NDLI: Near Field Aeroacoustic Experimental Investigation in Low Speed Axial Fans

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Bianchi, Stefano Corsini, Alessandro Rispoli, Franco Anthony, G. Sheard
Copyright Year	2008
Abstract	This paper describes a technique for the investigation of noise sources correlated to tip clearance flows in a low-speed axial fan. A detailed experimental acoustic study is carried out examining the chord-wise evolution of a rotor flow field in the proximity of the blade tip in a low-solidity impeller. The experiment is performed by keeping the rotor “frozen” inside an anechoic chamber. The Mach number, Reynolds number, and blade incidence angle are set in the static frame of reference, reproducing the flow field in the rotating frame. The ‘frozen’ fan rotor is mounted in an anechoic chamber. The near-field pressure perturbations are measured using a chord-traversed microphone. Near-field pressure data is then compared with theoretical predictions, experimental data, and numerical simulations. In this way the validity of the developed experimental scheme is assessed. The purpose of the present program of work is to identify the change in near-field noise as a result of the chord-wise turbulent structures that are located close to the blade surface at the tip. The objective is to study the evolution of turbulent flow structure paths along the chord, and thus to provide insights into their acoustic significance. The present program of work is facilitated by the existence of a detailed pre-existing experimental database on the fan studied.
Sponsorship	Noise Control and Acoustics Division
Starting Page	91
Ending Page	100
Page Count	10
File Format	PDF
ISBN	0791848396
DOI	10.1115/NCAD2008-73039
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	Fans Turbulence Blades Computer simulation Reynolds number Rotors Clearances (engineering) Acoustics Flow (dynamics) Pressure Microphones Noise (sound) Anechoic chambers Databases Impellers Chords (trusses) Mach number
Content Type	Text
Resource Type	Article

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