Two Dimensional Turbulent Jet Mixing Considering Effects Of Initial Boundary Layer Configuration
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Two-dimensional Turbulent Mixing Between Parallel Incompressible Jets Considering Effects of Initial Boundary Layer Configuration
Author | : Morris Elsmere Childs |
Publisher | : |
Total Pages | : 166 |
Release | : 1956 |
Genre | : Turbulent boundary layer |
ISBN | : |
Effects of Initial Boundary Layer Conditions on Jet Mixing
Author | : William G Hill (Jr) |
Publisher | : |
Total Pages | : 109 |
Release | : 1975 |
Genre | : |
ISBN | : |
This report describes an experimental investigation of the effects of nozzle exit boundary layer conditions on turbulent mixing in free jets. Mean velocity and turbulence measurements were obtained in flow fields produced by several axisymmetric and two dimensional nozzles with exit velocities in the range of 30 to 800 ft/sec. With tripped turbulent initial boundary layers, spatial mixing rates were found to be independent of jet exit velocity, the mean flow fields scaled with nozzle exit dimensions, and the same results were obtained with different air supply facilities. With laminar and transitional initial nozzle boundary layers the core lengths were found to be unpredictable, showing large changes with both nozzle exit dimensions and velocity, and displaying a strong dependence on air supply facility characteristics. A clear conclusion from our investigation was that in experimental testing of models that incorporate free jets the nozzle wall boundary layer must be turbulent to eliminate a frequent source of poor agreement between model and full scale hardware performance. (Author).
Influence of Initial Boundary Layer on the Two-Dimensional Turbulent Mixing of a Single Stream
Author | : R. C. Bauer |
Publisher | : |
Total Pages | : 47 |
Release | : 1971 |
Genre | : Boundary layer |
ISBN | : |
An integral method is presented for estimating the influence of an initial boundary layer on the development of a two-dimensional, isobaric, turbulent, free shear layer. The basic equation is derived by applying the principle that, at any streamwise station along the free shear layer, the momentum of the entrained flow equals the total axial turbulent shear force acting along the dividing streamline. This equation is solved using a single parameter family of velocity profiles derived by Korst and Prandtl's mixing length concept for turbulent shear stress. The theory involves one empirical constant which was evaluated using Tollmien's experimental data for incompressible, turbulent mixing. The theory is verified by comparing with experimental data for free-stream Mach numbers up to 6.4. (Author).
An Analysis of Transonic Viscous/inviscid Interactions on Axisymmetric Bodies with Solid Strings Or Real Plumes
Author | : Steven F. Yaros |
Publisher | : |
Total Pages | : 178 |
Release | : 1978 |
Genre | : Aerodynamic load |
ISBN | : |
Flow Visualization Investigation of the Effects of the Initial Boundary Layer on Jet Mixing
Author | : William G Hill (Jr) |
Publisher | : |
Total Pages | : 18 |
Release | : 1976 |
Genre | : |
ISBN | : |
A series of spark schlieren photographs has been obtained for the initial mixing regions of both two dimensional and axisymmetric low speed jets. A large scale orderly structure was clearly present in the turbulent mixing when the initial boundary layer was laminar. When the boundary layer was tripped, the large scale structure appeared to be destroyed. (Author).
Analysis of the Mixing Region for a Two-dimensional Jet Injected at an Angle to a Moving Stream
Author | : Willis Braun |
Publisher | : |
Total Pages | : 36 |
Release | : 1969 |
Genre | : Functions of complex variables |
ISBN | : |
Numerical analysis of laminar and turbulent mixing region for two dimensional jet injected at angle to moving stream.
Kinetics, Equilibria and Performance of High Temperature Systems
Author | : Gilbert S. Bahn |
Publisher | : |
Total Pages | : 370 |
Release | : 1968 |
Genre | : High temperature chemistry |
ISBN | : |