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Effect of steady flow distortion on modes propagating in a turbofan intake duct

Norde, E. (2012) Effect of steady flow distortion on modes propagating in a turbofan intake duct.

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Abstract:This report contains research into the effect of steady ow distortion on modes propagating in a turbofan intake duct. The motivation for this work is the requirement to predict the effect of flow distortion in modern bypass turbofan aeroengines such that it can be used in noise reduction treatments. A set of analytical and numerical methods for predicting the effect of ow distortion have been developed. Analytical solutions for a rectangular and annular duct have been derived to find the modal amplitudes in ducts with uniform and nonuniform flow. These solutions are obtained by using a variational formulation of Pridmore-Brown's equation. A direct eigenvalue solver in MATLAB is developed to support the analytical solution and it is demonstrated that flow distortion has a significant effect on propagating modes. The numerical results are compared to Rolls-Royce data that is obtained from measurements on three different configurations of intake ducts. It is found that there exist similarities between this data and the analytical/numerical model.
Item Type:Internship Report (Master)
Faculty:ET: Engineering Technology
Subject:52 mechanical engineering
Programme:Mechanical Engineering MSc (60439)
Link to this item:http://purl.utwente.nl/essays/63929
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