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Erschienen in: Experiments in Fluids 8/2019

01.08.2019 | Letter

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

verfasst von: Yuta Ozawa, Taku Nonomura, Bertrand Mercier, Thomas Castelain, Christophe Bailly, Keisuke Asai

Erschienen in: Experiments in Fluids | Ausgabe 8/2019

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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.

Graphic abstract

Literatur
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Metadaten
Titel
Cross-spectral analysis of PSP images for estimation of surface pressure spectra corrupted by the shot noise
verfasst von
Yuta Ozawa
Taku Nonomura
Bertrand Mercier
Thomas Castelain
Christophe Bailly
Keisuke Asai
Publikationsdatum
01.08.2019
Verlag
Springer Berlin Heidelberg
Erschienen in
Experiments in Fluids / Ausgabe 8/2019
Print ISSN: 0723-4864
Elektronische ISSN: 1432-1114
DOI
https://doi.org/10.1007/s00348-019-2776-4

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