| 摘要 |
Apparatus for damping thermoacoustic vibrations in a combustion chamber (7), in particular in the combustion chamber of a gas turbine, comprises a Helmholtz resonator (1) having a resonator space (2) and a connecting tube (3) by means of which the resonator space (2) is connected to the combustion chamber (7), a uniform damping performance is achieved even under fluctuating operating conditions when the Helmholtz resonator (1) is equipped with means for controlling the resonator frequency as a function of the frequency of the combustion-chamber vibrations. This may involve controlling the density of the gases in the connecting tube by heating them. Alternatively, a gas feed line leads into the resonator space so that gases of different density can be directed into the resonator space. A control circuit may control the density of the gases in the connecting tube in accordance with the phase difference between the combustion chamber vibrations and the resonator vibrations. <IMAGE> |
