LOW-ORDER MODELING OF CAN-ANNULAR COMBUSTORS

被引:0
|
作者
Fournier, Guillaume J. J. [1 ]
Meindl, Max [1 ]
Silva, Camilo F. [1 ]
Ghirardo, Giulio [2 ]
Bothien, Mirko R. [3 ]
Polifke, Wolfgang [1 ]
机构
[1] Tech Univ Munich, Dept Mech Engn, D-85747 Garching, Germany
[2] Ansaldo Energia Switzerland, Haselstr 18, CH-5400 Baden, Switzerland
[3] Zurich Univ Appl Sci, Inst Energy Syst & Fluid Engn, CH-8400 Winterthur, Switzerland
来源
PROCEEDINGS OF ASME TURBO EXPO 2021: TURBOMACHINERY TECHNICAL CONFERENCE AND EXPOSITION, VOL 3A | 2021年
关键词
CROSS-TALK; INSTABILITIES;
D O I
暂无
中图分类号
O414.1 [热力学];
学科分类号
摘要
Heavy-duty land-based gas turbines are often designed with can-annular combustors, which consist of a set of identical cans, acoustically connected on the upstream side via the compressor plenum, and, downstream, with a small annular gap located at the transition with the first turbine stage. The modeling of this cross-talk area is crucial to predict the thermo-acoustic modes of the system. Thanks to the discrete rotational symmetry, Bloch wave theory can be exploited to reduce the system to a longitudinal combustor with a complex-valued equivalent outlet reflection coefficient, which models the annular gap. The present study reviews existing low-order models based purely on geometrical parameters and compares them to 2D Helmholtz simulations. We demonstrate that the modeling of the gap as a thin annulus is not suited for can-annular combustors and that the Rayleigh conductivity model only gives qualitative agreement. We then propose an extension for the equivalent reflection coefficient that accounts not only for geometrical but also flow parameters, by means of a characteristic length. The proposed model is in excellent agreement with 2D simulations and is able to correctly capture the eigenfrequencies of the system. We then perform a Design of Experiments study that allows us to explore various configurations and build correlations for the characteristic length. Finally, we discuss the validity limits of the proposed low-order modeling approach.
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页数:14
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