Flexible high-voltage electrode for coaxial cylindrical deflagration drive device

Abstract

This invention discloses a flexible high-voltage electrode for a coaxial cylindrical deflagration driving device, comprising a conductive core electrode, an insulating sleeve, a threaded cap, a sealing ring, and a locking screw. The insulating sleeve covers the outer surface of the conductive core electrode, which is inserted into the deflagration driving section and connected to the section via the threaded cap. The conductive core electrode includes a first conductive core electrode portion, a second conductive core electrode portion, and a third conductive core electrode portion. The insulating sleeve includes a first covering portion, a second covering portion, and a third covering portion. A support member is also included, which cooperates with the conductive core electrode. The support member includes a collar and a flexible bracket. The flexible bracket includes a first connecting wire, a second connecting wire, a third connecting wire, and a coil, with a central hole on the coil. This invention avoids direct impact of the metal diaphragm on the conductive core electrode, ensuring that the conductive core electrode is not damaged. It also reduces costs and eliminates the need to install and remove the insulating core electrode before and after each experiment.

Description

Technical Field

[0001] This invention relates to the technical field of experimental research on high-temperature high-speed gas dynamics, high-speed aircraft, etc., and more specifically, to a flexible high-voltage electrode for a coaxial cylindrical deflagration drive device. Background Technology

[0002] A shock tube / wind tunnel is an experimental device widely used in fields such as high-temperature, high-speed gas dynamics and high-speed aircraft. Its basic principle is that high-pressure driving gas compresses low-pressure test gas through a shock wave, bringing it to the required experimental state. For example... Figure 1 As shown, a typical shock tube / wind tunnel includes a drive section 1', a driven section 2', a nozzle 3', and a test section 4'. Before the test, the drive section 1' and the driven section 2' are separated by a diaphragm 5'. High-pressure drive gas is filled into the drive section 1', and low-pressure test gas is filled into the driven section 2'. During the test, the diaphragm 5' ruptures, the high-pressure gas expands and enters the driven section 2', and a rapidly moving shock wave is generated in the driven section 2'. If the gas after the shock wave is used directly for the test, the equipment operates in shock tube mode; if the test gas accelerated by the nozzle 3' is used for the test, the equipment operates in shock tunnel mode.

[0003] The total temperature and total pressure range of the test gas are key indicators of equipment capability, both of which depend on the driving capability of the high-pressure driving gas. Room temperature, high-pressure gases can no longer meet increasingly demanding testing requirements. Therefore, three high-performance driving technologies have been developed both domestically and internationally: piston-driven, heated light gas-driven, and detonation-driven. Among these, detonation-driven technology is characterized by low cost, simple structure, and relatively high safety, and is currently the mainstream technology in China.

[0004] The detonation-driven shock tube was first proposed by Bird in 1957. In 1981, Mr. Yu Hongru of the Institute of Mechanics, Chinese Academy of Sciences, built a 13.3m long detonation-driven shock tube, which was put into use in 1983. In 1994, the Institute of Mechanics, Chinese Academy of Sciences, developed the JF-10 detonation-driven high-enthalpy shock tunnel [see Yu Hongru, Zhao Wei, and Yuan Shengxue, Performance of Hydrogen-Oxygen Detonation-Driven Shock Tunnel - Aerodynamic Testing and Measurement Control, 1993, 7(3): 38-42]. With the help of Mr. Yu Hongru, Gronig et al. built a high-enthalpy shock tunnel (TH2-D) using reverse detonation drive at RWTH Aachen University in Germany in 1993. In 1994, NASA modified the original free piston drive design and built the Hypulse wind tunnel at GASL. This wind tunnel can operate in both reflected shock tunnel mode and expansion tube mode. [See ChueRSM, Tsai CY, Bakos RJ, Erdos JI, Rogers RC (2002) NASA's Hypulse Facility at GASL - A Dual Mode, Dual Driver Reflected-Shock / Expansion Tunnel. In: Lu F, Marren D (eds), Advanced Hypersonic Test Facilities, Progress in Astronautics and Aeronautics, Vol. 198, AIAA, Chapter 3, pp29-71].

[0005] Detonation-driven systems require the formation of an axially propagating detonation wave within the drive section. The non-uniform flow field following the detonation wave leads to the following problems with this drive technology: First, the range of detonable gas mixing ratios is much narrower than that of combustible systems, and the range of temperature and sound velocity of the drive gas is also correspondingly narrower, thus limiting the total temperature range of the test gas that detonation-driven systems can provide; Second, the effective drive pressure provided by detonation-driven systems does not exceed 40% of the equipment's pressure limit, thus limiting the total pressure range of the test gas.

[0006] Due to the above problems of detonation drive, it is necessary to overcome these problems and introduce coaxial cylindrical detonation drive technology. However, coaxial cylindrical detonation drive technology requires high-voltage electrodes to be inserted at both ends of the drive section, and an ignition wire to be arranged between the two high-voltage electrodes along the axis of the drive section. However, the high-voltage electrode still needs to meet the following requirements: (1) Detonation drive technology needs to generate high-temperature and high-pressure gas of several megapascals to nearly 100 megapascals in the drive section pipe, and the sealing between the electrode and the pipe body must be ensured. At the same time, the electrode and the pipe body must be insulated and withstand high voltage of tens of thousands of volts. (2) In order to ensure the precise coaxiality between the ignition wire and the drive section pipe, the two high-voltage electrodes need to straighten the ignition wire of 10 meters or even longer, and a new ignition wire needs to be replaced before each experiment. Therefore, the electrode should also be as easy as possible to install the ignition wire. (3) Since the metal diaphragm often bounces back after breaking, it is also necessary to avoid the metal diaphragm from impacting the electrode at high speed. To address the aforementioned requirements, conventional high-voltage electrodes consist of a conductive core electrode covered with an insulating layer. When the conductive chip is installed on a device, a thread is threaded onto the outer surface of the insulating layer to facilitate fastening, but this cannot meet the requirements of coaxial cylindrical deflagration drive technology.

