Necessary Conditions for Transition in a Free Shear Layer.

Demetriades, Anthony

doi:10.21236/ada085514

Cited by 6 publications

(3 citation statements)

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“…The depressed growth rate of the two-dimensional Kelvin-Helmholtz disturbances, discussed in the previous section, may well alter the environment in which the three-dimensional motions develop, which are vital for the large interfacial area generation (see also Refs. [88][89][90]. At higher convective Mach numbers, shocks can certainly be expected to play an important role in this process.…”

Section: The Mixing Transitionmentioning

confidence: 99%

High-Speed Flight Propulsion Systems

Murthy¹,

Curran²

1991

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Section: The Mixing Transitionmentioning

confidence: 99%

High-Speed Flight Propulsion Systems

Murthy¹,

Curran²

1991

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“…1 it was shown that if a minimum or threshold turbulence Reynolds number Re AO is necessary to maintain turbulence in a wake, then a transition Reynolds number can be computed that agrees satisfactorily with experimental data. In the present work similar results are sought for the twodimensional free shear layer separating two streams of velocity u l and u 2 , respectively.…”

Section: Contentsmentioning

confidence: 69%

Laminar-Turbulent Transition in Free Shear Layers

1981

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A STUDY has been performed to derive a threshold criterion for the existence of turbulence in a shear layer, and to see if such a threshold is useful in predicting transition onset in such a flow. This approach has already given satisfactory results in wake flows. l As in the latter case, the present work 2 is based on the existence of a minimum turbulence Reynolds number, and derives numerical results by utilizing established magnitudes of turbulence properties in the turbulent shear layer. Transition Reynolds numbers are predicted as a function of speed ratio, total temperature ratio, and Mach number jumps across the layer. New experiments are described in which free shear-layer transition was measured and, within an observed unit Reynolds-number effect, was found to parallel the predictions quite well.

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“…(4) or eq. 7, which led to the present experiments, are described, it is necessary to summarize the reservations which a fluid dynamicist should have in using the present theory, and especially equations (4) and 7 f. In predicting transition events or comparing the equations with data. note that transition to turbulence in a shear flow is an event protracted over several, often many, shear layer thicknesses, usually preceded by instabilities and followed by a period of turbulence non-equilibrium.…”

Section: Application To Free Shear Layersmentioning

confidence: 99%

Experimental Study of Transition in a Compressible Free Shear Layer

Demetriades¹,

Brower²

1982

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well with numerical methods. The transition and laminar flow theories are then joined to design an experiment aimed at producing non-equilibrium flows in a supersonic wind-tunnel, and at detecting the transition zone in such a flow. Flow and transition measurements done in this layer show that the shear-layer transition Reynolds number, based on the layer thickness and the fast-side unit Reynolds number, agrees with the corresponding number found by the equilibrium transition theory within 25%. It is concluded that the asymptotic transition theory utilized gives reasonable estimates even close to the trailing edge. Accession For NTIS GRA&I DTIC TAB Unanneunced El Justification By. Distribution/ Availability Codes Avail and/or fs Special StCuRITY CLASSIFICATIOU OF '-tAGE(tthtn Dole Er,

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Necessary Conditions for Transition in a Free Shear Layer.

Cited by 6 publications

References 16 publications

High-Speed Flight Propulsion Systems

High-Speed Flight Propulsion Systems

Laminar-Turbulent Transition in Free Shear Layers

Experimental Study of Transition in a Compressible Free Shear Layer

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