A Study Of Three Dimensional Incompressible Turbulent Wall Jets
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A Study Of Three Dimensional Incompressible Turbulent Wall Jets
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Author : Pasquale M. Sforza
language : en
Publisher:
Release Date : 1967
A Study Of Three Dimensional Incompressible Turbulent Wall Jets written by Pasquale M. Sforza and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1967 with categories.
A Study Of Three Dimensional Incompressible Turbulent Wall Jets
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Author : Pasquale M. Sforza
language : en
Publisher:
Release Date : 1967
A Study Of Three Dimensional Incompressible Turbulent Wall Jets written by Pasquale M. Sforza and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1967 with Turbulent boundary layer categories.
An Experimental Investigation Of A Turbulent Incompressible Three Dimensional Wall Jet
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Author : Hermann Viets
language : en
Publisher:
Release Date : 1966
An Experimental Investigation Of A Turbulent Incompressible Three Dimensional Wall Jet written by Hermann Viets and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with Turbulent boundary layer categories.
This paper presents an experimental investigation of the bulk properties of a turbulent, three-dimensional, incompressible air wall jet issuing into a quiescent air ambient from a rectangular orifice parallel to and at the surface of a flat plate. Results of this study indicate the characteristic features of such a dissipative flow. The behavior of a three-dimensional flow field of this nature has associated with it three distinct regions in the axis velocity decay with an approach to the flow field of a radial wall jet far downstream of the jet exit and on the centerline of the flow. Spreading rates in the various cross planes display a dependence upon the aforementioned characteristic regions. (Author).
A Study Of Three Dimensional Incompressible Free Turbulent Air Jets
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Author : Obaidul Islam
language : en
Publisher:
Release Date : 1969
A Study Of Three Dimensional Incompressible Free Turbulent Air Jets written by Obaidul Islam and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1969 with categories.
An Experimental Investigation Of Three Dimensional Free Mixing Of Incompressible Turbulent Free Jets
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Author : Nicholas Trentacoste
language : en
Publisher:
Release Date : 1966
An Experimental Investigation Of Three Dimensional Free Mixing Of Incompressible Turbulent Free Jets written by Nicholas Trentacoste and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with Jets categories.
An experimental investigation of the bulk properties of turbulent, three-dimensional, incompressible, air jets issuing into a quiescent air ambient is presented. The jet orifices utilized included rectangular, elliptical, axisymmetric and triangular geometries. Experimental results of pertinent mean flow properties such as axis velocity decay, half-width growth, etc., are reported. The flow fields of such jets are found to be characterized by three distinct regions in the axis velocity decay. The results obtained lead to the conclusion that low-speed jets which originate from non-axisymmetric orifices decay to axisymmetry far downstream of the jet exit. (Author).
Three Dimensional Wall Jet Originating From A Circular Orifice
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Author : B. G. Newman
language : en
Publisher:
Release Date : 1971
Three Dimensional Wall Jet Originating From A Circular Orifice written by B. G. Newman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1971 with categories.
An incompressible three-dimensional turbulent wall jet originating from a circular orifice located adjacent to a plane wall is studied both theoretically and experimentally. An approximate similarity analysis predicts that two transverse length scales and the inverse of the mean velocity scale grow linearly with distance downstream x from the orifice. Experimental measurements of mean velocity and longitudinal turbulence intensity profiles were made both in air and water with hot-wire and hot-film anemometers respectively. The behavior predicted by the similarity analysis was verified.
Two Dimensional Incompressible Turbulent Curved Wall Jets
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Author : George Mon
language : en
Publisher:
Release Date : 1973
Two Dimensional Incompressible Turbulent Curved Wall Jets written by George Mon and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1973 with Jets categories.
NDS TO ATTACH ITSELF AND FLOW ALONG THE SURFACE. A theoretical and experimental study of the effects of the surface curvature on the flow field of a two-dimensional, incompressible, turbulent jet has been made. By using a perturbation technique, the governing equations for the flow have been obtained and solved numerically. There is flow similarity for a curved-wall jet when m = 1, and for the flow of a plane wall jet when the curvature approaches infinity. Two spiral and three circular cylindrical surfaces were tested. The mean velocity profiles and static pressure distributions were measured at various stations for each surface. In addition, the point of separation was found for Reynolds numbers, based on the nozzle width, in the range of 500 to 4000. The growth rates of the jet width and the rate of decay of the maximum velocity were deduced from the velocity measurements. (Modified author abstract).
A Computational Model For Three Dimensional Incompressible Wall Jets With Large Cross Flow
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Author : W. D. Murphy
language : en
Publisher:
Release Date : 1978
A Computational Model For Three Dimensional Incompressible Wall Jets With Large Cross Flow written by W. D. Murphy and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with categories.
The flow field of three dimensional incompressible wall jets prototypic of thrust augmenting ejectors with large cross flow is solved using a very efficient centered-Euler scheme in an orthogonal curvilinear coordinate system. The computational model treats initial conditions with arbitrary velocity profiles at or downstream of the jet exit. An averaging approach is employed for the first few marching steps to overcome spurious numerical oscillations associated with arbitrary initial profiles. Laminar as well as turbulent wall jets are simulated. Turbulence is introduced using a two layer mixing length model appropriate to curved three-dimensional wall jets. Typical results quantifying jet spreading, jet growth, nominal separation and jet shrink effects due to cross flow are presented.
Numerical Simulations Of Wall Jets
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Author :
language : en
Publisher:
Release Date : 1997
Numerical Simulations Of Wall Jets written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with categories.
This document summarizes the three year investigation of transitional and turbulent wall jets using direct numerical simulation (DNS) and large eddy simulation (LES). Towards this end, a three-dimensional, incompressible Navier-Stokes code developed in our research group for DNS of boundary-layer transition was adapted to the wall jet geometry. The code is based on the spatial model and is fourth-order accurate. For the LES, a Smagorinsky based subgrid-scale turbulence model and explicit fourth-order accurate compact filtering were incorporated. As an initial condition, a base flow close to Glauert's similarity solution of the laminar wall jet was employed. This flow was forced by blowing and suction through a slot in the wall. Periodic forcing was used for investigating primary and secondary instabilities in transitional wall jets (Re=2OO) We discovered competing two-dimensional (2-D) and three-dimensional (3-D) instability mechanisms which can be influenced significantly by the type of forcing. 2-D large/amplitude forcing produces (2-D) large coherent structures which reduce wall shear but may lead to ejections of vortices from the wall and even to a detachment of the wall jet. Additional 3-D forcing weakens these coherent structures (especially in the near-wall region) and can thus prevent vortex ejections. In our LES of turbulent wall jets, rapid breakdown to turbulence was triggered by large/amplitude 3-D random forcing. Despite the purely 3-D forcing, 2-D coherent structures still emerge in the free shear layer-like outer region, an indication of the strong 2-D instability of the wall jet. A fully turbulent mean flow which compares well with experiments is obtained for higher Reynolds numbers (Re=2OOO).
An Experimental Investigation Of Three Dimensional Incompressible Wall Jets On Curved Surfaces
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Author : Zdravko Milan Gabrijel
language : en
Publisher:
Release Date : 1972
An Experimental Investigation Of Three Dimensional Incompressible Wall Jets On Curved Surfaces written by Zdravko Milan Gabrijel and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1972 with categories.