[0007] Existing document 1 (CN2228804Y) discloses a high-voltage electrode rod, which has a rod body, an end cap, and a coupling. The rod body has a copper cable core in the middle, and the copper core is surrounded by a cable insulation layer. The exposed part of the lower end of the copper cable core is fitted with a screw plug. The screw plug and the outer end of the rod body are fitted with an end cap sealed by threads. The upper part of the coupling is provided with a tapered locking bolt and a locking nut for locking the cable. The rod body has been increased from the original 450mm to about 600mm. However, this high-voltage electric shock rod still does not solve the above-mentioned technical problems. In addition, the high-voltage electric shock rod is relatively thick and inconvenient to operate.

[0008] Existing document 2 (CN102407947A) discloses a shock tunnel detonation dual-drive device, comprising: a shock tunnel having a detonation drive section, one end of which is provided with a detonation unloading section, and the other end with a driven section; a first diaphragm is provided between the detonation unloading section and the detonation drive section, and a second diaphragm is provided between the driven section and the detonation drive section; a forward detonation drive ignition device is provided in the section of the detonation drive section near the detonation unloading section, and a reverse detonation drive ignition device is provided in the section of the detonation drive section near the driven section; a controllable delay trigger is connected between the forward detonation drive ignition device and the reverse detonation drive ignition device. The apparatus and method are as follows: 1) A forward detonation ignition device is installed at one end of the detonation driving section of the shock tunnel near the detonation unloading section, and a reverse detonation driving ignition device is installed at one end of the detonation driving section near the driven section; 2) Ignition is performed by the forward detonation ignition device to form a forward driving detonation wave; 3) After the forward detonation wave has propagated along the detonation driving section for a predetermined time, it is ignited by the reverse detonation driving ignition device to form a reverse driving detonation wave; 4) The reverse driving detonation wave tears the diaphragm set between the driven section and the detonation driving section, and the forward detonation wave and the reverse detonation wave intersect to form a moving shock wave, which enters the driven section to compress the test gas in the driven section.

[0009] To meet the requirements of coaxial cylindrical surface deflagration drive technology, this invention proposes a flexible high-voltage electrode for a coaxial cylindrical surface deflagration drive device, and this flexible high-voltage electrode for a coaxial cylindrical surface deflagration drive device is not easily conceived by those skilled in the art. Summary of the Invention

[0010] In view of this, the present invention provides a flexible high-voltage electrode for a coaxial cylindrical deflagration drive device, comprising a conductive core electrode, an insulating sleeve, a threaded cap, a sealing ring, and a locking screw, wherein the insulating sleeve covers the outer surface of the conductive core electrode, the sealing ring and the threaded cap are both sleeved on the outer surface of the insulating sleeve, the conductive core electrode covered with the insulating sleeve is inserted into the deflagration drive section, and is connected to the deflagration drive section through the threaded cap;

[0011] The conductive core includes a first conductive core portion, a second conductive core portion, and a third conductive core portion. One end of the second conductive core portion is connected to the end of the first conductive core portion near the second conductive core portion, and the other end is connected to the end of the third conductive core portion near the second conductive core portion. The end of the first conductive core portion away from the second conductive core portion is electrically connected to a high-voltage power supply. The end of the third conductive core portion away from the second conductive core portion is connected to the locking screw. After the locking screw is tightened to the third conductive core portion, the end of the locking screw away from the second conductive core portion is flush with the inner wall of the deflagration drive section.

[0012] The diameters of the first conductive core portion and the third conductive core portion are both smaller than the diameter of the second conductive core portion;

[0013] The insulating sleeve includes a first covering portion that cooperates with the first conductive core electrode portion, a second covering portion that corresponds to the second conductive core electrode portion, and a third covering portion that cooperates with the third conductive core electrode portion. In the first direction, the length of the first conductive core electrode portion is a1, the length of the third conductive core electrode portion is a2, the length of the first covering portion is b1, a1>b1, a1>a2, and the first direction is the direction in which the third conductive core electrode portion points to the first conductive core electrode portion.

[0014] The sealing ring is located on the side of the third covering portion closer to the second covering portion, the threaded cap is located on the side of the first covering portion closer to the second covering portion, and the second covering portion is located between the sealing ring and the threaded cap;

[0015] The contact surfaces between the sealing pressure ring and the deflagration drive section, and between the sealing pressure ring and the third covering part, are respectively equipped with sealing rings;

[0016] It also includes a support member that cooperates with the conductive core electrode covered by the insulating sleeve. The support member includes a collar nested in the deflagration drive section and a flexible bracket connected to the collar. The flexible bracket includes a first connecting wire, a second connecting wire, a third connecting wire, and a coil. The first connecting wire, the second connecting wire, and the third connecting wire are connected to the collar at their ends near the collar, and the first connecting wire, the second connecting wire, and the third connecting wire are connected to the coil at their ends away from the collar. The coil has a central hole, and the ignition wire is led out from the conductive core electrode and passes through the central hole. The central hole and the axis of the deflagration drive section are located on the same horizontal plane.

[0017] The flexible support is made of polytetrafluoroethylene.

[0018] The collar is made of metal.

[0019] Optionally, the inner part of the collar is divided into three equal parts to form a first collar division point, a second collar division point, and a third collar division point; the outer part of the coil is divided into three equal parts to form a first coil division point corresponding to the first collar division point, a second coil division point corresponding to the second collar division point, and a third coil division point corresponding to the third collar division point.

[0020] The first connecting line connects to the first loop division point and the first coil division point at both ends, the second connecting line connects to the second loop division point and the second coil division point at both ends, and the third connecting line connects to the third loop division point and the third coil division point at both ends.

[0021] Optionally, the diameter of the middle part of the second conductive core electrode is larger than the diameter of both ends of the second conductive core electrode, and the diameter of the middle part of the second conductive core electrode gradually decreases towards both ends along the first direction.

[0022] Optionally, the insulating sleeve is made of radiation-crosslinked polyolefin material.

[0023] Optionally, the diameter of the conductive core electrode is 5mm-20mm.

[0024] Compared with the prior art, the flexible high-voltage electrode for a coaxial cylindrical deflagration driving device provided by the present invention achieves at least the following beneficial effects:

[0025] First, by cooperating with the conductive core electrode, locking screw, and support, the locking screw is tightened onto the third conductive core electrode. The end of the locking screw away from the second conductive core electrode is flush with the inner wall of the deflagration drive section. Furthermore, the central hole on the coil is located on the same horizontal plane as the axis of the deflagration drive section. This not only prevents the metal diaphragm from directly impacting the conductive core electrode, ensuring it is not damaged and thus reducing costs, but also eliminates the need to install and remove the insulating sleeve-covered conductive core electrode before and after each experiment. It also facilitates the installation or replacement of the ignition wire while ensuring coaxiality between the ignition wire and the deflagration drive section. By using polytetrafluoroethylene (PTFE) material for the flexible support, the cost of use is effectively reduced.

