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CN-117588775-B - Fuel oil mixing flame stabilizing structure, double-variable combustion chamber and engine

CN117588775BCN 117588775 BCN117588775 BCN 117588775BCN-117588775-B

Abstract

The invention relates to the technical field related to combustion devices, in particular to a fuel oil blending flame stabilizing structure, a double-variable combustion chamber and an engine. The fuel oil mixing flame stabilizing structure comprises a flame stabilizing main body, a swirler, a plurality of first nozzles, a plurality of second nozzles and a plurality of third nozzles, wherein the flame stabilizing main body is provided with a precombustion channel and a plurality of oil channel channels, one end of the precombustion channel is provided with an inlet, the other end of the precombustion channel is provided with an outlet, the first nozzles are provided with the second nozzles, the third nozzles are provided with the third nozzles, the directions of the second nozzles arranged adjacent to the oil channel channels are intersected, and the directions of the third nozzles and the precombustion channel outlet are arranged in the same direction. According to the invention, the flame stabilization of the precombustion stage is realized through the combination of the swirler and the first nozzle, the direction of the second nozzle arranged in the adjacent oil path channel is intersected, the effect of flame combination is realized, the third nozzle sprays oil to the direction of the precombustion channel outlet of the flame stabilizing main body, the flame is spread in the circumferential direction, the effect of flame combination stabilization is realized, and the flame stabilizing device is applicable to the outer ring of the double-change combustion chamber, so that the outer ring flame stabilization of the double-change combustion chamber is realized.

Inventors

  • WANG JIANCHEN
  • WANG YUZHUO
  • DUAN WEI
  • WANG JICHENG
  • MENG CHUNYU

Assignees

  • 北京航空航天大学

Dates

Publication Date
20260505
Application Date
20231109

Claims (7)

  1. 1. A fuel blending flame stabilizing structure for an outer ring of a dual-change combustion chamber, comprising: The flame stabilizing main body (10) is provided with a pre-combustion channel (11) and a plurality of oil channel channels (12), the flame stabilizing main body (10) comprises a shell (13) and a plurality of support plates (14), the two opposite ends of the shell (13) are communicated and arranged to form the pre-combustion channel (11), the support plates (14) are arranged at intervals and circumferentially on the outer side wall of the shell (13), each support plate (14) is internally provided with the oil channel (12), one end of the pre-combustion channel (11) is provided with an inlet (111), the other end of the pre-combustion channel (11) is provided with an outlet (112), and the oil channel (12) are arranged circumferentially around the pre-combustion channel (11) at intervals; A cyclone (20) provided in the pre-combustion passage (11); The first nozzles (30) are arranged on the shell (13), each first nozzle (30) corresponds to each oil path channel (12) one by one, and the oil path channels (12) are communicated with the precombustion channels (11) through the first nozzles (30); a plurality of second nozzles (40) arranged on the flame stabilizing main body (10), wherein the second nozzles (40) are used for being in contact fit with air, each oil path channel (12) is provided with a corresponding second nozzle (40), and the second nozzles (40) are communicated with the oil path channels (12); The third nozzles (50) are arranged on the flame stabilizing main body (10), the third nozzles (50) are used for being in contact fit with air, at least part of the oil path channels (12) are provided with the corresponding third nozzles (50), and the third nozzles (50) are communicated with the oil path channels (12); Wherein the second nozzles (40) are arranged on two opposite side walls of each support plate (14), the orientations of the second nozzles (40) arranged adjacent to the oil path channels (12) are intersected, and the orientations of the third nozzles (50) and the orientations of the outlets (112) of the pre-combustion channels (11) are arranged in the same direction; -said second nozzles (40) are arranged on one side wall of each of said support plates (14) in a direction perpendicular to the centre line of said prechamber (11) of said housing (13), and said third nozzles (50) are arranged on at least part of the other side wall of said support plates (14) in a direction perpendicular to the centre line of said housing (13), both said second nozzles (40) and said third nozzles (50) being oriented to intersect; Each first nozzle (30) is arranged at a position deviating from the middle part of the length direction of the shell (13), each first nozzle (30) is close to the inlet (111) of the precombustion channel (11), and the distance between the first nozzle (30) and the outlet (112) of the precombustion channel (11) is larger than the distance between the first nozzle (30) and the inlet (111) of the precombustion channel (11).
  2. 2. The fuel blending flame holding structure according to claim 1, wherein the second nozzle (40) is provided protruding from an outer side wall of the support plate (14).
  3. 3. The fuel blending flame holding structure according to claim 1, wherein the second nozzles (40) of the opposite side walls of each of the support plates (14) are arranged offset in the direction of the support plates (14).
  4. 4. The fuel blending flame stabilizing structure according to claim 1, wherein the number of the support plates (14) is four, the housing (13) is provided with a first direction and a second direction, the support plates (14) are respectively arranged along two opposite side walls of the housing (13) in the first direction, and the support plates (14) are respectively arranged along two opposite side walls of the housing (13) in the second direction; Wherein the third nozzles (50) are arranged along the support plates (14) corresponding to the two opposite side walls of the housing (13) in the second direction.
  5. 5. The fuel blending flame holding structure according to claim 1 or 4, characterized in that the support plate (14) is of a unitary structure with the housing (13).
  6. 6. A dual-variant combustion chamber comprising the fuel blending flame holding structure of any of claims 1 to 5.
  7. 7. An engine comprising the dual variable combustion chamber of claim 6.

