CN115241738A

CN115241738A - Gravity type high-voltage pulse discharge switch for coaxial cylindrical surface detonation driving device

Info

Publication number: CN115241738A
Application number: CN202210908591.7A
Authority: CN
Inventors: 陆星宇; 李进平; 张晓源; 张仕忠; 王苏; 陈宏�
Original assignee: Institute of Mechanics of CAS
Current assignee: Institute of Mechanics of CAS
Priority date: 2022-07-29
Filing date: 2022-07-29
Publication date: 2022-10-25
Anticipated expiration: 2042-07-29
Also published as: CN115241738B

Abstract

The invention discloses a gravity type high-voltage pulse discharge switch for a coaxial cylindrical surface detonation driving device, which comprises an insulating cylinder, an insulating slide block, a first power supply positive terminal, a second power supply positive terminal, an ignition filament terminal and a power supply negative terminal; an insulating slide block is arranged in the insulating cylinder, and a conductive terminal is arranged on the insulating slide block; the first power supply positive terminal and the power supply negative terminal are both provided with first sliding contacts which are in contact with the conductive terminals; the second power supply positive terminal and the ignition filament terminal are both provided with second sliding contacts which are in contact with the conductive terminals; the first power supply positive terminal and the second power supply positive terminal are connected in parallel, and the first power supply positive terminal, the second power supply positive terminal and the power supply negative terminal are respectively and electrically connected with the high-voltage capacitor. The invention can ensure the time precision of millisecond level and realize the accurate control of the electrifying time.

Description

Gravity type high-voltage pulse discharge switch for coaxial cylindrical surface detonation driving device

Technical Field

The invention relates to the technical field of experimental research of high-temperature high-speed gas dynamics, high-speed aircrafts and the like, in particular to a gravity type high-voltage pulse discharge switch for a coaxial cylindrical detonation driving device.

Background

The shock tube/wind tunnel is experimental equipment widely used in the fields of high-temperature high-speed gas dynamics, high-speed aircrafts and the like, and the basic principle is as follows: the high pressure driving gas compresses the low pressure test gas through the shock wave to make it reach the required test state. As shown in fig. 1, a typical shock tube/wind tunnel includes a driving section 1', a driven section 2', a nozzle 3 'and a test section 4'; before testing, the driving section 1' and the driven section 2' are separated by a diaphragm 5', high-pressure driving gas is filled into the driving section 1', and low-pressure test gas is filled into the driven section 2 '; during the test, the membrane 5' is broken, and the high-pressure gas expands and enters the driven section 2', and simultaneously a shock wave with rapid motion is generated in the driven section 2 '; if the test is carried out by directly adopting gas after the shock wave, the equipment runs in a shock wave tube mode; if the test is carried out using the test gas accelerated by the nozzle 3', the device is operated in a shock tunnel mode.

The total temperature and total pressure range of the test gas are main indexes for measuring the equipment capacity, and the total temperature and total pressure range are determined by the driving capacity of the high-pressure driving gas. The normal-temperature high-pressure gas cannot meet increasingly harsh test requirements, so three high-performance driving technologies have been developed at home and abroad: piston drive, heated light gas drive, and detonation drive. The detonation driving technology has the characteristics of low cost, simple structure, safety and the like, and is the current domestic mainstream technology.

Detonation-driven shock tubes were first proposed by Bird in 1957. Mr. Shu hong Ju, the institute of mechanics of the Chinese academy of sciences, constructed a detonation-driven shock tube 13.3m long in 1981, and was put into use in 1983. The mechanical research institute of chinese academy of sciences developed JF-10 detonation-driven high enthalpy shock tunnels in 1994 [ see properties-aerodynamic test and measurement control of oxyhydrogen detonation-driven shock tunnels of shu hong ju, zhao wei, and yuan sheng, 1993,7 (3): 38-42). Gronig et al, 1993 with the help of Mr. Shu hong, built a high enthalpy shock tunnel (TH 2-D) using reverse detonation drive at the Geam industry university in Germany. In 1994, NASA modified the original free piston drive design, building a forward detonation-driven high enthalpy Shock tunnel (HYPULSE) at the GASL build that can operate in both the Reflected Shock tunnel Mode and the Expansion tube Mode [ see due RSM, tsai C-Y, bakos RJ, erdos JI, rogers RC (2002) NASA's HYPULSE Facility at GASL-advanced Mode, dual Driver Reflected-Shock/Expansion tunnel. In: lu F, marren D (eds), advanced Hypersonic Test Facilities, progress in Astronacutics and Aeronoutics, vol.198, AIAA, chapter 3, pp29-71 ].

Detonation drive needs to form detonation waves propagating along the axial direction in a drive section, and the following problems exist in the drive technology due to the uneven flow field after the detonation waves: firstly, the range of the mixing proportion of the detonable gas is much narrower than that of the detonable gas, and the temperature and sound velocity range of the driving gas are correspondingly narrower, so that the total temperature range of the test gas which can be provided by detonation driving is limited; second, the effective drive pressure provided by detonation drive does not exceed 40% of the pressure-bearing limit of the apparatus, limiting the total pressure range of the test gas.

The detonation drive has the problems, the problems need to be overcome, and a coaxial cylindrical detonation drive technology needs to be introduced, but the coaxial cylindrical detonation drive technology needs to plug high-voltage electrodes at two ends of a drive section respectively, an ignition wire along the axial center line direction of the drive section is arranged between the two high-voltage electrodes, and a discharge system is used for supplying power to the ignition wire, wherein a required high-voltage pulse power supply takes a high-voltage capacitor as an energy storage element, the time required by the complete release of charges in the high-voltage capacitor is longer than the combustion duration (10 ms magnitude), and a combustion product contains a large amount of ions and water, so that the breakdown is easy to occur. In order to ensure the safety of equipment and personnel, the duration of the power-on needs to be controlled in millisecond order, and good repeatability is needed; ordinary mechanical relays are difficult to meet, while solid state relays based on semiconductor technology are expensive and easily damaged.

Prior document 1 (CN 201911027930.5) discloses a downhole operation pulse discharge switch structure, which includes a fixed electrode portion, an adjustable electrode portion, an insulating layer; the fixed electrode part comprises an upper wiring terminal, a fixed electrode and an inner hexagonal set screw. The adjustable electrode part comprises a lower wiring terminal, an adjustable electrode, a fixing nut, a set screw and a set nut. The insulating layer includes an upper end insulating layer, a middle insulating layer, and a lower end insulating layer, but this scheme still does not satisfy the above-mentioned needs.

