Apparatus for damping acoustic vibrations in a combustor

A system comprising:

• a turbine having a pressure container, the pressure container having a wall;
• a combustor;
• and
• an apparatus for damping acoustic vibrations in the combustor, the apparatus including:
• a Helmholtz resonator having a resonance volume and a connecting channel through which the combustor can be connected with the resonance volume, and
• a hollow body having a volume and a fluid supply line in fluid communication with the volume, the hollow body being configured and arranged to change the hollow body volume by adding or draining a fluid via the supply line, the hollow body being located in the Helmholtz resonator or adjacent to the Helmholtz resonator, and
• a regulator in fluid communication with the supply line, the regulator regulating the addition or draining of the fluid via the supply line as a function of the frequency of a highest vibration amplitude in the combustor,
• wherein the resonance volume of the Helmholtz resonator is changed when the volume of the hollow body is changed;
• wherein the Helmholtz resonator and the combustor are arranged inside the pressure container, and wherein the supply line to the hollow body passes outwardly through the pressure container wall.

A system comprising:

• a turbine having a pressure container, the pressure container having a wall;
• a combustor, and
• an apparatus for damping acoustic vibrations in the combustor, the apparatus including:
• a Helmholtz resonator having a resonance volume and a connecting channel through which the combustor can be connected with the resonance volume, and
• a hollow body having a volume and a fluid supply line in fluid communication with the volume, the hollow body being configured and arranged to change the hollow body volume by adding or draining air from the turbine via the supply line, the hollow body being located in the Helmholtz resonator or adjacent to the Helmholtz resonator,
• wherein the resonance volume of the Helmholtz resonator is changed when the volume of the hollow body is changed;
• wherein the Helmholtz resonator and the combustor are arranged inside the pressure container, and wherein the supply line to the hollow body passes outwardly through the pressure container wall,
• wherein the hollow body is supplied with air from the turbine.

A method of damping acoustic vibrations in a combustor comprising the steps of:

• providing a Helmholtz resonator in fluid communication with the combustor;
• providing a hollow body, the hollow body being configured and arranged to change the hollow body volume by adding or draining a fluid via a supply line;
• and
• supplying a fluid to the hollow body to change the hollow body volume, the change in the hollow body volume changing the resonance volume of the Helmholtz resonator,
• wherein the combustor has a highest vibration amplitude at a frequency and further comprising the step of:
• regulating the step of supplying the fluid to the hollow body as a function of the frequency of a highest vibration amplitude in the combustor.

A method of damping acoustic vibrations in a combustor comprising the steps of:

• providing a Helmholtz resonator in fluid communication with the combustor;
• providing a hollow body, the hollow body abutting the Helmholtz resonator and being configured and arranged to change the hollow body volume by adding or draining a fluid via a supply line;
• and
• supplying a fluid to the hollow body to change the hollow body volume, the change in the hollow body volume changing the resonance volume of the Helmholtz resonator.