Patent ID: 11920795
Assignee: DOOSAN ENERBILITY CO., LTD.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 15:
16. A combustor comprising:
a burner including a plurality of nozzles for injecting fuel and air; and
a duct assembly coupled to one side of the burner to burn a mixture of the fuel and the air and transmit combustion gas to a turbine,
wherein each of the plurality of nozzles comprises:
an outer tube;
a first inner tube installed inside the outer tube to form an air passage with the outer tube therebetween;
a second inner tube installed inside the first inner tube to form a main fuel passage with the first inner tube therebetween, the second inner tube having a pilot fuel passage formed therein; and
a fuel injection device installed in the second inner tube to inject the fuel,
wherein the fuel injection device comprises:
a flow guide comprising a rod-shaped body and a plurality of protrusions protruding outwardly from the rod-shaped body;
a plurality of guide channels connected to the pilot fuel passage through which the fuel is supplied, each guide channel being formed between two adjacent protrusions of the plurality of protrusions, outward ends of the two adjacent protrusions being circumferentially spaced apart from each other;
an injection chamber connected to the plurality of guide channels, the fuel being merged in the injection chamber; and
an injection hole formed at a tip of the injection chamber to inject the fuel, and
wherein the injection chamber comprises a decompression space to drop a pressure therein,
wherein each guide channel has an outlet formed at a protrusion tip, each protrusion tip of each protrusion protrudes forward gradually outwards, such that the protrusion tip and the outlet have a curved structure,
wherein the protrusion tip and the outlet connected with a groove of the rod-shaped body to form the decompression space,
wherein the protrusion comprises a tail protrusion protruding further rearward than a rearward end of the rod-shaped body,
wherein the tail protrusion has a shape of a concave groove formed from a rearward end of the rod-shaped body to an outward end of the tail protrusion,
wherein forward and rear directions are viewed in an upstream direction with respect to a flow of the fuel through the plurality of guide channels along a longitudinal direction of the flow guide.