Prior document 2 (CN 102407947A) discloses a shock tunnel detonation double-drive device, including: the shock tunnel is provided with a detonation driving section, one end of the detonation driving section is provided with an explosion unloading section, and the other end of the detonation driving section is provided with a driven section; a first diaphragm is arranged between the detonation discharge section and the detonation driving section, and a second diaphragm is arranged between the driven section and the detonation driving section; a positive detonation driving ignition device is arranged at one section of the detonation driving section, which is close to the detonation unloading section, and a negative detonation driving ignition device is arranged at one section of the detonation driving section, which is close to the driven section; a controllable delay trigger device is connected between the positive detonation drive ignition device and the reverse detonation drive ignition device, and the method comprises the following steps: 1) A positive detonation ignition device is arranged at one end of the shock tunnel detonation driving section close to the detonation discharge section, and a reverse detonation driving ignition device is arranged at one end of the detonation driving section close to the driven section; 2) Igniting through a positive detonation ignition device to form a positive driving detonation wave; 3) After the forward detonation wave is propagated for a preset time along the detonation driving section, the ignition device is driven by the reverse detonation to ignite, and a reverse driving detonation wave is formed; 4) The diaphragm arranged between the driven section and the detonation driving section is torn by the reverse driving detonation wave, the forward detonation wave and the reverse detonation wave are intersected to form a motion shock wave, and the motion shock wave enters the driven section to compress the test gas of the driven section.

In order to meet the coaxial cylindrical detonation driving technology, the invention provides a gravity type high-voltage pulse discharge switch for a coaxial cylindrical detonation driving device, and the gravity type high-voltage pulse discharge switch for the coaxial cylindrical detonation driving device is not easy to think by a person skilled in the art.

Disclosure of Invention

In view of this, the invention provides a gravity type high-voltage pulse discharge switch for a coaxial cylindrical surface detonation driving device, which comprises an insulating cylinder, an insulating slide block, a first power supply positive terminal, a second power supply positive terminal, an ignition filament terminal and a power supply negative terminal;

a buffer cushion is arranged at the bottom end in the insulating cylinder;

an insulating slide block is arranged in the insulating cylinder, and a conductive terminal is arranged on one side, close to the buffer pad, of the insulating slide block;

the first power supply positive terminal and the power supply negative terminal are respectively arranged on one side, close to the buffer pad, of the insulating cylinder, and correspond to each other;

the second power supply positive terminal is arranged on one side, away from the buffering cushion, of the insulating cylinder, close to the first power supply positive terminal, and the ignition wire terminal is arranged on one side, away from the buffering cushion, of the insulating cylinder, close to the power supply negative terminal, wherein the second power supply positive terminal corresponds to the ignition wire terminal;

the first power supply positive terminal and the power supply negative terminal are both provided with first sliding contacts which are in contact with the conductive terminals, and the first sliding contacts of the first power supply positive terminal are electrically connected with the first sliding contacts of the power supply negative terminal through the conductive terminals;

the second power supply positive terminal and the ignition filament terminal are both provided with second sliding contacts which are in contact with the conductive terminals, and the second sliding contacts of the second power supply positive terminal are electrically connected with the second sliding contacts of the ignition filament terminal through the conductive terminals;

the first power supply positive terminal and the second power supply positive terminal are connected in parallel, and the first power supply positive terminal, the second power supply positive terminal and the power supply negative terminal are respectively and electrically connected with a high-voltage capacitor;

the insulating cylinder and the insulating slide block are respectively in a cylinder shape, and the section of the cylinder along the first direction is circular or square;

the length of the insulating slide block along a first direction is greater than the diameter of the insulating slide block, and the first direction is a direction from the insulating slide block to the buffer pad;

the height of the conductive terminal along the first direction is d1, the length between the first sliding contact and the second sliding contact along the first direction is d2, the length between the first sliding contact and the buffer pad along the first direction is d3, wherein d2 is greater than d1 and greater than d3.

Optionally, the first sliding contact includes a first sub-sliding contact connected to the first power supply positive terminal and a second sub-sliding contact connected to the power supply negative terminal;

the first sub sliding contact comprises a first contact section and a first contact section connected with the first contact section, the first contact section is positioned on one side, close to a first power supply positive terminal, of the first sub sliding contact, the first contact section is positioned on one side, far away from the first power supply positive terminal, of the first sub sliding contact, the included angle between the first contact section and the first contact section is theta 1, and 180 degrees is larger than theta 1 and larger than 90 degrees;

the second sub sliding contact comprises a second contact section and a second contact section connected with the second contact section, the second contact section is positioned on one side, close to the power supply negative terminal, of the second sub sliding contact, the second contact section is positioned on one side, far away from the power supply negative terminal, of the second sub sliding contact, the included angle between the second contact section and the second contact section is theta 2, and 180 degrees and theta 2 are larger than 90 degrees;

where θ 1= θ 2.

Optionally, the length between the first contact segment and the second contact segment along a second direction is slightly smaller than the diameter of the conductive terminal, wherein the slightly smaller range is 0.5 to 1cm, and the second direction is intersected with the first direction.

Optionally, the second sliding contact includes a third sub-sliding contact connected to the second power supply positive terminal and a fourth sub-sliding contact connected to the ignition wire terminal;

the third sub sliding contact comprises a third contact section and a third contact section connected with the third contact section, the third contact section is positioned on one side, close to the second power supply positive terminal, of the third sub sliding contact, the third contact section is positioned on one side, far away from the second power supply positive terminal, of the third sub sliding contact, the included angle between the third contact section and the third contact section is theta 3, and 180 degrees is larger than theta 3 and larger than 90 degrees;

the fourth sub sliding contact comprises a fourth contact section and a fourth contact section connected with the fourth contact section, the fourth contact section is positioned on one side, close to the ignition filament wiring terminal, of the fourth sub sliding contact, the fourth contact section is positioned on one side, far away from the ignition filament wiring terminal, of the fourth sub sliding contact, the included angle between the fourth contact section and the fourth contact section is theta 4, and the included angle is more than 180 degrees and more than theta 4 and more than 90 degrees; where θ 3= θ 4.

Optionally, the length between the first contact section and the second contact section along the second direction is slightly smaller than the diameter of the conductive terminal; the length between the third contact section and the fourth contact section along the second direction is slightly smaller than the diameter of the conductive terminal, wherein the range of slightly smaller is 0.5-1cm, and the second direction is intersected with the first direction.

Optionally, the length of the insulating slider along the first direction is 5-10cm, and the diameter of the insulating slider is 3-4cm.

Alternatively, d1=2-3cm, d2=4-5cm, d3=1-2cm.

Optionally, the cushion pad is a foam pad, a rubber pad, or an inflatable pad.

Optionally, the insulating slider is made of plastic, rubber or wood.

Compared with the prior art, the gravity type high-voltage pulse discharge switch for the coaxial cylindrical surface detonation driving device provided by the invention at least realizes the following beneficial effects:

firstly, the ignition wire is powered by connecting a high-voltage capacitor positive electrode, a second power supply positive electrode binding post, a second sliding contact, a conductive terminal and the ignition wire electrode binding post in series, the millisecond-level time precision can be ensured, the accurate control of the electrifying time is realized, and the residual charges in the high-voltage capacitor are directly neutralized by connecting the high-voltage capacitor positive electrode, the first power supply positive electrode binding post, the first sliding contact, the conductive terminal, the power supply negative electrode binding post and the high-voltage capacitor negative electrode in series and connecting the first power supply positive electrode binding post and the second power supply positive electrode binding post in parallel, so that the safety of equipment and personnel is ensured;

secondly, the conductive terminals are prevented from rebounding to cause the second sliding contact to be conducted again through the buffer cushion, and accidental breakdown is avoided;

thirdly, the insulation cylinder is matched with the insulation slide block, so that the high voltage of tens of thousands of volts can be borne, and the structure is strong, safe and reliable;

fourth, the materials and processes used are cheaper and the cost is much lower than that of solid state relays of the same voltage and current class.