[0026] Second, by making the diameters of the first and third conductive core portions smaller than the diameter of the second conductive core portion, that is, by making the second conductive core portion a protruding part, the conductive core portion can be prevented from flying out under high air pressure.

[0027] Third, the insulating sleeve wrapped around the outer surface of the conductive core can ensure the insulation between the conductive core and the deflagration drive section, and can withstand high voltage of tens of thousands of volts.

[0028] Fourth, the sealing rings installed on the contact surfaces between the sealing ring and the deflagration drive section, and between the sealing ring and the third covering part, respectively, can ensure the airtightness between the insulating sleeve fitted on the outer surface of the conductive core and the deflagration drive section.

[0029] Of course, any product implementing this invention does not necessarily need to achieve all of the technical effects described above at the same time.

[0030] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0031] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the invention and, together with their description, serve to explain the principles of the invention.

[0032] Figure 1 This is a schematic diagram of a shock tube / wind tunnel provided in the prior art;

[0033] Figure 2 This is an assembly diagram of a flexible high-voltage electrode and a deflagration driving section for a coaxial cylindrical deflagration driving device provided by an embodiment of the present invention;

[0034] Figure 3 yes Figure 2 Cross-sectional view of AA;

[0035] Figure 4 This is an assembly diagram of the conductive core, insulating sleeve, threaded cap, and sealing ring provided in an embodiment of the present invention;

[0036] Figure 5 This is an exploded view of the conductive core electrode, insulating sleeve, threaded cap, sealing ring, and locking screw provided in the embodiments of the present invention;

[0037] Figure 6 This is a structural schematic diagram of the support member provided in an embodiment of the present invention;

[0038] Figure 7 This is a schematic diagram of the structure of the conductive core electrode provided in an embodiment of the present invention;

[0039] Figure 8 This is a schematic diagram of the structure of the insulating sleeve provided in an embodiment of the present invention;

[0040] Figure 9 This is a schematic diagram of the structure of one end of the deflagration drive section provided in an embodiment of the present invention;

[0041] Figure 10 This is a schematic diagram of the structure of a coaxial cylindrical deflagration drive device for a shock tube / wind tunnel provided in an embodiment of the present invention;

[0042] Figure 11 yes Figure 10 Enlarged view of the structure of the medium-discharge system;

[0043] Figure 12 This is a logic block diagram of a discharge system provided in an embodiment of the present invention;

[0044] Figure 13 This is a schematic diagram of a shock tube / wind tunnel provided in an embodiment of the present invention. Detailed Implementation

[0045] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0046] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0047] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0048] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0049] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0050] Figure 2 This is an assembly diagram of a flexible high-voltage electrode and a deflagration driving section for a coaxial cylindrical deflagration driving device provided by an embodiment of the present invention; Figure 3 yes Figure 2 Cross-sectional view of AA; Figure 4 This is an assembly diagram of the conductive core, insulating sleeve, threaded cap, and sealing ring provided in an embodiment of the present invention; Figure 5 This is an exploded view of the conductive core electrode, insulating sleeve, threaded cap, sealing ring, and locking screw provided in the embodiments of the present invention; Figure 6 This is a structural schematic diagram of the support member provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of the conductive core electrode provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of the insulating sleeve provided in an embodiment of the present invention; Figure 9 This is a structural schematic diagram of one end of the deflagration driving section provided in an embodiment of the present invention; see reference. Figure 2-9 As shown, this embodiment provides a flexible high-voltage electrode for a coaxial cylindrical deflagration drive device, including a conductive core electrode 100, an insulating sleeve 200, a threaded cap 300, a sealing ring 400, and a locking screw 500. The insulating sleeve 200 covers the outer surface of the conductive core electrode 100, and the sealing ring 400 and the threaded cap 300 are both sleeved on the outer surface of the insulating sleeve 200. The conductive core electrode 100 covered with the insulating sleeve 200 is inserted into the deflagration drive section 1 and connected to the deflagration drive section 1 through the threaded cap 300.

[0051] The conductive core 100 includes a first conductive core 101, a second conductive core 102, and a third conductive core 103. One end of the second conductive core 102 is connected to the end of the first conductive core 101 near the second conductive core 102, and the other end is connected to the end of the third conductive core 103 near the second conductive core 102. The end of the first conductive core 101 away from the second conductive core 102 is electrically connected to a high-voltage power supply. The end of the third conductive core 103 away from the second conductive core 102 is connected to a locking screw 500. After the locking screw 500 is tightened to the third conductive core 103, the end of the locking screw 500 away from the second conductive core 102 is flush with the inner wall of the deflagration drive section 1.

[0052] The diameters of the first conductive core portion 101 and the third conductive core portion 103 are both smaller than the diameter of the second conductive core portion 102. The diameter of the first conductive core portion 101 can be the same as the diameter of the third conductive core portion 103.

[0053] The insulating sleeve 200 includes a first covering portion 201 that cooperates with the first conductive core portion 101, a second covering portion 202 that corresponds to the second conductive core portion 102, and a third covering portion 203 that cooperates with the third conductive core portion 103. In the first direction E, the length of the first conductive core portion 101 is a1, the length of the third conductive core portion 103 is a2, the length of the first covering portion 201 is b1, a1>b1, a1>a2, and the first direction E is the direction in which the third conductive core portion 103 points to the first conductive core portion 101.

[0054] The sealing ring 400 is located on the side of the third covering part 203 near the second covering part 202, and the threaded cap 300 is located on the side of the first covering part 201 near the second covering part 202. The second covering part 202 is located between the sealing ring 400 and the threaded cap 300.

