TY - JOUR

T1 - A new set-up for PIV measurements in rotating turbulent duct flows

AU - Visscher, Jan

AU - Andersson, Helge I.

AU - Barri, Mustafa

AU - Didelle, Henri

AU - Viboud, Samuel

AU - Sous, Damien

AU - Sommeria, Jol

N1 - Funding Information: We appreciate the constructive discussions with Dr. B.A. Pettersson Reif at The Norwegian Defence Research Establishment (FFI) in the planning stage of this project. The work described in this publication was supported by the European Community’s Sixth Framework Programme through the grant to the budget of the Integrated Infrastructure Initiative HYDRALAB III, Contract no. 022441 (RII3) and by the Research Council of Norway through a research grant Contract no. 171725/V30 which includes a Ph.D. research fellowship (M. Barri).

PY - 2011/3

Y1 - 2011/3

N2 - A novel set-up designed for flow visualizations and turbulence measurements in rotating high-aspect-ratio ducts has been described. The 8 m long duct was placed across a 13 m diameter turntable and the set-up enabled stereoscopic PIV-measurements over a wide range of rotation numbers Ro≡2ΩH/U≤0.80. Measurements of all three components of the instantaneous velocity vector were made in a plane spanning the channel from the pressure to the suction side. Together with the mean flow characteristics, the important turbulence statistics, such as all components of the Reynolds stress tensor and the spanwise component of the vorticity field, were obtained and compared to DNS results. The field measurements provided more details about the flow than earlier experimental studies of turbulent flows in rotating ducts.The overall observation was that the Coriolis force due to the imposed system rotation damped the turbulence level along the suction side whereas an augmentation of the turbulent agitation was found at the pressure side of the rotating channel. These findings are fully consistent with data from earlier DNS studies. The same set-up can readily be used to explore the influence of rotation on internal flows with separation bubbles provoked by massive obstructions, for instance turbulent flows over a backward-facing step or in ducts with transverse ribs of various shapes.

AB - A novel set-up designed for flow visualizations and turbulence measurements in rotating high-aspect-ratio ducts has been described. The 8 m long duct was placed across a 13 m diameter turntable and the set-up enabled stereoscopic PIV-measurements over a wide range of rotation numbers Ro≡2ΩH/U≤0.80. Measurements of all three components of the instantaneous velocity vector were made in a plane spanning the channel from the pressure to the suction side. Together with the mean flow characteristics, the important turbulence statistics, such as all components of the Reynolds stress tensor and the spanwise component of the vorticity field, were obtained and compared to DNS results. The field measurements provided more details about the flow than earlier experimental studies of turbulent flows in rotating ducts.The overall observation was that the Coriolis force due to the imposed system rotation damped the turbulence level along the suction side whereas an augmentation of the turbulent agitation was found at the pressure side of the rotating channel. These findings are fully consistent with data from earlier DNS studies. The same set-up can readily be used to explore the influence of rotation on internal flows with separation bubbles provoked by massive obstructions, for instance turbulent flows over a backward-facing step or in ducts with transverse ribs of various shapes.

KW - Duct flow

KW - PIV

KW - Rotation

KW - Turbulence

UR - http://www.scopus.com/inward/record.url?scp=78751701269&partnerID=8YFLogxK

U2 - 10.1016/j.flowmeasinst.2010.12.006

DO - 10.1016/j.flowmeasinst.2010.12.006

M3 - Article

AN - SCOPUS:78751701269

VL - 22

SP - 71

EP - 80

JO - Flow Measurement and Instrumentation

JF - Flow Measurement and Instrumentation

SN - 0955-5986

IS - 1

ER -