Applications of finite element and wave envelope element approximations to turbofan engine noise radiation including flight effectsThe problem of acoustic radiation from turbofan engine inlets in flow has not lent itself fully to analysis by numerical means because of the large domains and high frequencies involved. The current work has extended the use of finite elements and wave envelope elements, elements which simulate decay and wavelike behaviour in their interpolation functions, from the no-flow case in which they have been proven, to cases incorporating mean flow. By employing an irrotational mean flow assumption, the acoustics problem has been posed in an axisymmetric formulation in terms of acoustic velocity potential, thus minimizing computer solution storage requirements. The results obtained from the numerical procedures agree well with known analytical solutions, static experimental jet engines inflow data, and also with flight test results.
Document ID
19850028726
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Parrett, A. V. (GM Noise and Vibration Laboratory Milford, MI, United States)
Eversman, W. (Missouri-Rolla, University Rolla, MO, United States)