[0055] A sealing ring 401 is installed on the contact surface between the sealing ring 400 and the deflagration drive section 1 and the contact surface between the sealing ring 400 and the third covering part 203, respectively;

[0056] It also includes a support member 600, which cooperates with the conductive core electrode 100 covered with an insulating sleeve 200. The support member 600 includes a collar 601 nested in the deflagration drive section 1 and a flexible bracket 602 connected to the collar 601. The flexible bracket 602 includes a first connecting line 6021, a second connecting line 6022, a third connecting line 6023 and a coil 6024. The first connecting line 6021, the second connecting line 6022 and the third connecting line 6023 are connected to the collar 601 at the end near the collar 601, and the first connecting line 6021, the second connecting line 6022 and the third connecting line 6023 are connected to the coil 6024 at the end away from the collar 601. A central hole 6025 is provided on the coil 6024. The ignition wire 13 is led out from the conductive core electrode 100 and passes through the central hole 6025. The central hole 6025 and the axis of the deflagration drive section 1 are located on the same horizontal plane.

[0057] Flexible support 602 is made of polytetrafluoroethylene (PTFE).

[0058] The collar 601 is made of metal.

[0059] Specifically, the flexible high-voltage electrode for the coaxial cylindrical deflagration drive device includes a conductive core electrode 100, an insulating sleeve 200, a threaded cap 300, a sealing ring 400, and a locking screw 500. To ensure the insulation between the deflagration drive section and the conductive core electrode 100, an insulating sleeve 200 is sleeved on the outer surface of the conductive core electrode 100, and a sealing ring 400 and a threaded cap 300 are sleeved on the outer surface of the insulating sleeve 200. To ensure that the flexible high-voltage electrode can be inserted into the deflagration drive section 1, an opening 8 is provided on the deflagration drive section 1 to cooperate with the flexible high-voltage electrode. The conductive core electrode 100 with the insulating sleeve 200 sleeved is inserted into the deflagration drive section 1 through the opening 8 and connected to the deflagration drive section 1 through the threaded cap 300.

[0060] The conductive core 100 has a first conductive core portion 101, a second conductive core portion 102, and a third conductive core portion 103. One end of the second conductive core portion 102 is connected to the end of the first conductive core portion 101 near the second conductive core portion 102, and the other end is connected to the end of the third conductive core portion 103 near the second conductive core portion 102. The end of the first conductive core portion 101 away from the second conductive core portion 102 is electrically connected to a high-voltage power supply. The end of the third conductive core portion 103 away from the second conductive core portion 102 is electrically connected to a high-voltage power supply. A threaded hole 1031 is provided on one side of the conductive core electrode 102. The locking screw 500 is connected to the third conductive core electrode 103 by a thread. After the locking screw 500 is tightened on the third conductive core electrode 103, the end of the locking screw 500 away from the second conductive core electrode 102 is flush with the inner wall of the deflagration driving section 1. In other words, the entire conductive core electrode 100 does not penetrate into the pipe of the deflagration driving section 1, thereby avoiding damage to the entire conductive core electrode 100 due to the impact of the metal diaphragm.

[0061] The diameters of the first conductive core electrode portion 101 and the third conductive core electrode portion 103 are both smaller than the diameter of the second conductive core electrode portion 102. The diameters of the first conductive core electrode portion 101 and the third conductive core electrode portion 103 can be the same. The diameters of the first conductive core electrode portion 101 and the third conductive core electrode portion 103 are both smaller than the diameter of the second conductive core electrode portion 102. In other words, the second conductive core electrode portion 102 is a protruding part, which can prevent the conductive core electrode 100 from flying out under the action of high air pressure. This can be understood as preventing the flexible high-voltage electrode from being pushed out under the high pressure in the deflagration driving section.

[0062] The insulating sleeve 200 has a first covering portion 201 that mates with the first conductive core portion 101, a second covering portion 202 that corresponds to the second conductive core portion 102, and a third covering portion 203 that mates with the third conductive core portion 103. The insulating sleeve 200 is made of radiation-crosslinked polyolefin material. By using radiation-crosslinked polyolefin material for the insulating sleeve 200, it can not only withstand high temperature and high pressure, but also has a certain mechanical strength. Along the first direction E, the length of the first conductive core portion 101 is a1, and the length of the third conductive core portion 103 is a2. The length of the first covering part 201 is b1, and a1 > b1. The length a1 of the first conductive core part 101 is greater than the length b1 of the first covering part 201. That is, the side of the first conductive core part 101 away from the second conductive core part 102 is exposed to facilitate connection to the high-voltage power supply. Of course, in order to improve the convenience of operation, the length a1 of the first conductive core part 101 can be greater than the length a2 of the third conductive core part 103. By a1 > a2, it is convenient for the operator to electrically connect the high-voltage power supply to the first conductive core part 101.

[0063] The sealing ring 400 is located on the side of the third covering part 203 near the second covering part 202, and the threaded cap 300 is located on the side of the first covering part 201 near the second covering part 202. The second covering part 202 is located between the sealing ring 400 and the threaded cap 300. Since the second conductive core electrode part 102 is a protruding part, the second covering part 202 corresponds to the second conductive core electrode part 102. Therefore, the second covering part 202 is also a protruding part. In order to achieve sealing, the sealing ring 400 is sleeved on the side of the third covering part 203 near the second covering part 202. The sealing ring 400 is pressed against the opening 8 of the deflagration drive section 1 by the threaded cap 300.

[0064] Since the deflagration-driven technology requires the generation of high-temperature and high-pressure gas ranging from several megapascals to nearly 100 megapascals within the deflagration-driven section 1, it is essential to ensure the airtightness between the flexible high-voltage electrode and the deflagration-driven section. Sealing rings 401 are installed on the contact surfaces between the sealing ring 400 and the deflagration-driven section, as well as on the contact surfaces between the sealing ring 400 and the third covering part 203. These sealing rings 401 are O-rings. In other words, O-rings are installed on both the contact surfaces between the sealing ring 400 and the insulating sleeve 200, and between the sealing ring 400 and the deflagration-driven section, to ensure the airtightness between the flexible high-voltage electrode and the deflagration-driven section.

