Search

CN-121993817-A - Fuel oil intensified atomization cracking device with high-voltage discharge of circular combustion chamber

CN121993817ACN 121993817 ACN121993817 ACN 121993817ACN-121993817-A

Abstract

The invention discloses a fuel oil intensified atomization pyrolysis device for high-voltage discharge of a circular combustion chamber, which is arranged in the combustion chamber, wherein a flame tube is arranged in the combustion chamber and comprises a high-pressure fuel spray tube and a circular evaporation tube, the high-pressure fuel spray tube penetrates through the side wall of the combustion chamber and is connected with a high-voltage power supply to serve as an anode, the circular evaporation tube penetrates through the side wall of the flame tube to serve as a cathode, an anode oil injection port of the high-pressure fuel spray tube and a cathode expansion type oil injection port of the circular evaporation tube are coaxially arranged, and the end part of the anode oil injection port extends into the cathode expansion type oil injection port. Through high-voltage arc discharge, the fuel oil is not only physically promoted to be split into tiny liquid drops, but also is partially split into micromolecular fuel with higher chemical activity, so that the chemical reaction rate is greatly improved, and the quick and full combustion of the fuel oil is realized.

Inventors

  • ZHAO BINGBING
  • ZOU KEXUAN
  • XU XIN
  • Shi Guanghao

Assignees

  • 中国人民解放军空军工程大学

Dates

Publication Date
20260508
Application Date
20251225

Claims (9)

  1. 1. The fuel oil intensified atomization pyrolysis device for the high-pressure discharge of the circular combustion chamber is arranged in the combustion chamber, and a flame tube is arranged in the combustion chamber, and is characterized by comprising a high-pressure fuel oil spray pipe (1) and a circular evaporation pipe (2); The high-pressure fuel spray pipe (1) comprises a tail fuel receiving channel (9), a middle mounting seat (8) and an anode fuel spray section (7) which are sequentially connected and communicated along the fuel passing direction; The return-type evaporation tube (2) comprises a cathode expansion type fuel oil port (11), a U-shaped fuel oil evaporation channel (12) and a contraction type fuel oil outlet (13) which are sequentially connected and communicated along the fuel oil passing direction; The high-pressure fuel spray pipe (1) penetrates through the side wall of the combustion chamber and is connected with a high-voltage power supply to serve as an anode, and the return-type evaporation pipe (2) penetrates through the side wall of the flame tube to serve as a cathode; The anode oil injection port (7) of the high-pressure fuel injection pipe (1) and the cathode expansion type fuel oil port (11) of the return-type evaporation pipe (2) are coaxially arranged, and the end part of the anode oil injection port (7) extends into the cathode expansion type fuel oil port (11).
  2. 2. The fuel oil intensified atomization and cracking device with the high-pressure discharge of the circular combustion chamber according to claim 1, wherein the anode oil injection section (7) comprises a discharge anode head (6) and an oil delivery pipeline (16); The discharging anode head (6) comprises a discharging section (17), a central conductor section (14) and a tail cable connecting section (10) which are connected in sequence; the central conductor section (14) and the tail cable connecting section (10) are arranged in the oil pipeline (16) in a penetrating mode, and the discharging section (17) is positioned outside the oil pipeline (16) and provided with a threaded discharging electrode; The diameter of the central conductor section (14) is larger than the diameter of the discharge section (17) and the tail cable connecting section (10) and smaller than the inner diameter of the oil conveying pipeline (16); The end face of the oil conveying pipeline (16) is in closed connection with the end face of the central conductor section (14) through an inclined plane; A plurality of oil spraying ports (15) are uniformly formed in the inclined plane along the circumferential direction.
  3. 3. The fuel oil intensified atomization and cracking device for the high-voltage discharge of the circular combustion chamber according to claim 1, wherein the middle mounting seat (8) is made of an insulating material and comprises an external thread section and a hexagonal base which are used for being in threaded connection with the outer wall (3) of the combustion chamber.
  4. 4. The fuel oil intensified atomization pyrolysis device for the high-voltage discharge of the circular combustion chamber according to claim 1, wherein the cathode expansion fuel oil port (11) is horn-shaped and penetrates through the side wall of the flame tube, the small-diameter end of the cathode expansion fuel oil port (11) is aligned with the inner wall (5) of the flame tube, and the large-diameter end of the cathode expansion fuel oil port (11) is aligned with the outer wall (4) of the flame tube.
  5. 5. The fuel-oil intensified atomization and cracking device with the back-shaped combustion chamber and high-voltage discharge according to claim 1, wherein the U-shaped fuel evaporation channel (12) is of a three-section U-shaped structure.
  6. 6. The fuel oil intensified atomization and cracking device with the circular combustion chamber and the high-voltage discharge according to claim 1, wherein the contracted fuel oil outlet (13) is in a horn shape, the large diameter end of the contracted fuel oil outlet (13) is connected with the U-shaped fuel oil evaporation channel (12), and the small diameter end of the contracted fuel oil outlet (13) is arranged at the front end of the combustion chamber.
  7. 7. The fuel-oil intensified atomization and cracking device for the high-voltage discharge of the circular combustion chamber according to claim 2, wherein the central conductor section (14) is connected with the tail cable connecting section (10) in an inclined and excessive way.
  8. 8. The fuel oil intensified atomization cracking device with the high-voltage discharge of the circular combustion chamber according to claim 1, wherein the fuel oil inlet end of the tail oil receiving channel (9) is provided with an inward conical cutting surface.
  9. 9. The fuel-oil intensified atomization and cracking device with the back-shaped combustion chamber and high-voltage discharge according to claim 1, wherein the fuel evaporation channel (12) is made of metal.

