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Fluid Dynamics

Erschienen in:

01.11.2020

Transition to Turbulence through Intermittence in Inert and Reacting Jets

verfasst von: V. V. Lemanov, V. V. Lukashov, K. A. Sharov

Erschienen in: Fluid Dynamics | Ausgabe 6/2020

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Abstract—

Subsonic flows of different gases in the near field of inert and reacting jets is experimentally investigated. The jets flowed out of long tubes, 2 to 8 mm in diameter, into an air medium at low Reynolds numbers from 400 to 5000. The working fluids were air, carbon dioxide, propane, and Freon-22 for inert isothermal jets and propane mixed with an inert dilution (СО₂) for reacting jets. The tools included Hilbert visualization, PIV, thot-wire anemometry, and probe thermometry. A scenario of transition to turbulence through the intermittence mechanism in inert and reacting jets is revealed for the first time. It is realized in the Reynolds number range from 1900 to 3500, when laminar-turbulent transition occurs within the jet source, that is, the tube, in the absence of artificial disturbances. Turbulent spots generated in the tube in the transitional regime are statistical in nature and fairly stable in the jet near-field. Propagating downstream they can have a considerable effect on the dynamics of free jets and diffusion plumes.

Vorheriger Artikel Structure and Dynamics of Large-Scale Circulation in Turbulent Convection at High Prandtl Numbers

Nächster Artikel Applicability of Two-Parameter Turbulence Models to Simulation of the Interaction of Near-Wall Flows with Blowing and Suction on Permeable Surfaces

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Titel: Transition to Turbulence through Intermittence in Inert and Reacting Jets
verfasst von: V. V. Lemanov
V. V. Lukashov
K. A. Sharov
Publikationsdatum: 01.11.2020
Verlag: Pleiades Publishing
Erschienen in: Fluid Dynamics / Ausgabe 6/2020
Print ISSN: 0015-4628
Elektronische ISSN: 1573-8507
DOI: https://doi.org/10.1134/S0015462820060087

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