[0065] To ensure the coaxiality of the ignition wire 13 within the deflagration drive section 1, a support member 600 is also included. This support member 600 needs to cooperate with the conductive core electrode 100 covered by the insulating sleeve 200. The support member 600 includes a collar 601 and a flexible bracket 602. The flexible bracket 602 is connected inside the collar 601. The collar can be made of any metal material, such as iron, copper, or an alloy, and can be understood as a metal ring nested inside the pipe of the deflagration drive section 1, which can be reused. The flexible bracket 602 includes a first connecting wire 6021, a second connecting wire 6022, a third connecting wire 6023, and a coil 6024. The ends of the first connecting wires 6021, 6022, and 6023 near the collar 601 are fixedly connected to the collar 601, and the ends of the first connecting wires 6021, 6022, and 6023 away from the collar 601 are respectively connected to the coil. 6024 is fixedly connected. The fixed connection can be made by winding, such as winding one end of the first connecting wire 6021, the second connecting wire 6022, and the third connecting wire 6023 together with the collar 601, and winding the other end of the first connecting wire 6021, the second connecting wire 6022, and the third connecting wire 6023 together with the coil 6024. A central hole 6025 is provided on the coil 6024. The ignition wire 13 is led out from the conductive core pole 100 and passes through the central hole 6025. The central hole 6025 and the axis of the deflagration driving section 1 are located on the same horizontal plane. The flexible bracket 602 can be made of polytetrafluoroethylene (PTFE). For example, the first connecting wire 6021, the second connecting wire 6022, the third connecting wire 6023 and the coil 6024 are all made of PTFE. The cost of using PTFE for the flexible bracket 602 is low enough that the flexible bracket 602 can be directly replaced after each experiment.

[0066] In practical use, firstly, the sealing ring 400 is placed against the opening 8 on the deflagration drive section 1, and then the conductive core electrode 100 covered with the insulating sleeve 200 is inserted into the deflagration drive section 1, and mechanical connection is achieved with the deflagration drive section 1 through the threaded cap 300. It should be noted that two insulating sleeves 200 sleeved on the outer surface of the conductive core electrode 100 need to be inserted into the deflagration drive section 1, and the two insulating sleeves 200 sleeved on the outer surface of the conductive core electrode 100 are respectively inserted into both ends of the deflagration drive section 1.

[0067] Secondly, the collar 601 is nested inside the deflagration drive section 1, and the flexible bracket 602 is connected to the collar 601. The center hole 6025 on the flexible bracket 1 is aligned with the axis of the deflagration drive section 1 on the same horizontal plane. One end of the ignition wire 13 is fixed to one side of the conductive core electrode 100 by the locking screw 500. The remaining ignition wires 13 pass through the center holes 6025 on the two flexible brackets 602 in sequence, and the other end of the ignition wire 13 is fixed to the other side of the conductive core electrode 100, so that the ignition wire 13 is in a straight state, thereby ensuring the coaxiality of the ignition wires 13 in the deflagration drive section 1. In addition, the conductive core electrodes 100 at both ends of the deflagration drive section 1 cooperate with the support member 600, and the coaxiality of the ignition wires 13 is ensured by the center hole 6025 on the flexible bracket 602. At the same time, the flexible bracket 602 itself can be directly destroyed when subjected to diaphragm impact. After each experiment, simply replace the collar 601 and the flexible support 602. Since the collar 601 is made of metal, it can be reused. The flexible support 602, made of polytetrafluoroethylene, is inexpensive. Furthermore, since the conductive chip and locking screws do not need to be disassembled when the metal diaphragm is damaged by impact, there is no difficulty in disassembly. Only the support 600 needs to be cleaned.

[0068] As can be seen from the above embodiments, the flexible high-voltage electrode for the coaxial cylindrical deflagration driving device provided by the present invention achieves at least the following beneficial effects:

[0069] First, through the cooperation of the conductive core electrode 100, the locking screw 500 and the support 600, after the locking screw 500 is tightened on the third conductive core electrode 103, the end of the locking screw 500 away from the second conductive core electrode 102 is flush with the inner wall of the deflagration drive section 1, and the central hole 6025 on the coil 6024 is located on the same horizontal plane as the axis of the deflagration drive section 1. This not only avoids the metal diaphragm from directly hitting the conductive core electrode and ensures that the conductive core electrode is not damaged, thereby reducing costs, but also eliminates the need to install and remove the conductive core electrode 100 covered with the insulating sleeve 200 before and after each experiment. It also facilitates the installation or replacement of the ignition wire 13, while ensuring the coaxiality between the ignition wire 13 and the deflagration drive section 1. By using polytetrafluoroethylene material for the flexible bracket 602, the cost of use is effectively reduced.

[0070] Second, by making the diameters of the first conductive core portion 101 and the third conductive core portion 103 smaller than the diameter of the second conductive core portion 102, that is, by making the second conductive core portion 102 a protruding part, it is possible to prevent the conductive core portion 100 from flying out under the action of high air pressure.

[0071] Third, the insulating sleeve 200 wrapped around the outer surface of the conductive core electrode 100 can ensure the insulation between the conductive core electrode 100 and the deflagration driving section, and can withstand high voltage of tens of thousands of volts.

[0072] Fourth, by installing sealing rings 401 on the contact surfaces between the sealing ring 400 and the deflagration drive section and between the sealing ring 400 and the third covering part 203, the airtightness of the insulating sleeve 200 fitted on the outer surface of the conductive core electrode 100 and the deflagration drive section can be guaranteed.

[0073] Optionally, to ensure the stability of the flexible support 602 and to more effectively ensure that the center hole 6025 on the coil 6024 and the axis of the deflagration drive section 1 are on the same horizontal plane, the inner part of the collar 601 is divided into three equal parts to form the first collar division point 6011, the second collar division point 6012, and the third collar division point 6013. The outer part of the coil 6024 is divided into three equal parts to form the first coil division point 6026 corresponding to the first collar division point 6011 and the second collar division point 6023 corresponding to the second collar division point 6011. The second coil division point 6027 corresponds to 12 and the third coil division point 6028 corresponds to the third coil division point 6013; the two ends of the first connecting line 6021 are connected to the first coil division point 6011 and the first coil division point 6026 respectively; the two ends of the second connecting line 6022 are connected to the second coil division point 6012 and the second coil division point 6027 respectively; the two ends of the third connecting line 6023 are connected to the third coil division point 6013 and the third coil division point 6028 respectively.

[0074] In some alternative embodiments, reference continues to be made to Figure 7 and Figure 9 As shown, the diameter of the middle part of the second conductive core electrode 102 is larger than the diameter of both ends of the second conductive core electrode 102, and along the first direction E, the diameter of the middle part of the second conductive core electrode 102 gradually decreases towards both ends. By adopting this scheme, the conductive core electrode 100 can be more effectively prevented from flying out under the action of high voltage.

