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Obtaining phase velocity of turbulent boundary layer pressure fluctuations at high subsonic Mach number from wind tunnel data affected by strong background noise
Citation key HaxterBrouverSesterhennSpehr2017
Author Stefan Haxter and Jens Brouwer and Jörn Sesterhenn and Carsten Spehr
Pages 85 - 103
Year 2017
ISSN 0022-460X
DOI https://doi.org/10.1016/j.jsv.2017.05.011
Journal Journal of Sound and Vibration
Volume 402
Abstract Abstract Boundary layer measurements at high subsonic Mach number are evaluated in order to obtain the dominant phase velocities of boundary layer pressure fluctuations. The measurements were performed in a transonic wind tunnel which had a very strong background noise. The phase velocity was taken from phase inclination and from the convective peak in one- and two-dimensional wavenumber spectra. An approach was introduced to remove the acoustic noise from the data by applying a method based on CLEAN-SC on the two-dimensional spectra, thereby increasing the frequency range where information about the boundary layer was retrievable. A comparison with prediction models showed some discrepancies in the low-frequency range. Therefore, pressure data from a \DNS\ calculation was used to substantiate the results of the analysis in this frequency range. Using the measured data, the \DNS\ results and a review of the models used for comparison it was found that the phase velocity decreases at low frequencies.
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