Noise generation in ventilation systems by the interaction of airflow with bends and branch take-offs

Recent work on the prediction of airflow generated noise in ducts based upon pressure loss characteristics is applied to a range of in duct components including bends and branch take-offs. An excellent collapse of measured data onto a single characteristic curve is reported for each component based upon standard values of pressure loss coefficients. It is shown that these characteristic curves can be used as the basis for a practical prediction method.