[0075] In some alternative embodiments, reference continues to be made to Figure 5 , Figure 7 and Figure 9As shown, if the diameter of the conductive core 100 is designed to be less than 5mm, the conductive core 100 will be too thin and lack strength; if the diameter of the conductive core 100 is designed to be greater than 20mm, the conductive core 100 will be too thick and inconvenient to operate. Therefore, the diameter range of the conductive core 100 is 5mm-20mm, which not only improves the strength of the conductive core 100 but also facilitates operation. Since the diameters of the first conductive core portion 101 and the third conductive core portion 103 are both smaller than the diameter of the second conductive core portion 102, the diameter range of the second conductive core portion 102 can be 11-20mm, and the diameter range of the first conductive core portion 101 and the third conductive core portion 103 is 5-10mm. For example, the diameter of the second conductive core portion 102 can be 20mm, and the diameters of the first conductive core portion 101 and the third conductive core portion 103 can both be 10mm.

[0076] As can be seen from the above embodiments, the flexible high-voltage electrode for the coaxial cylindrical deflagration driving device provided by the present invention achieves at least the following beneficial effects:

[0077] First, by cooperating with the conductive core electrode, locking screw, and support, the locking screw is tightened onto the third conductive core electrode. The end of the locking screw away from the second conductive core electrode is flush with the inner wall of the deflagration drive section. Furthermore, the central hole on the coil is located on the same horizontal plane as the axis of the deflagration drive section. This not only prevents the metal diaphragm from directly impacting the conductive core electrode, ensuring that the conductive core electrode is not damaged, thus reducing costs, but also eliminates the need to install and remove the conductive core electrode covered with an insulating sleeve before and after each experiment. It also facilitates the installation or replacement of the ignition wire, while ensuring the coaxiality between the ignition wire and the deflagration drive section. By using polytetrafluoroethylene (PTFE) material for the flexible support, the cost of use is effectively reduced.

[0078] Second, by making the diameters of the first and third conductive core portions smaller than the diameter of the second conductive core portion, that is, by making the second conductive core portion a protruding part, the conductive core portion can be prevented from flying out under high air pressure.

[0079] Third, the insulating sleeve wrapped around the outer surface of the conductive core can ensure the insulation between the conductive core and the deflagration drive section, and can withstand high voltage of tens of thousands of volts.

[0080] Fourth, by installing sealing rings on the contact surfaces between the sealing ring and the deflagration drive section, and on the contact surfaces between the sealing ring and the third covering part, the airtightness of the insulating sleeve fitted on the outer surface of the conductive core and the deflagration drive section can be guaranteed.

[0081] Figure 9 This is a schematic diagram of the structure of one end of the deflagration drive section provided in an embodiment of the present invention; Figure 10This is a schematic diagram of the structure of a coaxial cylindrical deflagration drive device for a shock tube / wind tunnel provided in an embodiment of the present invention; Figure 11 yes Figure 12 Enlarged view of the structure of the intermediate discharge system; Figure 12 This is a logic block diagram of a discharge system provided in an embodiment of the present invention; see also Figure 9-12 As shown, this embodiment also provides a coaxial cylindrical deflagration drive device for shock tubes / wind tunnels, including a deflagration drive section 1 and a driven section 2. One end of the deflagration drive section 1 is connected to the driven section 2, and the other end is connected to a blind plate 14. A diaphragm 5 is provided between the deflagration drive section 1 and the driven section 2. The driven section 2 is connected to the test section 4 through a nozzle 3. The blind plate 14 is a flange cover. By using the blind plate 14 to block the end of the deflagration drive section 1, there is no need to use the traditional detonation unloading section and to provide a diaphragm between the detonation unloading section and the deflagration drive section. This not only helps to reduce the occupied space area, but also reduces the cost.

[0082] A first flexible high-voltage electrode 11 and a second flexible high-voltage electrode 12 extending radially Y are inserted into the deflagration driving section 1. The first flexible high-voltage electrode 11 and the second flexible high-voltage electrode 12 have the same structure, both including the flexible high-voltage electrode for the coaxial cylindrical deflagration driving device provided in this embodiment of the invention. The first flexible high-voltage electrode 11 is located on the side of the deflagration driving section 1 near the blind plate 14, and the second flexible high-voltage electrode 12 is located on the side of the deflagration driving section 1 near the driven section 2. That is, the first flexible high-voltage electrode 11 and the second flexible high-voltage electrode 12 are inserted at both ends of the deflagration driving section 1, and the first flexible high-voltage electrode... The bottom end of the locking screw 500 on the first flexible high-voltage electrode 11 and the second flexible high-voltage electrode 12 is flush with the inner wall of the deflagration driving section; an ignition wire 13 extending along the axial direction is electrically connected between the center hole 6025 of the flexible bracket 602 on the first flexible high-voltage electrode 11 and the center hole 6025 of the flexible bracket 602 on the second flexible high-voltage electrode 12. The axial direction X is the direction from the blind plate 14 to the axis center line of the driven section 2, and the radial direction Y intersects with the axial direction X; optionally, the ignition wire 13 can be any metal material selected from copper, silver, nickel-chromium, tungsten and alloys, and the length of the ignition wire 13 can be adjusted according to the length of the deflagration driving section 1;

[0083] It should be noted that, in order to straighten the ignition wire 13 between the first flexible high-voltage electrode 11 and the second flexible high-voltage electrode 12, the conductive core electrode 100, the locking screw 500, and the center hole 6025 of the flexible bracket 602 on the first flexible high-voltage electrode 11 and the second flexible high-voltage electrode 12 can be used to straighten the ignition wire 13 between the first flexible high-voltage electrode 11 and the second flexible high-voltage electrode 12 along the center line of the detonation drive section axis. Specifically, the center hole 6025 on the flexible bracket 602 near the blind plate 14 and the center hole 6025 on the flexible bracket 602 near the diaphragm 5 are respectively located on the same horizontal plane as the axis of the detonation drive section 1. The ignition wire 13 near the blind plate 14 can be fixed first, and the ignition wire 13 near the blind plate 14 can be straightened. The ignition wire at one end is fixedly connected to the conductive core electrode 100 by the locking screw 500 on the first flexible high voltage electrode 11. After the ignition wire 13 is led out, the ignition wire 13 passes through the center hole 6025 of the flexible support 602 on the first flexible high voltage electrode 11 and the second flexible high voltage electrode 12 in sequence. The end of the ignition wire 13 near the diaphragm 5 is fixedly connected to the conductive core electrode by the locking screw 500 on the second flexible high voltage electrode 12, so that the ignition wire is in a straight state, thereby ensuring the coaxiality of the ignition wire in the deflagration driving section 1. Of course, the ignition wire 13 near the diaphragm 5 can also be fixed first, as long as it can be ensured that the ignition wire 13 set between the first flexible high voltage electrode 11 and the second flexible high voltage electrode 12 is in a straight state and is located at the axial position of the deflagration driving section 1.

