NDLI: The Effect of Flow Coefficient on the Self Noise Generated by a Ducted Rotor

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	David, B. Stephens Scott, C. Morris William, K. Blake
Copyright Year	2008
Abstract	Sound generation in low Mach number turbomachines is typically dominated by unsteady fluid forces on rigid surfaces. As a result, the radiated sound is closely related to the unsteady flow field. The present study focused on the self noise that is generated by a ducted rotor separate from the effect of noise due to inflow turbulence. The flow rate through the rotor was independently varied in order change the mean lift on the blades. Measurements of the flow field around a ducted rotor were found to provide insight to the various mechanisms of sound that are present at different mean loading conditions. At lower flow rates the blades were partially stalled, resulting in significantly increased noise levels. The measurements included rotor wake measurements using hot-wire anemometry and far field sound. A simple model to predict the radiated self noise based on the hot-wire measurements is presented.
Sponsorship	Noise Control and Acoustics Division
Starting Page	59
Ending Page	67
Page Count	9
File Format	PDF
ISBN	0791848396
DOI	10.1115/NCAD2008-73029
e-ISBN	0791838307
Conference Proceedings	ASME 2008 Noise Control and Acoustics Division Conference
Language	English
Publisher Date	2008-07-28
Publisher Place	Dearborn, Michigan, USA
Access Restriction	Subscribed
Subject Keyword	Noise (sound) Fluids Turbulence Blades Rotors Wakes Turbomachinery Unsteady flow Wire Inflow Flow (dynamics) Mach number
Content Type	Text
Resource Type	Article

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