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Coherence of wall pressure fluctuations in zero and adverse pressure gradients

Hu, Nan (2021) Coherence of wall pressure fluctuations in zero and adverse pressure gradients. Journal of Sound and Vibration. Elsevier. doi: 10.1016/j.jsv.2021.116316. ISSN 0022-460X.

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Kurzfassung

The wall pressure fluctuations induced by turbulent boundary layers on a flat plate model were measured with an L-shaped array of Kulite miniature pressure sensors. By installing a NACA airfoil above the plate with an adjustable angle of attack, different adverse pressure gradients were produced on the plate. The streamwise and spanwise coherence and coherence lengths of the wall pressure fluctuations are calculated for zero and adverse pressure gradient flows. The effect of the pressure gradient on the coherence and coherence lengths in both streamwise and spanwise directions is quantified. Based on the results of the present test cases and selected published datasets in zero pressure gradients, covering the range of Reynolds numbers based on the momentum thickness between 3300 and 42000, the Reynolds number dependence of the streamwise wall pressure coherence is discussed and mathematically expressed. A coherence length model for zero pressure gradient boundary layers, taking into account the Reynolds number effect, is proposed based on scaled spectra of the coherence lengths. In comparison with the other published models, the present model achieves a considerable improvement of the prediction accuracy for boundary layer flows, covering a large range of Reynolds numbers. Furthermore, an evaluation of the Corcos model and the Smol’yakov and Tkachenko model for prediction of the off-axis coherence of the fluctuating wall pressure field is made.

elib-URL des Eintrags:https://elib.dlr.de/143109/
Dokumentart:Zeitschriftenbeitrag
Titel:Coherence of wall pressure fluctuations in zero and adverse pressure gradients
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Hu, NanNan.Hu (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:1 Juli 2021
Erschienen in:Journal of Sound and Vibration
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
DOI:10.1016/j.jsv.2021.116316
Verlag:Elsevier
ISSN:0022-460X
Status:veröffentlicht
Stichwörter:Wall pressure coherence, Coherence length model, Adverse pressure gradients
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Komponenten und Systeme
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L CS - Komponenten und Systeme
DLR - Teilgebiet (Projekt, Vorhaben):L - Wartung und Kabine
Standort: Braunschweig
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Leitungsbereich AS BS
Hinterlegt von: Hu, Nan
Hinterlegt am:13 Jul 2021 07:34
Letzte Änderung:20 Okt 2023 08:29

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