[0084] The axial distance from the first flexible high-voltage electrode 11 to the blind plate 14 is L1, and the axial distance from the second flexible high-voltage electrode 12 to the diaphragm 5 is L2. If the lengths of L1 and L2 are less than 0.5cm, breakdown may occur, leading to equipment damage or endangering personnel safety. If the lengths of L1 and L2 are greater than 20cm, the combustion of the combustible mixture in the deflagration drive section 1 may be unstable. Therefore, limiting the lengths of L1 and L2 to 0.5cm-20cm not only allows the ignition wire 13 to be arranged as long as possible along the axial direction in the deflagration drive section, which can further enable more complete combustion of the combustible mixture in the deflagration drive section 1, but also avoids the distance between the first flexible high-voltage electrode 11 and the end of the deflagration drive section and between the second flexible high-voltage electrode 12 and the diaphragm 5 being too close, thereby avoiding breakdown and ensuring the safety of equipment and personnel.

[0085] An opening 8 is provided on the combustion drive section 1 to cooperate with the first flexible high-voltage electrode 11 and the second flexible high-voltage electrode 12. The opening 8 cooperates with the first flexible high-voltage electrode 11 and the second flexible high-voltage electrode 12. The opening 8 facilitates the insertion of the first flexible high-voltage electrode 11 and the second flexible high-voltage electrode 12 into the combustion drive section 1. In order to ensure the airtightness between the first flexible high-voltage electrode 11 and the second flexible high-voltage electrode 12 and the combustion drive section 1, sealing rings 401 are installed on the contact surfaces between the sealing pressure ring 400 in the first flexible high-voltage electrode 11 and the second flexible high-voltage electrode 12 and the combustion drive section 1, as well as the contact surfaces between the sealing pressure ring 400 in the first flexible high-voltage electrode 11 and the third covering part 203 in the first flexible high-voltage electrode 11 and the second flexible high-voltage electrode 12.

[0086] The deflagration drive section 1 is filled with a combustible mixture, which may include fuel, oxidant, and inert gas. The fuel is hydrogen, carbon monoxide, or alkanes, alkenes, and alkynes, or other combustible gases. The oxidant is oxygen or nitrous oxide, or other oxidizing gases. The inert gas is nitrogen, rare gases, or carbon dioxide, or other gases that do not participate in the combustion reaction. The ratio of fuel:oxidant:inert gas can be 1:1:1, 2:1:1, or 2:1:7. Of course, the ratio of fuel, oxidant, and inert gas is set according to the specific equipment and experimental requirements.

[0087] It also includes a discharge system 7, which includes a high-voltage capacitor 71, an ignition switch 720, and an unloading switch 730. The positive terminal of the high-voltage capacitor 71, the ignition switch 720, the first flexible high-voltage electrode 11, the ignition wire 13, the second flexible high-voltage electrode 12, and the negative terminal of the high-voltage capacitor 71 constitute an ignition circuit 72. The positive terminal of the high-voltage capacitor 71, the unloading switch 730, and the negative terminal of the high-voltage capacitor 71 constitute an unloading circuit 73. The ignition circuit 72 and the unloading circuit 73 are connected in parallel. The high-voltage capacitor 71 is used to store high-voltage electricity.

[0088] After the high-voltage capacitor 71 is charged, the ignition switch 720 is closed first. The high-voltage capacitor 71 is connected to the ignition wire 13 through the first flexible high-voltage electrode 11 and the second flexible high-voltage electrode 12 respectively, and ignition begins. After a predetermined time, the unloading switch 730 is closed to short-circuit the positive and negative terminals of the high-voltage capacitor 71. The charge in the high-voltage capacitor 71 is then instantly returned to the high-voltage capacitor 71 through the unloading circuit 73, completing the unloading. The predetermined time can be 5-30 milliseconds.

[0089] The working principle is as follows: Within the deflagration drive section 1, there is an ignition wire 13 arranged axially (X). After the high-voltage capacitor 71 is charged, the ignition switch 720 is closed. The high-voltage capacitor 71 is connected to the ignition wire 13 through the first flexible high-voltage electrode 11 and the second flexible high-voltage electrode 12. A high voltage of several thousand to tens of thousands of volts is applied across the ignition wire 13. At the instant the ignition switch 720 is energized, the ignition wire 13 heats up intensely, igniting the combustible mixture near the ignition wire 13 within microseconds. After ignition, a columnar flame is formed and expands radially. Large; by ensuring that the ignition wire 13 is strictly coaxial with the pipe of the deflagration drive section 1, it is guaranteed that all parts along the axial direction will burn out simultaneously; since the discharge process of the high-voltage capacitor 71 is longer than the combustion process, the remaining charge in the high-voltage capacitor 71 needs to be unloaded before the combustion ends. Therefore, after a predetermined time, the unloading switch 730 is closed to short-circuit the positive and negative terminals of the high-voltage capacitor 71. The charge in the high-voltage capacitor 71 then returns to the high-voltage capacitor 71 instantaneously through the unloading circuit to complete the unloading, thereby preventing the combustion products near the positive terminal of the high-voltage capacitor 71 from breaking down and causing a safety accident.

[0090] It should be noted that: detonation drive requires the formation of a detonation wave propagating along the axial direction within the combustion drive section, while combustion drive involves igniting the gas in the pipeline of combustion drive section 1 along the axial direction simultaneously, completing combustion in a deflagration rather than detonation manner, and ending combustion simultaneously along the axial direction X.

[0091] The effective operating time of a shock tube / wind tunnel is typically in the range of a few milliseconds to 100 milliseconds. In order to provide accurate test conditions, it is essential to ensure that the combustible mixture in the deflagration drive section is ignited and burned out simultaneously.

