A detailed procedure for measuring turbulent velocity fluctuations using constant-voltage anemometry

The knowledge of temperature fluctuations is essential for most thermoacoustic systems. In the present paper, cold wire constant-voltage anemometry (CVA) to measure temperature fluctuations is presented. Corrections for the thermal inertia and for the end losses of the wire are applied during the post-processing. The correction for the thermal inertia of the cold wire is achieved by applying a time dependent thermal lag as proposed originally for a constant-current anemometry (CCA) system. This thermal lag is measured in parallel by a hot wire. The thermal end losses of the wires to their supports are also considered and approximate corrections are proposed. The procedure for the cold wire CVA is validated in the acoustic field of an acoustic resonator with wires of different lengths. A comparison between a CVA and a CCA measurement also confirms the CVA measurement. Furthermore, the proposed measurement procedure is applied close to the stack of a thermoacoustic refrigerator. Supposing a two-dimensional flow, the simultaneous measurement of velocity and temperature fluctuations is possible. This allows a detailed examination of the acoustic field close to the stack, including the study of the correlation between temperature and velocity.

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“…See Ref. 11 for more details. The time constant M CVA is equal to the time at which the signal has decayed by 63% and it is given for CVA by…”

Section: A Correction Of the Thermal Inertia Of A Wirementioning

confidence: 99%

Cold wire constant voltage anemometry to measure temperature fluctuations and its application in a thermoacoustic system

Cleve

Jondeau

Blanc‐Benon

et al. 2017

Review of Scientific Instruments

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“…In order to analyze the structure of the instantaneous temperature field we have developed a new thermal anemometry technique using a constant-voltage anemometer (CVA) prototype 3,4,5 . This technique is well adapted to unsteady and oscillating flows as the thermal lag of the sensors is corrected instantaneously.…”

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confidence: 99%

Analysis of the acoustic field in a thermoacoustic system using time-resolved particle image velocimetry and constant-voltage anemometry

Blanc‐Benon

Jondeau²,

Comte-Bellot³

2015

Proceedings of the 3rd International Workshop on Thermoacoustics

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Realization of Constant Voltage Anemometer Using an Alternative Signal Conditioning Circuit

2020

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A detailed procedure for measuring turbulent velocity fluctuations using constant-voltage anemometry

Abstract: International audienceno abstrac

Cited by 4 publications

References 27 publications

Cold wire constant voltage anemometry to measure temperature fluctuations and its application in a thermoacoustic system

Cold wire constant voltage anemometry to measure temperature fluctuations and its application in a thermoacoustic system

Analysis of the acoustic field in a thermoacoustic system using time-resolved particle image velocimetry and constant-voltage anemometry

Realization of Constant Voltage Anemometer Using an Alternative Signal Conditioning Circuit

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