The invention relates to a Helmholtz resonator (11), which has a resonating volume in connection with the combustion chamber volume via a connective opening (15). The device has the unique characteristic that an adjustable flow (14,20) of cooling air can be introduced into the resonating volume and connective opening (15). As opposed to other approaches for tuning a Helmholtz resonator (11), the present invention allows for the first time the resonance frequency of the Helmholtz resonator (11) to be adjusted by a dynamic flow (14,25) of cooling air. A method for damping thermoacoustic oscillations in a combustion chamber is also given, wherein a flow (14,25) of cooling air is adjusted in order to modify the resonator characteristics of the Helmholtz resonator (11) fluidically connected to the combustion chamber (20). IMAGE
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