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Boundary layer measurements of the NACA0015 and implications for noise modeling

Abstract

A NACA0015 airfoil section instrumented with an array of high frequency microphones flush-mounted beneath its surface was measured in the wind tunnel at LM Wind Power in Lunderskov. Various inflow speeds and angles of attack were investigated. In addition, a hot-wire device system was used to measure the velocity profiles and turbulence characteristics in the boundary layer near the trailing edge of the airfoil. The measured boundary layer data are presented in this report and compared with CFD results. A relative good agreement is observed, though a few discrepancies also appear. Comparisons of surface pressure fluctuations spectra are used to analyze and improve trailing edge noise modeling by the so-called TNO model. Finally, a pair of hot-wires were placed on each side of the trailing edge in order to measure the radiated trailing edge noise. However, there is no strong evidence that such noise could be measured in the higher frequency range. Nevertheless, low-frequency noise could be measured and related to the presence of the airfoil but its origin is unclear. (Author)
Authors:
Publication Date:
Jan 15, 2011
Product Type:
Technical Report
Report Number:
RISO-R-1761(EN)
Resource Relation:
Other Information: EUDP-2009-2; 2 tabs, 23 refs.
Subject:
17 WIND ENERGY; WIND TURBINES; AIRFOILS; TURBINE BLADES; NOISE; ACOUSTIC MEASUREMENTS; BOUNDARY LAYERS; MEASURING METHODS
OSTI ID:
1004722
Research Organizations:
Technical Univ. of Denmark, Risoe National Lab. for Sustainable Energy. Wind Energy Div., Roskilde (Denmark)
Country of Origin:
Denmark
Language:
English
Other Identifying Numbers:
Other: Contract ENS-64009-0272; ISBN 978-87-550-3656-7; TRN: DK1101018
Availability:
Also available at http://www.risoe.dtu.dk/rispubl/reports/ris-r-1761.pdf; OSTI as DE01004722
Submitting Site:
DK
Size:
66 p. pages
Announcement Date:
Feb 14, 2011

Citation Formats

Bertagnolio, F. Boundary layer measurements of the NACA0015 and implications for noise modeling. Denmark: N. p., 2011. Web.
Bertagnolio, F. Boundary layer measurements of the NACA0015 and implications for noise modeling. Denmark.
Bertagnolio, F. 2011. "Boundary layer measurements of the NACA0015 and implications for noise modeling." Denmark.
@misc{etde_1004722,
title = {Boundary layer measurements of the NACA0015 and implications for noise modeling}
author = {Bertagnolio, F}
abstractNote = {A NACA0015 airfoil section instrumented with an array of high frequency microphones flush-mounted beneath its surface was measured in the wind tunnel at LM Wind Power in Lunderskov. Various inflow speeds and angles of attack were investigated. In addition, a hot-wire device system was used to measure the velocity profiles and turbulence characteristics in the boundary layer near the trailing edge of the airfoil. The measured boundary layer data are presented in this report and compared with CFD results. A relative good agreement is observed, though a few discrepancies also appear. Comparisons of surface pressure fluctuations spectra are used to analyze and improve trailing edge noise modeling by the so-called TNO model. Finally, a pair of hot-wires were placed on each side of the trailing edge in order to measure the radiated trailing edge noise. However, there is no strong evidence that such noise could be measured in the higher frequency range. Nevertheless, low-frequency noise could be measured and related to the presence of the airfoil but its origin is unclear. (Author)}
place = {Denmark}
year = {2011}
month = {Jan}
}