Central staged combustion chamber with self-excited sweeping oscillating fuel injection nozzles

A central staged combustion chamber with self-excited sweeping oscillating fuel injection nozzles, comprising:

• an outer housing with a cavity inside, a main stage coaxially disposed with the outer housing, and a pilot stage coaxially disposed with the outer housing, wherein
• the main stage is disposed inside the outer housing, a main stage swirler is disposed between a main body of the main stage and an inner wall surface of the outer housing to form a primary swirling passage, an annular fuel passage is also disposed inside the main body of the main stage, and the fuel passage is suitable for being connected with an oil pipeline;
• the main body is provided with a plurality of self-excited sweeping oscillating fuel injection nozzles communicated with the fuel passage in a direction facing away from a direction of an incoming flow, and the self-excited sweeping oscillating fuel injection nozzles are suitable for injecting oscillating liquid fuel into the primary swirling passage,
• wherein the main stage comprises an outer interstage section and an inner interstage section, wherein
• the outer interstage section comprises a circular housing, the main stage swirler disposed on an outer side of the circular housing, and an oil guiding flange disposed at one end of the circular housing and extending to an axis of the circular housing;
• the oil guiding flange is provided with the plurality of self-excited sweeping oscillating fuel injection nozzles in the direction facing away from the direction of an incoming flow, and the oil guiding flange is also provided with a plurality of oil guiding holes corresponding to the plurality of self-excited sweeping oscillating fuel injection nozzles;
• and
• a maximum outer diameter of the inner interstage section is smaller than an inner diameter of the circular housing, and an end of the inner interstage section is suitable for abutting with the oil guiding flange, so as to form the circular-ring-shaped fuel passage communicated with the plurality of oil guiding holes.