Aeroacoustic analysis of a NACA 0015 airfoil with Gurney flap based on time-resolved PIV measurements

Aeroacoustic analysis of a NACA 0015 airfoil with Gurney flap based on time-resolved PIV measurements

Zhang, Xueqing
Sciacchitano, A. (TU Delft Aerodynamics)
Pröbsting, S. (TU Delft Wind Energy)

von Estorff, O. (editor)
Kropp, W. (editor)
Schulte-Fortkamp, B. (editor)

2016-08-21

The present study investigates the feasibility of high-lift devices noise prediction based on measurements of time-resolved particle image velocimetry (TR-PIV). The model under investigation is a NACA 0015 airfoil with Gurney flap with height of 6% chord length. The velocity fields around and downstream the Gurney flap are measured by PIV and are used for the PIV-based noise predictions. The predictions are assessed via microphone measurements. Since the Gurney flap height is much smaller than the emitted acoustic wavelength, the source of noise can be considered compact and the integral implementation of Curle's analogy based on the unsteady aerodynamic loads can be followed. The results are compared with the simultaneous microphone measurements in terms of time histories and power spectra. The integral formulation of Curle's analogy yields acoustic sound pressure levels in good agreement with the simultaneous microphone measurements for the tonal component. All the calculated far-field noise power spectra reproduce the peak at vortex shedding frequency, which also agrees well with the microphone measurements.

Curle's aeroacoustic analogy
Gurney flap noise
Time-resolved PIV

http://resolver.tudelft.nl/uuid:691341cb-8e57-4b85-9679-daa78e889a1a

German Acoustical Society (DEGA)

978-3-939296-11-9

Proceedings of the INTER-NOISE 2016 - 45th International Congress and Exposition on Noise Control Engineering: Towards a Quieter Future

Inter-Noise 2016, 2016-08-21 → 2016-09-24, Hamburg, Germany

Institutional Repository

conference paper

© 2016 Xueqing Zhang, A. Sciacchitano, S. Pröbsting