| CPC F23R 3/14 (2013.01) [F23R 3/28 (2013.01)] | 10 Claims |
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10. A gas turbine comprising:
a compressor configured to compress air introduced from outside;
a combustor configured to mix compressed air supplied from the compressor with fuel and to combust a mixture of the compressed air and the fuel; and
a turbine configured to generate power for generating electric power by passing combustion gas supplied from the combustor to an inner portion of the turbine,
wherein the combustor comprises:
a nozzle casing;
a liner connected to an end portion of the nozzle casing, the liner having an inner portion provided with a combustion chamber in which the mixture of the compressed air and the fuel is combusted;
a transition piece connected to an end portion of the liner, the transition piece being configured to supply the combustion gas generated from the combustion chamber to the turbine; and
a nozzle assembly mounted inside the nozzle casing and configured to eject the fuel and the compressed air into the combustion chamber,
wherein the nozzle assembly comprises:
a nozzle flange configured to receive fuel from the outside;
a nozzle shroud disposed on a first side of the nozzle flange;
a first main cylinder disposed inside the nozzle shroud in a radial direction of the nozzle shroud, the first main cylinder forming a first main flow path and flowing a first air-fuel mixture between the nozzle shroud and the first main cylinder;
a first swirler mounted on the first main cylinder;
a second main cylinder configured to receive and flow cooling air therethrough and disposed inside the first main cylinder in a radial direction of the first main cylinder, the second main cylinder forming a second main flow path and flowing a second air-fuel mixture between the first main cylinder and the second main cylinder; and
a second swirler mounted on the second main cylinder, and
wherein a plurality of fuel supply flow paths is formed in the nozzle flange, and a supplied fuel is distributed to the first swirler and the second swirler along the plurality of fuel supply flow paths,
wherein the first main cylinder is disposed such that a first side end portion of the first main cylinder is shorter than a first side end portion of the second main cylinder,
wherein a bluff body is provided at a first side end portion of the second main cylinder, and a plurality of bluff body cooling holes is formed in the bluff body,
wherein a collision plate provided with a plurality of collision plate cooling holes is disposed inside the second main cylinder upstream and adjacent to the bluff body,
wherein the second main cylinder comprises an interior diameter decreasing portion where the second main cylinder's diameter gradually decreases toward downstream before the collision plate such that the second main cylinder comprises a first portion before the interior diameter deceasing portion, a second portion from the interior diameter decreasing portion to the collision plate, and a third portion from the collision plate to the bluff body, the first portion having a constant first interior diameter, the second portion having a constant second interior diameter, the third portion having a constant third interior diameter, the first interior diameter being larger than the second and third interior diameters, the second interior diameter and the third interior diameter being equal.
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