Of course, it is not necessary for any product in which the present invention is practiced to achieve all of the above-described technical effects simultaneously.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

FIG. 1 is a schematic diagram of a shock tube/wind tunnel configuration provided in the prior art;

fig. 2 is a schematic structural diagram of a gravity type high-voltage pulse discharge switch for a coaxial cylindrical detonation driving device according to an embodiment of the present invention;

FIG. 3 is an enlarged view at A in FIG. 2;

fig. 4 is a schematic structural diagram of a coaxial cylindrical deflagration driving device for a shock tube/wind tunnel according to an embodiment of the present invention;

FIG. 5 is an enlarged view of the structure at B in FIG. 4;

fig. 6 is a schematic structural diagram of a shock tube/wind tunnel according to an embodiment of the present invention;

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be discussed further in subsequent figures.

FIG. 2 is a schematic structural diagram of a gravity type high-voltage pulse discharge switch for a coaxial cylindrical detonation driving device according to an embodiment of the invention; FIG. 3 is an enlarged view at A in FIG. 2; referring to fig. 2 and 3, the present embodiment provides a gravity type high voltage pulse discharge switch 1000 for a coaxial cylindrical detonation driving device, including an insulating cylinder 100, an insulating slider 200, a first power supply positive terminal 300, a second power supply positive terminal 400, an ignition filament terminal 500, and a power supply negative terminal 600;

a buffer pad 101 is arranged at the bottom end in the insulating cylinder 100;

an insulating slide block 200 is arranged in the insulating cylinder 100, and a conductive terminal 201 is arranged on one side, close to the buffer pad 101, of the insulating slide block 200;

the first power supply positive terminal 300 and the power supply negative terminal 600 are respectively arranged on one side, close to the cushion pad 101, of the insulating cylinder 100, and the first power supply positive terminal 300 corresponds to the power supply negative terminal 600;

the second power supply positive terminal 400 is arranged on one side, close to the first power supply positive terminal 300, away from the cushion pad 101, of the insulating cylinder 100, and the ignition filament terminal 500 is arranged on one side, close to the power supply negative terminal 600, away from the cushion pad 101, of the insulating cylinder 100, wherein the second power supply positive terminal 400 corresponds to the ignition filament terminal 500;

the first power supply positive terminal 300 and the power supply negative terminal 600 are both provided with a first sliding contact 301 which is in contact with the conductive terminal 201, and the first sliding contact 301 of the first power supply positive terminal 300 is electrically connected with the first sliding contact 301 of the power supply negative terminal 600 through the conductive terminal 201;

the second power supply positive terminal 400 and the ignition filament terminal 500 are both provided with a second sliding contact 401 which is in contact with the conductive terminal 201, and the second sliding contact 401 of the second power supply positive terminal 400 is electrically connected with the second sliding contact 401 of the ignition filament terminal 500 through the conductive terminal 201;

the first power supply positive terminal 300 and the second power supply positive terminal 400 are connected in parallel and are connected to the positive electrode of the high-voltage capacitor 71 together; the power supply negative terminal 600 is connected with the negative electrode of the high-voltage capacitor 71;

the insulating cylinder 100 and the insulating slider 200 are respectively in the shape of a cylinder, and the section of the cylinder along the first direction can be circular or square;

the length of the insulating slider 200 in a first direction E, which is a direction from the insulating slider 200 to the cushion pad 101, is greater than the diameter of the insulating slider 200;

the length of the conductive terminal 201 along the first direction E is d1, the length between the first sliding contact 301 and the second sliding contact 401 along the first direction E is d2, and the length between the first sliding contact 301 and the cushion pad 101 along the first direction E is d3, where d2 > d1 > d3.

Specifically, the gravity type high-voltage pulse discharge switch 1000 for the coaxial cylindrical surface detonation driving device comprises an insulating cylinder 100, an insulating slider 200, a first power supply positive terminal 300, a second power supply positive terminal 400, an ignition filament terminal 500 and a power supply negative terminal 600, wherein the insulating cylinder 100 can be vertically placed or the insulating cylinder 100 can be obliquely placed when the switch is used;

in order to ensure that the conducting time of the positive electrode and the negative electrode of the first power supply positive terminal 300 and the power supply negative terminal 600 is long enough, the bottom end of the insulating cylinder 100 is provided with a buffer pad 101, the buffer pad 101 is positioned in the insulating cylinder 100, and the buffer pad 101 can be a foam pad, a rubber pad or an inflatable pad;

an insulating slide block 200 is arranged in the insulating cylinder 100, the insulating slide block 200 can slide the insulating slide block 200 from the top and fall in the insulating cylinder 100 at an accelerated speed under the action of gravity, a conductive terminal 201 is arranged on one side, close to the buffer pad 101, of the insulating slide block 200, the conductive terminal 201 can be a section of metal column, and the insulating slide block 200 is made of plastics, rubber or wood;

the first power positive terminal 300 and the power negative terminal 600 are respectively installed at one side of the insulating cylinder 100 close to the cushion pad 101, that is, the first power positive terminal 300 and the power negative terminal 600 are located at the bottom of the insulating cylinder 100, wherein the first power positive terminal 300 corresponds to the power negative terminal 600;

the second power supply positive terminal 400 is mounted on the side of the insulating cylinder 100 close to the first power supply positive terminal 300 and far from the cushion pad 101, and the ignition wire terminal 500 is mounted on the side of the insulating cylinder 100 close to the power supply negative terminal 600 and far from the cushion pad 101, wherein the second power supply positive terminal 400 corresponds to the ignition wire terminal 500, that is, the second power supply positive terminal 400 and the ignition wire terminal 500 are also positioned at the bottom of the insulating cylinder 100;

a first sliding contact 301 that is in contact with a conductive terminal 201 is provided on each of the first power positive terminal 300 and the power negative terminal 600, and the first sliding contact 301 of the first power positive terminal 300 is electrically connected to the first sliding contact 301 of the power negative terminal 600 through the conductive terminal 201, that is to say: the first sliding contact 301 of the first power positive terminal 300, the conductive terminal 201 and the first sliding contact 301 of the power negative terminal 600 are connected in series;

a second sliding contact 401 that is in contact with the conductive terminal 201 is provided at each of the second power source positive terminal 400 and the ignition wire terminal 500, and the second sliding contact 401 of the second power source positive terminal 400 is electrically connected to the second sliding contact 401 of the ignition wire terminal 500 through the conductive terminal 201, that is to say: the second sliding contact 401 of the second power supply positive terminal 400, the conductive terminal 201 and the second sliding contact 401 of the ignition filament terminal 500 are connected in series;

