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CN-122015127-A - Flow active control heat shield and afterburner applying same

CN122015127ACN 122015127 ACN122015127 ACN 122015127ACN-122015127-A

Abstract

The invention relates to the technical field of air flow control of aeroengines, and discloses a flow active control heat shield and an afterburner applied to the heat shield, wherein the heat shield is of an annular structure and is coaxially arranged at the downstream of a flow dividing ring of the afterburner, and the heat shield also comprises a fixed throttling ring, a movable throttling ring and a driving source for driving the movable throttling ring to rotate so as to adjust the flow area of an air vent through a flow blocking assembly. The invention can realize the active control of the throttle area (the flow area of the vent hole) of the heat shield cooling channel of the integrated afterburner, realize the active control of the cooling air flow and the blending air flow in the external air flow, ensure that the cooling air flow entering the heat shield is in a stable and controllable range when the duct ratio is small, ensure the reliability of cooling design, increase the blending air flow when the duct ratio is large, improve the combustion efficiency of the afterburner, and solve the problem that the cooling air flow and the blending air flow cannot be actively controlled in the prior art.

Inventors

  • WANG CHENGQI
  • WANG YAJUN
  • ZHANG XUN
  • FENG BIN
  • HUANG XIAOFENG
  • WU XIAOFEI
  • LIN JIANFU
  • XU XINWEN

Assignees

  • 中国航发四川燃气涡轮研究院

Dates

Publication Date
20260512
Application Date
20260128

Claims (8)

  1. 1. A flow actively controlled heat shield comprising: The heat shield (1) is of an annular structure and is coaxially arranged at the downstream of the afterburner split ring (2); the fixed throttling ring (3) is coaxially fixed in an outer duct (4) between the flow dividing ring (2) and the heat shield (1), and a plurality of vent holes (5) are uniformly formed in the fixed throttling ring (3) in the circumferential direction; The movable throttling ring (6) is coaxially and movably arranged in the afterburner outdoor duct (4), and a plurality of flow blocking components matched with the vent holes (5) are arranged on the movable throttling ring (6); the driving source is used for driving the movable throttling ring (6) to rotate so as to adjust the flow area of the vent hole (5) through the flow blocking assembly.
  2. 2. The active flow control heat shield according to claim 1, wherein the vent holes (5) comprise a first air flow hole (501) near the inner ring of the fixed throttle ring (3) and a second air flow hole (502) near the outer ring of the fixed throttle ring (3), each first air flow hole (501) having an area smaller than an area of the second air flow hole (502).
  3. 3. The flow active control heat shield of claim 2 wherein the first air flow aperture (501) or the second air flow aperture (502) is a porous structure comprised of a single aperture or a plurality of aperture structures.
  4. 4. A flow active control heat shield according to claim 1, characterized in that the drive source comprises a drive motor (9), a gear (10) is arranged on a transmission shaft of the drive motor (9), and a driven rack (11) meshed with the gear (10) is arranged on the movable throttling ring (6).
  5. 5. The flow active control heat shield according to claim 1, wherein a positioning groove is formed in the inner wall of an outer casing (7) of the outer duct (4), and a limiting assembly (13) matched with the positioning groove is arranged on the movable throttling ring (6).
  6. 6. Afterburner, characterized by an active flow control heat shield (1) according to any one of claims 1-5.
  7. 7. Afterburner according to claim 6, characterized in that a central cone (14) is also provided in the splitter ring (2), an inner duct being formed between the outer wall of the central cone (14) and the inner wall of the splitter ring (2), a flame stabilizer (15) being provided in the inner duct.
  8. 8. Afterburner according to claim 7, characterized in that the splitter ring (2) is further provided with bleed air channels (8), which bleed air channels (8) are used for introducing the air flow of the outer duct (4) into the inner duct.

Description

Flow active control heat shield and afterburner applying same Technical Field The invention relates to the technical field of air flow control of aeroengines, and discloses a flow active control heat shield and an afterburner applied to the heat shield. Background The current aviation turbofan engine has a large range of duct ratio variation in a flight envelope, so that the cooling air flow entering the afterburner heat shield in different duct ratio states is greatly fluctuated, the minimum value of the cooling air flow is usually limited to ensure the heat shield cooling performance of the afterburner, and the cooling air flow in a large duct ratio state is far greater than the actually required cooling air flow, so that surplus cooling air does not enter the connotation to participate in combustion, and the combustion efficiency of the afterburner is influenced. Disclosure of Invention The invention aims to provide a flow active control heat shield and an afterburner applied to the same, which can ensure that the cooling air flow entering the heat shield is in a stable and controllable range when the bypass ratio is small, ensure the reliability of cooling design, and simultaneously increase the blending air flow when the bypass ratio is large, improve the combustion efficiency of the afterburner and solve the problem that the cooling air flow and the blending air flow cannot be actively controlled in the prior art. In order to achieve the technical effects, the technical scheme adopted by the invention is as follows: a flow actively controlled heat shield comprising: the heat shield is of an annular structure and is coaxially arranged at the downstream of the afterburner split ring; The fixed throttling ring is coaxially fixed in the outer duct between the flow dividing ring and the heat shield, and a plurality of vent holes are uniformly formed in the fixed throttling ring in the circumferential direction; the movable throttling ring is coaxially and movably arranged in the afterburner outdoor duct, and a plurality of flow blocking assemblies matched with the vent holes are arranged on the movable throttling ring; the driving source is used for driving the movable throttling ring to rotate so as to adjust the flow area of the vent hole through the flow blocking assembly. Further, the vent holes comprise first air flow holes close to the inner ring of the fixed throttling ring and second air flow holes close to the outer ring of the fixed throttling ring, and the area of each first air flow hole is smaller than that of each second air flow hole. Further, the first air flow hole or the second air flow hole is a porous structure formed by a single hole or a plurality of hole structures. Further, the driving source comprises a driving motor, a gear is arranged on a transmission shaft of the driving motor, and a driven rack meshed with the gear is arranged on the movable throttling ring. Further, a positioning groove is formed in the inner wall of the outer casing of the outer duct, and a limiting assembly matched with the positioning groove is arranged on the movable throttling ring. In order to achieve the technical effects, the invention also provides an afterburner with the flow active control heat shield. Further, a central cone is further arranged in the flow dividing ring, an inner duct is formed between the outer wall of the central cone and the inner wall of the flow dividing ring, and a flame stabilizer is arranged in the inner duct. Further, the diverter ring is further provided with a bleed air channel, and the bleed air channel is used for introducing the air flow of the outer duct into the inner duct. Compared with the prior art, the invention has the beneficial effects that the active control of the throttling area (the flow area of the vent hole) of the cooling channel of the integrated afterburner heat shield can be realized, the active control of the cooling air flow and the blending air flow in the external air flow is realized, the cooling air flow entering the heat shield in a small bypass ratio is ensured to be in a stable and controllable range, the reliability of cooling design is ensured, and meanwhile, the blending air flow is increased in a large bypass ratio, and the combustion efficiency of the afterburner is improved. Drawings FIG. 1 is a schematic illustration of an exemplary afterburner configuration incorporating a flow active control heat shield; FIG. 2 is a schematic diagram illustrating the cooperation of a fixed throttle ring and a movable throttle ring according to an embodiment; FIG. 3 is a schematic structural view of a first airflow hole and a second airflow hole according to an embodiment; The flame stabilizer comprises a heat shield, a split ring, a fixed throttling ring, an outer duct, a vent hole, a first air flow hole, a second air flow hole, a movable throttling ring, an outer casing, a gas introducing channel, a driving motor, a gear, a driven rack, a rotatin