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Experimental investigation of rotor broadband self noise by means of rotating controlled diffusion blades

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VKI PHDT 2002-01, Mike Bilka, Experimental investigation of rotor broadband self noise by means of rotating controlled diffusion blades, ISBN 978-2-87516-021-8, 231 pgs

Experimental investigation of rotor broadband self noise by mean

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Experimental investigation of rotor broadband self noise by means of rotating controlled diffusion blades

By Mike Bilka

PhD Thesis from the von Karman Institute/Vrije Universiteit Brussel, October 2011, ISBN 978-2-87516-021-8, 231 pgs

Abstract


An experimental investigation has been performed to evaluate the aeroacoustic self noise of a new simplified fan design (RCDB) for aeroacoustic self noise investigations. To reach this objective, a novel low speed aeroacoustic wind tunnel dedicated to the study of axial flow fans has been designed and constructed within the framework of this thesis. This wind tunnel has been found suitable for the investigation of broadband self noise due to its low inflow turbulence levels and its compliance to ISO acoustic measurement chamber standards from 150Hz to 10kHz. Aerodynamic wake and performance measurements are made to assess the flow character and potential aerodynamic noise sources. These measurements, performed for different solidities and blade loadings including off design conditions, also revealed additional flow features that are absent in conventional fan measurements. The far field spectra of the fan is measured for the same conditions as the aerodynamic measurements. It has been found to have a broadband character that is consistent with that of trailing edge noise at the optimal operating point. The small aspect ratio is found to cause the fan acoustic spectra to be dominated by tip separation at off-optimum operating conditions. Consideration is also made for surface pressure models to be used as inputs for trailing edge noise prediction theory. Different surface pressure models available in the literature as well as models based on experimental data have been compared. Additional consideration is made for the noise associated with tip leakage flow.

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Manufacturer von Karman Institute for Fluid Dynamics

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