the first power supply positive terminal 300 and the second power supply positive terminal 400 are connected in parallel, and when the ignition switch is used in detail, the first power supply positive terminal 300 and the second power supply positive terminal 400 are electrically connected with the positive electrode of the high-voltage capacitor 71, the ignition wire terminal 500 is electrically connected with the positive electrode of the ignition wire 13, the power supply negative terminal 600 is electrically connected with the negative electrode of the high-voltage capacitor 71, and the high-voltage capacitor 71 is used for storing high-voltage electricity and discharging electricity to the ignition wire;

the insulating cylinder 100 and the insulating slider 200 are respectively in the shape of a cylinder, the cross section of the cylinder along the first direction can be circular or square, and the cross section of the cylinder can also be in other shapes, in this example, the insulating cylinder 100 and the insulating slider 200 are both cylinders;

in order to prevent the conductive terminal 201 from turning over during falling, the length of the insulating slider 200 along a first direction E is greater than the diameter of the insulating slider 200, the first direction E is a direction from the insulating slider 200 to the cushion pad 101, for example, the length of the insulating slider 200 along the first direction E may be 5-10cm, and the diameter of the insulating slider 200 may be 3-4cm;

the height of the conductive terminal 201 along the first direction E is d1, the length between the first sliding contact 301 and the second sliding contact 401 along the first direction E is d2, and the length between the first sliding contact 301 and the buffer pad 101 along the first direction E is d3, where d2 > d1 > d3, that is, the distance between the first sliding contact 301 and the second sliding contact 401 is the largest, and the distance between the first sliding contact 301 and the buffer pad 101 along the first direction E is slightly smaller than the height d1 of the conductive terminal 201, such as d1=2-3cm, d2=4-5cm, d3=1-2cm, specifically, such as d1=3, d2=5, d3=2, or, d1=2, d2=5, d3=1, the values of d1, d2, and d3 can be adjusted according to the actual conditions, so that the conductive terminal 201 directly stays on the first sliding contact 301 of the negative terminal of the power supply and the positive terminal 300 of the first sliding power supply stays on the positive terminal of the negative terminal 600 with almost no bounce, and the positive terminal 300 is long enough to conduct electricity.

When in specific use, the insulating cylinder 100 can be vertically placed or obliquely placed; firstly, a first power supply positive terminal 300 and a second power supply positive terminal 400 are respectively electrically connected with the positive electrode of a high-voltage capacitor 71, an ignition wire terminal 500 is electrically connected with the positive electrode of an ignition wire 13, and a power supply negative terminal 600 is electrically connected with the negative electrode of the high-voltage capacitor 71; throwing the insulating slide block 200 from the top, and allowing the insulating slide block 200 to fall under the action of gravity at an accelerated speed; when the conductive terminal 201 is contacted with the second power supply positive terminal 400 and the second sliding contact 401 on the ignition wire terminal 500, the positive electrode of the high-voltage capacitor is conducted with the positive electrode of the ignition wire 13, and the power supply supplies power to the ignition wire 13; as the conductive terminal 201 continues to fall, the conductive terminal 201 disengages from the second sliding contact 401, and the power supply to the ignition wire 13 is stopped; later, the conductive terminal 201 is in contact with the first sliding contact 301 on the first power supply positive terminal 300 and the power supply negative terminal 600, the positive electrode and the negative electrode of the power supply are communicated, the residual charge in the capacitor is directly neutralized, and the bottom of the insulating cylinder 100 is provided with the buffer pad 101, so that the conductive terminal 201 directly stays on the first sliding contact 301 under the condition of almost no rebound, and the time for conducting the positive electrode and the negative electrode of the first power supply positive terminal 300 and the power supply negative terminal 600 is long enough; if the insulating cylinder 100 is placed in an inclined manner, the duration of the power supply to the ignition wire 13 is precisely adjusted by adjusting the inclination angle.

firstly, the ignition wire is powered by serially connecting the positive electrode of the high-voltage capacitor 71, the positive terminal 400 of the second power supply, the second sliding contact 401, the conductive terminal 201 and the terminal 500 of the ignition wire, the millisecond-level time precision can be ensured, and the accurate control of the electrifying time is realized, and the residual charge in the high-voltage capacitor 71 is directly neutralized by serially connecting the positive electrode of the high-voltage capacitor 71, the positive terminal 300 of the first power supply, the first sliding contact 301, the conductive terminal 201, the negative terminal 600 of the power supply and the negative electrode of the high-voltage capacitor, and simultaneously, the positive terminal 300 of the first power supply and the positive terminal 400 of the second power supply in parallel connection, so that the safety of equipment and personnel is ensured;

secondly, the cushion pad 101 prevents the conductive terminal 201 from rebounding to cause the second sliding contact 401 to be conducted again, so as to avoid accidental breakdown;

thirdly, the insulation cylinder 100 is matched with the insulation slide block, so that the high voltage of tens of thousands of volts can be borne, and the structure is strong, safe and reliable;

In an alternative embodiment of the present invention, the first sliding contact 301 comprises a first sub-sliding contact 302 connected to the first power positive terminal 300 and a second sub-sliding contact 303 connected to the power negative terminal 600;

the first sub-sliding contact 302 comprises a first contact section 304 and a first contact section 305 connected with the first contact section 304, the first contact section 304 is positioned on one side of the first sub-sliding contact 302 close to the first power supply positive terminal 300, the first contact section 305 is positioned on one side of the first sub-sliding contact 302 far away from the first power supply positive terminal 300, the included angle between the first contact section 304 and the first contact section 305 is theta 1, and 180 degrees > theta 1 > 90 degrees;

the second sub sliding contact 303 comprises a second contact section 306 and a second contact section 307 connected with the second contact section 306, the second contact section 306 is positioned on one side, close to the power supply negative terminal 600, of the second sub sliding contact 303, the second contact section 307 is positioned on one side, far away from the power supply negative terminal 600, of the second sub sliding contact 303, the included angle between the second contact section 306 and the second contact section 307 is theta 2, and 180 degrees is greater than theta 2 and greater than 90 degrees;

where θ 1= θ 2.

Specifically, the first sliding contact 301 includes a first sub-sliding contact 302 and a second sub-sliding contact 303, the first sub-sliding contact 302 is connected with the first power supply positive terminal 300, and the second sub-sliding contact 303 is connected with the power supply negative terminal 600;

the first sub sliding contact 302 comprises a first contact section 304 and a first contact section 305, the first contact section 305 is connected with the first contact section 304, the first contact section 304 is positioned on one side of the first sub sliding contact 302 close to the first power supply positive terminal 300, the first contact section 305 is positioned on one side of the first sub sliding contact 302 far away from the first power supply positive terminal 300, the included angle between the first contact section 304 and the first contact section 305 is theta 1, 180 degrees is larger than theta 1 and larger than 90 degrees, namely, the first contact section 305 is in direct contact with the conductive terminal 201, the first contact section 304 and the first contact section 305 are obtuse angles, the first contact section 305 is inclined downwards, and the included angle theta 1 faces towards the cushion pad 101;

the second sub sliding contact 303 comprises a second contact section 306 and a second contact section 307, the second contact section 306 is connected with the second contact section 307, the second contact section 306 is positioned on one side, close to the power supply negative terminal 600, of the second sub sliding contact 303, the second contact section 307 is positioned on one side, far away from the power supply negative terminal 600, of the second sub sliding contact 303, the included angle between the second contact section 306 and the second contact section 307 is theta 1, and 180 degrees is larger than theta 2 and larger than 90 degrees; that is to say: the second contact section 307 is in direct contact with the conductive terminal 201, an obtuse angle is formed between the second contact section 306 and the second contact section 307, the second contact section 307 is inclined downwards, the included angle theta 2 faces the buffer pad 101, and the first contact section 305 and the second contact section 307 are arranged in a mirror symmetry mode; wherein, θ 1= θ 2, by adopting the scheme, the insulating slider 200 with the conductive terminal 201 can smoothly slide.

