Thermo-acoustic instabilities in the PRECCINSTA combustor investigated using a compressible LES-pdf approach
File(s)
Published version
Author(s)
Fredrich, Daniel
Jones, WP
Marquis, Andrew
Type
Conference Paper
Abstract
This work predicts the evolution of self-excited thermo-acoustic instabilities in a gas turbine model combustor using large eddy simulation. The developed flow solver is fully compressible and comprises a transported sub-grid probability density function approach in conjunction with the Eulerian stochastic fields method. An unstable operating condition in the PREC-CINSTA test case involving flame oscillation driven by thermo-acoustic instabilities is the chosen target configuration. Good results are obtained in a comparison of time-averaged flow statistics against experimental data. The flame’s self-excited oscillatory behaviour is successfully captured without any external forcing involved. Power spectral density analysis of the oscillation reveals a dominant thermo-acoustic mode at a frequency of 300 Hz providing remarkable agreement with experimental observations. Moreover, the predicted limit-cycle amplitude closely matches the experimental value obtained with rigid metal combustion chamber side walls. Finally, a phase-resolved study of the oscillation cycle is carried out leading to a detailed description of the physical mechanism closing the feedback loop.
Date Issued
2019-06-20
Date Acceptance
2019-02-27
Citation
Proceedings of the 11th Mediterranean Combustion Symposium, 2019, pp.1-12
Publisher
The Combustion Institute
Start Page
1
End Page
12
Journal / Book Title
Proceedings of the 11th Mediterranean Combustion Symposium
Copyright Statement
© 2019 The Author(s)
Sponsor
Siemens Industrial Turbomachinery Ltd
Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (E
Grant Number
See further info
EP/K026801/1
BH172740 (EP/R029369/1)
Source
11th Mediterranean Combustion Symposium
Publication Status
Published
Start Date
2019-06-16
Finish Date
2019-06-20
Coverage Spatial
Tenerife, Spain
Date Publish Online
2019-06-20