Production of oscillatory flow in wind tunnels |
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Authors: | K Al-Asmi I P Castro |
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Institution: | (1) Dept. of Mechanical Engineering, University of Surrey, GU2 5XH Guildford, Surrey, UK;(2) Present address: College of Engineering, Sultan Qaboos University, PO Box 32483, Al-Khad, Sultanate Of Oman |
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Abstract: | A method for producing oscillatory flow in open-circuit wind tunnels driven by centrifugal fans is described. Performance characteristics of a new device installed on two such tunnels of greatly differing size are presented. It is shown that sinusoidal variations of the working section flow, having peak-to-peak amplitudes up to at least 30% of the mean flow speed and frequencies up to, typically, that corresponding to the acoustic quarter-wave-length frequency determined by the tunnel size, can be obtained with negligible harmonic distortion or acoustic noise difficulties. A brief review of the various methods that have been used previously is included and the advantages and disadvantages of these different techniques are highlighted. The present technique seems to represent a significant improvement over many of them. |
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