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Analysis of hot-wire anemometry data in an acoustically excited turbulent flow field

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Abstract

This paper describes measurements undertaken on an isothermal facility to study the effects of acoustic excitation on the flow field issuing from gas turbine style fuel injectors. The highly swirling and turbulent flow field is excited with plane acoustic waves generated by loudspeakers. Emphasis is placed on the accuracy of the measured response, over the range of excitation frequencies (50–1,500 Hz), and its possible contamination by the background turbulence. Simulated data are used to assess the experimental accuracy and the established errors, using this technique, are compared with an example set of results.

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Abbreviations

C :

Coherence

D :

Injector diameter

f :

Frequency

G :

Power spectral coefficients

H :

Frequency response function

ΔP :

Pressure drop across fuel injector (time averaged)

p′ac :

Acoustic fluctuating (rms) pressure

r :

Radius

Tu:

Turbulence intensity (u′/U)

U :

Velocity (time averaged)

u′ex :

Fluctuating (rms) velocity response to applied excitation

u′ac :

Acoustic fluctuating (rms) velocity

u′qs :

Fluctuating (rms) quasi-steady velocity (Eq. 1)

u′sim :

Simulated fluctuating (rms) velocity

X :

Axial coordinate

HWA:

Hot wire anemometer

1:

Reference pressure signal

2:

Velocity signal

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Acknowledgements

The authors would like to acknowledge the financial support of the European Union under the MUSCLES framework 5 programme (contract number GRD1-2001-40198). In addition the authors would also like to acknowledge the advice of Alex Riley and Jeff Eldridge (formerly of Cambridge University) for advice on using the two-microphone technique along with some example software.

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Authors and Affiliations

  1. Department of Aeronautical and Automotive Engineering, Loughborough University, Loughborough, Leicestershire, LE11 3TU, UK

    A. Barker, J. Carrotte & P. Denman

Authors
  1. A. Barker
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  2. J. Carrotte
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  3. P. Denman
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Correspondence to J. Carrotte.

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Barker, A., Carrotte, J. & Denman, P. Analysis of hot-wire anemometry data in an acoustically excited turbulent flow field. Exp Fluids 39, 1061–1070 (2005). https://doi.org/10.1007/s00348-005-0039-z

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  • DOI: https://doi.org/10.1007/s00348-005-0039-z

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