Work

Evaluating the Acoustic Effect of Over-the-Rotor Foam-Metal Liner Installed on a Low Speed Fan Using Virtual Rotating Microphone Imaging

Year: 2010

Type: article

Abstract: An in-duct beamforming technique for imaging rotating broadband fan sources has been used to evaluate the acoustic characteristics of a Foam-Metal Liner installed over-the-rotor of a low-speed fan. The NASA Glenn Research Center s Advanced Noise Control Fan was used as a test bed. A duct wall-mounted phased array consisting of several rings of microphones was employed. The data are mathematically resampled in the fan rotating reference frame and subsequently used in a conventional beamforming technique. The steering vectors for the beamforming technique are derived from annular duct modes, so that effects of reflections from the duct walls are reduced.

Source: NASA STI Repository (National Aeronautics and Space Administration)

Authors: Walker, Bruce E., Dougherty, Robert P., Sutliff, Daniel L.

Institution: Glenn Research Center

Language: English

Topic: Aerodynamics and Acoustics in Jet Flows

Subfield: Aerospace Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: green

Funders: National Aeronautics and Space Administration, Glenn Research Center

OpenAlex ID: W3172521645

FWCI:

Cites: 6

Cited by: 7

Related to: 10