Airfoil Self-Noise - Investigation with Particle Image Velocimetry

Doctoral thesis (2015)

Authors

Contributors

F. Scarano (promotor)
Department
Aerodynamics, Wind Energy, Flight Performance and Propulsion (Aerospace Engineering) (TU Delft)
Copyright: © 2015 Pröbsting, S.
Fluid mechanics Particle image velocimetry Aeroacoustics Trailing edge noise Airfoil self-noise
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Published Date

01-10-2015

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ISBN:

9789461865236

Faculty

Aerospace Engineering

Department

Aerodynamics, Wind Energy, Flight Performance and Propulsion

Abstract

Noise generated aerodynamically by the airflow over a lifting surface is often of concern for applications as diverse as air and ground transportation, heating, ventilation, air-conditioning systems, and wind turbines. The thesis describes the application of advanced optical flow measurements techniques for the visualization and description of the sources of sound on airfoils. These measurement techniques include high-speed stereoscopic and tomographic Particle Image Velocimetry (PIV) together with advanced methods for post-processing to obtain a representation of the aeroacoustic source field. Following this innovative and evolving approach in experimental aeroacoustics, a novel methodology for broadband trailing-edge noise diagnostics by tomographic PIV is proposed. Moreover, on the basis of simultaneous high-speed PIV and acoustic measurements, new and fundamental insights into the mechanism of tonal noise generation due to the interaction of amplified laminar boundary layer instability waves with the trailing edge are presented. Both examples demonstrate the potential impact of advanced PIV methods on present and future research in experimental aeroacoustics.