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Effect of sensor mounting and flow history on measured wall pressure spectra

Hu, Nan and Erbig, Lars (2020) Effect of sensor mounting and flow history on measured wall pressure spectra. AIAA Journal, 58 (7), pp. 2964-2974. American Institute of Aeronautics and Astronautics (AIAA). doi: 10.2514/1.J057808. ISSN 0001-1452.

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Official URL: https://doi.org/10.2514/1.J057808

Abstract

An experimental study of wall pressure fluctuations beneath a turbulent boundary layer was carried out on aplate model with a streamwise varying pressure gradient along the plate length. The wall pressure fluctuationswere measured with flush-mounted Kulite sensors, and mean velocity measurements across the boundary layerwere performed by using a single-wire hot-wire anemometer. A variety of streamwise pressure distributionswere imposed by changing the position and the angle of attack of a NACA 0012 airfoil installed above theplate. The effect of the upstream flow history on the wall pressure spectra in the presence of the streamwisevarying pressure gradient was studied. Spectral attenuation due to the spatial averaging associated with a finitesensor size was corrected via the Corcos correction. The results show that the Corcos correction to themeasured Kulite spectra leads to an overprediction of the spectral intensity at medium frequencies and anunderprediction at high frequencies. Hence, a new correction is proposed based on the measured spectralattenuation. Finally, the measurements also indicate that even slight imperfections in sensor mounting andrelatively weak upstream flow disturbances can have a significant influence on the measured spectra of the wallpressure fluctuations.

Item URL in elib:https://elib.dlr.de/135954/
Document Type:Article
Title:Effect of sensor mounting and flow history on measured wall pressure spectra
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Hu, NanNan.Hu (at) dlr.deUNSPECIFIED
Erbig, Larslars.erbig (at) daimler.comUNSPECIFIED
Date:14 March 2020
Journal or Publication Title:AIAA Journal
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:58
DOI :10.2514/1.J057808
Page Range:pp. 2964-2974
Editors:
EditorsEmailEditor's ORCID iD
UNSPECIFIEDAIAAUNSPECIFIED
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
ISSN:0001-1452
Status:Published
Keywords:wall pressure spectral distortion, sensor size correction, flow history
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Systems and Cabin (old)
Location: Braunschweig
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Technical Acoustics
Deposited By: Hu, Nan
Deposited On:08 Sep 2020 07:40
Last Modified:05 Nov 2020 14:40

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