Description

Fuel oil intensified atomization cracking device with high-voltage discharge of circular combustion chamber Technical Field The invention belongs to the technical field of aviation power plasma ignition and combustion enhancement, and particularly relates to a fuel oil enhanced atomization cracking device with a high-voltage discharge of a circular combustion chamber. Background Along with the continuous progress of aviation industry technology in China, higher requirements are put forward on high thrust-weight ratio and high-efficiency stress application of an aircraft engine. Currently, due to the restriction of factors such as material performance, engineering technology and basic principles, the development of a conventional main combustion chamber gradually approaches to the design limit, and the unconventional combustion technologies such as rotary detonation, turbine inter-stage combustion and the like are not mature, so that the flexible-design and convenient-to-apply afterburning technology is widely focused. The new generation of afterburners of aeroengines is moving towards higher inlet temperatures, lower oxygen concentrations, higher flow rates and higher exhaust temperatures, which tend to present serious challenges to the combustion organization, especially in high flow afterburners, where the flow rate of the main combustion zone tends to exceed the flame propagation speed, resulting in difficult direct ignition, and where some of the afterburners of aeroengines are required to rely on a pre-combustion chamber to provide a low velocity rich zone for flame stabilization. At the same time, the miniature gas turbine engine has great potential in military and civil fields, but the miniature combustion chamber is taken as a core component and has inherent defects due to size limitation, namely, the combustion chamber has the advantages of easy flameout caused by overlarge surface area to volume ratio, insufficient mixing of fuel and air caused by short length of the combustion chamber, and incapability of arranging a swirl device due to space limitation, and the problems seriously restrict the thrust and the service life of the engine. In the two combustion chambers, the evaporation device plays a key role in ignition and combustion efficiency, and the evaporation tube has a wide application prospect due to the advantages of small volume, simple structure and the like. The existing main stream evaporating pipe structure mainly comprises an L-shaped structure, a straight cylinder structure and a return structure, but most of the wall surfaces of the evaporating pipe structure still adopt smooth designs, so that the fuel oil residence time is short, the evaporation rate is low, and the evaporating pipe structure is one of the core bottlenecks of low thrust and short service life of a miniature gas turbine engine. To increase the evaporation rate, high-voltage discharge technology has been introduced into the field of combustion enhancement due to its strong energy and physicochemical activity, such as corona discharge and high-voltage electrostatic atomization technology, which have been used in industrial spraying and combustion, however, in the prior art, either only high-voltage discharge is used to improve atomization or only evaporation tube structure is optimized to extend residence time, and the two technologies cannot be cooperated. In particular, the prior art has not realized the fuel intensified atomization and the macromolecule cracking synchronously by utilizing the sliding arc plasma through arranging a high-voltage electric field on a loop-shaped evaporation tube, thereby simultaneously solving the multiple problems of short fuel residence time, low atomization efficiency and slow chemical reaction rate in a compact space. Therefore, development of a novel device capable of combining the advantages of high-voltage discharge cracking and long retention time of a return-type evaporating tube is needed, and a feasible path is provided for solving the technical problems of insufficient and uneven combustion of the current aeroengine. Disclosure of Invention The invention aims to provide a fuel oil intensified atomization pyrolysis device with a circular combustion chamber and high-pressure discharge, which is applied to an afterburner of an aeroengine and a combustion chamber of a miniature gas turbine engine, and improves fuel oil atomization efficiency and combustion stability through a high-pressure discharge technology so as to solve the problems in the background technology. In order to achieve the above object, the present invention provides the following solutions: The fuel oil intensified atomization cracking device for the high-pressure discharge of the circular combustion chamber is arranged in the combustion chamber, and a flame tube is arranged in the combustion chamber and comprises a high-pressure fuel oil spray pipe and a circular evaporation pipe; The high-pressure fuel s