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- W777635208 abstract "A prediction method for sound attenuation in acoustically linedcircular ducts of uniform cross section containing radially shearedfluid flow is developed. The flow is regarded as consisting of a coreof uniform flow surrounded by a thin layer near the duct wall in whichthe flow is sheared. The method is based on the solutions (acousticmodes) of an eigenfunction derived from the governing wave equationand the boundary conditions. Sound attenuation is computed by assumingequal distribution of the acoustic energy among the propagating acousticmodes at the reference plane. Amplitudes of modes reflected from theduct termination are considered negligible.To test the method, predictions are compared with measured datafrom circular section flow duct absorber test facilities and from linertests in the intake duct of the RB 211 turbofan engine. The agreementbetween the measured and the predicted attenuation spectra is very goodwhen sound propagation is upstream. In the downstream propagation case,equal modal energies lead to slight over prediction of sound attenuationat higher frequencies. An empirical solution to this problem is found byrestricting the computation to the modes of the first four circumferentialorders.A numerical technique is developed which uses only a fraction of themodal solutions to compute attenuations without loss of accuracy, thus considerably saving computing time and costs.A detailed study is carried out to highlight the effects on modal andtotal attenuations of changes in the values of the principal parametersand a number of design guidelines are deduced. Procedures for theprediction of sound attenuation in engine ducts are discussed and anapproach to design the most effective liners is suggested.A comprehensive set of computer programs is developed to assist theNoise Engineer in the predictions and design optimisations of acousticliners in project engines." @default.
- W777635208 created "2016-06-24" @default.
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- W777635208 date "1980-01-01" @default.
- W777635208 modified "2023-09-23" @default.
- W777635208 title "On the prediction of sound attenuation in acoustically lined circular ducts" @default.
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