CN114576039A - Pintle injector capable of realizing multidimensional impact atomization and injection method - Google Patents
Pintle injector capable of realizing multidimensional impact atomization and injection method Download PDFInfo
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- CN114576039A CN114576039A CN202210478690.6A CN202210478690A CN114576039A CN 114576039 A CN114576039 A CN 114576039A CN 202210478690 A CN202210478690 A CN 202210478690A CN 114576039 A CN114576039 A CN 114576039A
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- injection
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/42—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof using liquid or gaseous propellants
- F02K9/44—Feeding propellants
- F02K9/52—Injectors
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention provides a pintle injector capable of realizing multidimensional impact atomization and an injection method, and solves the problem that when the propellant flow of the conventional pintle injector is larger, the impact atomization of the propellant is influenced by the larger spray hole size, and further the combustion performance is influenced. The injector comprises a central barrel and a central rod; the central rod comprises a connecting rod arranged in the central cylinder and an end cover arranged at the lower end of the connecting rod, a distance exists between the end cover and the lower end face of the central cylinder, and an injection circular seam communicated with the inner cavity of the central cylinder is formed between the end cover and the lower end face of the central cylinder; the lower end face of the central cylinder is provided with a plurality of circumferentially arranged supporting teeth which are in contact with the upper end face of the end cover, and a plurality of circumferentially arranged jetting groove groups; the support teeth and the injection groove group are arranged in a staggered manner; the injection groove group comprises at least one injection groove which radially penetrates through the central cylinder and is communicated with the injection annular seam.
Description
Technical Field
The invention relates to a pintle injector, in particular to a pintle injector capable of realizing multidimensional impact atomization and an injection method.
Background
The central propellant of the pintle injector flows from top to bottom in the central cylinder and is sprayed out from the spray holes at the end of the central cylinder, the commonly used spray hole structure at the end of the central cylinder is a round hole type, the size of the spray hole has obvious influence on combustion performance, when the flow of the propellant is large, the design size of the spray hole is increased, and the larger size of the spray hole influences impact atomization of the propellant and further influences the combustion performance.
Disclosure of Invention
The invention provides a pintle injector capable of realizing multidimensional impact atomization and an injection method, and aims to solve the technical problem that when the propellant flow of the conventional pintle injector is larger, the impact atomization of the propellant is influenced by the larger spray hole size, and further the combustion performance is influenced.
In order to realize the purpose, the technical scheme provided by the invention is as follows:
a pintle injector capable of realizing multidimensional impact atomization is characterized in that: comprises a central cylinder and a central rod;
the central rod comprises a connecting rod arranged in the central cylinder and an end cover arranged at the lower end of the connecting rod, a distance exists between the end cover and the lower end face of the central cylinder, and an injection circular seam communicated with the inner cavity of the central cylinder is formed between the end cover and the lower end face of the central cylinder;
the lower end face of the central cylinder is provided with a plurality of circumferentially arranged supporting teeth which are in contact with the upper end face of the end cover, and a plurality of circumferentially arranged injection groove groups; the supporting teeth and the jetting groove groups are arranged in a staggered manner;
the injection groove group comprises at least one injection groove which radially penetrates through the central cylinder and is communicated with the injection annular seam.
Further, each injection groove group comprises 2 injection grooves, and the injection circumferential seam height between the 2 injection grooves is larger than that of the rest positions.
Furthermore, the supporting teeth and the injection groove groups are uniformly distributed along the circumferential direction of the central cylinder.
Further, the injection groove is U-shaped.
Furthermore, a support frame is arranged on the inner wall of the central cylinder, and the connecting rod penetrates through the support frame in a threaded connection mode.
Meanwhile, the invention also provides an injection method capable of realizing multidimensional impact atomization, which is characterized by comprising the following steps:
uniformly injecting a first propellant downwards outside the circumference of a central barrel of the needle-latch injector;
a plurality of first liquid regions circumferentially distributed at the bottom end of the central barrel of the needle-tying injector radially inject a cylindrical second propellant, and a plurality of second liquid regions circumferentially distributed at the bottom end radially inject a fan-shaped second propellant; the first liquid areas and the second liquid areas are distributed in a staggered mode along the circumferential direction; the flow rate of the second propellant in the second liquid zone is less than the flow rate of the second propellant in the first liquid zone;
the first propellant is respectively impacted and atomized with the cylindrical second propellant and the fan-shaped second propellant.
Furthermore, a plurality of circumferentially distributed supporting teeth are arranged at the bottom end of the central barrel of the needle-latch injector, the supporting teeth serve as liquid-free areas, and the first liquid areas, the second liquid areas and the liquid-free areas are circumferentially distributed in a staggered mode.
