Numerical investigation of azimuthal thermoacoustic instability in a gas turbine model combustor
نویسندگان
چکیده
Self-excited spinning mode azimuthal instability in an annular combustor with non-swirling flow is investigated using large eddy simulation (LES). Compressible Navier-Stoke equations are solved a flamelet combustion model to describe the subgrid chemistry$-$turbulence interactions. Two models, and without heat loss effects, compared elucidate non-adiabatic wall effects on thermoacoustic instability. The modes captured well by both models only marginal differences computed frequencies amplitudes. By comparing experimental measurements, given LES approximately 10\% higher amplitudes predicted. Further analysis of data shows similar dominant anti-clockwise mode, under which good agreement observed for phase-averaged release rate fluctuations. Dynamic decomposition (DMD) applied shed more light this mode. DMD reconstructed their agree very structure acoustic pressure from considerable non-zero profile at outlet, could be essential establish combustor. Finally, low-order modelling study was conducted network combined flame transfer function extracted LES. results show that associated plenum showing first longitudinal mixed structure. tuning length match effective volume, predicted frequency becomes close measured value.
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ژورنال
عنوان ژورنال: Fuel
سال: 2023
ISSN: ['0016-2361', '1873-7153']
DOI: https://doi.org/10.1016/j.fuel.2023.127405