In an alternative embodiment of the present invention, the second sliding contact 401 comprises a third sub-sliding contact 402 connected to the second power positive terminal 400 and a fourth sub-sliding contact 403 connected to the ignition wire terminal 500;

the third sub-sliding contact 402 comprises a third contact section 404 and a third contact section 405 connected with the third contact section 404, the third contact section 404 is positioned on one side of the third sub-sliding contact 402 close to the second power supply positive terminal 400, the third contact section 405 is positioned on one side of the third sub-sliding contact 402 far away from the second power supply positive terminal 400, the included angle between the third contact section 404 and the third contact section 405 is theta 3, and 180 degrees is larger than theta 3 and larger than 90 degrees;

the fourth sub sliding contact 403 comprises a fourth contact section 406 and a fourth contact section 407 connected with the fourth contact section 406, the fourth contact section 406 is positioned on one side of the fourth sub sliding contact 403 close to the ignition filament terminal 500, the fourth contact section 407 is positioned on one side of the fourth sub sliding contact 403 far away from the ignition filament terminal 500, the included angle between the fourth contact section 406 and the fourth contact section 407 is theta 4, and 180 degrees is greater than theta 4 and greater than 90 degrees; where θ 3= θ 4.

Specifically, the second sliding contact 401 includes a third sub-sliding contact 402 and a third sub-sliding contact 403, the third sub-sliding contact 402 is connected to the second power supply positive terminal 400, and the fourth sub-sliding contact 403 is connected to the ignition wire terminal 500;

the third sub-sliding contact 402 comprises a third contact section 404 and a third contact section 405, the third contact section 404 is connected with the third contact section 405, the third contact section 404 is positioned on one side of the third sub-sliding contact 402 close to the second power supply positive terminal 400, the third contact section 405 is positioned on one side of the third sub-sliding contact 402 far away from the second power supply positive terminal 400, the included angle between the third contact section 404 and the third contact section 405 is theta 3, 180 degrees is more than theta 3 and more than 90 degrees, namely, the third contact section 405 is in direct contact with the conductive terminal 201, the third contact section 404 and the third contact section 405 are obtuse angles, the third contact section 405 is inclined downwards, and the included angle theta 3 faces the buffer pad 101;

the fourth sub sliding contact 403 comprises a fourth contact section 406 and a fourth contact section 407, the fourth contact section 406 is connected with the fourth contact section 407, the fourth contact section 406 is positioned on one side of the fourth sub sliding contact 403 close to the ignition filament terminal 500, the fourth contact section 407 is positioned on one side of the fourth sub sliding contact 403 far away from the ignition filament terminal 500, the included angle between the fourth contact section 406 and the fourth contact section 407 is theta 4, and 180 degrees is more than theta 4 and more than 90 degrees; that is to say: the fourth contact section 407 directly contacts with the conductive terminal 201, an obtuse angle is formed between the fourth contact section 406 and the fourth contact section 407, the fourth contact section 407 is inclined downward, and the included angle θ 4 faces the cushion pad 101; with the scheme, the insulating slider 200 with the conductive terminal 201 can slide smoothly, and due to the fact that the cushion pad 101 is arranged at the bottom of the insulating cylinder 100, the positive and negative electrode conduction time of the first power supply positive terminal 300 and the power supply negative terminal 600 can be long enough, so that the conductive terminal 201 is stagnated at the second sliding contact 401, and residual charges in the capacitor can be neutralized better.

In an alternative embodiment of the present invention, a length d4 between the third contact segment 405 and the fourth contact segment 407 along the second direction F is slightly smaller than the diameter of the conductive terminal 201, wherein the slightly smaller range is 0.5-1cm; if the distance is less than 0.5cm, the contact between the third contact section 405 and the fourth contact section 407 and the conductive terminal 201 is insufficient, and if the distance is greater than 1cm, the conductive terminal 201 cannot slide smoothly; therefore, the range slightly smaller than the first direction F is limited to 0.5-1cm, the second direction F intersects with the first direction E, the length d5 of the first contact segment 305 and the second contact segment 307 in the second direction F is also slightly smaller than the diameter of the conductive terminal 201, the range slightly smaller than the first direction F can be 0.5-1cm, if the length d5 is smaller than the diameter of the conductive terminal 201, the first contact segment 305 and the second contact segment 307 are not in sufficient contact with the conductive terminal 201, and if the length d is larger than 1cm, the conductive terminal 201 cannot slide smoothly; therefore, the range slightly smaller than the range is limited to 0.5-1cm, so that the first contact section 305 and the second contact section 307 can be in more complete contact with the conductive terminal 201, the anode and the cathode of the power supply are communicated, and the residual charge in the capacitor is directly neutralized; the third contact section 405 and the fourth contact section 407 are more fully contacted with the conductive terminal 201, so that the positive electrode of the high-voltage capacitor is conducted with the positive electrode of the ignition wire 13, and the power supply supplies power to the ignition wire 13.

Fig. 4 is a schematic structural diagram of a coaxial cylindrical deflagration driving device for a shock tube/wind tunnel according to an embodiment of the present invention; FIG. 5 is an enlarged view of the structure at B in FIG. 4; as shown in fig. 4-5, this embodiment provides a coaxial cylindrical detonation driving device for a shock tube/wind tunnel, including a detonation driving section 1, a driven section 2, a diaphragm 5 for separating the detonation driving section 1 from the driven section 2, a blind plate 14, and a discharge system 7, where one end of the detonation driving section 1 is communicated with the driven section 2, and the other end is connected to the blind plate 14;

the detonation driving section 1 is a straight pipe with an equal section, a first electrode 11 and a second electrode 12 which extend along the radial direction Y are inserted into the detonation driving section 1, the first electrode 11 is positioned on one side of the detonation driving section, which is close to a blind plate 14, the second electrode 12 is positioned on one side of the detonation driving section 1, which is close to a driven section 2, an ignition wire 13 which extends along the axial direction X is electrically connected between the first electrode 11 and the second electrode 12, the axial direction X is the direction from the detonation driving section 1 to the axial center line of the driven section 2, and the radial direction Y is intersected with the axial direction X;

in the axial direction X, the length between the first electrode 11 and the blind plate 14 is L1, the length between the second electrode 12 and the diaphragm 5 is L2, and the lengths of L1 and L2 are limited to 0.5cm-20cm;

