Download or read book Effect of Uniformly Distributed Roughness on Turbulent Skin friction Drag at Supersonic Speeds written by Jr. Frank E. Goddard and published by . This book was released on 1959 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Uniformly Distributed Roughness on Turbulent Skin Friction Drag at Supersonic Speeds written by Frank E. Goddard and published by . This book was released on 1957 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Experimental Investigation of the Effects of Several Types of Surface Roughness on Turbulent Boundary Layer Characteristics at Supersonic Speeds written by Felix W. Fenter and published by . This book was released on 1953 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: A theory is described which can be used to predict accurately the skin friction drag of surfaces with uniform grain-type roughness. The roughness does not necessarily have to extend to the leading edge of the surface for an accurate calculation to be made. Uniform surface roughness composed of spherical beads does not affect the boundary layer in a manner significantly different from grain-type roughness, provided that the grains and the spheres are bonded to the surface in a similar manner. Consequently, the theory accurately predicts the effects of spherical roughness elements on skin friction under these conditions. The effect of a given type of roughness on turbulent boundary layer characteristics is strongly dependent upon the density of distribution of the roughness elements. The effect of maximum density V-grooves on turbulent boundary layer characteristics is dependent upon the sweepback angle. The effect of increasing sweepback is to reduce the skin friction drag. (Author).
Download or read book The Problem of Roughness Drag at Supersonic Speeds written by K. R. Czarnecki and published by . This book was released on 1966 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Flight Investigation of the Effect of Distributed Roughness on Skin Drag of a Full scale Airplane written by Edwin J. Saltzman and published by . This book was released on 1959 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Explorations in Automatic Thesaurus Discovery written by Gregory Grefenstette and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 313 pages. Available in PDF, EPUB and Kindle. Book excerpt: Explorations in Automatic Thesaurus Discovery presents an automated method for creating a first-draft thesaurus from raw text. It describes natural processing steps of tokenization, surface syntactic analysis, and syntactic attribute extraction. From these attributes, word and term similarity is calculated and a thesaurus is created showing important common terms and their relation to each other, common verb--noun pairings, common expressions, and word family members. The techniques are tested on twenty different corpora ranging from baseball newsgroups, assassination archives, medical X-ray reports, abstracts on AIDS, to encyclopedia articles on animals, even on the text of the book itself. The corpora range from 40,000 to 6 million characters of text, and results are presented for each in the Appendix. The methods described in the book have undergone extensive evaluation. Their time and space complexity are shown to be modest. The results are shown to converge to a stable state as the corpus grows. The similarities calculated are compared to those produced by psychological testing. A method of evaluation using Artificial Synonyms is tested. Gold Standards evaluation show that techniques significantly outperform non-linguistic-based techniques for the most important words in corpora. Explorations in Automatic Thesaurus Discovery includes applications to the fields of information retrieval using established testbeds, existing thesaural enrichment, semantic analysis. Also included are applications showing how to create, implement, and test a first-draft thesaurus.
Download or read book NASA Technical Note written by and published by . This book was released on 1969 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Surface Emittance on Turbulent Skin Friction at Supersonic and Low Hypersonic Speeds written by Jerry M. Allen and published by . This book was released on 1965 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search of available literature indicates that the radiative properties of supersonic aircraft materials depend heavily upon the metal chosen for the aircraft skin and the degree of oxidation of the surface. A calculative study has been made to determine the effect of emittance upon wall temperature and skin friction over a range of supersonic and low hypersonic flight conditions. Calculations were made for Mach numbers up to 9, altitudes up to 80 000 feet, and vehicle lengths up to 200 feet. The results indicate that the skin-friction drag of a supersonic aircraft increases with increased surface emittance. Emittance increases with surface oxidation. Thus, for a new supersonic aircraft with skin made of a metal with low radiative properties in the polished, unoxidized state, the skin-friction drag will increase with time until the surface becomes stably oxidized. This effect of emittance on skin friction increases with Mach number and becomes substantial above Mach numbers of about 2.5. Hence, for specified flight conditions, the level of skin-friction drag at which the vehicle operates depends upon the m tal used for the skin of the aircraft and the degree of oxidation of the metal.
Download or read book Compressible Turbulent Skin Friction on Rough and Rough wavy Walls in Adiabatic Flow written by Daniel C. Reda and published by . This book was released on 1974 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental program was conducted to investigate effects of roughness, and roughness superimposed on single and/or multiple, shallow, periodic waveforms, on turbulent boundary-layer skin friction and velocity profile, in compressible, adiabatic flow. Test conditions were Mach number = 2.9 and Reynolds number/ft = 2 million to 8 million. The planar models included smooth, sand-grain, machined and molded surface finishes. Direct measurements of surface shear and Pitot/recovery temperature profiles were obtained. (Modified author abstract).
Download or read book Handbook of Supersonic Aerodynamics written by R. E. Wilson and published by . This book was released on 1966 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Handbook of Supersonic Aerodynamics written by Johns Hopkins University. Applied Physics Laboratory, Silver Spring, Md and published by . This book was released on 1966 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Outboard Thickened and Blunted Leading Edges on the Wave Drag of a 45 Swept wing and Body Combination written by George H. Holdaway and published by . This book was released on 1959 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Handbook of Supersonic Aerodynamics written by Johns Hopkins University. Applied Physics Laboratory and published by . This book was released on 1966 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physical and Computational Aspects of Convective Heat Transfer written by Tuncer Cebeci and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 497 pages. Available in PDF, EPUB and Kindle. Book excerpt: From the reviews: "The book has a broad and general coverage of both the mathematics and the numerical methods well suited for graduate students." Applied Mechanics Reviews #1 "This is a very well written book. The topics are developed with separate headings making the matter easily understandable. Computer programs are also included for many problems together with a separate chapter dealing with the application of computer programs to heat transfer problems. This enhances the utility of the book." Zentralblatt für Mathematik #1
Download or read book Analysis of Turbulent Flows with Computer Programs written by Tuncer Cebeci and published by Butterworth-Heinemann. This book was released on 2013-02-26 with total page 465 pages. Available in PDF, EPUB and Kindle. Book excerpt: Analysis of Turbulent Flows is written by one of the most prolific authors in the field of CFD. Professor of Aerodynamics at SUPAERO and Director of DMAE at ONERA, Professor Tuncer Cebeci calls on both his academic and industrial experience when presenting this work. Each chapter has been specifically constructed to provide a comprehensive overview of turbulent flow and its measurement. Analysis of Turbulent Flows serves as an advanced textbook for PhD candidates working in the field of CFD and is essential reading for researchers, practitioners in industry and MSc and MEng students. The field of CFD is strongly represented by the following corporate organizations: Boeing, Airbus, Thales, United Technologies and General Electric. Government bodies and academic institutions also have a strong interest in this exciting field. - An overview of the development and application of computational fluid dynamics (CFD), with real applications to industry - Contains a unique section on short-cut methods – simple approaches to practical engineering problems
Download or read book Considerations Regarding the Evaluation and Reduction of Supersonic Skin Friction written by John B. Peterson and published by . This book was released on 1966 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Publications of the Jet Propulsion Laboratory January 1938 Through June 1961 written by D. K. Walsh and published by . This book was released on 1961 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt:
