Method and apparatus for controlling thermoacoustic vibrations in a combustion system
AssigneeAlstom
InventorsEphraim Gutmark, Christian Oliver Paschereit, Wolfgang Weisenstein
Life of this patent
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Abstract
In a method of controlling thermoacoustic vibrations in a combustion system having a combustion chamber and a burner, the fluid shear layer forming in the region of the burner is acoustically excited. An apparatus for controlling thermoacoustic vibrations in a combustion system having a combustion chamber and a burner is distinguished by the fact that device(s) for the acoustic excitation of the working gas are arranged in the region of the burner.
Claims13
A method of suppressing thermoacoustic vibrations in a combustion system having a combustion chamber, a plenum arranged upstream of the combustion chamber, a burner arranged between the combustion chamber and the plenum, and a working gas flowing through the combustion system, wherein a shear layer forms in the working gas as the working gas flows through the combustion system, comprising the steps of:
- acoustically exciting the shear layer with the acoustic excitation of the shear layer being instantaneous;
- and
- phase coupling the acoustic excitation with a signal measured in the combustion system;
- wherein the step of acoustically exciting the shear layer comprises introducing the acoustic excitation into the combustion system at the plenum.
An apparatus for suppressing fluid pressure oscillations in a combustion system having a plenum, a combustion chamber and a burner, the burner being located upstream of the combustion chamber and between the combustion chamber and the plenum, the apparatus comprising:
- a first mechanism for acoustically exciting shear layers of a working gas in the combustion system, the mechanism being arranged in acoustic communication with the plenum;
- at least one first sensor arranged to measure pressure fluctuations within the plenum;
- and
- a first controller for controlling the first mechanism as a function of a signal output from the at least one first sensor, to suppress acoustic vibrations in the combustion system.
Dependencies are inferred from the claim text.