the deflagration driving section 1 is provided with an opening 8 matched with the first electrode 11 and the second electrode 12, and the contact surfaces of the first electrode 11 and the second electrode 12 with the opening 8 are provided with sealing rings 81;

combustible mixed gas is filled in the deflagration driving section 1;

the discharging system 7 comprises a gravity type high-voltage pulse discharging switch 1000 and a high-voltage capacitor 71, wherein the gravity type high-voltage pulse discharging switch 1000 comprises an insulating cylinder 100, an insulating slide block 200, a first power supply positive terminal 300, a second power supply positive terminal 400, an ignition filament terminal 500 and a power supply negative terminal 600, and the gravity type high-voltage pulse discharging switch 1000 is the gravity type high-voltage pulse discharging switch 1000 for the coaxial cylindrical surface detonation driving device;

an ignition loop is formed by the positive electrode of the high-voltage capacitor 71, a second power supply positive terminal 400, a second sliding contact 401, a conductive terminal 201, an ignition filament terminal 500, a first electrode 11, an ignition filament 13, a second electrode 12 and the negative electrode of the high-voltage capacitor 71; the unloading loop is formed by the anode of the high-voltage capacitor 71, the first power supply anode terminal 300, the first sliding contact 301, the conductive terminal 201, the power supply cathode terminal 600 and the cathode of the high-voltage capacitor 71, the first power supply anode terminal 300 and the second power supply anode terminal 400 are connected in parallel, the high-voltage capacitor 71 is used for storing high voltage and discharging to an ignition wire, and the high-voltage capacitor 71 can generate 2000V high voltage.

Specifically, the coaxial cylindrical surface detonation driving device for the shock tube/wind tunnel comprises a detonation driving section 1 and a driven section 2, one end of the detonation driving section 1 is communicated with the driven section 2, the other end of the detonation driving section 1 is connected with a blind plate 14, a diaphragm 5 is arranged between the detonation driving section 1 and the driven section 2, the driven section 2 is communicated with a test section 4 through a spray pipe 3, the blind plate 14 is a flange cover, the end of the detonation driving section 1 is plugged by using the blind plate 14, the traditional explosion unloading section is not required to be used, and the diaphragm is arranged between the explosion unloading section and the detonation driving section, so that the occupied space area is favorably reduced, and the cost can be reduced;

a first electrode 11 and a second electrode 12 extending along the radial direction Y are inserted into the deflagration driving section 1, the first electrode 11 is positioned at one side of the deflagration driving section 1 close to the blind plate 14, the second electrode 12 is positioned at one side of the deflagration driving section 1 close to the driven section 2, that is, the first electrode 11 and the second electrode 12 are inserted into two ends of the deflagration driving section 1; an ignition wire 13 extending along the axial direction is electrically connected between the first electrode 11 and the second electrode 12, the axial direction X is the direction pointing to the axial center line of the driven section 2 from the blind plate 14, the radial direction Y intersects with the axial direction X, optionally, the ignition wire 13 may be made of any one metal material of copper, silver, nickel-chromium, tungsten and alloy, and the length of the ignition wire 13 is adjusted according to the length of the deflagration driving section 1;

the axial distance from the first electrode 11 to the blind plate 14 is L1, the axial distance from the second electrode 12 to the diaphragm 5 is L2, and if the lengths of L1 and L2 are less than 0.5cm, breakdown is likely to occur, so that equipment is damaged or the safety of personnel is harmed; if the lengths of the L1 and the L2 are greater than 20cm, the combustible mixed gas in the deflagration driving section 1 may be unstably combusted, and therefore, the lengths of the L1 and the L2 are limited to 0.5cm-20cm, so that the igniter wire 13 is arranged to be longer in the deflagration driving section as far as possible, the combustible mixed gas in the deflagration driving section 1 can be more sufficiently combusted, and the distances between the first electrode 11 and the end of the deflagration driving section and between the second electrode 12 and the membrane 5 can be avoided from being too close, so that breakdown is avoided, and the safety of equipment and personnel is ensured;

in order to display the opening 8 on the drawing, the aperture of the opening 8 is drawn to be larger than the actual value in fig. 5, the opening 8 is matched with the first electrode 11, the second electrode 12 is matched with the opening 8, the first electrode 11 and the second electrode 12 are conveniently inserted into the combustion driving section 1 through the opening 8, in order to ensure the sealing performance in the detonation driving section 1, after the first electrode 11 is inserted into the detonation driving section 1, a sealing ring 81 is arranged on the contact surface of the detonation driving section 1, where the first electrode 1 is in contact with the opening 8, and a sealing ring 81 is arranged on the contact surface of the detonation driving section 1, where the second electrode 12 is in contact with the opening 8;

combustible mixed gas is filled in the deflagration driving section 1, and the combustible mixed gas can comprise fuel, oxidant and inert gas, wherein the fuel can be hydrogen, carbon monoxide or alkane alkene alkyne, and can also be other combustible gas; the oxidant is oxygen or nitrous oxide, and can also be other oxidizing gases, the inert gas is nitrogen, rare gas or carbon dioxide, and can also be other gases which do not participate in the combustion reaction; fuel: oxidizing agent: the ratio between the inert gases may be 1: oxidizing agent: the ratio between the inert gases can also be 2: oxidizing agent: the proportion among the inert gases can also be 2;

the discharge system 7 comprises a gravity type high-voltage pulse discharge switch 1000 and a high-voltage capacitor 71, the gravity type high-voltage pulse discharge switch 1000 comprises an insulating cylinder 100, an insulating slide block 200, a first power supply positive terminal 300, a second power supply positive terminal 400, an ignition filament terminal 500 and a power supply negative terminal 600, and the gravity type high-voltage pulse discharge switch 1000 is the gravity type high-voltage pulse discharge switch 1000 for the coaxial cylindrical surface detonation driving device;

specifically, a buffer pad 101 is arranged at the bottom end in the insulating cylinder 100; an insulating slide block 200 is arranged in the insulating cylinder 100, and a conductive terminal 201 is arranged on one side, close to the buffer pad 101, of the insulating slide block 200; the first power supply positive terminal 300 and the power supply negative terminal 600 are respectively arranged on one side, close to the cushion pad 101, of the insulating cylinder 100, and the first power supply positive terminal 300 corresponds to the power supply negative terminal 600; the second power supply positive terminal 400 is mounted on the side of the insulating cylinder 100 close to the first power supply positive terminal 300 far from the cushion pad 101, and the ignition wire terminal 500 is mounted on the side of the insulating cylinder 100 close to the power supply negative terminal 600 far from the cushion pad 101, wherein the second power supply positive terminal 400 corresponds to the ignition wire terminal 500; the first power supply positive terminal 300 and the power supply negative terminal 600 are both provided with a first sliding contact 301 which is in contact with the conductive terminal 201, and the first sliding contact 301 of the first power supply positive terminal 300 is electrically connected with the first sliding contact 301 of the power supply negative terminal 600 through the conductive terminal 201; the second power supply positive terminal 400 and the ignition filament terminal 500 are both provided with a second sliding contact 401 which is in contact with the conductive terminal 201, and the second sliding contact 401 of the second power supply positive terminal 400 is electrically connected with the second sliding contact 401 of the ignition filament terminal 500 through the conductive terminal 201;

an ignition loop is formed by the positive electrode of the high-voltage capacitor 71, a second power supply positive terminal 400, a second sliding contact 401, a conductive terminal 201, an ignition wire terminal 500, a first electrode 11, an ignition wire 13, a second electrode 12 and the negative electrode of the high-voltage capacitor 71; the unloading loop is formed by the positive pole of the high-voltage capacitor 71, the first power supply positive pole binding post 300, the first sliding contact 301, the conductive terminal 201, the power supply negative pole binding post 600 and the negative pole of the high-voltage capacitor 71, and the first power supply positive pole binding post 300 and the second power supply positive pole binding post 400 are connected in parallel, namely, the ignition loop is connected in parallel with the unloading loop; the high voltage capacitor 71 is used to store high voltage electricity and discharge the electricity to the ignition wire.

