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A 3 microphone method to separate direct and in-direct combustion noise inside a turbofan jet engine annular combustor

A 3 microphone method to separate direct and in-direct combustion noise inside a turbofan jet engine annular combustor
A 3 microphone method to separate direct and in-direct combustion noise inside a turbofan jet engine annular combustor
Greater fuel efficiency is a key area in the development of a new generation of turbofan engines. It is currently unclear as to how modifications to the combustor to achieve higher levels of efficiency will affect the combustion noise that reaches the far field. To understand this, it is necessary to be able to identify the contribution of both the direct and the indirect combustion
noise to the far field level. The contribution of these two combustion noise sources is unknown for the current generation of turbofan engines. This paper presents a 3 microphone method for the separation of the direct and indirect combustion noise signals inside the combustor of a turbofan jet engine. The effects of transfer function error and coherence of unwanted noise on the
performance of the technique are examined. This technique is then used as an input to the current combustion noise measurement method, called ‘3S Array’, to examine the effect of transfer function error on the coherence with the far-field. It has been found that the separation is only weakly dependent on transfer function error and is therefore a reasonable technique to apply to real
engine data. All of the data presented in this paper uses models of the problem rather than measurements.
Hart, Anthony
4de3c35b-db19-479c-908b-f2b2596510b7
Holland, Keith R.
54f31132-a3b2-4c89-8989-251d8ccda45c
Joseph, Phillip
9c30491e-8464-4c9a-8723-2abc62bdf75d
Hart, Anthony
4de3c35b-db19-479c-908b-f2b2596510b7
Holland, Keith R.
54f31132-a3b2-4c89-8989-251d8ccda45c
Joseph, Phillip
9c30491e-8464-4c9a-8723-2abc62bdf75d

Hart, Anthony, Holland, Keith R. and Joseph, Phillip (2017) A 3 microphone method to separate direct and in-direct combustion noise inside a turbofan jet engine annular combustor. 24th International Congress on Sound and Vibration, Park Plaza Westminster Bridge Hotel, London, United Kingdom. 23 - 27 Jul 2017. 8 pp . (In Press)

Record type: Conference or Workshop Item (Paper)

Abstract

Greater fuel efficiency is a key area in the development of a new generation of turbofan engines. It is currently unclear as to how modifications to the combustor to achieve higher levels of efficiency will affect the combustion noise that reaches the far field. To understand this, it is necessary to be able to identify the contribution of both the direct and the indirect combustion
noise to the far field level. The contribution of these two combustion noise sources is unknown for the current generation of turbofan engines. This paper presents a 3 microphone method for the separation of the direct and indirect combustion noise signals inside the combustor of a turbofan jet engine. The effects of transfer function error and coherence of unwanted noise on the
performance of the technique are examined. This technique is then used as an input to the current combustion noise measurement method, called ‘3S Array’, to examine the effect of transfer function error on the coherence with the far-field. It has been found that the separation is only weakly dependent on transfer function error and is therefore a reasonable technique to apply to real
engine data. All of the data presented in this paper uses models of the problem rather than measurements.

Text
Anthony Hart ICSV paper 2017 - Accepted Manuscript
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More information

Accepted/In Press date: 22 March 2017
Venue - Dates: 24th International Congress on Sound and Vibration, Park Plaza Westminster Bridge Hotel, London, United Kingdom, 2017-07-23 - 2017-07-27
Organisations: Acoustics Group, Education Hub

Identifiers

Local EPrints ID: 407784
URI: http://eprints.soton.ac.uk/id/eprint/407784
PURE UUID: 7ccd22dd-5fb8-4b95-86d8-7d64d78f53d3

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Date deposited: 26 Apr 2017 01:06
Last modified: 16 Mar 2024 05:15

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Contributors

Author: Anthony Hart
Author: Keith R. Holland
Author: Phillip Joseph

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