Airfoil Self-Noise - Investigation with Particle Image Velocimetry

Airfoil Self-Noise - Investigation with Particle Image Velocimetry

Pröbsting, S.

Scarano, F. (promotor)

Aerospace Engineering

Aerodynamics, Wind Energy, Flight Performance and Propulsion

2015-10-01

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.

aeroacoustics
particle image velocimetry
fluid mechanics
trailing edge noise
airfoil self-noise

http://resolver.tudelft.nl/uuid:8a938547-a829-4a79-b77c-a92633a9652a

2016-08-01

9789461865236

Institutional Repository

doctoral thesis

(c) 2015 Pröbsting, S.