General Electric Company

Raghavan P Pandalai

Bruce Alan Carter

Horst W Hehmann

An apparatus for suppressing or attenuating acoustic pressure oscillations in a gas turbine engine combustor, the apparatus having a quarter wave resonator with a cavity closed at a first end and open at a second end and a characteristic length that reflects waves 180 degrees out of phase with the incoming waves and a viscous damper at the open end of the cavity. At least one resonating tube with a closed end and an open end and a single cavity therebetween, a damping plate with a plurality of apertures therethrough disposed across the open end, and a means for mounting the tube on the engine so that the damping plate is essentially flush with the wall. The apertures preferably have a total open area that is about 8% of an inclusive area of the open end and the tube may be cylindrical and the apertures circular. The tube preferably has a centerline through the cavity with a characteristic length extending from the closed end to the damping plate wherein the characteristic length is essentially equal to a quarter of a wavelength of an acoustic pressure oscillation produced in the combustor having a predetermined acoustic frequency.

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Cincinnati, OH, United States of America

Raghavan P Pandalai