1976 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Studies in Three-dimensional Turbulent Boundary Layers by : J. P. Johnston
Download or read book Experimental Studies in Three-dimensional Turbulent Boundary Layers written by J. P. Johnston and published by . This book was released on 1976 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: The various methods for measurement of the six components of the turbulence stress tensor are reviewed, and some of the data on the turbulent shear stress vector are presented to demonstrate the validity of current ideas for.
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1970 with total page 796 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1990 with total page 1312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Annual Index: Keyword A-L by :
Download or read book Government Reports Annual Index: Keyword A-L written by and published by . This book was released on 1976 with total page 1052 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Studies of a Two and a Three-dimensional Low Speed Turbulent Boundary Layer by : Allen Edward Winkelmann
Download or read book Experimental Studies of a Two and a Three-dimensional Low Speed Turbulent Boundary Layer written by Allen Edward Winkelmann and published by . This book was released on 1976 with total page 700 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Low-speed Three-dimensional Turbulent Boundary-layer Data by : L. F. East
Download or read book Low-speed Three-dimensional Turbulent Boundary-layer Data written by L. F. East and published by . This book was released on 1969 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Low Speed Three Dimensional Turbulent Boundary Layer Data by : L. F. East
Download or read book Low Speed Three Dimensional Turbulent Boundary Layer Data written by L. F. East and published by . This book was released on 1969 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
