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The Turbulent Wall Jet In An Arbitrary Pressure Gradient
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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 Flows written by Jean Piquet and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 767 pages. Available in PDF, EPUB and Kindle. Book excerpt: obtained are still severely limited to low Reynolds numbers (about only one decade better than direct numerical simulations), and the interpretation of such calculations for complex, curved geometries is still unclear. It is evident that a lot of work (and a very significant increase in available computing power) is required before such methods can be adopted in daily's engineering practice. I hope to l"Cport on all these topics in a near future. The book is divided into six chapters, each· chapter in subchapters, sections and subsections. The first part is introduced by Chapter 1 which summarizes the equations of fluid mechanies, it is developed in C~apters 2 to 4 devoted to the construction of turbulence models. What has been called "engineering methods" is considered in Chapter 2 where the Reynolds averaged equations al"C established and the closure problem studied (§1-3). A first detailed study of homogeneous turbulent flows follows (§4). It includes a review of available experimental data and their modeling. The eddy viscosity concept is analyzed in §5 with the l"Csulting ~alar-transport equation models such as the famous K-e model. Reynolds stl"Css models (Chapter 4) require a preliminary consideration of two-point turbulence concepts which are developed in Chapter 3 devoted to homogeneous turbulence. We review the two-point moments of velocity fields and their spectral transforms (§ 1), their general dynamics (§2) with the particular case of homogeneous, isotropie turbulence (§3) whel"C the so-called Kolmogorov's assumptions are discussed at length.
Book Synopsis An Integral Method for the Calculation of the Development of Turbulent Wall Jets in Arbitrary Pressure Gradients by : A. G. T. Cross
Download or read book An Integral Method for the Calculation of the Development of Turbulent Wall Jets in Arbitrary Pressure Gradients written by A. G. T. Cross and published by . This book was released on 1975 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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:
Book Synopsis Turbulent Wall Jet in a Coflowing Stream by : James Franklin Campbell
Download or read book Turbulent Wall Jet in a Coflowing Stream written by James Franklin Campbell and published by . This book was released on 1975 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 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 Investigation of Features of Flow of Three-Dimensional Turbulent Wall Jets with and Without Pressure Gradient by : John R. Weske
Download or read book Investigation of Features of Flow of Three-Dimensional Turbulent Wall Jets with and Without Pressure Gradient written by John R. Weske and published by . This book was released on 1968 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: The characteristics of 3-dimensional wall jets are strongly influenced by secondary motion particularly in the region close to the nozzle. There is evidence suggesting that jets from narrow and tall nozzles will spread a wall jet more broadly over a wall than low and broad nozzles. Three-dimensional wall jets with pressure gradients, in the region close to the nozzle are subject to the same effects of secondary motions as are wall jets without pressure gradients, while in their later course they may acquire the characteristics of turbulent flow in ducts. Theoretical investigation of the action of Reynolds stresses serves to clarify the nature of secondary motions and to show the reason for contrasting characteristics of secondary flow in jets and in ducts as well as the fading out of secondary motion with increasing jet diffusion. (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 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 Self Preserving, Two-dimensional Turbulent Jets and Wall Jets in a Moving Stream by : Rajnikant Purshottam Patel
Download or read book Self Preserving, Two-dimensional Turbulent Jets and Wall Jets in a Moving Stream written by Rajnikant Purshottam Patel and published by . This book was released on 1961 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Prediction methods for jet V/STOL propulsion aerodynamics by : M. F. Platzer
Download or read book Prediction methods for jet V/STOL propulsion aerodynamics written by M. F. Platzer and published by . This book was released on 1975 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Structure of Two-Dimensional Turbulent Wall-Jets in the Presence of Adverse Pressure Gradients by : Demosthenes Papailiou
Download or read book Structure of Two-Dimensional Turbulent Wall-Jets in the Presence of Adverse Pressure Gradients written by Demosthenes Papailiou and published by . This book was released on 1975 with total page 77 pages. Available in PDF, EPUB and Kindle. Book excerpt: The mechanism by which wall jets prevent boundary layer separation and diffuser stall has been experimentally examined. Mean velocity profiles and turbulence statistics in both the separated and jet-energized boundary layer have been measured in the presence of a coflowing stream and adverse pressure gradients. Some preliminary conclusions are suggested. (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.
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 Plane Turbulent Wall Jet, Part II: Heat Transfer by : Stanford University. Thermosciences Division. Thermosciences Division
Download or read book Plane Turbulent Wall Jet, Part II: Heat Transfer written by Stanford University. Thermosciences Division. Thermosciences Division and published by . This book was released on 1961 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: The heat transfer characteristics of plane, turbulent wall jets are investigated. An analytical prediction is made for the Stanton number and experimental data are presented for a step in wall temperature. The methd for extending this data to arbitrary heating conditions is shown. Temperature surveys in the wall jet boundary are also presented. (Author).
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.
