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# Wall pressure spectra on a DU96-W-180 profile from low to pre-stall angles of attack

Suryadi, Alexandre and Herr, Michaela (2015) Wall pressure spectra on a DU96-W-180 profile from low to pre-stall angles of attack. 21st AIAA/CEAS Aeroacoustics Conference, 22 - 26 June 2015, Dallas, Texas.

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## Abstract

In an effort to characterize noise induced by separated turbulent boundary layers, surface pressure fluctuations on a DU96-W-180 airfoil were measured using miniature pressure sensors. Because of limitation in amplifier channels and available sensors, a rearrangeable configuration of sensors was applied. Chordwise distributions of the surface pressure were obtained for aerodynamic angles of attack of $-0.8^\circ\leq\alpha\leq10.3^\circ$ and at three Reynolds numbers $(0.8, 1.0, and 1.2) \times 10^6$. The boundary layer profile at 1%c behind the trailing edge was measured using constant temperature anemometry. The boundary layer thickness compares well with that simulated using XFOIL for $alpha\leq7.8^\circ�$. Within the limits of the simulation, other relevant boundary layer properties from XFOIL were used to calculate the surface pressure spectrum predicted from published empirical models for zero and non-zero pressure gradient turbulent boundary layers. Finally, a modified Blake-TNO semi-empirical model was used to predict the surface pressure spectrum near the trailing edge for separated flow. The modification is introduced to the so called `moving axis spectrum' and the chord-normal correlation length scale. It is found that in the low frequency range, the modified semi-empirical model �fits well with the measured surface pressure spectrum of a separated turbulent boundary layer.

Item URL in elib:https://elib.dlr.de/97164/
Document Type:Conference or Workshop Item (Speech)
Title:Wall pressure spectra on a DU96-W-180 profile from low to pre-stall angles of attack
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Herr, Michaelamichaela.herr (at) dlr.deUNSPECIFIED
Date:23 June 2015
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:measurements, wall pressure spectra, wind energy, separated flow, flow modeling
Event Title:21st AIAA/CEAS Aeroacoustics Conference
Event Location:Dallas, Texas
Event Type:international Conference
Event Dates:22 - 26 June 2015
Organizer:AIAA
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:other
DLR - Research area:Energy
DLR - Program:E SF - Solar research
DLR - Research theme (Project):E - Wind Energy (old), L - Simulation and Validation
Location: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Technical Acoustics
Deposited By: Suryadi, Alexandre
Deposited On:20 Jul 2015 16:09