Acoustic wave propagation in a duct with varying temperatures
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Date
2017
Authors
Massey-Hicks, Craig
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Abstract
This project examines the propagation of an acoustic wave through a composite duct. The
geometry of the duct is selected to approximate that of a gas turbine combustor and a
temperature field is applied to this geometry. The temperature field was obtained from a
CFD model of a working gas turbine combustor and the acoustic modelling was performed in
the ANSYS Mechanical Acoustic ACT extension, using Finite Element methods. The CFD
models were validated by comparing their results with data from the manual for the engine
used as the basis for these models. The acoustic models were verified and validated by
comparing them with the results of a 1 dimensional, theoretical model implemented in
various Matlab scripts. The final model presents the Sound Pressure level in the composite
duct with an applied temperature field at a frequency of 600Hz and with an excitation of
1m.The use of the Finite Element approach and the assumptions central to the theoretical model
were found to be reasonable for the conditions encountered in the combustor. The Finite
Element models showed good agreement with the theoretical models and the next steps in
the development of these models were presented.
Description
A research report submitted to the Faculty of Engineering and the Built Environment,
University of the Witwatersrand, Johannesburg, in partial fulfillment of the
requirements for the degree of Master of Science in Engineering.
Johannesburg, September 2017
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Citation
Massey Hicks, Craig (2017) Acoustic wave propagation in a duct with varying temperatures,University of the Witwatersrand, Johannesburg, <http://hdl.handle.net/10539/25937>