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http://dx.doi.org/10.6108/KSPE.2015.19.4.015

Effects of Acoustic Boundary Conditions on Combustion Instabilities in a Gas Turbine Combustor  

Lim, Jaeyoung (School of Mechanical and Automotive Engineering, Gangneung-Wonju National University)
Kim, Deasik (School of Mechanical and Automotive Engineering, Gangneung-Wonju National University)
Kim, Seong-Ku (Space Propulsion Division, Korea Aerospace Research Institute)
Cha, Dong Jin (Department of Building and Plant Engineering, Hanbat National University)
Publication Information
Journal of the Korean Society of Propulsion Engineers / v.19, no.4, 2015 , pp. 15-23 More about this Journal
Abstract
This study predicts the basic characteristics of combustion instabilities in a gas turbine lean premixed combustor using ASCI3D code which is a FEM(Finite Element Method)-based Helmholtz solver. The prediction results show the good agreement with the measured data in modeling the overall combustion instability features, however, the code is found to overpredict the unstable conditions. As one of the efforts to improve the model accuracy, the effects of acoustic boundary conditions on the instability growth rate are analyzed. As a result, it is shown that the acoustic reflection coefficient has a great impact on the instability and the prediction accuracy can be enhanced by defining the precise acoustic conditions.
Keywords
Combustion Instability; Reflection Coefficient; Helmholtz Solver; Growth Rate;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
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