After the high-voltage capacitor 71 is charged, when the conductive terminal 201 is in contact with the second power supply positive terminal 400 and the second sliding contact 401 on the ignition wire terminal 500, the positive electrode of the high-voltage capacitor 71 is conducted with the first electrode 11, and the high-voltage capacitor 71 supplies power to the ignition wire 13; as the conductive terminal 201 continues to fall, the conductive terminal 201 disengages from the second sliding contact 401, and the power supply to the ignition wire 13 is stopped; after the preset time is continued, the conductive terminal 201 is contacted with the first sliding contact 301 on the first power supply positive terminal 300 and the power supply negative terminal 600, the positive electrode and the negative electrode of the power supply are communicated, the residual charge in the capacitor is directly neutralized, and unloading is finished, wherein the preset time can be 5-30 milliseconds.

The coaxial cylindrical surface detonation driving device for the shock tube/wind tunnel is assembled in the following sequence:

providing a detonation driver stage 1;

firstly, an opening 8 for placing a first electrode 11 and a second electrode 12 is formed in a deflagration driving section 1; secondly, installing sealing rings 81 on contact surfaces of the first electrode 11 and the second electrode 12 and the opening 8, and then inserting the first electrode 11 and the second electrode 12 into the opening 8, wherein the first electrode 11 is positioned on one side of the deflagration driving section, which is close to the blind plate 14, and the second electrode 12 is positioned on one side of the deflagration driving section 1, which is close to the driven section 2, after the first electrode 11 and the second electrode 12 are inserted; an ignition wire 13 extending along the axial direction X is connected between the first electrode 11 and the second electrode 12;

a diaphragm is arranged between the deflagration driving section 1 and the driven section 2, one end of the deflagration driving section 1 close to the diaphragm 5 is connected with the driven section 2, and the other end is connected with a blind plate 14;

combustible mixed gas is filled in the deflagration driving section 1;

assembling a discharge system 7, wherein a first power supply positive terminal 300 and a second power supply positive terminal 400 are respectively and electrically connected with the positive electrode of a high-voltage capacitor 71, an ignition filament terminal 500 is electrically connected with a first electrode 11, a second electrode 12 is electrically connected with the negative electrode of the high-voltage capacitor 71, and the first power supply positive terminal 300 and the second power supply positive terminal 400 are connected in parallel, wherein the positive electrode of the high-voltage capacitor 71, the second power supply positive terminal 400, a second sliding contact 401, a conductive terminal 201, the ignition filament terminal 500, the first electrode 11, an ignition filament 13, the second electrode 12 and the negative electrode of the high-voltage capacitor 71 form an ignition loop; an unloading loop is formed by the anode of the high-voltage capacitor 71, the first power supply anode binding post 300, the first sliding contact 301, the conductive terminal 201, the power supply cathode binding post 600 and the cathode of the high-voltage capacitor 71.

The coaxial cylindrical surface detonation driving device for the shock tube/wind tunnel is assembled according to the assembling sequence, so that the first electrode and the second electrode can be better inserted, the ignition wire 13 is more accurately arranged, the gas leakage of combustible mixed gas can be avoided, the personal safety is ensured, and the operation is convenient.

Of course, without considering the discharge of the high-voltage capacitor to the ignition wire, the above assembly sequence may be adjusted appropriately, and after the driven segment 2 or the blind plate 14 is installed, the discharge system 7 may be assembled first, and then the deflagration driving segment 1 may be filled with the combustible mixture, which is as follows:

first, a detonation driver stage 1 is provided;

secondly, firstly, an opening 8 for placing a first electrode 11 and a second electrode 12 is formed on the deflagration driving section 1; secondly, installing sealing rings 81 on contact surfaces of the first electrode 11 and the second electrode 12 and the opening 8, and then inserting the first electrode 11 and the second electrode 12 into the opening 8, wherein the first electrode 11 is positioned on one side of the deflagration driving section, which is close to the blind plate 14, and the second electrode 12 is positioned on one side of the deflagration driving section 1, which is close to the driven section 2, after the first electrode 11 and the second electrode 12 are inserted; an ignition wire 13 extending along the axial direction X is connected between the first electrode 11 and the second electrode 12;

thirdly, a diaphragm is arranged between the deflagration driving section 1 and the driven section 2, one end of the deflagration driving section 1 close to the diaphragm 5 is connected with the driven section 2, and the other end of the deflagration driving section 1 is connected with a blind plate 14;

fourthly, assembling the discharge system 7, electrically connecting the first power supply positive terminal 300 and the second power supply positive terminal 400 with the positive electrode of the high-voltage capacitor 71 respectively, electrically connecting the ignition filament terminal 500 with the first electrode 11, electrically connecting the second electrode 12 with the negative electrode of the high-voltage capacitor 71, and connecting the first power supply positive terminal 300 and the second power supply positive terminal 400 in parallel, wherein the positive electrode of the high-voltage capacitor 71, the second power supply positive terminal 400, the second sliding contact 401, the conductive terminal 201, the ignition filament terminal 500, the first electrode 11, the ignition filament 13, the second electrode 12 and the negative electrode of the high-voltage capacitor 71 form an ignition loop; an unloading loop is formed by the anode of the high-voltage capacitor 71, the first power supply anode binding post 300, the first sliding contact 301, the conductive terminal 201, the power supply cathode binding post 600 and the cathode of the high-voltage capacitor 71;

fifthly, combustible mixed gas is filled in the deflagration driving section 1.

It should be noted that: first, a detonation driver stage 1 is provided; secondly, firstly, an opening 8 for placing a first electrode 11 and a second electrode 12 is formed on the deflagration driving section 1; secondly, installing sealing rings 81 on contact surfaces of the first electrode 11 and the second electrode 12 and the opening 8, and then inserting the first electrode 11 and the second electrode 12 into the opening 8, wherein the first electrode 11 is positioned on one side of the deflagration driving section, which is close to the blind plate 14, and the second electrode 12 is positioned on one side of the deflagration driving section 1, which is close to the driven section 2, after the first electrode 11 and the second electrode 12 are inserted; an ignition wire 13 extending along the axial direction X is connected between the first electrode 11 and the second electrode 12; thirdly, a diaphragm is arranged between the deflagration driving section 1 and the driven section 2, one end of the deflagration driving section 1 close to the diaphragm 5 is connected with the driven section 2, and the other end of the deflagration driving section 1 is connected with a blind plate 14; the three-step assembly sequence is irreversible, i.e. the assembly sequence cannot be reversed, and cannot be implemented.

