Download or read book The Sharp Leading Edge Problem in Hypersonic Flow written by Hakurō Oguchi and published by . This book was released on 1960 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Problem of Sharp Leading Edge in Hypersonic Flow written by Amolak C. Jain and published by . This book was released on 1963 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: In what follows an attempt is made to present the analysis of this problem without the restric tion of wedge-like flow model and at the same time remove certain discrepancies in Oguchi's work. A new transformation is found and a series solution of the resulting equation is evolved. Analytical expressions for the first two terms of this series are obtained. The induced pressures computed on the basis of these two terms is com pared with the experimental results of Nagamatsu, Sheer and Weil. We find that, in the range of validity of our solution, the theoretical predic tion of the induced pressure agrees fairly well within a certain Mach Number range with the experimental data of Nagamatsu, Sheer and Weil.
Download or read book The Sharp Leading Edge Problem in Hypersonic Flow written by Hakuro Oguchi and published by . This book was released on 1960 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the present paper the problem of hypersonic viscous flow past a semi-infinite flat plate with a sharp leading edge is considered. The study is concerned primarily with the rarefied flow region close enough to the leading edge that there is no longer an inviscid layer but where the shock wave is still thin. The solution which is obtained is shown to approach a wedge-like flow near the leading edge with a straight induced shock wave.
Download or read book A Critical Assessment of the Problem of Sharp Leading Edge of a Flat Plate in Hypersonic Flow written by Amolak C. Jain and published by . This book was released on 1964 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: The advent of vehicles, moving many times the velocity of sound makes it necessary to understand clearly the various phenomena occuring near the sharp leading edge of a flat plate. A few theoretical attempts to tackle this problem are made and several experiments are performed at various places. Unfortunately wide areas of disagree ment exist between the various theoretical investigations and experimental results. It is the purpose of the note to try to gather some useful information from the available literature on this subject and present some suggestions which might be useful or worth consideration in any future attempt of solving this problem. (Author).
Download or read book An Experimental Model for the Sharp Leading Edge Problem in Rarefied Hypersonic Flow written by W. J. McCroskey and published by . This book was released on 1966 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flow field studies of the shock wave and boundary layer development on a sharp flat plate are presented for a region of rarefied flow that bridges the gap between a classical hypersonic boundary layer downstream and a kinetic flow model at the leading edge. The measurements give a comprehensive picture of the flow pattern in the 'merged layer' or 'viscous layer' regime, which exists upstream of the region of validity of hypersonic viscous interaction theory. The results are derived from a combination of several probing and optical techniques and surface pressure measurements. From the detailed measurements, a true scale physical model of the flow field is constructed for the merged layer regime. One of the main features of the model is a thick, curved shock wave which decreases in strength as the leading edge is approached, even though the shock angle increases. Density profiles across the shock and viscous layers show that the structure of the flow field is quite different from the classical picture of a hypersonic boundary layer beneath an oblique Rankine-Hugonio shock wave. (Author).
Download or read book The Hypersonic Leading Edge Problem II Wedges and Cones written by Michael Lewis Shorenstein and published by . This book was released on 1971 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: An analysis is given for the viscous hypersonic flow past slender sharp wedges and unyawed cones. The leading edge or nose region treated encompasses the merged layer regime in which the shock thickness is not small in comparison with the viscous layer thickness but for which in the axisymmetric case the shock thickness is small in comparison with the radius of transverse shock curvature. A Navier-Stokes flow is assumed, and both the shock structure and viscous layer are taken to be locally-similar of boundary layer type. The analysis follows that used by Shorenstein and Probstein for the corresponding flat plat problem. For axisymmetric cone flow, a modification of a transformation introduced by Probstein and Elliott is given to reduce the axisymmetric viscous layer equations including transverse curvature to 'exactly' two-dimensional form. Results for the state conditions behind the shock, and the wall pressure, skin friction, and heat transfer rate are found to be in agreement with available experimental data.
Download or read book On the Hypersonic Sharp Leading Edge Problem for Bodies Other Than Flat Plates written by Jay M. Solomon and published by . This book was released on 1965 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The flow near the tip of pointed nosed bodies in hypersonic flight is considered. In particular, the region where continuum concepts are applicable, but where boundary layer theory is no longer valid, is studied using the model proposed by Oguchi for the flat plate problem. Both two-dimensional and axiallysymmetric bodies are considered. Solutions are obtained in the form of expansions valid near the nose tip. The surface pressure is found to approach a finite value as the tip is approached; numerical results for this limit value are obtained for various wall to total temperature ratios and tip semi-vertex angles. (Author).
Download or read book Hypersonic Gas Flow Past a Flat Plate with a Sharp Leading Edge written by G. M. Poedintsev and published by . This book was released on 1969 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: The problem of hypersonic gas flow over a plane plate with a sharp leading edge is discussed. It is assumed that the gas is perfect with a constant specific heat ratio and that the plate is thermally insulated. The problem is solved theoretically on the basis of a model which makes use of the geometrical characteristics of the Navier-Stokes equations. (Author).
Download or read book A Study of the Hypersonic Leading Edge Flow in the Merged Layer and Strong Interaction Regimes written by Richard W. Garvine and published by . This book was released on 1968 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: The problem of hypersonic flow near the leading edge of a sharp-edged body is investigated. The region of chief interest is the merged layer flow regime just upstream of the strong interaction regime. The limitations of applying continuum equations to the leading edge flow are discussed. A system of composite equations applicable to the merged layer and strong interaction flow regime is then developed systematically from the Navier-Stokes equations for the steady, planar or axi-symmetric flow of a perfect gas. Limited numerical solutions of these equations are described for the case of a sharp-edged flat plate. Owing to the presence of weak upstream influence in the problem, divergent behavior is encountered in the numerical treatment of the problem. The divergence scale is quite small, and prevents extensive calculations for the merged layer from being made. It is concluded that another means for numerical solution of the equations is required if practical computation times are to be achieved. (Author).
