Wave Envelope and Finite Element Approximations for Turbofan Noise Radiation in Flight
The 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 that simulate decay and wavelike behavior in their interpolation functions, from the no-flow case in which they have 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 engine inflow data, and flight test results.
A. V. Parrett and W. Eversman, "Wave Envelope and Finite Element Approximations for Turbofan Noise Radiation in Flight," AIAA Journal, American Institute of Aeronautics and Astronautics (AIAA), Jan 1986.
The definitive version is available at http://dx.doi.org/10.2514/3.9342
Mechanical and Aerospace Engineering
Article - Journal
© 1986 American Institute of Aeronautics and Astronautics (AIAA), All rights reserved.