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Incipient stall characterization from skin friction maps

Miozzi, Massimo and Klein, Christian and Di Felice, Fabio and Costantini, Marco (2019) Incipient stall characterization from skin friction maps. In: 54th 3AF International Conference on Applied Aerodynamics (FP62), pp. 1-10. 54th 3AF International Conference on Applied Aerodynamics, 25. - 27. March 2019, Paris, France.

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Official URL: http://3af-aerodynamics2019.com/

Abstract

We experimentally characterize the incipient stall condition which develops on the suction side of a NACA 0015 hydrofoil model at Re = 180000, by observing the skin friction evolution on the model surface. Grounding on temperature data acquired via Temperature Sensitive Paint (TSP), the proposed approach adopts a two-fold point of view. From one side, the relative skin-friction vector fields, extracted from temperature maps by means of an optical-flow-based algorithm, provide flow topology at the wall and feed a physics-based criterion for the identification of flow separation and reattachment. From the other side, a direct link between friction velocity and celerity of propagation of temperature disturbances is established on the basis of currently available results in scientific literature. Then, the time averaged streamwise component of velocity of passive transport of temperature disturbances is estimated after minimization of the dissimilarity between observed and ideal wave behavior suggested by the Taylor hypothesis. Eventually, a quantitative estimation of time averaged friction-velocity maps is gained. We describe, through the synergistic application of the proposed methods, the incipient stall evolution by firstly identifying the trailing edge separation at an angle-of-attack AoA = 11.5° and then by capturing the onset of upstream oriented mushroom-like structures at AoA = 13°. The concomitant occurrence of both scenarios is reported as well (AoA = 12.2°).

Item URL in elib:https://elib.dlr.de/126999/
Document Type:Conference or Workshop Item (Speech)
Additional Information:Paper Nr.: 62, Es wird beabsichtigt, nach der Konferenz einen verbundenen Artikel für eine Special Issue von "International Journal of Numerical Methods for Heat & Fluid Flow" einzureichen.
Title:Incipient stall characterization from skin friction maps
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Miozzi, Massimomassimo.miozzi (at) cnr.itUNSPECIFIED
Klein, Christianchristian.klein (at) dlr.dehttps://orcid.org/0000-0001-7592-6922
Di Felice, Fabiofabio.difelice (at) cnr.itUNSPECIFIED
Costantini, Marcomarco.costantini (at) dlr.dehttps://orcid.org/0000-0003-0642-0199
Date:25 March 2019
Journal or Publication Title:54th 3AF International Conference on Applied Aerodynamics
Refereed publication:Yes
Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-10
Series Name:3AF Conference Proceedings
Status:Published
Keywords:Skin friction, Temperature-sensitive paint, Laminar separation bubble
Event Title:54th 3AF International Conference on Applied Aerodynamics
Event Location:Paris, France
Event Type:international Conference
Event Dates:25. - 27. March 2019
Organizer:3AF
Institution:Deutsches Zentrum für Luft- und Raumfahrt e.V.
Department:AS-EXV
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation and Validation
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Experimental Methods, GO
Deposited By: Micknaus, Ilka
Deposited On:10 Apr 2019 09:50
Last Modified:10 Apr 2019 09:50

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