Gas turbine and the combustor thereof
The objective is to provide a gas turbine and the combustor thereof in which super high frequency combustion oscillation and the generation of NOx are reduced. The fluctuation in pressure which induces the fluctuation in heat liberation is suppressed in the gas turbine combustor comprising a plurality of main fuel supply nozzles, each having a premixing nozzle at the top end part thereof, by providing in the space upstream from the premixing nozzles partition elements for dividing the space along the axis of the combustor or a honeycomb element having air passages in the axial direction, or by providing premixing nozzles composed of cylindrical elements with many holes.
1. A combustor for a gas turbine provided with
a plurality of main fuel supply nozzles provided around a pilot burner located on the center axis of a flame tube, each main fuel supply nozzles having a premixing nozzle at an end part thereof, and
a sound pressure suppressing device for suppressing the propagation of sound pressure in the direction along a section transversal to a longitudinal axis of the combustor in the circumferential direction around the axis thereof while allowing the free flow of air passing therethrough provided in one of a space where said premixing nozzles are located and a space upstream therefrom.
2. A combustor for a gas turbine according to claim 1 , wherein said sound pressure suppressing device comprises one of a single partition member and a plurality of partition members with a plurality holes, which partition a space around at least one premixing nozzle and a space upstream therefrom along the axial direction of the combustor.
3. A combustor for a gas turbine according to claim 1 , wherein said sound pressure suppressing device comprises premixing nozzles, each of which comprises a porous cylindrical element.
4. A combustor for a gas turbine according to claim 2 , wherein said sound pressure suppressing device comprises a combination of the premixing nozzles composed of porous cylindrical elements and the partition members with said holes.
5. A combustor for a gas turbine according to claim 1 , wherein said sound pressure suppressing device comprises a combination of said premixing nozzles comprising porous cylindrical elements and a honeycomb-like element.