Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 05, 2021 - September 08, 2021
A porous windscreen is used for wind noise reduction in a field measurement, but it cannot sufficiently reduce a low-frequency wind noise. Thus, we study a porous windscreen for low-frequency noise measurement. Low-frequency noise has less directionality, and this allows us to place a microphone with a hill-shaped porous windscreen on the ground, where a wind becomes slow. The flow around the windscreen is numerically simulated. The result shows that a part of the flow penetrates the windscreen and decelerates by the energy loss, and that the other part of the flow moves around the windscreen and separates near behind the top. The effect of the windscreen is experimentally examined with an open wind tunnel. The wind noise in the low-frequency regime reduces with an increase of the windscreen height, and this indicates that the flow separation near the top of the windscreen has dominant effect on the low-frequency wind noise.