Download or read book The Blunt leading edge Problem in Hypersonic Flow written by Hakurō Oguchi and published by . This book was released on 1961 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: Study was made of the hypersonic flow over a flat plate with a blunt nose. The analysis is based on the flow model in which the flow field behind the shock wave may be divided into two regions: (1) the inviscid-hypersonic-flow region and (2) the entropy layer, across which the pressure undergoes no appreciable change. (Author).
Download or read book Rarefied Gas Dynamics written by Carlo Cercignani and published by Cambridge University Press. This book was released on 2000-02-28 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this book is to present the concepts, methods and applications of kinetic theory to rarefied gas dynamics. After introducing the basic tools, problems in plane geometry are treated using approximation techniques (perturbation and numerical methods). These same techniques are later used to deal with two- and three-dimensional problems. The models include not only monatomic but also polyatomic gases, mixtures, chemical reactions. A special chapter is devoted to evaporation and condensation phenomena. Each section is accompanied by problems which are mainly intended to demonstrate the use of the material in the text and to outline additional subjects, results and equations. This will help ensure that the book can be used for a range of graduate courses in aerospace engineering or applied mathematics.
Download or read book The High Temperature Aspects of Hypersonic Flow written by Wilbur C. Nelson and published by Elsevier. This book was released on 2014-12-02 with total page 801 pages. Available in PDF, EPUB and Kindle. Book excerpt: The High Temperature Aspects of Hypersonic Flow is a record of the proceedings of the AGARD-NATO Specialists' Meeting, held at the Technical Centre for Experimental Aerodynamics, Rhode-Saint-Genese, Belgium in April 1962. The book contains the papers presented during the meeting that tackled a broad range of topics in the aspects of hypersonic flow. The subjects covered during the meeting include pressure measurements, interference effects, the use of wind tunnels in aircraft development testing, high temperature gas characteristics, boundary layer research, stability and control and the use of rocket vehicles in flight research. Aerospace engineers and aeronautical engineers will find the book invaluable.
Download or read book On the Hypersonic Flow Over a Delta Wing with Very Supersonic Leading Edges written by Norman D. Malmuth and published by . This book was released on 1965 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Series Truncation Analysis of the Hypersonic Leading Edge Problem written by George Schwier and published by . This book was released on 1969 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: The flow about a sharp semi-infinite flat plate in a hypersonic stream is considered. The governing equations are assumed to be the full compressible Navier-Stokes equations with appropriate boundary conditions. The effect of velocity slip and temperature jump at the wall are considered. Solutions of the governing two-point assymptotic boundary value problem are attempted by reduction of the governing partial differential equations to a system of ordinary differential equations by means of an independent variable transformation and a eries truncation analysis. The dependent variables are expanded in terms of a power series of one of the independent variables with coefficients assumed to be functions of the other independent variable. The resulting infinite system of simultaneous equations can be solved by successive truncations of the assumed series expansions of the independent variables.
Download or read book Flowfield Surveys in the Leading Edge Region of a Sharp Flat Plate written by Robert J. Vidal and published by . This book was released on 1971 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: Data obtained in the hypersonic viscous shock layer of a sharp flat plate are presented. These were obtained with speed-ratio probes operating under free-molecule conditions, and the measurements are interpreted with the theory for free-molecule flows as the local speed-ratio, and the local value of the product. These show that the initial disturbance from the plate extends about twelve ambient mean-free-paths ahead of the leading edge. In the immediate vicinity of the leading edge (vertically less than five ambient mean-free-paths) the disturbance causes a decrease in the speed ratio, and no change in the product. Beyond five mean-free-paths from the surface, the disturbance produces a simultaneous increase in the local value of the product and a decrease in speed-ratio. The data obtained within the viscous shock layer show there is a well-defined boundary where the measurements of the local value of the product show a pronounced decrease. This is identified as the boundary where viscous heating dominates, and its location is found to be in good agreement with the position of the shock wave determined from low-density schlieren observations. This is because viscous heating in the flowfield produces a stronger density gradient than the upstream compression process. Lateral profiles of the speed-ratio are in good agreement with other temperature data.
Download or read book Introduction to Hypersonic Flow written by G. G. Chernyi and published by Academic Press. This book was released on 2013-10-22 with total page 277 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction to Hypersonic Flow has been made available to the English speaking reader because of its usefulness for those individuals desirous of obtaining an introduction to the subject. Written by an internationally acknowledged expert in the field of hypersonic flow, the book makes available heretofore unpublished Soviet work, as well as published work little known outside the Soviet Union. The author has however made every effort to include, where appropriate. Western references for the work he discusses. Starting with a general introductory chapter on hypersonic aerodynamics and aerodynamic problems, the remainder of the book concentrates on the inviscid, perfect fluid aspects of hypersonic flow, with emphasis on the fundamental concepts and rational methods of calculation. The book is directed to students of aerodynamics and gas dynamics, as well as to scientists and engineers interested in problems of hypersonic flight. The level of approach is such that it should prove particularly useful as an undergraduate and introductory graduate text.
Download or read book Effects of Leading edge Bluntness and Ramp Deflection Angle on Laminar Boundary layer Separation in Hypersonic Flow written by James Courtland Townsend and published by . This book was released on 1966 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
