Acoustic damper for gas turbine combustors with orthogonal slots

An acoustic damper system for a gas turbine combustor, the system comprising:

• a first low porosity layer section formed in a liner of the gas turbine combustor, the first low porosity layer section having a first arrangement of elongated generally S-shaped slots formed therein;
• a first housing having a first plurality of feed apertures, the first housing being coupled to the first low porosity layer section thereby defining a first cavity, air outside the first housing being configured to flow through at least a portion of the first plurality of feed apertures in the first housing and through at least a portion of the first arrangement of elongated generally S-shaped slots in the first low porosity layer, thereby transforming a first range of frequencies of acoustic energy into thermal energy and aiding in providing an acoustic dampening effect on the first range of frequencies of acoustic energy for the gas turbine combustor during operation thereof;
• a second low porosity layer section formed in the liner of the gas turbine combustor, the second low porosity layer section having a second arrangement of elongated generally S-shaped slots formed therein;
• and
• a second housing having a second plurality of feed apertures, the second housing being coupled to the second low porosity layer section thereby defining a second cavity, air outside the second housing being configured to flow through at least a portion of the second plurality of feed apertures in the second housing and through at least a portion of the second arrangement of elongated generally S-shaped slots in the second low porosity layer, thereby transforming a second range of frequencies of acoustic energy into thermal energy and aiding in providing an acoustic dampening effect on the second range of frequencies of acoustic energy for the gas turbine combustor during operation thereof;
• a first metering layer having a first arrangement of apertures therein, the first metering layer being positioned within the first housing such that the first metering layer divides the cavity into a first sub-cavity and a second sub-cavity, and wherein the first metering layer is generally parallel with and spaced a distance from the first low porosity layer section, the distance being between five millimeters and one hundred millimeters;
• and
• a second metering layer having a second arrangement of apertures, the second metering layer being positioned within the first housing such that the first metering layer and the second metering layer divide the cavity into three sub-cavities, and wherein a porosity of the first arrangement of apertures is different from a porosity of the second arrangement of apertures.