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CN-122014476-A - Ignition device and internal combustion engine

CN122014476ACN 122014476 ACN122014476 ACN 122014476ACN-122014476-A

Abstract

The invention provides an ignition device and an internal combustion engine. The porous piece is provided with a core hole site and at least one group of expansion hole sites, each group of expansion hole sites are distributed at intervals along the circumferential direction of the core hole site, the combustion starting part is arranged on one side of the porous piece and corresponds to the core hole site, and the combustion starting part can trigger the self-sustaining combustion of the ammonia gas mixture in the core hole site. The high-temperature flame generated by the combustion of the ammonia gas mixture in the core hole site is diffused to one side of the porous piece far away from the combustion starting part under the guidance of the wall surface of the core hole site, and simultaneously, the ammonia gas mixture in the expansion hole site is rapidly heated and combusted under the heat radiation effect of the high-temperature flame and the heat conduction effect of the wall surface between the expansion hole site and the core hole site, so that a chained combustion propagation path from inside to outside is formed, a plurality of synchronous developed local flame sources are formed, the total volume and the free radical concentration of an initial combustion area are enlarged, and the ignition success rate and the stability are improved.

Inventors

  • Lin Zhelong
  • WANG ZHI
  • QI YUNLIANG
  • CHEN QINGCHU

Assignees

  • 清华大学

Dates

Publication Date
20260512
Application Date
20260126

Claims (10)

  1. 1. An ignition device, comprising: A porous member (1) having a core hole site (2) and at least one set of expansion hole sites (3), each set of expansion hole sites (3) being spaced apart along a circumferential direction of the core hole site (2); the combustion starting part is arranged on one side of the porous piece (1), corresponds to the core hole site (2), and can trigger the self-sustaining combustion of the ammonia mixture in the core hole site (2).
  2. 2. An ignition device according to claim 1, wherein the cross-sectional shapes of the core hole site (2) and the expansion hole site (3) are each regular hexagons, the porous member (1) having a set of the expansion hole sites (3), a set of the expansion hole sites (3) including six of the expansion hole sites (3); the center of any one of the expansion hole sites (3) and the straight line where the center of the core hole site (2) is located are used as a center connecting line, and a group of opposite sides of any one of the expansion hole sites (3) and a group of opposite sides of the core hole site (2) are perpendicular to the center connecting line.
  3. 3. The ignition device according to claim 2, characterized in that the side length of the regular hexagon is 1-2 mm, and the wall thickness between any two adjacent core hole sites (2) and each expansion hole site (3) is 0.5-1 mm; The axial dimension of the porous piece (1) is the dimension of the porous piece (1) along the axial direction of the core hole site (2), and the axial dimension of the porous piece (1) is 1-2 mm.
  4. 4. An ignition device according to claim 1, characterized in that the porous member (1) is made of nickel-based alloy, ruthenium-based alloy, iridium-based alloy, platinum-based alloy or iron-based alloy; Or the side wall of the core hole site (2) and the side wall of the extension hole site (3) are provided with a catalyst layer including at least one of a nickel-based catalyst, a ruthenium-based catalyst, an iridium-based catalyst, a platinum-based catalyst and an iron-based catalyst.
  5. 5. Ignition device according to claim 1, characterized in that the cross-sectional shape of the core hole site (2) and the expansion hole site (3) is triangular, circular, square or regular hexagonal.
  6. 6. An ignition device according to claim 1, characterized in that the porous member (1) comprises: the porous part (8) is in a disc-shaped structure, and the core hole site (2) and the expansion hole site (3) are through holes penetrating through the porous part (8); And the connecting part (5) is fixedly arranged on one side of the porous part (8), and the connecting part (5) is used for connecting the combustion starting part.
  7. 7. The ignition device of any one of claims 1-6, wherein the combustion initiation section comprises: The first metal shell is used as a grounding end, the porous piece (1) is arranged on the first metal shell, and the porous piece (1) is in conductive connection with the first metal shell; The center electrode (4) is arranged on the first metal shell, the center electrode (4) is in insulating contact with the first metal shell, the center electrode (4) corresponds to the core hole site (2), and a discharge gap capable of being broken down is formed between the center electrode (4) and the porous piece (1).
  8. 8. The ignition device of any one of claims 1-6, wherein the combustion initiation section comprises: a second metal casing, the porous member (1) being provided to the second metal casing; and the heating element is arranged on the second metal shell, corresponds to the core hole site (2) and is used for generating a high-temperature surface after being electrified.
  9. 9. The ignition device of any one of claims 1-6, wherein the combustion initiation section comprises: A third metal casing, the porous member (1) being provided to the third metal casing; the resonant cavity is arranged on the third metal shell, the outlet of the resonant cavity corresponds to the core hole site (2), and the resonant cavity is used for forming a local strong electric field under microwave excitation so as to induce gas breakdown and generate plasma.
  10. 10. An internal combustion engine comprising an ignition device as claimed in any one of claims 1 to 9.

