[引用][C] Large eddy simulation of a thermoacoustic instability within a swirl-stabilized burner using impedance boundary conditions
JM Lourier, B Noll, M Aigner - … Expo: Power for …, 2014 - asmedigitalcollection.asme.org
JM Lourier, B Noll, M Aigner
Turbo Expo: Power for Land, Sea, and Air, 2014•asmedigitalcollection.asme.orgA thermoacoustic instability observed within a lean swirl-stabilized burner is analyzed by
means of numerical calculations. As extension to previously reported numerical data for the
considered test case, the numerical domain is extended to include the fuel plenum and the
acoustic outlet impedance is modeled by time domain impedance boundary conditions. The
predicted thermoacoustic frequency is in excellent agreement with experimental findings.
Furthermore, the thermoacoustic feedback loop is discussed by means of phase resolved …
means of numerical calculations. As extension to previously reported numerical data for the
considered test case, the numerical domain is extended to include the fuel plenum and the
acoustic outlet impedance is modeled by time domain impedance boundary conditions. The
predicted thermoacoustic frequency is in excellent agreement with experimental findings.
Furthermore, the thermoacoustic feedback loop is discussed by means of phase resolved …
A thermoacoustic instability observed within a lean swirl-stabilized burner is analyzed by means of numerical calculations. As extension to previously reported numerical data for the considered test case, the numerical domain is extended to include the fuel plenum and the acoustic outlet impedance is modeled by time domain impedance boundary conditions.
The predicted thermoacoustic frequency is in excellent agreement with experimental findings. Furthermore, the thermoacoustic feedback loop is discussed by means of phase resolved data which show that a variation of the equivalence ratio within the swirler is the driving mechanism of the instability. Finally, the Rayleigh criterion is shown to be satisfied within the combustion chamber. Hence, a closed thermoacoustic feedback loop is observed.
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