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Obtaining accurate mean velocity measurements in high Reynolds number turbulent boundary layers using Pitot tubes

Published online by Cambridge University Press:  09 January 2013

S. C. C. Bailey*
Affiliation:
Department of Mechanical Engineering, University of Kentucky, Lexington, KY 40506, USA
M. Hultmark
Affiliation:
Deparment of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544, USA
J. P. Monty
Affiliation:
Department of Mechanical Engineering, The University of Melbourne, Victoria 3010, Australia
P. H. Alfredsson
Affiliation:
Linné FLOW Centre, KTH Mechanics, SE-100 44 Stockholm, Sweden
M. S. Chong
Affiliation:
Department of Mechanical Engineering, The University of Melbourne, Victoria 3010, Australia
R. D. Duncan
Affiliation:
Illinois Institute of Technology, Chicago, IL 60616, USA
J. H. M. Fransson
Affiliation:
Linné FLOW Centre, KTH Mechanics, SE-100 44 Stockholm, Sweden
N. Hutchins
Affiliation:
Department of Mechanical Engineering, The University of Melbourne, Victoria 3010, Australia
I. Marusic
Affiliation:
Department of Mechanical Engineering, The University of Melbourne, Victoria 3010, Australia
B. J. McKeon
Affiliation:
Graduate Aeronautical Laboratories, California Institute of Technology, Pasadena, CA 91125, USA
H. M. Nagib
Affiliation:
Illinois Institute of Technology, Chicago, IL 60616, USA
R. Örlü
Affiliation:
Linné FLOW Centre, KTH Mechanics, SE-100 44 Stockholm, Sweden
A. Segalini
Affiliation:
Linné FLOW Centre, KTH Mechanics, SE-100 44 Stockholm, Sweden II Facoltà di Ingegneria, Università di Bologna, I-47100 Forlí, Italy
A. J. Smits
Affiliation:
Deparment of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544, USA
R. Vinuesa
Affiliation:
Illinois Institute of Technology, Chicago, IL 60616, USA
*
Email address for correspondence: scbailey@engr.uky.EDU

Abstract

This article reports on one component of a larger study on measurement of the zero-pressure-gradient turbulent flat plate boundary layer, in which a detailed investigation was conducted of the suite of corrections required for mean velocity measurements performed using Pitot tubes. In particular, the corrections for velocity shear across the tube and for blockage effects which occur when the tube is in close proximity to the wall were investigated using measurements from Pitot tubes of five different diameters, in two different facilities, and at five different Reynolds numbers ranging from ${\mathit{Re}}_{\theta } = 11\hspace{0.167em} 100$ to 67 000. Only small differences were found amongst commonly used corrections for velocity shear, but improvements were found for existing near-wall proximity corrections. Corrections for the nonlinear averaging of the velocity fluctuations were also investigated, and the results compared to hot-wire data taken as part of the same measurement campaign. The streamwise turbulence-intensity correction was found to be of comparable magnitude to that of the shear correction, and found to bring the hot-wire and Pitot results into closer agreement when applied to the data, along with the other corrections discussed and refined here.

Type
Papers
Copyright
©2013 Cambridge University Press

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