Numerical investigation on combustion instability modeling in a lean premixed gas turbine combustor combining finite element analysis with local flame transfer function

被引:0
|
作者
Yeongmin Pyo
Daesik Kim
Seong-Ku Kim
Dong Jin Cha
机构
[1] Gangneung-Wonju National University,School of Mechanical and Automotive Engineering
[2] Korea Aerospace Research Institute,Combustion Chamber Team
[3] Hanbat National University,Department of Building and Plant Engineering
来源
Journal of Mechanical Science and Technology | 2019年 / 33卷
关键词
Combustion instability; Thermoacoustics; Helmholtz equation; Flame response model; Local flame transfer function;
D O I
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中图分类号
学科分类号
摘要
The present work suggests a numerical approach using an FEM (finite element method) code for the eigenvalue calculation of the thermoacoustic combustion instabilities coupling with the local flame transfer function in a generic lean premixed combustor. The URANS (unsteady Reynolds average Navier-Stokes) simulation shows a good agreement in capturing steady and unsteady flame geometries with the measurement in the literature. Also, global and local parameters of flame responses to acoustic velocity fluctuations undergo quantitatively similar changes in prediction and in the experiment. The numerically determined flame transfer function and gas properties are incorporated in an in-house Helmholtz solver to compute eigenvalues of the target combustor. In the solver, the Helmholtz equation is discretized with a Galerkin FEM on a multi-dimensional hybrid unstructured mesh. The nonlinearity related with the heat release source term is treated with an iterative methodology, and the large scale eigenvalue calculation is performed using the shift-invert approach available in the ARPACK (ARnoldi PACKage) library. The predictive capabilities of the current modeling approach are validated against the measured mode frequency and instability growth rate. In addition, the prediction results show the effect of spatially-distributed heat release on the thermoacoustic model accuracy.
引用
收藏
页码:5547 / 5559
页数:12
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