Description

Ignition device and internal combustion engine Technical Field The invention relates to the technical field of internal combustion engines, in particular to an ignition device and an internal combustion engine. Background With the increasingly stringent global energy structure transformation and environmental protection requirements, the traditional fossil fuel internal combustion engine faces the dual pressure of energy consumption and pollutant emission, and development of clean, low-carbon or even zero-carbon alternative fuels and adaptive efficient combustion technology thereof has become an important development direction in the field of internal combustion engines. Ammonia, which is a fuel with high hydrogen content and no carbon dioxide generated in the combustion process, has the remarkable advantages of wide sources, low liquefaction pressure, reusable storage and transportation infrastructure and the like, and has a great deal of attention on application potential in the field of internal combustion engines. However, because of the high ignition point and slow combustion speed of the ammonia fuel, the development of the ammonia fuel internal combustion engine faces technical bottlenecks such as poor ignition stability, and the like, and the clean and efficient advantages of the ammonia fuel cannot be fully exerted. Therefore, how to solve the problem of poor ignition stability of the ammonia-fueled internal combustion engine in the related art is an important technical problem to be solved by those skilled in the art. Disclosure of Invention The invention provides an ignition device and an internal combustion engine, which are used for solving the defect of poor ignition stability of an ammonia fuel internal combustion engine in the related art. The invention provides an ignition device, comprising: A porous member having a core hole site and at least one set of expansion hole sites, each set of expansion hole sites being spaced apart along a circumferential direction of the core hole site; the combustion starting part is arranged on one side of the porous piece, corresponds to the core hole site and can trigger the self-sustaining combustion of the ammonia gas mixture in the core hole site. According to the ignition device provided by the invention, the cross sections of the core hole site and the expansion hole site are regular hexagons, the porous piece is provided with a group of expansion hole sites, and a group of expansion hole sites comprises six expansion hole sites; the center of any one of the expansion hole sites and the straight line where the center of the core hole site is located are used as a center connecting line, and a group of opposite sides of any one of the expansion hole sites and a group of opposite sides of the core hole site are perpendicular to the center connecting line. According to the ignition device provided by the invention, the side length of the regular hexagon is 1-2 mm, and the wall thickness between any two adjacent core hole sites and each expansion hole site is 0.5-1 mm; The axial dimension of the porous piece is the dimension of the porous piece along the axial direction of the core hole site, and the axial dimension of the porous piece is 1-2 mm. According to the ignition device provided by the invention, the porous piece is made of nickel-based alloy, ruthenium-based alloy, iridium-based alloy, platinum-based alloy or iron-based alloy; Or the side wall of the core hole site and the side wall of the expansion hole site are provided with a catalyst layer, and the catalyst layer comprises at least one of a nickel-based catalyst, a ruthenium-based catalyst, an iridium-based catalyst, a platinum-based catalyst and an iron-based catalyst. According to the ignition device provided by the invention, the cross sections of the core hole site and the expansion hole site are triangular, circular, square or regular hexagon. According to the present invention, there is provided an ignition device, the porous member comprising: The porous part is in a disc-shaped structure, and the core hole site and the expansion hole site are through holes penetrating through the porous part; And the connecting part is fixedly arranged on one side of the porous part and is used for connecting the combustion starting part. According to the present invention, there is provided an ignition device, the combustion initiation section comprising: the first metal shell is used as a grounding end, the porous piece is arranged on the first metal shell, and the porous piece is in conductive connection with the first metal shell; The center electrode is arranged on the first metal shell, the center electrode is in insulating contact with the first metal shell, the center electrode corresponds to the core hole site, and a discharge gap capable of being broken down is formed between the center electrode and the porous piece. According to the present invention, there is provided an ignition device,