Investigation of Features of Flow of Three-Dimensional Turbulent Wall Jets with and Without Pressure Gradient PDF Download
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Author: John R. Weske Publisher: ISBN: Category : Languages : en Pages : 24
Book Description
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).
Author: John R. Weske Publisher: ISBN: Category : Languages : en Pages : 24
Book Description
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).
Author: Douglas Howard Neale Publisher: ISBN: Category : Jets Languages : en Pages : 534
Book Description
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).
Author: Hermann Viets Publisher: ISBN: Category : Turbulent boundary layer Languages : en Pages : 40
Book Description
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).
Author: John R. Weske
Author: John R. Weske
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Author: United States. National Bureau of Standards
Author: Douglas Howard Neale
Author: Hermann Viets
Author: United States. National Bureau of Standards
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Author: 
Author: United States. National Bureau of Standards
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