| Prediction of thermoacoustic instability in Rijke tube using CFD-CAA numerical method
Woo-Seog Song, Seungbae Lee*, Dong-Shin Shin
The Journal of Mechanical Science and Technology, vol. 25, no. 3, pp.675-682, 2011
Abstract : The coupling between the emitted energy and the acoustic energy in a thermal system, e.g. combustor, may result in system instability
accompanying severe vibration. In this study, the limit curve for thermo-acoustic instability is numerically obtained by using the CFDCAA
combined method. The response function for pulsating release of heat in the Rijke tube and the distribution of mean density in the
tube are computed accurately by the CFD analysis and used as inputs to CAA predictions. To verify the accuracy of the prediction
method, the thermo-acoustics inside the horizontal, one meter long Rijke tube of square cross-section, which has the heating part at the
location of one quarter length, is simulated. The predicted instability curve agrees well with the experimental one except the low flowrate
region of ReDo < 1.
Keyword : Thermoaoustic instability; Rijke tube; Computational Aero-Acoustics (CAA) |
