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http://dx.doi.org/10.7316/KHNES.2018.29.5.538

Combustion Instability of Gas Turbine with Segmented Dynamic Thermo-Acoustic Model under Load Follow-Up  

JEONG, JIWOONG (Department of Mechanical Engineering, Chungnam National University)
HAN, JAEYOUNG (Institute of Advanced Transportation Vehicles (IATV), Chungnam National University)
JEONG, JINHEE (Institute of Advanced Transportation Vehicles (IATV), Chungnam National University)
YU, SANGSEOK (Department of Mechanical Engineering, Chungnam National University)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.29, no.5, 2018 , pp. 538-548 More about this Journal
Abstract
The thermo-acoustic instability in the combustion process of a gas turbine is caused by the interaction of the heat release mechanism and the pressure perturbation. These acoustic vibrations cause fatigue failure of the combustor and decrease the combustion efficiency. This study is to develop a segmented dynamic thermo-acoustic model to understand combustion instability of gas turbine. Therefore, this study required a dynamic analysis rather than static analysis, and developed a segmented model that can analyze the performance of the system over time using the Matlab/Simulink. The developed model can confirm the thermo-acoustic combustion instability and exhaust gas concentration in the combustion chamber according to the equivalent ratio change, and confirm the thermo-acoustic combustion instability for the inlet temperature and the load changes. As a result, segmented dynamic thermo-acoustic model has been developed to analyze combustion instability under the operating condition.
Keywords
Gas turbine; Combustion; Thermo-acoustic instability; Wave equation; Finite difference method;
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