Compared with the prior art, the invention has the advantages that:
1. the pintle injector of the invention adopts an injection structure combining an injection groove and an injection circular seam, and compared with the existing structure adopting a single injection hole, the pintle injector can ensure that the size of the injection groove part is not changed and the combustion performance is not adversely affected particularly under the condition of large flow; in addition, the supporting teeth at the end of the central cylinder can prevent the injection structure from thermally deforming in the ignition working process.
2. The injection groove group comprises 2 injection grooves, the height of an injection annular seam (a first gap) between the 2 injection grooves is larger than that of injection annular seams (a second gap) at other positions, and the first gap with larger height is not enough to cause larger influence on the injection area when a central rod is slightly deformed in the working process due to larger area of the first gap, so that the first gap is designed to be higher in height, and the injection stability can be ensured under the condition of meeting the large flow; in addition, after the injection structure combining the injection groove and the injection circular seam impacts with the propellant on the outer ring (the outer side of the circumference of the central cylinder), the distribution gradient of the fog beams is enriched, and the combustion performance is favorably improved.
Drawings
FIG. 1 is a schematic diagram of a pintle injector capable of realizing multi-dimensional impact atomization according to the present invention;
FIG. 2 is a schematic representation of a first configuration of an injector block set according to an embodiment of the present invention;
FIG. 3 is a schematic representation of a second configuration of an injector block set according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a spray beam deployment pattern after impact of a propellant in a second configuration of an injection slot set according to an embodiment of the present invention;
wherein the reference numbers are as follows:
1-a central cylinder, 11-supporting teeth, 12-an injection groove group, 121-an injection groove and 13-a supporting frame;
2-center rod, 21-connecting rod, 22-end cap;
3-injection circular seam, 31-first seam and 32-second seam.
Detailed Description
The invention is described in further detail below with reference to the figures and specific embodiments.
As shown in fig. 1, the invention relates to a pintle injector capable of realizing multidimensional impact atomization, which comprises a central barrel 1 and a central rod 2.
The central rod 2 comprises a connecting rod 21 arranged in the central cylinder 1 and an end cover 22 arranged at the lower end of the connecting rod 21, a distance exists between the end cover 22 and the lower end surface of the central cylinder 1, and an injection annular seam 3 communicated with the inner cavity of the central cylinder 1 is formed between the end cover 22 and the lower end surface of the central cylinder; specifically, a support frame 13 is arranged on the inner wall of the central cylinder 1, a threaded hole is formed in the support frame 13, the connecting rod 21 penetrates through the threaded hole, and an external thread matched with the threaded hole is formed in the outer surface of the upper end of the connecting rod 21; the support 13 is provided with a plurality of through holes for the propellant to flow through in the circumferential direction.
The lower end face of the central cylinder 1 is provided with a plurality of circumferentially arranged supporting teeth 11 which are contacted with the upper end face of the end cover 22, and a plurality of circumferentially arranged injection groove groups 12; the supporting teeth 11 and the jetting groove groups 12 are arranged in a staggered mode along the circumferential direction of the central cylinder 1, preferably, the supporting teeth 11 are uniformly distributed along the circumferential direction of the central cylinder 1, and the jetting groove groups 12 are also uniformly distributed along the circumferential direction of the central cylinder 1; the injection groove group 12 comprises at least one injection groove 121 which radially penetrates through the side wall of the lower end face of the central barrel 1 and is communicated with the injection annular slot 3.
The machining process of the center tube 1 in the embodiment is as follows: firstly, designing and processing a discontinuous circumferential seam structure on the lower end face of a central cylinder 1, then designing and processing an injection groove 121 on the upper part of the circumferential seam structure, and forming support teeth 11 between the circumferential seam structure and the circumferential seam structure at the end of the central cylinder 1; the upper end surface of the end cover 22 is attached to the end surface of the support tooth 11 of the central cylinder 1 to form an injection structure with an injection groove combined with a circular seam; the number of the support teeth 11 and the number of the injection slots 121 per injection slot group 12 are designed appropriately according to specific requirements. The injection groove 121 of the present embodiment has a U-shape; in other embodiments, the cross-sectional shape of the injection groove 121 may be designed to be circular or triangular according to actual needs.
The present embodiment shows two structural forms of the injection groove set 12:
first, as shown in fig. 2, the injection groove group 12 includes 2 injection grooves 121, and the injection circumferential gap height between the injection grooves 121 is equal to the injection circumferential gap height between the injection grooves 121 and the supporting teeth 11.
Secondly, as shown in fig. 3, the injection groove group 12 includes 2 injection grooves 121, and preferably, the injection circumferential seam height between the 2 injection grooves 121 is greater than the injection circumferential seam height at the other positions, in the present embodiment, two kinds of gaps with different heights are designed, the injection circumferential seam between the 2 injection grooves 121 is defined as a first gap 31, the injection circumferential seam at the other positions is defined as a second gap 32, and the height of the first gap 31 is greater than the height of the second gap 32, so that, in the working process, when the central rod 2 is slightly deformed, the injection area is not greatly affected enough, and therefore, the height of the first gap 31 is designed to be relatively high, so that the injection stability can be ensured under the condition of satisfying the injection stability; in addition, after the second propellant sprayed by the spraying structure formed by combining the spraying grooves 121 and the spraying circumferential seams 3 collides with the first propellant on the outer ring (the outer side of the circumference of the central cylinder 1), a mist beam spreading mode shown in fig. 4 is formed, wherein a, b, c and d in the drawing are respectively a mist beam at the supporting teeth, a gap two collision mist beam, a gap one collision mist beam and a spraying groove collision mist beam.
Based on the pintle injector capable of realizing multidimensional impact atomization, the embodiment provides an injection method capable of realizing multidimensional impact atomization, which includes:
uniformly jetting a first propellant downwards outside the circumference of a central barrel 1 of the needle-tying injector;
a jet groove 121 (a first liquid area) at the bottom end of a central barrel 1 of the needle-bolt injector radially injects a cylindrical high-flow second propellant, and a jet annular seam (a second liquid area) radially injects a fan-shaped low-flow second propellant; the supporting teeth 11 at the bottom end of the central barrel 1 of the needle-jet injector act as liquid-free areas,
the first propellant, the columnar high-flow second propellant and the fan-shaped low-flow second propellant are respectively impacted and atomized.
The pintle injector of the embodiment adopts an injection structure formed by combining the injection groove 121 and the injection annular seam 3, compared with the traditional single injection hole structure, the design structure is flexible, particularly, under the condition of large flow, the connecting rod 21 is arranged on the supporting frame 13 in a threaded connection mode in a penetrating mode, the size of the injection annular seam 3 can be gradually increased, the design ensures that the size of the slotted part is not changed, the adverse effect on combustion performance is not generated, and in addition, the supporting teeth 11 at the end of the central cylinder 1 can prevent the thermal deformation of the injection structure in the ignition working process.
The above description is only for the preferred embodiment of the present invention and does not limit the technical solution of the present invention, and any modifications made by those skilled in the art based on the main technical idea of the present invention belong to the technical scope of the present invention.
Claims (7)
1. A pintle injector capable of realizing multidimensional impact atomization, which is characterized in that: comprises a central cylinder (1) and a central rod (2);
the central rod (2) comprises a connecting rod (21) arranged in the central cylinder (1) and an end cover (22) arranged at the lower end of the connecting rod (21), the end cover (22) and the lower end face of the central cylinder (1) are separated by a distance, and an injection annular seam (3) communicated with the inner cavity of the central cylinder (1) is formed between the end cover (22) and the lower end face of the central cylinder (1);
the lower end face of the central cylinder (1) is provided with a plurality of circumferentially arranged supporting teeth (11) which are in contact with the upper end face of the end cover (22), and a plurality of circumferentially arranged injection groove groups (12); the supporting teeth (11) and the injection groove groups (12) are arranged in a staggered manner;
the injection groove group (12) comprises at least one injection groove (121) which radially penetrates through the central cylinder (1) and is communicated with the injection annular seam (3).
2. The pintle injector capable of achieving multidimensional impact atomization according to claim 1, wherein: each injection groove group (12) comprises 2 injection grooves (121), and the injection circumferential weld height between the 2 injection grooves (121) is larger than that of the rest positions.
3. The pintle injector capable of realizing multidimensional impact atomization according to claim 2, wherein: the supporting teeth (11) and the injection groove groups (12) are uniformly distributed along the circumferential direction of the central cylinder (1).
4. The pintle injector capable of realizing multidimensional impact atomization according to any one of claims 1 to 3, wherein: the injection groove (121) is U-shaped.
5. The pintle injector capable of achieving multidimensional impact atomization according to claim 4, wherein: a support frame (13) is arranged on the inner wall of the central cylinder (1), and a connecting rod (21) is arranged on the support frame (13) in a threaded connection mode in a penetrating mode.
6. An injection method for achieving multidimensional impact atomization, comprising:
uniformly injecting a first propellant downwards outside the circumference of a central barrel (1) of the needle-bolt injector;
a plurality of first liquid areas distributed on the bottom end circumference of a central barrel (1) of the needle-latch injector radially inject columnar second propellant, and a plurality of second liquid areas distributed on the bottom end circumference radially inject fan-shaped second propellant; the first liquid areas and the second liquid areas are distributed in a staggered mode along the circumferential direction; the flow rate of the second propellant in the second liquid zone is less than the flow rate of the second propellant in the first liquid zone;
the first propellant is respectively impacted and atomized with the cylindrical second propellant and the fan-shaped second propellant.
7. An injection method capable of achieving multidimensional impact atomization according to claim 6, wherein: the bottom end of a central barrel (1) of the needle-fastening injector is provided with a plurality of circumferentially distributed supporting teeth (11), and the supporting teeth (11) are positioned between the first liquid area and the second liquid area.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210478690.6A CN114576039B (en) | 2022-05-05 | 2022-05-05 | Pintle injector capable of realizing multidimensional impact atomization and injection method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210478690.6A CN114576039B (en) | 2022-05-05 | 2022-05-05 | Pintle injector capable of realizing multidimensional impact atomization and injection method |
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| CN114576039A true CN114576039A (en) | 2022-06-03 |
| CN114576039B CN114576039B (en) | 2022-08-12 |
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Citations (9)
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| US20060230745A1 (en) * | 2005-04-18 | 2006-10-19 | Japan Aerospace Exploration Agency | Pintle injector |
| CN104196651A (en) * | 2014-06-13 | 2014-12-10 | 中国航天科技集团公司第六研究院第十一研究所 | Adjustable coaxial double-slotting bolt type inspirator |
| CN104234870A (en) * | 2014-06-13 | 2014-12-24 | 中国航天科技集团公司第六研究院第十一研究所 | Slotted coaxial pintle type injector thrust chamber |
| US9255549B1 (en) * | 1997-07-21 | 2016-02-09 | William S. Brown | Laser ignition for liquid propellant rocket engine injectors |
| JP2017110600A (en) * | 2015-12-17 | 2017-06-22 | ダイハツ工業株式会社 | Injector |
| CN110469428A (en) * | 2019-07-31 | 2019-11-19 | 西安航天动力研究所 | Double atomization pintle ejector filler suitable for high-viscous liquid |
| CN110714856A (en) * | 2019-11-25 | 2020-01-21 | 北京航空航天大学 | Injector, rocket engine and rocket |
| CN212615069U (en) * | 2020-07-24 | 2021-02-26 | 西安未来空天引擎科技有限公司 | Internal shielding slot large-transformation-ratio needle bolt type injector engine |
| CN113006968A (en) * | 2021-03-02 | 2021-06-22 | 北京航空航天大学 | Mechanical positioning type self-adaptive pintle injector |
-
2022
- 2022-05-05 CN CN202210478690.6A patent/CN114576039B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9255549B1 (en) * | 1997-07-21 | 2016-02-09 | William S. Brown | Laser ignition for liquid propellant rocket engine injectors |
| US20060230745A1 (en) * | 2005-04-18 | 2006-10-19 | Japan Aerospace Exploration Agency | Pintle injector |
| CN104196651A (en) * | 2014-06-13 | 2014-12-10 | 中国航天科技集团公司第六研究院第十一研究所 | Adjustable coaxial double-slotting bolt type inspirator |
| CN104234870A (en) * | 2014-06-13 | 2014-12-24 | 中国航天科技集团公司第六研究院第十一研究所 | Slotted coaxial pintle type injector thrust chamber |
| JP2017110600A (en) * | 2015-12-17 | 2017-06-22 | ダイハツ工業株式会社 | Injector |
| CN110469428A (en) * | 2019-07-31 | 2019-11-19 | 西安航天动力研究所 | Double atomization pintle ejector filler suitable for high-viscous liquid |
| CN110714856A (en) * | 2019-11-25 | 2020-01-21 | 北京航空航天大学 | Injector, rocket engine and rocket |
| CN212615069U (en) * | 2020-07-24 | 2021-02-26 | 西安未来空天引擎科技有限公司 | Internal shielding slot large-transformation-ratio needle bolt type injector engine |
| CN113006968A (en) * | 2021-03-02 | 2021-06-22 | 北京航空航天大学 | Mechanical positioning type self-adaptive pintle injector |
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| CN114576039B (en) | 2022-08-12 |
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