A Study of Three-dimensional, Incompressible, Turbulent Wall Jets PDF Download

Author: Pasquale M. Sforza
Publisher:
ISBN:
Category :
Languages : en
Pages : 83

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Author: Pasquale M. Sforza
Publisher:
ISBN:
Category : Turbulent boundary layer
Languages : en
Pages : 0

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Author: Hermann Viets
Publisher:
ISBN:
Category : Turbulent boundary layer
Languages : en
Pages : 40

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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: Obaidul Islam
Publisher:
ISBN:
Category :
Languages : en
Pages : 200

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Author: Nicholas Trentacoste
Publisher:
ISBN:
Category : Jets
Languages : en
Pages : 72

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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).

Author: Zdravko Milan Gabrijel
Publisher:
ISBN:
Category :
Languages : en
Pages : 164

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Author: W. D. Murphy
Publisher:
ISBN:
Category :
Languages : en
Pages : 118

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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.

Author: Pani, Bidya Sagar
Publisher: 1972.
ISBN:
Category :
Languages : en
Pages : 314

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Author: Norman D. Malmuth
Publisher:
ISBN:
Category :
Languages : en
Pages : 108

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A computational model based on H. Keller's box scheme has been used to characterize turbulent incompressible wall jets in the small cross flow approximation prototypic of flows over upper-surface-blown and augmenter wings. Submerged and coflowing cases are considered. An eddy viscosity model was used to simulate the effects of turbulence. Approximate models are identified for flows in which the jet height tends to zero. If the span flow is introduced through a lateral curvature term appearing in the spanwise momentum equation, the effect of the turbulent coupling on the surface pressures, and peak spanwise velocities is weak. (Author).

Author: George Dominic Catalano
Publisher:
ISBN:
Category : Jets
Languages : en
Pages : 390

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