The working principle is as follows: an ignition wire 13 arranged along the axial direction X is arranged in the deflagration driving section 1, after a high-voltage capacitor 71 is charged, an ignition loop is closed firstly, the high-voltage capacitor 71 is conducted with the ignition wire 13 through a first electrode 11 and a second electrode 12, high voltage of thousands to tens of thousands of volts is applied to two ends of the ignition wire 13, at the moment of electrifying the ignition loop, the ignition wire 13 violently heats, combustible mixed gas near the ignition wire 13 is ignited within microsecond-order time, and a columnar flame surface is formed after ignition and radially expands; the ignition wire 13 is strictly coaxial with the pipeline of the deflagration driving section 1, so that all parts along the axial direction are ensured to be burnt out simultaneously; because the discharging process of the high-voltage capacitor 71 is longer than the burning process, the residual charge in the high-voltage capacitor 71 needs to be unloaded before the burning is finished, after the preset time is continued, the unloading loop is closed, the anode and the cathode of the high-voltage capacitor 71 are short-circuited, the charge in the high-voltage capacitor 71 instantly returns to the high-voltage capacitor 71 through the unloading loop to finish unloading, and therefore the situation that the combustion products are broken through near the anode of the high-voltage capacitor 71 to cause safety accidents is prevented.

It should be noted that: the detonation drive needs to form detonation waves propagating along the axial direction in the pipeline of the driving section, and the deflagration drive simultaneously ignites the gas in the pipeline of the deflagration driving section 1 along the axial direction, completes combustion in a deflagration rather than detonation mode, and simultaneously finishes combustion along the axial direction X.

Typically, the effective operating time of the shock tube/tunnel is on the order of approximately a few milliseconds to 100 milliseconds, and in order to provide accurate test conditions, it is critical to ensure that the combustible mixture in the deflagration-driven segment ignites simultaneously and burns out simultaneously.

According to the embodiment, the coaxial cylindrical surface detonation driving device for the shock tube/wind tunnel provided by the invention at least realizes the following beneficial effects:

firstly, in the prior art, detonation waves propagating along the axial direction are formed in a driving section pipeline by detonation driving, because the extremely high pressure peak of the detonation waves cannot be completely used for driving, the effective pressure provided by the detonation driving is greatly lower than the pressure bearing limit of equipment, and in the invention, detonation is used for replacing detonation, the pressure peak in detonation does not exist, and the combustion pressure can be 100% used for compressing test gas, so that the pressure of the test gas is improved;

secondly, the gas mixture ratio limit of deflagration is much wider than detonation, the temperature and sound velocity range of the driving gas is larger, and the corresponding total temperature range of the test gas is also larger than detonation driving.

Thirdly, the ignition wire is powered by connecting the high-voltage capacitor positive electrode, a second power supply positive electrode binding post, a second sliding contact, a conductive terminal and the ignition wire electrode binding post in series, the millisecond-level time precision can be ensured, and the accurate control of the electrifying time is realized;

fourthly, the conductive terminal is directly stopped on the first sliding contact under the condition of almost no rebound through the buffer cushion, and accidental breakdown caused by the fact that the conductive terminal conducts the ignition loop again is avoided.

Fig. 6 is a schematic structural diagram of a shock tube/wind tunnel according to an embodiment of the present invention; the embodiment of the invention also provides a shock tube/wind tunnel, which comprises the coaxial cylindrical surface detonation driving device for the shock tube/wind tunnel provided by the embodiment of the invention.

Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A gravity type high-voltage pulse discharge switch for a coaxial cylindrical surface detonation driving device is characterized by comprising an insulating cylinder, an insulating slide block, a first power supply positive terminal, a second power supply positive terminal, an ignition filament terminal and a power supply negative terminal;

a buffer cushion is arranged at the bottom end in the insulating cylinder;

the first power supply positive terminal and the power supply negative terminal are both provided with first sliding contacts which are contacted with the conductive terminals, and the first sliding contacts of the first power supply positive terminal are electrically connected with the first sliding contacts of the power supply negative terminal through the conductive terminals;

the insulating cylinder and the insulating slide block are respectively in a cylinder shape, the section of the cylinder along a first direction is circular or square, the length of the insulating slide block along the first direction is greater than the diameter of the insulating slide block, and the first direction is a direction from the insulating slide block to the cushion pad;

2. A gravity type high voltage pulse discharge switch for a coaxial cylinder detonation driver apparatus according to claim 1, wherein the first sliding contact includes a first sub sliding contact connected to the first power supply positive terminal and a second sub sliding contact connected to the power supply negative terminal;

wherein θ 1= θ 2.

3. The gravity type high-voltage pulse discharge switch for the coaxial cylindrical surface detonation driving device according to claim 2, characterized in that the length between the first contact section and the second contact section in a second direction is slightly smaller than the diameter of the conductive terminal, wherein the slightly smaller range is 0.5-1cm, and the second direction is intersected with the first direction.

4. A gravity type high voltage pulse discharge switch for a coaxial cylinder detonation driver device according to claim 2, characterised in that the second sliding contact includes a third sub sliding contact connected to the second power supply positive terminal and a fourth sub sliding contact connected to the ignition wire terminal;

the fourth sub-sliding contact comprises a fourth contact section and a fourth contact section connected with the fourth contact section, the fourth contact section is positioned on one side, close to the ignition filament wiring terminal, of the fourth sub-sliding contact, the fourth contact section is positioned on one side, far away from the ignition filament wiring terminal, of the fourth sub-sliding contact, an included angle between the fourth contact section and the fourth contact section is theta 4, and 180 degrees is larger than theta 4 and larger than 90 degrees; where θ 3= θ 4.

5. The gravity-type high-voltage pulse discharge switch for the coaxial cylinder detonation driver device according to claim 4, wherein a length between the first contact section and the second contact section in the second direction is slightly smaller than a diameter of the conductive terminal; the length between the third contact section and the fourth contact section along the second direction is slightly smaller than the diameter of the conductive terminal, wherein the range of slightly smaller is 0.5-1cm, and the second direction is intersected with the first direction.

6. The gravity type high voltage pulse discharge switch for the coaxial cylinder detonation driver device according to claim 1, wherein the length of the insulating slider in the first direction is 5-10cm, and the diameter of the insulating slider is 3-4cm.

7. A gravity type high voltage pulse discharge switch for a coaxial cylindrical deflagration actuated device according to claim 1, characterized in that d1=2-3cm, d2=4-5cm, d3=1-2cm.

8. A gravity type high voltage pulse discharge switch for a coaxial cylinder detonation driver device in accordance with claim 1, wherein the buffer pad is a foam pad, a rubber pad or an inflatable pad.

9. A gravity type high voltage pulse discharge switch for a coaxial cylinder detonation driving device according to any one of claims 1-8, wherein the insulating slider is made of plastic, rubber or wood.