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Cross-spectral analysis of PSP images for estimation of surface pressure spectra corrupted by the shot noise

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Abstract

We proposed applying the cross-spectrum analysis to the unsteady pressure-sensitive paint (PSP) images to eliminate the electronic shot noise component from the pressure fluctuation spectrum. The data of surface pressure fluctuation behind a square cylinder which measured by means of the polymer/ceramic PSP with a frequency response of approximately 5 kHz which is sufficiently high for studying the Kármán vortex shedding was used for the validation of this analysis method. The cross spectrum is compared with the auto-spectrum of PSP images and that of the Kulite pressure transducer that corresponds to the reference signal. The cross spectrum can drastically reduce the electronic shot noise component in the pressure fluctuation spectrum. The second peak of vortex shedding which is not observed in the result of auto-spectrum can be observed thanks to the noise reduction. The convergence of calculation is faster as the size of the spatial area for calculating cross spectrum increases.

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Acknowledgements

This study was supported by JST Presto Grant No. JPMJPR1678.

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Authors and Affiliations

  1. Department of Aerospace Engineering, Graduate School of Engineering, Tohoku University, 6-6-01 Aramaki Aza Aoba, Aoba-ku, Sendai, Miyagi, 980-8579, Japan

    Yuta Ozawa, Taku Nonomura & Keisuke Asai

  2. Presto, JST, Sendai, Miyagi, 980-8579, Japan

    Taku Nonomura

  3. Université de Lyon, École Centrale de Lyon et LMFA UMR CNRS 5509, 69134, Ecully, France

    Bertrand Mercier, Thomas Castelain & Christophe Bailly

Authors
  1. Yuta Ozawa
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  2. Taku Nonomura
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  3. Bertrand Mercier
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  4. Thomas Castelain
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  5. Christophe Bailly
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  6. Keisuke Asai
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Correspondence to Yuta Ozawa.

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Ozawa, Y., Nonomura, T., Mercier, B. et al. Cross-spectral analysis of PSP images for estimation of surface pressure spectra corrupted by the shot noise. Exp Fluids 60, 135 (2019). https://doi.org/10.1007/s00348-019-2776-4

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  • DOI: https://doi.org/10.1007/s00348-019-2776-4

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