THERMOACOUSTIC OSCILLATION DAMPING IN GAS TURBINE COMBUSTORS WITH ANNULAR PLENUM

摘要

System for preventing the onset, or mitigating the effect of thermoacousticinstability in annular combustors of premixed combustion gas turbines, thatinvolves the inclusion in the plenum (7) of walls (15) oriented in a meridiandirection so as to obstruct the circulation of tangential flows inside saidspace. These walls are situated in suitable azimuthal positions so as tocontrast the onset of any standing oscillation modes; they shall thereforepreferably divide the space in the plenum asymmetrically and the resultingannular volumes shall thus extend preferably along azimuthal sectors whoseangular widths are not multiples of one another.