A duct and method for damping pressure waves caused by thermoacoustic instability

摘要

A duct (10) and a method for damping pressure waves caused by thermoacoustic instability, the duct (10) comprising: a locking Helmholtz resonator (HHR1) positioned on the circumference of the duct (10), the locking Helmholtz resonator (HHR1) tuned to a first frequency; and one or more damping Helmholtz resonators (HHR2) positioned on the circumference of the duct (10) at or adjacent to 90 and/or 270 degrees from the locking Helmholtz resonator (HHR1), wherein the damping Helmholtz resonators (HHR2) are tuned to a second frequency which is different from the first frequency of the locking Helmholtz resonator (HHR1).