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Aerodynamics of smooth and rough square-section prisms at incidence in very high Reynolds-number cross-flows

van Hinsberg, Nils (2021) Aerodynamics of smooth and rough square-section prisms at incidence in very high Reynolds-number cross-flows. Experiments in Fluids (62:50), pp. 1-17. Springer. doi: 10.1007/s00348-021-03143-5. ISSN 0723-4864.

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Abstract

The aerodynamics of smooth and slightly rough prisms with square cross-sections and sharp edges is investigated through wind tunnel experiments. Mean and fluctuating forces, the mean pitch moment, Strouhal numbers, the mean surface pressures and the mean wake profiles in the mid-span cross-section of the prism are recorded simultaneously for Reynolds numbers between 1x10^5 < ReD < 1x10^7. For the smooth prism with ks/D = 4x10^-5, tests were performed at three angles of incidence, i.e. alpha = 0deg, -22.5deg and -45deg, whereas only both "symmetric" angles were studied for its slightly rough counterpart with ks/D= 1x10^-3. First-time experimental proof is given that, within the accuracy of the data, no significant variation with Reynolds number occurs for all mean and fluctuating aerodynamic coefficients of smooth square prisms up to Reynolds numbers as high as O(107). This Reynolds-number independent behaviour applies to the Strouhal number and the wake profile as well. In contrast to what is known from square prisms with rounded edges and circular cylinders, an increase in surface roughness height by a factor 25 on the current sharp-edged square prism does not lead to any notable effects on the surface boundary layer and thus on the prism's aerodynamics. For both prisms, distinct changes in the aerostatics between the various angles of incidence are seen to take place though.

Item URL in elib:https://elib.dlr.de/141240/
Document Type:Article
Title:Aerodynamics of smooth and rough square-section prisms at incidence in very high Reynolds-number cross-flows
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
van Hinsberg, NilsNils.vanHinsberg (at) dlr.dehttps://orcid.org/0000-0001-7411-333X
Date:1 March 2021
Journal or Publication Title:Experiments in Fluids
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1007/s00348-021-03143-5
Page Range:pp. 1-17
Publisher:Springer
ISSN:0723-4864
Status:Published
Keywords:Square prism, Reynolds number, Sharp edges, Wind tunnel, Flow separation, Bluff body, Surface roughness, Aerodynamics
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Components and Systems
DLR - Research area:Aeronautics
DLR - Program:L CS - Components and Systems
DLR - Research theme (Project):L - Aircraft Systems
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Aeroelastic Experiments
Deposited By: van Hinsberg, Dr. Ir. Nils
Deposited On:15 Mar 2021 08:20
Last Modified:15 Mar 2021 08:20

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