Abstract
The effects of edge geometry on flow-induced acoustic resonances in closed side branches are investigated experimentally. The bilateral round edges of R = 5, 10 mm and chamfered edges of angle = 45° and C = 10 mm, where R and C are the widths of the round and chamfered edges respectively, are investigated. The round and chamfered edges both delay the onset of the acoustic resonance to a higher velocity. However, the round edges enhance the resonance normalized pressure, while the chamfered edges do not. The effects of unilateral round edges, R = 10 mm, are also investigated. The unilateral upstream round edge almost totally dominates the delay and enhancement effects, while the unilateral downstream round edge has little delay effect and suppresses the acoustic resonance partially. Finally, a method to predict the preliminary velocity range of acoustic resonance for closed side branches with round edges is proposed based on the experimental results.
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