DAMPING DEVICE FOR A GAS TURBINE, GAS TURBINE AND METHOD FOR DAMPING THERMO-ACOUSTIC VIBRATIONS

摘要

The invention relates to a damping device (50) for a gas turbine, said damping device having: • - at least one Helmholtz resonator (23) and • - at least one duct (53), • - wherein the Helmholtz resonator has a resonator housing (27) and at least one resonator neck pipe (28) and the resonator housing (27) encloses a resonance volume (30) of the Helmholtz resonator (23), into which volume acoustic vibrations can be injected by means of the resonator neck pipe (28). The damping device according to the invention enables a particularly effective damping of thermo-acoustic vibrations. For this purpose, the duct (53) is formed with a duct jacket and at least one outlet opening (52). Acoustic vibrations of a fluid stream flowing through a burner plenum and a combustion chamber can be injected into the outlet opening. A cooling fluid can be applied to the duct and the at least one resonator neck pipe opens on the hot-gas side into such a duct upstream of the at least one outlet opening.