CN110686574B - Microwave ignition test device - Google Patents
Microwave ignition test device Download PDFInfo
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- CN110686574B CN110686574B CN201910857702.4A CN201910857702A CN110686574B CN 110686574 B CN110686574 B CN 110686574B CN 201910857702 A CN201910857702 A CN 201910857702A CN 110686574 B CN110686574 B CN 110686574B
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- microwave
- conductors
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- truncated cone
- resonant cavity
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- 238000012360 testing method Methods 0.000 title claims abstract description 19
- 239000004020 conductor Substances 0.000 claims abstract description 93
- 238000000034 method Methods 0.000 abstract description 5
- 239000003721 gunpowder Substances 0.000 description 14
- 230000005540 biological transmission Effects 0.000 description 8
- 230000005684 electric field Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
- F42C21/00—Checking fuzes; Testing fuzes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
- H01J23/16—Circuit elements, having distributed capacitance and inductance, structurally associated with the tube and interacting with the discharge
- H01J23/18—Resonators
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Constitution Of High-Frequency Heating (AREA)
Abstract
Microwave ignition test device relates to the microwave technique. The microwave cavity comprises a magnetron, a circulator and a microwave resonant cavity, wherein the magnetron, the circulator and the microwave resonant cavity are sequentially connected; two pairs of inner conductors are arranged in a cavity of the microwave resonant cavity, wherein the first pair of inner conductors comprise two circular truncated cone conductors which have the same size and are opposite in top surface and coaxially arranged, and the bottom surfaces of the circular truncated cone conductors are fixedly arranged on two opposite inner walls of the microwave resonant cavity; the second pair of inner conductors comprises two truncated cone conductors which have the same size and are opposite in top surface and coaxially arranged, the bottom surfaces of the truncated cone conductors are fixedly arranged on two opposite inner walls of the microwave resonant cavity, and the top surface of one truncated cone inner conductor in the second pair of inner conductors is provided with a groove; the radius of the bottom surface of the circular truncated cone-shaped conductor in the first pair of inner conductors is larger than that of the bottom surface of the circular truncated cone-shaped conductor in the second pair of inner conductors. The invention has simple structure, easy realization, repeated test and no need of vacuum equipment.
Description
Technical Field
The invention relates to microwave technology.
Background
Microwave ignition and combustion-supporting technique are as a novel ignition mode, compare with traditional ignition and spread fire mode, have a great deal of advantage: the ignition delay time is greatly shortened; the ignition performance is good, and the filling density of gunpowder can be increased; the powder combustion improver has good temperature compensation effect and obvious enhancement effect on the combustion of powder; the ignition device has simple structure, does not need electrodes, is not only beneficial to generating high-purity plasma, but also can prolong the service life of the system.
The common way to verify ignition system performance and reliability is: a set of microwave ignition device is directly designed and applied to an artillery to carry out an artillery ignition test, carry out technical verification and reliability check, correct after problems are found, carry out the test again and carry out the cyclic reciprocating. The main problems of the method are as follows: the time spent, the manpower, the material resources and the financial resources are huge, the energy consumption is high, and the method is dangerous.
Disclosure of Invention
The invention aims to solve the technical problem of providing a microwave ignition test device which is simple in structure, safe and reliable.
The technical scheme adopted by the invention for solving the technical problems is that the microwave ignition test device is characterized by comprising a magnetron, a circulator and a microwave resonant cavity with a rectangular cross section, wherein the magnetron, the circulator and the microwave resonant cavity are sequentially connected; two pairs of inner conductors are arranged in the cavity of the microwave resonant cavity, wherein,
the first pair of inner conductors comprise two circular truncated cone conductors which have the same size and are opposite in top surface and coaxially arranged, and the bottom surfaces of the circular truncated cone conductors are fixedly arranged on two opposite inner walls of the microwave resonant cavity;
the second pair of inner conductors comprises two truncated cone conductors which have the same size and are opposite in top surface and coaxially arranged, the bottom surfaces of the truncated cone conductors are fixedly arranged on two opposite inner walls of the microwave resonant cavity, and the top surface of one truncated cone inner conductor in the second pair of inner conductors is provided with a groove;
the radius of the bottom surface of the circular truncated cone-shaped conductor in the first pair of inner conductors is larger than that of the bottom surface of the circular truncated cone-shaped conductor in the second pair of inner conductors.
In the invention, the radius of the top surface of the circular truncated cone is smaller than that of the bottom surface.
Further, the first pair of inner conductors and the second pair of inner conductors are disposed on the broad wall of the microwave cavity.
The axes of the first pair of inner conductors and the second pair of inner conductors intersect a broad-walled centerline of the microwave cavity, the broad-walled centerline being parallel to the axis of the microwave cavity.
