Download or read book Effect of Roughness on Three Dimensional Turbulent Boundary Layer written by P. A. Krogstad and published by . This book was released on 1982 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The paper describes a three-dimensional boundary-layer experiment on a rough surface. The data obtained are compared to a reference experiment having the same geometry and flow conditions but with a smooth surface. The boundary layer date are compared using scaling criteria developed from two-dimensional flows. It is found that the results, in terms of scaled variables, agree well in regions where pressure gradients are the dominant cause of three-dimensionality. In regions where shear stresses are more important, significant deviations in profile characteristics appear. A possible interpretation is that the degree of anisotropy is greater in three-dimensional rough boundary-layer flows than in the corresponding smooth-wall case. (Author).
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 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Three dimensional Turbulent Boundary layer Flow on Roughness Strip of Finite Width written by Walter H. Edling and published by . This book was released on 1976 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Boundary Layer Transition at Supersonic Speeds written by E. R. Van Driest and published by . This book was released on 1961 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiments carried out in the 12-inch supersonic wind tunnel to investigate the effect of three dimensional roughness elements (spheres) on boundary-layer transition on a 10-degree (apex angle) cone without heat transfer are described. The local Mach number for these tests was 2.71. The data show clearly that the minimum (effective) size of trip required to bring transition to its lowest Reynolds number varies power of the distance from the apex of the cone to the trip. Use of available data at other Mach numbers indicates that the Mach number influence for effective tripping is taken into account by a simple expression. Some remarks concerning the roughness variation for transition on a blunt body are made. Finally, a general criterion is introduced which gives insight to the transition phenomenon and anticipates effects of external and internal disturbances, Mach number transfer.
Download or read book Investigation of Effects of Roughness Surface Cooling and Shock Impingement on Boundary layer Transition on a Two dimensional Wing written by K. R. Czarnecki and published by . This book was released on 1960 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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:
Download or read book Three dimensional Turbulent Boundary Layer Flow on Roughness Strip of Finite Width written by Walter H. Edling and published by . This book was released on 1974 with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt: Described are the results of an experimental study of a well developed, turbulent boundary layer on a smooth, flat surface encountering an area of much rougher surface. The roughened area is a strip with its length extending in the direction of the mean flow but of finite width in the surface direction normal to the flow. The resulting three-dimensional flow is found to differ significantly from previously studied cases involving step changes in roughness of infinite extent in the direction normal to the flow. Extensive experiments are reported in a wind tunnel having a length of nearly 100 ft with a boundary layer thickness of the order of 18-20 in. Pitot tube and hot-wire anemometer measurements were made of mean velocity and Reynolds stress quantities throughout the flow field. Secondary flow components were measured by a new x-wire technique. (Modified author abstract).
Download or read book Drag Due to Two dimensional Surface Roughness in a Turbulent Boundary Layer Mach 3 with and Without Heat Transfer written by William J. Monta and published by . This book was released on 1968 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Unit Reynolds Number Nose Bluntness and Roughness on Boundary Layer Transition written by J. Leith Potter and published by . This book was released on 1960 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: Condtions encountered in the high Mach number flow regime are show to profoundly affect the longitudinal extent of the boundary layer from beginning to end of transition, the distribution of fluctuation energy in the laminar layer, and effectiveness of surface roughness in promoting transition. A critical layer of intense local energy fluctuations was found at all Mach numbers studied. The existence of such a critical layer is predicted by stability theory. Hot-wire surveys of the laminar, transitional, and turbulent boundary layers are presented to illustrate the critical layer in laminar flow and subsequent development into the transition process. The relation between boundary layer transition on flat plates and cones in supersonic flow is explored and a process for correcting data to account for leading edge bluntness is devised. On the basis of a comparison of data corrected for the effects of leading edge geometry, it is shown that the Reynolds umber of transition on a cone is three times that on a vanishingly thin flate plate. Close agreement between data from various wind tunnels is demonstrated. Study of the effect of finite leading edges yields significant illustrations of the influence of unit Reynolds number on boundary layer transition. A correlation of the effects of surface roughness on transition is achieved. This treatment includes two- and three-dimensional roughness in both subsonic and supersonic streams. At this time only zero pressure gradients have been studied. The entire range of movement of transition from its position with no roughness up to its reaching the roughness element is describable by the procedure give. Examples of application of the correlation results show excellent agreement with experimental data from a variety of sources. Implications concerning tripping hypersonic boundary layers are discussed.
Download or read book Roughness Effects on Boundary layer Transition for Blunt leading edge Plates at Mach 6 written by Paul F. Holloway and published by . This book was released on 1966 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Some Effects of Sparsely Distributed Three dimensional Roughness Elements on Two dimensional Turbulent Boundary Layers written by Jacob George and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Numerical Study of a Three dimensional Turbulent Boundary Layer written by Parviz Moin and published by . This book was released on 1990 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Study of a Three dimensional Shear driven Turbulent Boundary Layer with Streamwise Adverse Pressure Gradient written by David Michael Driver and published by . This book was released on 1989 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Free stream Turbulence and Three dimensional Roughness on Boundary Layer Transition written by Santhosh B. Mamidala and published by . This book was released on 2022 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Some Reynolds Number Effects on a Three dimensional Turbulent Boundary Layer written by M. Semih-Olcmen and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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:
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:
