Abstract
This paper describes recent work on the prediction of airflow generated noise in ducts based upon pressure loss characteristics. Strategies employed to reduce turbulence by smoothing the flow around a bend include the use of turning vanes, and a large radius of curvature with the associated use of splitters. The effect of these strategies on the regenerated noise is examined for a range of common bends including mitred bends, with and without turning vanes, and radiussed bends, with and without splitters. The effect of bends with different aspect ratios is also examined. An excellent collapse of measured data onto a single characteristic curve is reported for each configuration based upon standard values of pressure loss coefficients. It is suggested that that these characteristic curves might form the basis for a practical prediction method.
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