The invention can realize the ignition of gunpowder under lower microwave power, measure the ignition threshold value of the gunpowder and obtain the microwave ignition characteristic of the gunpowder. The device satisfies the ignition test power demand, and simple structure, safe and reliable.
The invention has the following technical effects:
(1) through the optimized design of the breakdown discharge structure in the waveguide, the microwave field intensity required by gunpowder ignition can be realized by adopting a microwave source with lower power, and the field intensity is adjustable, so that the energy consumption is low, the cost is low, and the microwave radiation is small;
(2) the ignition device has a simple structure, is easy to realize, can repeatedly carry out tests, and does not need vacuum equipment;
(3) the device is used for carrying out gunpowder ignition test, the required gunpowder amount is very small (about 1 g), the operation is simple, and the device is safe and reliable;
(4) the open waveguide antenna is used as a microwave matching load, and the whole gunpowder ignition process can be shot by using a high-speed camera, so that the problem searching and the ignition characteristic analysis and research are facilitated.
Drawings
FIG. 1 is a schematic diagram of a microwave ignition testing apparatus applied to gunpowder characteristic research in an embodiment of the present invention;
fig. 2 is a schematic diagram of the internal structure of the microwave resonant cavity in the microwave ignition test device shown in fig. 1.
The labels in the figure are:
1-magnetron driving power supply, 2-magnetron, 3-microwave input port, 4-circulator, 5-transmission waveguide, 6-microwave resonant cavity, 7-high-speed camera, 8-inner conductor I, 9-inner conductor II, 10-inner conductor III and 11-inner conductor IV
Detailed Description
Referring to fig. 1, the testing system of the present invention includes a microwave power unit, a microwave transmission system and a microwave resonant cavity, and the working principle is as follows: the microwave power unit generates microwave pulses with specific frequency and specific power, the generated microwaves are transmitted through a microwave transmission system, enter the microwave resonant cavity and resonate, and a strong electric field is generated at the tail ends (tops) of a second pair of inner conductors (small round tables) in the device. The field intensity at the tail end of the small circular table can be changed by adjusting the injection power, the gunpowder placed at the tail end of the small circular table is punctured by the strong field to generate plasma, the gunpowder is ignited, and then the gunpowder is rapidly and completely combusted under the interaction of the microwave and the plasma.
The microwave power unit comprises a magnetron driving power supply and a magnetron, and the magnetron generates microwave pulses with specific frequency and specific power and outputs the microwave pulses to a microwave transmission system;
the microwave transmission system comprises a circulator, a transmission waveguide and the like, and is used for separating incident microwaves generated by the magnetron from microwaves reflected by the system and transmitting the microwaves to the microwave resonant cavity;
the microwave resonant cavity is internally in an asymmetric structure and consists of a pair of round tables (a first pair of inner conductors) with larger size and a pair of round tables (a second pair of inner conductors) with smaller size, the two pairs of inner conductors have the optimal combination size and the optimal relative position, so that the resonant frequency of the cavity is the designated frequency, a strong electric field is generated at the tail ends of the second pair of inner conductors, and the field intensity generated at the tail ends of the first pair of inner conductors is about one tenth of the field intensity at the tail ends of the second pair of inner conductors. Through input power size control, can realize electric field strength variation in a large scale, realize different gunpowder ignition test demands.
Example (applicable to S band):
as shown in fig. 1, the microwave ignition test device mainly comprises a microwave power unit, a microwave transmission system and a microwave resonant cavity. The microwave power unit comprises a magnetron driving power supply 1 and a magnetron 2, wherein the frequency of the magnetron is 2.45GHz, the power of the magnetron is 1kW, the magnetron is used for converting direct current energy obtained in a direct current electric field into microwave energy to the maximum extent, the microwave energy is output to a circulator 4 through a microwave input port 3, incident microwaves generated by the magnetron are separated from reflected microwaves reflected by a system, and finally the microwaves are transmitted to a microwave resonant cavity 6 through a transmission waveguide 5.
