A constant-voltage anemometer is subject to nonlinear effects when the operating hot wire is exposed to large velocity fluctuations in the incident flow. This results in the generation of undesirable higher harmonics, just as in the two classic systems, constant-current and constant-temperature anemometers, for which no attempts are normally made to correct the nonlinearities. The present investigation shows that these undesirable higher harmonics can be suppressed in the case of a constant-voltage anemometer. A new approach to process experimental data is proposed. It is based on three explicit equations established and solved with all terms included, i.e., without linearization. These are (1) the first-order differential equation that describes the electronic circuit of a constant-voltage anemometer—this equation permits to deduce the instantaneous resistance of the hot wire from the output voltage of the anemometer; (2) the first-order differential equation that expresses the thermal lag behavior of the hot wire when used in a constant-voltage mode—this equation permits to restore the instantaneous resistance that an ideal wire would have without thermal inertia in the same flow conditions; and (3) the algebraic relation that expresses the heat-transfer law of an ideal wire, according to King’s law, a look-up table, or a polynomial fit—this relation permits to deduce the instantaneous flow velocity from the instantaneous resistance of the ideal wire. The proposed method is easily implemented on a personal computer and permits odd turbulence moments, such as skewness factors, to be obtained satisfactorily.
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April 2009
Research Article|
April 10 2009
A strategy to eliminate all nonlinear effects in constant-voltage hot-wire anemometry
Arganthaël Berson;
Arganthaël Berson
1Queen’s-RMC Fuel Cell Research Centre,
Queen’s University
, 945 Princess Street, Kingston, Ontario K7L 5L9, Canada
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Philippe Blanc-Benon;
Philippe Blanc-Benon
2Laboratoire de Mécanique des Fluides et d’Acoustique, UMR CNRS 5509,
École Centrale de Lyon
, 36 avenue Guy de Collongue, 69134 Ecully Cedex, France
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Geneviève Comte-Bellot
Geneviève Comte-Bellot
2Laboratoire de Mécanique des Fluides et d’Acoustique, UMR CNRS 5509,
École Centrale de Lyon
, 36 avenue Guy de Collongue, 69134 Ecully Cedex, France
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Rev. Sci. Instrum. 80, 045102 (2009)
Article history
Received:
September 29 2008
Accepted:
March 03 2009
Citation
Arganthaël Berson, Philippe Blanc-Benon, Geneviève Comte-Bellot; A strategy to eliminate all nonlinear effects in constant-voltage hot-wire anemometry. Rev. Sci. Instrum. 1 April 2009; 80 (4): 045102. https://doi.org/10.1063/1.3103948
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