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Measurements on the effect of steps on the transition of laminar boundary layers

Heintz, Alexander and Scholz, Peter (2023) Measurements on the effect of steps on the transition of laminar boundary layers. Experiments in Fluids, 64 (76), pp. 1-12. Springer Nature. doi: 10.1007/s00348-023-03614-x. ISSN 0723-4864.

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The effects of steps on the transition of laminar boundary layers were measured on a flat plate for low Reynolds numbers with critical and subcritical step heights. The transition position was measured by determining the intermittency distribution in streamwise direction, including the characteristic length of the transitional region. The results are compared with formulations of a critical step Reynolds number Re_h, i.e., the step height that will instantly trigger transition at the step position, and—for subcritical step heights—with ΔN-formulations from the literature. For backward-facing steps, the concept of a step Reynolds number can be used to distinguish between subcritical and critical step heights, whereas for forward-facing steps there seems not to be one unique Re_h. Furthermore, for subcritical backward-facing steps the concept of a ΔN-approximation gives a reasonable description of the experimental observations. Again in contrast, for forward-facing steps a ΔN-approach scattered a lot and no clear dependency was found between the reduction in the critical N-factor of transition and the relative step height.

Item URL in elib:https://elib.dlr.de/194486/
Document Type:Article
Title:Measurements on the effect of steps on the transition of laminar boundary layers
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Scholz, PeterInstitute of Fluid Mechanics, Technische Universität BraunschweigUNSPECIFIEDUNSPECIFIED
Date:27 March 2023
Journal or Publication Title:Experiments in Fluids
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 1-12
Publisher:Springer Nature
Keywords:Boundary Layer, Forward and Backward Facing Steps, stability theory, Transition prediction, Roughness, Laminar-Turbulent Transition
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Efficient Vehicle
DLR - Research area:Aeronautics
DLR - Program:L EV - Efficient Vehicle
DLR - Research theme (Project):L - Virtual Aircraft and  Validation
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Helicopter, GO
Deposited By: Heintz, Alexander
Deposited On:11 Apr 2023 10:54
Last Modified:12 May 2023 13:06

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