Fig. 2 is a schematic structural view of the microwave cavity 6. The microwave resonant cavity comprises an outer conductor and an inner conductor, wherein the inner contour and the outer contour of the outer conductor are formed in a closed mode; the outer contour of the outer conductor is consistent with that of a standard BJ26 waveguide, and the outer conductor is provided with a standard flange plate which can be connected with a microwave transmission system; the inner profile of the outer conductor conforms to a standard BJ26 waveguide;
the inner conductor comprises a first inner conductor 8, a second inner conductor 9, a third inner conductor 10 and a fourth inner conductor 11; the first inner conductor 8 and the second inner conductor 9 are the same in size (the radius of the bottom surface is 29mm, the radius of the top surface is 1mm, and the height is 18.59mm) to form a first pair of inner conductors; the third inner conductor 10 and the fourth inner conductor 11 have the same size (the radius of the bottom surface is 6mm, the radius of the top surface is 1mm, and the height is 21.09mm) to form a second pair of inner conductors, and each inner conductor is in a circular truncated cone shape; the top of the cone of the first inner conductor 8, the top of the cone of the second inner conductor 9 and the top of the cone of the third inner conductor 10 are planes, and the top of the cone of the fourth inner conductor 11 is provided with a groove; the first inner conductor 8 and the second inner conductor 9 are coaxial, and the third inner conductor 10 and the fourth inner conductor 11 are coaxial; the bottoms of the first inner conductor 8, the second inner conductor 9, the third inner conductor 10 and the fourth inner conductor 11 are directly connected with the outer conductor, and in the figure 2, the inner conductor is fixed on the wide wall of the microwave resonant cavity by adopting a thread structure.
The first and second pairs of inner conductors are both disposed at the broad walls of the microwave cavity 6. The axes of the first and second pairs of inner conductors both intersect the broad-walled centre line of the microwave cavity 6, said broad-walled centre line being parallel to the axis of the microwave cavity 6. The distance between the axes of the two pairs of conductors is 112.5 mm.
By the design of the internal structure of the microwave resonant cavity, gunpowder at the top of the four 11 inner conductors can be ignited under atmospheric pressure without any igniter; in addition, the loss of the microwave is low, so that the required microwave power can be greatly reduced, and the conversion efficiency is improved.
The electromagnetic simulation software is utilized for designing, when the input power is 1kW, the electric field intensity at the tail end of the small circular table is about 1.5 x 106V/m, the electric field strength can fully realize ignition breakdown.
Claims (3)
1. The microwave ignition test device is characterized by comprising a magnetron (2), a circulator (4) and a microwave resonant cavity (6) with a rectangular cross section, wherein the magnetron (2), the circulator and the microwave resonant cavity are sequentially connected; two pairs of inner conductors are arranged in the cavity of the microwave resonant cavity (6), wherein,
the first pair of inner conductors comprises two truncated cone conductors which have the same size, are opposite in top surface and are coaxially arranged, and the bottom surfaces of the truncated cone conductors are fixedly arranged on two opposite inner walls of the microwave resonant cavity (6);
the second pair of inner conductors comprises two truncated cone conductors which have the same size and are opposite in top surface and coaxially arranged, the bottom surfaces of the truncated cone conductors are fixedly arranged on two opposite inner walls of the microwave resonant cavity (6), and the top surface of one truncated cone inner conductor in the second pair of inner conductors is provided with a groove;
the radius of the bottom surface of the circular truncated cone-shaped conductor in the first pair of inner conductors is larger than that of the bottom surface of the circular truncated cone-shaped conductor in the second pair of inner conductors.
2. A microwave ignition test apparatus according to claim 1, characterized in that the first pair of inner conductors and the second pair of inner conductors are arranged on the broad walls of the microwave cavity (6).
3. A microwave ignition test apparatus according to claim 1 characterised in that the axes of the first and second pairs of inner conductors intersect the centre line of the broad walls of the microwave cavity (6), said centre line of the broad walls being parallel to the axis of the microwave cavity (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910857702.4A CN110686574B (en) | 2019-09-09 | 2019-09-09 | Microwave ignition test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910857702.4A CN110686574B (en) | 2019-09-09 | 2019-09-09 | Microwave ignition test device |
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| Publication Number | Publication Date |
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| CN110686574A CN110686574A (en) | 2020-01-14 |
| CN110686574B true CN110686574B (en) | 2021-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910857702.4A Expired - Fee Related CN110686574B (en) | 2019-09-09 | 2019-09-09 | Microwave ignition test device |
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| CN114136095A (en) * | 2021-11-25 | 2022-03-04 | 昆明理工大学 | Microwave ignition device of sintering machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5929567A (en) * | 1997-01-31 | 1999-07-27 | The United States Of America As Represented By The United States Department Of Energy | Constant field gradient planar coupled cavity structure |
| FR2841379B1 (en) * | 2002-06-25 | 2005-07-15 | Commissariat Energie Atomique | MICROWAVE TUBE WITH MECHANICAL ACCELERATION OF FREQUENCY |
| CN102789939A (en) * | 2012-06-19 | 2012-11-21 | 电子科技大学 | Energy output structure of panel vacuum electron device |
| CN209055461U (en) * | 2018-05-30 | 2019-07-02 | 吉林大学 | A kind of microwave coupling plasma exciatiaon light source |
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