Proceedings of the KSME Conference (대한기계학회:학술대회논문집)
- 2008.11b
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- Pages.2946-2951
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- 2008
A Combustion Instability Analysis of a Model Gas Turbine Combustor by the Transfer Matrix Method
- Cha, Dong-Jin (Department of Building Services Engineering, Hanbat National University) ;
- Kim, Jay-H. (Department of Mechanical Engineering, The University of Cincinnati) ;
- Joo, Yong-Jin (IGCC Group, Korea Electric Power Research Institute)
- Published : 2008.11.05
Abstract
Combustion instability is a major issue in design of gas turbine combustors for efficient operation with low emissions. Combustion instability is induced by the interaction of the unsteady heat release of the combustion process and the change in the acoustic pressure in the combustion chamber. In an effort to develop a technique to predict self-excited combustion instability of gas turbine combustors, a new stability analysis method based on the transfer matrix method is developed. The method views the combustion system as a one-dimensional acoustic system with a side branch and describes the heat source as the input to the system. This approach makes it possible to use the advantages of not only the transfer matrix method but also well-established classic control theories. The approach is applied to a simple gas turbine combustion system to demonstrate the validity and effectiveness of the approach.
Keywords
- Combustion instability;
- model gas turbine combustor;
- normal mode method;
- stability margin thermoacoustics;
- transfer matrix method