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The Wall Jet In A Longitudinal Pressure Gradient
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Book Synopsis The Wall-jet in a Longitudinal Pressure Gradient by : F. Erian
Download or read book The Wall-jet in a Longitudinal Pressure Gradient written by F. Erian and published by . This book was released on 1964 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of the work are two fold. Firstly, its studies the effect of a longitudinal pressure gradient on the nature of the shear stress distribution, as well as the mechanism of energy-production. Secondly, it explores to find out if the existence of pressure gradients increased, in the flow field, the size of the negative energy-production region. The flow pattern used in conducting the present experiments was composed of a half-jet blowing out of a narrow vertical slot of large aspect ratio. The jet was bounded by a smooth rigid flat wall on one side, and mixing with a slower stream of air on the free side. A convergent then divergent passage was provided for the entire flow by placing a half symmetrical Joukowski airfoil section on the free stream side of the wind tunnel. This airfoil section not only created a longitudinal variation in the free stream velocity, but also a pressure gradient which changed sign from negative in the convergent part of the passage to positive in the divergent part.
Book Synopsis Experimental Study of Two-dimensional Turbulent Wall Jet Development with and Without Longitudinal Free Stream Pressure Gradient by : Douglas Howard Neale
Download or read book Experimental Study of Two-dimensional Turbulent Wall Jet Development with and Without Longitudinal Free Stream Pressure Gradient written by Douglas Howard Neale and published by . This book was released on 1971 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental study of various wall jet flows was conducted. The major areas of investigation were: The wall jet injected into still air; The wall jet under a constant-pressure main-stream flow; The wall jet subjected to an adverse pressure gradient imposed by a retarded main-stream flow with a substantially thickened initial boundary layer; The wall jet subjected to an adverse pressure gradient imposed by a retarded main-stream flow with a thickened and distorted initial boundary layer. Detailed velocity profile and local skin friction measurements were made at numerous streamwise distances from the jet slot. For the case in which no main-stream flow was present, the studies were carried out for a wide range of slot Reynolds numbers. For the wall jets with main-stream flow, selected ratios of free-stream velocity to jet velocity at the jet slot were investigated. The growth of characteristic thickness and decay of jet peak velocity is presented for all wall jet studies. Also, velocity and temperature profile similarity is described. Skin friction laws are shown for the constant-pressure wall jets and a single 'law of the wall' valid for all wall jet studies is set forth. Finally, the skin friction and velocity profile measurements are presented in tabular form. (Author).
Book Synopsis The Turbulent Wall Jet in an Arbitrary Pressure Gradient by : I. S. Gartshore
Download or read book The Turbulent Wall Jet in an Arbitrary Pressure Gradient written by I. S. Gartshore and published by . This book was released on 1967 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: A method for calculating the growth of a turbulent wall jet in streaming flow was developed. The flow is assumed to be two-dimensional, incompressible and over a plane, smooth wall. Downstream variations of pressure are permitted and separation in an adverse pressure gradient may be predicted. The method incorporates procedures for matching the flow to that at the blowing slot, although it is postulated that the upstream boundary layer there is thin enough that the wall jet develops without an unmixed wake (i.e. there is not a minimum in the mean-velocity profile). The method incorporates four integral momentum equations taken from the wall to various points in the flow. The calculation of the outer shearing stress, although empirical, is based on the large-eddy equilibrium hypothesis and therefore has some foundation. The remaining empiricism in the method is based on measurements in self-preserving wall jets. The method was used to predict the jet-momentum coefficient required to suppress separation over a trailing-edge flap attached to a thin aerofoil. Plausible curves have been obtained using assumed values of upstream boundary layer at the slot. (Author).
Download or read book Turbulent Jets written by N. Rajaratnam and published by Elsevier. This book was released on 1976-01-01 with total page 315 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulent Jets
Book Synopsis THE WALL-JET IN A MOVING STREAM. by : V. Kruka
Download or read book THE WALL-JET IN A MOVING STREAM. written by V. Kruka and published by . This book was released on 1963 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: The wall-jet is the flow of fluid emanating from a narrow slot and blowing over a rigid wall. The width of the slot is of the order of the boundary layer on the infinite wall and the jet, in this case, mixes with a stream moving with constant velocity. This flow has drawn considerable basic and applied interest in the past few years for it has the characteristics of both a boundary layer and a free mixing flow. The present experimental investigation of a plane, steady, turbulent wall-jet with negligible longitudinal pressure gradients in a constant moving stream, with varying ratios of jet to free stream velocity definitely supports Glauert's reasoning (The Wall-Jet. J. Fluid Mech., v.1, part 6, 1956), though the precise point of partition of the flow might be in question. The inner layer is constantly losing momentum due to the frictional stresses at the wall, while the outer layer preserves its momentum; the division now occurring at the point of zero shear which is not at the maximum velocity. The analysis and experimental results are compared with those of previous investigators and a definite comparison of this work with those performed in a quiescent free stream is achieved through transformation of coordinates. (Author).
