CUED Publications database

Prediction of combustion noise for an aeroengine combustor

Liu, Y and Dowling, AP and Swaminathan, N and Morvant, R and Macquisten, MA and Caracciolo, LF (2014) Prediction of combustion noise for an aeroengine combustor. Journal of Propulsion and Power, 30. pp. 114-122. ISSN 0748-4658

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Abstract

Combustion noise may become an important noise source for lean-burn gas turbine engines, and this noise is usually associated with highly unsteady flames. This work aims to compute the broadband combustion noise spectrum for a realistic aeroengine combustor and to compare with available measured noise data on a demonstrator aeroengine. A low-order linear network model is applied to a demonstrator engine combustor to obtain the transfer function that relates to unsteadiness in the rate of heat release, acoustic, entropic, and vortical fluctuations. A spectral model is used for the heat release rate fluctuation, which is the source of the noise. The mean flow of the aeroengine combustor required as input data to this spectral model is obtained from Reynolds-averaged Navier-Stokes simulations. The computed acoustic field for a low-to-medium power setting indicates that the models used in this study capture the main characteristics of the broadband spectral shape of combustion noise. Reasonable agreement with the measured spectral level is achieved. © 2012 AIAA.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div A > Fluid Mechanics
Div A > Energy
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:27
Last Modified: 26 Nov 2014 19:06
DOI: 10.2514/1.B34857