1995
DOI: 10.1115/1.2873853
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Improved Finite Element Modeling of the Turbofan Engine Inlet Radiation Problem

Abstract: Improvements have been made in the finite element model of the acoustic radiated field from a turbofan engine inlet in the presence of a mean flow. The problem of acoustic radiation from a turbofan engine inlet is difficult to model numerically because of the large domain and high frequencies involved. A numerical model with conventional finite elements in the near field and wave envelope elements in the far field has been constructed. By employing an irrotational mean flow assumption, both the mean flow and t… Show more

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Cited by 28 publications
(3 citation statements)
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“…Nondimensional acoustic pressure and acoustic potential at frequency ! are related by the acoustic momentum equation [18] p r i Mu (1) in which is nondimensional frequency !R c 0 , M U c 0 is nondimensional mean flow velocity based on reference conditions 0 and c 0 at the source plane, and R is the reference duct height at the source plane. Acoustic pressure p is nondimensional with respect to 0 c 2 0 , nondimensional particle velocity u is referenced to c 0 , and nondimensional potential is referenced to Rc 0 .…”
Section: A Termination Boundary Condition At Low Frequencymentioning
confidence: 99%
See 1 more Smart Citation
“…Nondimensional acoustic pressure and acoustic potential at frequency ! are related by the acoustic momentum equation [18] p r i Mu (1) in which is nondimensional frequency !R c 0 , M U c 0 is nondimensional mean flow velocity based on reference conditions 0 and c 0 at the source plane, and R is the reference duct height at the source plane. Acoustic pressure p is nondimensional with respect to 0 c 2 0 , nondimensional particle velocity u is referenced to c 0 , and nondimensional potential is referenced to Rc 0 .…”
Section: A Termination Boundary Condition At Low Frequencymentioning
confidence: 99%
“…This would be the case in a duct with a varying height or curvature (not the case in the current investigation), in an acoustically treated section, and in unlined sections due to scattering near transitions from hard walls to lined walls. To allow for possible nonuniform duct models (area variation or curved), the acoustic field equations are written in a potential formulation [18]. The termination plane is represented by a natural boundary condition describing the contribution of termination impedance.…”
mentioning
confidence: 99%
“…The multiple-scales approach has a number of distinct advantages over full numerical methods as it is ideally suited to handle higher frequencies and the computational complexity is only marginally more than calculating the eigenmodes inside a straight parallel duct. The accuracy and usefulness of the multiple scales approach has been validated against finite-element methods [6] for realistic aeroengine configurations and acoustic frequencies [7,8].…”
Section: Introductionmentioning
confidence: 99%