Book Synopsis Measurements in a Self Preserving Plane Wall Jet in a Positive Pressure Gradient by : Hamlyn Peter A. H. Irwin
Download or read book Measurements in a Self Preserving Plane Wall Jet in a Positive Pressure Gradient written by Hamlyn Peter A. H. Irwin and published by . This book was released on 1973 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurements of a wall jet in a self-preserving pressure gradient are described. The quantities measured with a linearized hot-wire anemometer were the mean velocity, the turbulence stresses, triple and quadruple velocity correlations, intermittency and spectra of the longitudinal turbulence intensity.
Book Synopsis The Incompressible Turbulent Wall Jet in an Adverse Pressure Gradient by : Wallace Alexander McGahan
Download or read book The Incompressible Turbulent Wall Jet in an Adverse Pressure Gradient written by Wallace Alexander McGahan and published by . This book was released on 1965 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Note written by and published by . This book was released on 1975 with total page 562 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Some Contributions to the Study of Equilibrium and Non-equilibrium Turbulent Wall Jets Over Curved Surfaces by : D. E. Guitton
Download or read book Some Contributions to the Study of Equilibrium and Non-equilibrium Turbulent Wall Jets Over Curved Surfaces written by D. E. Guitton and published by 1970 [c1974]. This book was released on 1970 with total page 826 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Forced Turbulent Wall Jet Effects of Pressure Gradient and Curvature by :
Download or read book The Forced Turbulent Wall Jet Effects of Pressure Gradient and Curvature written by and published by . This book was released on 1996 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt: The studies completed in the period of the proposal were in three parts: (1) Both hot wire and PIV data have been obtained on the Coanda cylinder. Strong influences of curvature and of the pressure gradient on the mean and the turbulence quantities were found. New structures were observed around the cylinder in the forced case. A theoretical model was established for the mean flow, which will be an important tool in the further stability studies. (2) Two types of weak wall jet have been observed. Length and velocity scales were found and applied in successful normalization of the mean velocity profiles. Furthermore, three instability modes, coupled to each other, were investigated through forcing. (3) A novel technique for identification of coherent motions was developed which can eliminate the influence of phase jitter and discover much more coherent energy than the conventional phase locked ensemble averaging technique, based on which a reasonable coherent energy budget was established for the first time. This technique will be applied to explore the role of coherent motion in the control of separation.
Book Synopsis U.S. Government Research Reports by :
Download or read book U.S. Government Research Reports written by and published by . This book was released on 1964 with total page 1118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis On the Generation of Wall Pressure Fluctuations for Turbulent Boundary Layers Over Rough Walls by : Thomas E. Burton
Download or read book On the Generation of Wall Pressure Fluctuations for Turbulent Boundary Layers Over Rough Walls written by Thomas E. Burton and published by . This book was released on 1971 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of pressure-velocity correlation in turbulent flow was extended to turbulent boundary layer flow over a roughened wall in the absence of a longitudinal pressure gradient. The results obtained are qualitatively similar to those previously measured over smooth walls. A theory is presented to partially explain the behavior of the measured correlations in both the smooth-wall and rough-wall cases.
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 1982 with total page 1282 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Book Synopsis Concentration Measurements of an Injected Gas in a Supersonic Stream by : Marvin G. Torrence
Download or read book Concentration Measurements of an Injected Gas in a Supersonic Stream written by Marvin G. Torrence and published by . This book was released on 1967 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Energy Dissipation in Hydraulic Structures by : Hubert Chanson
Download or read book Energy Dissipation in Hydraulic Structures written by Hubert Chanson and published by CRC Press. This book was released on 2015-05-12 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent advances in technology have permitted the construction of large dams, reservoirs and channels. This progress has necessitated the development of new design and construction techniques, particularly with the provision of adequate flood release facilities. Chutes and spillways are designed to spill large water discharges over a hydraulic struc
Book Synopsis The Aerodynamics of Circulation Control Aerofoils by : N. J. Wood
Download or read book The Aerodynamics of Circulation Control Aerofoils written by N. J. Wood and published by . This book was released on 1981 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Progress in Turbulence IX by : Ramis Örlü
Download or read book Progress in Turbulence IX written by Ramis Örlü and published by Springer Nature. This book was released on 2021-10-23 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume collects the edited and reviewed contribution presented in the 9th iTi Conference that took place virtually, covering fundamental and applied aspects in turbulence. In the spirit of the iTi conference, the volume is produced after the conference so that the authors had the opportunity to incorporate comments and discussions raised during the meeting. In the present book, the contributions have been structured according to the topics: I Experiments II Simulations and Modelling III Data Processing and Scaling IV Theory V Miscellaneous topics
