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Prediction of turbulence-cascade interaction noise using modal approach

Prediction of turbulence-cascade interaction noise using modal approach
Prediction of turbulence-cascade interaction noise using modal approach

The turbulent wakes generated by a rotor interacting with outlet guide vanes is one of the dominant broadband noise sources in a turbofan engine. The present paper deals with the prediction of broadband noise due to the interaction of rotor wake turbulence with the OGV. The proposed approach aims to reproduce the two-point cross-spectral statistics of the turbulent velocity fluctuations at the OGV leading edges, which provides a complete specification of the rotor wake turbulence for broadband noise predictions. The approach proposed here is based on a superposition of vortical modes with the appropriate amplitudes. Three different vortical modes are compared for their reconstruction efficiency and accuracy: 1) Fourier modes, 2) Proper Orthogonal Decomposition (POD) modes 3) Normal modes of the Linearized Euler Equations (LEE).

American Institute of Aeronautics and Astronautics
Chaitanya, Paruchuri
5c1def64-6347-4be3-ac2d-b9f6a314b81d
Joseph, Phillip
9c30491e-8464-4c9a-8723-2abc62bdf75d
Mao, Yijun
3012974a-d258-4a40-8461-b4c41b9cf85c
Wilson, Alexander G.
208d47f4-0a9d-4de3-8e45-07536862d07b
Chaitanya, Paruchuri
5c1def64-6347-4be3-ac2d-b9f6a314b81d
Joseph, Phillip
9c30491e-8464-4c9a-8723-2abc62bdf75d
Mao, Yijun
3012974a-d258-4a40-8461-b4c41b9cf85c
Wilson, Alexander G.
208d47f4-0a9d-4de3-8e45-07536862d07b

Chaitanya, Paruchuri, Joseph, Phillip, Mao, Yijun and Wilson, Alexander G. (2018) Prediction of turbulence-cascade interaction noise using modal approach. In 2018 AIAA/CEAS Aeroacoustics Conference. American Institute of Aeronautics and Astronautics.. (doi:10.2514/6.2018-3781).

Record type: Conference or Workshop Item (Paper)

Abstract

The turbulent wakes generated by a rotor interacting with outlet guide vanes is one of the dominant broadband noise sources in a turbofan engine. The present paper deals with the prediction of broadband noise due to the interaction of rotor wake turbulence with the OGV. The proposed approach aims to reproduce the two-point cross-spectral statistics of the turbulent velocity fluctuations at the OGV leading edges, which provides a complete specification of the rotor wake turbulence for broadband noise predictions. The approach proposed here is based on a superposition of vortical modes with the appropriate amplitudes. Three different vortical modes are compared for their reconstruction efficiency and accuracy: 1) Fourier modes, 2) Proper Orthogonal Decomposition (POD) modes 3) Normal modes of the Linearized Euler Equations (LEE).

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More information

e-pub ahead of print date: 24 June 2018
Published date: 25 June 2018
Venue - Dates: AIAA/CEAS Aeroacoustics Conference, 2018, Atlanta, United States, 2018-06-25 - 2018-06-29

Identifiers

Local EPrints ID: 424572
URI: https://eprints.soton.ac.uk/id/eprint/424572
PURE UUID: ed8d9496-5a81-4885-a2bf-64f68856a3c7

Catalogue record

Date deposited: 05 Oct 2018 11:38
Last modified: 17 Jan 2019 17:30

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