Vibration-damping device for a combustion chamber

摘要

Part of the air stream (46) coming from the compressor is guided through cooling ducts (22,24). These ducts are designed so that the acoustic impedance at the inlet (23,25) of the ducts into the burner chamber hood (14) is minimised at certain frequencies which are to be damped. The cooling ducts can be formed as resonators which become resonant at one or more of the frequencies being damped. The resonators can be tuned to the basic frequency to be damped of the vibration modes of the ring burner chamber. The length of the ducts is just half the wave length of the basic frequency to be damped.