Description

Fuel oil mixing flame stabilizing structure, double-variable combustion chamber and engine Technical Field The invention relates to the technical field related to combustion devices, in particular to a fuel oil blending flame stabilizing structure, a double-variable combustion chamber and an engine. Background The high-through-flow double-variable-cycle engine integrally adopts a double-variable-cycle overall scheme, and through combination switching between a core engine duct and a plurality of ducts, two working modes of turbofan and turbojet are realized, and economy of low-speed sub-inspection, economy and acceleration of medium-speed supersonic flight and high-speed continuous high thrust requirements are considered, so that a key effect is played in the high-through-flow double-variable-cycle engine by adopting a combustion mode of a double-variable combustion chamber in the double-variable-cycle overall scheme. The double-variable combustion chamber is in air inlet through the outer duct and other ducts in a turbofan mode, and is in air inlet independently in a turbojet mode. The part of the double-variable combustion chamber corresponding to the incoming flow of the outer duct is called an outer ring. In the turbofan mode, the air intake of the outer duct is from pure air with the speed (40-80 m/s) and the temperature (400-930K) of the core fan, and in the turbojet mode, pure air with the medium speed (100 m/s magnitude) and the temperature (850-1270K) from the front fan and the rear fan of other ducts is obtained, so that the air intake condition of the outer ring is complex and changeable. In addition, the external ring inflow is complicated and changeable, the external duct and other ducts have far different inflow properties, and the external ring inflow is pure air with lower temperature, and the evaporation of fuel oil and the like are difficult, so that the conventional main combustion chamber or afterburner flame stabilizing mode cannot be applied to the external ring of the double-change combustion chamber, and the external ring flame stabilizing of the double-change combustion chamber cannot be realized. Disclosure of Invention The invention provides a fuel mixing flame stabilizing structure, which is used for solving the problems that in the prior art, the external ring inflow is complex and changeable, the inflow properties of an external duct and other ducts are far away, the external ring inflow is pure air with lower temperature, the fuel evaporation and the like are difficult, so that a conventional main combustion chamber or afterburner flame stabilizing mode cannot be applied to the external ring of a double-change combustion chamber, and the external ring flame stabilization of the double-change combustion chamber cannot be realized. The invention provides a fuel oil mixing flame stabilizing structure, which is used for an outer ring of a double-variable combustion chamber and comprises the following components: The flame stabilizing main body is provided with a precombustion channel and a plurality of oil channel channels, one end of the precombustion channel is provided with an inlet, the other end of the precombustion channel is provided with an outlet, and the plurality of oil channel channels are arranged at intervals around the precombustion channel in a circumferential direction; the cyclone is arranged in the precombustion channel; The first nozzles are arranged on the flame stabilizing main body, each first nozzle corresponds to each oil path channel one by one, and the oil path channels are communicated with the precombustion channels through the first nozzles; The second nozzles are arranged on the flame stabilizing main body and are used for being in contact fit with air, and each oil path channel is provided with a corresponding second nozzle which is communicated with the oil path channel; The third nozzles are arranged on the flame stabilizing main body and are used for being in contact fit with air, at least part of the oil path channels are provided with corresponding third nozzles, and the third nozzles are communicated with the oil path channels; wherein the orientations of the second nozzles arranged adjacent to the oil passage intersect, and the orientations of the third nozzles are arranged in the same direction as the orientations of the outlets of the pre-combustion passage. According to the fuel oil blending flame stabilizing structure provided by the invention, the flame stabilizing main body comprises: the two opposite ends of the shell are communicated to form the pre-combustion channel, and the first nozzles are arranged on the shell; The support plates are arranged at intervals and circumferentially on the outer side wall of the shell, and each support plate is internally provided with the oil path channel; The second nozzles are arranged on one side wall of each support plate in the direction perpendicular to the central line of the precombustion cha