Notice of RetractionFrequency hopping of thermo-acoustic instability in Rijke-type combustors using joint-time-frequency analysis

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.

The presenting author of this paper has the option to appeal this decision by contacting TPII@ieee.org.

In order to study the mechanism of flame extinguishment caused by thermo-acoustic instability inside the Rijke-type combustors, two Rijke-type combustors have been explored, and experimental data on acoustic waves, pressure amplitude, resonant frequency as well as temperature were measured and analyzed. Joint time frequency analysis (JTFA) method was employed to analyze the characteristics of the resonant frequency when the flame is about to be extinguished. Results revealed that the eigen-frequency of start-oscillation process is several times larger than that just before the flame extinguishment, and that the resonant frequency jump to a lower value (a lower eigen-frequency mode) when flame extinguishment in Rijke-type combustors happened. On the other hand, a bulk mode of thermo-acoustic oscillations with resonant frequency less than 10 Hz occurs when the flame is about to be extinguished.