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Static and dynamic calibrations of constant-temperature hot-wire systems

Published online by Cambridge University Press:  29 March 2006

A. E. Perry  and
G. L. Morrison
A. E. Perry
Affiliation:
Department of Mechanical Engineering, University of Melbourne
G. L. Morrison
Affiliation:
Department of Mechanical Engineering, University of Melbourne
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Abstract

The conventional hot-wire static calibration procedure for the measurement of absolute turbulence intensities with constant-temperature hot-wire anemometers is investigated and serious errors are found. An alternative calibration procedure is developed which involves shaking the wire at low frequencies in a uniform flow. A series of tests indicate that this dynamic calibration method is more accurate and consistent than the conventional procedure.

A method for verifying various calibration procedures is demonstrated. This method involves the measurement of velocity perturbations in a series of Karman vortex streets. The velocity perturbation amplitude is held fixed, but the frequency varies from one vortex street to another. This method also acts as a direct check of the hot-wire system frequency response.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 47 , Issue 4 , 29 June 1971 , pp. 765 - 777
Copyright
© 1971 Cambridge University Press

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