Development and Testing of an Aeroacoustic Wind Tunnel Test Section
Abstract
A new aeroacoustic wind tunnel test section is developed and tested at Carleton University. The aeroacoustic test section is fitted with two anechoic chambers on the two side walls. Side walls of the test section are lined with acoustic transparency tensioned cloth screens, which act as an interface between the test section and the anechoic chambers to provide a smooth flow surface while eliminating the need for a jet catcher and reducing interference effects. The test section is tested in the medium speed closed-loop wind tunnel at Carleton University. The design layout of the wind tunnel and design treatments to improve acoustic performance are discussed. Experiments are conducted to verify the acoustic performance of the developed aeroacoustic wind tunnel test section. It is found that background noise is comparable with other existing aeroacoustic wind tunnel facilities. The trailing edge noise of a NACA0012 airfoil model is also measured as a benchmark test. Results reveal that noise radiated from the airfoil trailing edge model are adequately higher than the background noise for a wide frequency range, and also that a sawtooth serrated trailing edge is effective for reducing noise compared to a straight trailing edge.
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