dc.contributor |
Morgans, Aimee |
dc.contributor.author |
Dilmé Punset, Jordi |
dc.date |
2010 |
dc.identifier.uri |
http://hdl.handle.net/2099.1/14582 |
dc.language.iso |
eng |
dc.publisher |
Universitat Politècnica de Catalunya |
dc.publisher |
Imperial College London |
dc.rights |
info:eu-repo/semantics/openAccess |
dc.subject |
Àrees temàtiques de la UPC::Física::Termodinàmica |
dc.subject |
Combustion -- Computer simulation |
dc.subject |
SIMULINK (Computer program) |
dc.subject |
Combustió -- Simulació per ordinador |
dc.subject |
SIMULINK (Programes d'ordinador) |
dc.title |
Modelling thermoacoustic instabilities with a graphical interface (Simulink) |
dc.type |
info:eu-repo/semantics/bachelorThesis |
dc.description.abstract |
Combustion units frequently experience thermoacoustic instabilities, also known as
combustion oscillations, which are consequence of the internal coupling between acoustic
waves and unsteady heat release. Deterioration in system performance, starting by
increased emissions or higher levels of fuel consumption, may occur due to this largeamplitude
flow oscillations and their associated pressure fluctuations and, under some
circumstances, these can be intense enough to cause structural damage on the installation.
After introducing its physical background, this acoustic phenomenon is modelled in
the time domain using a one‐dimensional linearized analytical approach and then
implemented into Simulink; thus providing a pioneering tool which models combustion
instabilities in an interactive and customizable environment. A first model reproduces the
behaviour of an acoustically excited pipe without combustion, whereas a second one
simulates the performance of a generic combustor with unsteady heat release without
mean flow. The validity of the conceived models is checked through comparison with
acoustics theory and earlier research developed in the Laplace domain. This graphical
modelling aspires to become a faster, more visual alternative to the complex current
approaches to the analysis of combustion oscillations, especially suitable for shorter
projects thanks to its simplicity of use.
As an initial approach to the interruption of combustion oscillations, feedback
control is applied to the modelled combustor. A fixed‐parameter controller is designed in
the time domain using Nyquist and Bode techniques and then implanted into the Simulink
model. Finally, the robustness of the controller to slight changes in the heat release time
delay is assessed. |
dc.description.abstract |
Outgoing |