Uncertainty and validation of unsteady pressure-sensitive paint measurements of acoustic fields under aero engine-like conditions

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review

Autoren

  • Jan Goessling
  • Felix Fischer
  • Joerg R. Seume
  • Michael Hilfer

Organisationseinheiten

Externe Organisationen

  • Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)
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Details

OriginalspracheEnglisch
Aufsatznummer22
FachzeitschriftExperiments in fluids
Jahrgang64
Ausgabenummer2
PublikationsstatusVeröffentlicht - 24 Jan. 2023

Abstract

Abstract: Fast response pressure-sensitive paint (PSP) allows optical measurements of pressure fluctuations on a surface with high spatial and temporal resolution. This technique is evaluated for aeroacoustic measurements inside an aeroacoustic wind tunnel (AWT). The AWT is a test rig especially designed for investigating the excitation and propagation of sound under conditions typical for turbomachinery. The aim of this work is to compare the results of sound pressure measurements of tonal sound fields in a circular duct conducted with PSP and microphone arrays in order to assess the applicability of PSP in turbomachinery acoustics applications. A data analysis process is presented, which projects the camera image of the PSP data onto a given surface. To analyze the spatial pressure fluctuations, the PSP data are transformed in the frequency domain using pixel-wise fast Fourier transform. Measurements with a mean Mach number up to 0.109 and 5 kHz excitation frequency are conducted. An acoustic mode generator is used to excite the sound field with specific circumferential mode order. The pressure fluctuations obtained with the PSP measurement visualize the measured acoustic field well and allow early interpretation. The pressures of PSP and microphones are in good agreement; for example, the maximum detected deviation in pressure at 2700 Hz is 30 Pa. A preview on using radial mode analysis to decompose the acoustic field, measured by PSP, into acoustic modes is provided. The results are confirmed by a decomposition using conventional arrays of flush-mounted microphones. Graphical Abstract: [Figure not available: see fulltext.]

ASJC Scopus Sachgebiete

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Uncertainty and validation of unsteady pressure-sensitive paint measurements of acoustic fields under aero engine-like conditions. / Goessling, Jan; Fischer, Felix; Seume, Joerg R. et al.
in: Experiments in fluids, Jahrgang 64, Nr. 2, 22, 24.01.2023.

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review

Goessling J, Fischer F, Seume JR, Hilfer M. Uncertainty and validation of unsteady pressure-sensitive paint measurements of acoustic fields under aero engine-like conditions. Experiments in fluids. 2023 Jan 24;64(2):22. doi: 10.1007/s00348-022-03558-8
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title = "Uncertainty and validation of unsteady pressure-sensitive paint measurements of acoustic fields under aero engine-like conditions",
abstract = "Abstract: Fast response pressure-sensitive paint (PSP) allows optical measurements of pressure fluctuations on a surface with high spatial and temporal resolution. This technique is evaluated for aeroacoustic measurements inside an aeroacoustic wind tunnel (AWT). The AWT is a test rig especially designed for investigating the excitation and propagation of sound under conditions typical for turbomachinery. The aim of this work is to compare the results of sound pressure measurements of tonal sound fields in a circular duct conducted with PSP and microphone arrays in order to assess the applicability of PSP in turbomachinery acoustics applications. A data analysis process is presented, which projects the camera image of the PSP data onto a given surface. To analyze the spatial pressure fluctuations, the PSP data are transformed in the frequency domain using pixel-wise fast Fourier transform. Measurements with a mean Mach number up to 0.109 and 5 kHz excitation frequency are conducted. An acoustic mode generator is used to excite the sound field with specific circumferential mode order. The pressure fluctuations obtained with the PSP measurement visualize the measured acoustic field well and allow early interpretation. The pressures of PSP and microphones are in good agreement; for example, the maximum detected deviation in pressure at 2700 Hz is 30 Pa. A preview on using radial mode analysis to decompose the acoustic field, measured by PSP, into acoustic modes is provided. The results are confirmed by a decomposition using conventional arrays of flush-mounted microphones. Graphical Abstract: [Figure not available: see fulltext.]",
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N1 - Funding Information: Parts of this project have received funding from the Clean Sky 2 Joint Undertaking (JU) under grant agreement No. 864256. The JU receives support from the European Union’s Horizon 2020 research and innovation program and the Clean Sky 2 JU members other than the Union. This is gratefully acknowledged by the authors. The authors would also like to express their sincere gratitude to Tim Willuweit for his assistance in preparing and performing the measurements in setup 1.

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