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Evaluation of Integral Forces and Pressure Fields from Planar Velocimetry Data for Incompressible and Compressible Flows

Oudheusden, Bas W. van and Scarano, Fulvio and Roosenboom, Eric and Casimiri, Eric W. F. and Souverein, Louis J. (2007) Evaluation of Integral Forces and Pressure Fields from Planar Velocimetry Data for Incompressible and Compressible Flows. Experiments in Fluids (2007) (Vol. 43), pp. 153-162. Springer-Verlag Berlin, Heidelberg. DOI: 10.1007/s00348-007-0261-y. ISSN 0723-4864 (Print) 1432-114 (Online).

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Abstract

The approach to determine pressure fields and integral loads from planar velocimetry data is discussed, in relation to the implementation for incompressible and compressible flows around two-dimensional objects. The method relies upon the application of control-volume approaches in combination with the deduction of the pressure field from the experimental data, by making use of the flow constitutive equations. In this paper the implementation for two specific application areas is addressed. The first is time-mean pressure field and force evaluation from velocity ensemble statistics, as obtained from time-uncorrelated PIV acquisition, for incompressible flow. Two test cases are considered for this flow regime: the unsteady vortical flow around a square section cylinder at incidence, as well as the force characterization of a low-speed airfoil. The second topic considers the extension of the method to steady compressible flow, with the supersonic flow around a bi-convex airfoil as experimental test case. As in this flow regime the density appears as an extra unknown in the momentum equation, additional flow equations need to be invoked. A convenient approach for this was found, using the gas law and the adiabatic flow condition, with which the pressure-integration procedure becomes essentially the same as for the incompressible case.

Document Type:Article
Additional Information:EiF-0218-2006
Title:Evaluation of Integral Forces and Pressure Fields from Planar Velocimetry Data for Incompressible and Compressible Flows
Authors:
AuthorsInstitution or Email of Authors
Oudheusden, Bas W. vanTU-Delft, Delft, NL
Scarano, FulvioTU-Delft, Delft, NL
Roosenboom, EricUNSPECIFIED
Casimiri, Eric W. F.TU-Delft, Delft, NL
Souverein, Louis J.TU-Delft, Delft, NL
Date:2007
Journal or Publication Title:Experiments in Fluids (2007)
Refereed publication:Yes
In ISI Web of Science:Yes
DOI:10.1007/s00348-007-0261-y
Page Range:pp. 153-162
Publisher:Springer-Verlag Berlin, Heidelberg
ISSN:0723-4864 (Print) 1432-114 (Online)
Status:Published
Keywords:aerodynamic testing, airfoils, bluff body aerodynamics, compressible flow, flow-structure interaction, particle image velocimetry
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Ilka Micknaus
Deposited On:27 Jul 2007
Last Modified:27 Apr 2009 13:17

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