[0092] As can be seen from the above embodiments, the coaxial cylindrical deflagration drive device for shock tubes / wind tunnels provided by the present invention achieves at least the following beneficial effects:

[0093] First, in the prior art, detonation waves are formed in the combustion driving section by detonation and propagate axially. Since the extremely high pressure peak of the detonation wave cannot be used entirely for driving, the effective pressure provided by detonation driving is much lower than the pressure limit of the equipment. However, in this invention, combustion is used instead of detonation, and there is no pressure peak in detonation. The combustion pressure can be used 100% to compress the test gas, thus increasing the pressure of the test gas.

[0094] Second, the mixture ratio limit of deflagration is much wider than that of detonation, and the temperature and sound speed range of the driving gas are larger, so the total temperature range of the test gas is also larger than that of detonation.

[0095] Third, through the cooperation of the conductive core electrode, locking screw, and support, after the locking screw is tightened on the third conductive core electrode, the end of the locking screw away from the second conductive core electrode is flush with the inner wall of the deflagration drive section. Moreover, the central hole on the coil is located on the same horizontal plane as the axis of the deflagration drive section. This not only avoids the metal diaphragm from directly impacting the conductive core electrode, ensuring that the conductive core electrode is not damaged, thus reducing costs, but also eliminates the need to install and remove the conductive core electrode covered with an insulating sleeve before and after each experiment. It also facilitates the installation or replacement of the ignition wire, while ensuring the coaxiality between the ignition wire and the deflagration drive section. By using polytetrafluoroethylene material for the flexible bracket, the cost of use is effectively reduced.

[0096] The assembly sequence of the coaxial cylindrical deflagration drive device for shock tubes / wind tunnels is as follows:

[0097] Provides deflagration drive section 1;

[0098] First, an opening 8 is provided on the deflagration driving section 1 for placing the first flexible high-voltage electrode 11 and the second flexible high-voltage electrode 12; second, the first flexible high-voltage electrode 11 and the second flexible high-voltage electrode 12 are inserted into the opening 8. The first flexible high-voltage electrode 11 is located on the side of the deflagration driving section near the blind plate 14, and the second flexible high-voltage electrode 12 is located on the side of the deflagration driving section 1 near the driven section 2. The threaded caps 300 on the first flexible high-voltage electrode 11 and the second flexible high-voltage electrode 12 are used to achieve mechanical connection with the deflagration driving section 1; the two ends of the ignition wire 13 are respectively connected to the center holes 1031 on the first flexible high-voltage electrode 11 and the second flexible high-voltage electrode 12.

[0099] A diaphragm is installed between the deflagration driving section 1 and the driven section 2. The driven section 2 is connected to one end of the deflagration driving section 1 near the diaphragm 5, and a blind plate 14 is connected to the other end.

[0100] The combustion-driven section 1 is filled with a combustible mixture;

[0101] Connect the discharge system 7, and form an ignition circuit 72 by connecting the positive terminal of the high-voltage capacitor 71, the ignition switch 720, the first flexible high-voltage electrode 11, the ignition wire 13, the second flexible high-voltage electrode 12, and the negative terminal of the high-voltage capacitor 71; form an unloading circuit 73 by connecting the positive terminal of the high-voltage capacitor 71, the unloading switch 730, and the negative terminal of the high-voltage capacitor 71; the ignition circuit 72 and the unloading circuit 73 are connected in parallel.

[0102] Assemble the coaxial cylindrical deflagration drive device for shock tubes / wind tunnels according to the above assembly sequence. This not only allows for better insertion of the first flexible high-voltage electrode and the second flexible high-voltage electrode, making the position of the ignition wire 13 more precise, but also ensures the airtightness between the first and second flexible high-voltage electrodes and the deflagration drive section, preventing leakage of combustible mixture, ensuring personal safety, and facilitating operation.

[0103] Of course, without considering the discharge of the high-voltage capacitor to the ignition wire, the above assembly sequence can be appropriately adjusted. After installing the driven section 2 or the blind plate 14, the discharge system can be connected first, and then the combustible mixture can be charged into the deflagration drive section 1, as follows:

[0104] First, it provides the deflagration drive segment 1;

[0105] Second, firstly, an opening 8 is provided on the deflagration driving section 1 for placing the first flexible high-voltage electrode 11 and the second flexible high-voltage electrode 12; secondly, the first flexible high-voltage electrode 11 and the second flexible high-voltage electrode 12 are inserted into the opening 8, the first flexible high-voltage electrode 11 is located on the side of the deflagration driving section near the blind plate 14, and the second flexible high-voltage electrode 12 is located on the side of the deflagration driving section 1 near the driven section 2; an ignition wire 13 extending along the axial direction X is connected between the first flexible high-voltage electrode 11 and the second flexible high-voltage electrode 12.

[0106] Third, a diaphragm is installed between the deflagration driving section 1 and the driven section 2. The driven section 2 is connected to one end of the deflagration driving section 1 near the diaphragm 5, and a blind plate 14 is connected to the other end.

[0107] Fourth, connect the discharge system 7, and form an ignition circuit 72 by connecting the positive terminal of the high-voltage capacitor 71, the ignition switch 720, the first flexible high-voltage electrode 11, the ignition wire 13, the second flexible high-voltage electrode 12, and the negative terminal of the high-voltage capacitor 71; form an unloading circuit 73 by connecting the positive terminal of the high-voltage capacitor 71, the unloading switch 730, and the negative terminal of the high-voltage capacitor 71; the ignition circuit 72 and the unloading circuit 73 are connected in parallel.

[0108] Fifth, the combustion-driven section 1 is filled with a combustible mixture.

[0109] It should be noted that: First, a deflagration driving section 1 is provided; second, firstly, an opening 8 is provided on the deflagration driving section 1 for placing a first flexible high-voltage electrode 11 and a second flexible high-voltage electrode 12; secondly, the first flexible high-voltage electrode 11 and the second flexible high-voltage electrode 12 are inserted into the opening 8, with the first flexible high-voltage electrode 11 located on the side of the deflagration driving section near the blind plate 14, and the second flexible high-voltage electrode 12 located on the side of the deflagration driving section 1 near the driven section 2; an ignition wire 13 extending along the axial direction X is connected between the flexible support 602 on the first flexible high-voltage electrode 11 and the flexible support 602 on the second flexible high-voltage electrode 12; thirdly, a diaphragm is installed between the deflagration driving section 1 and the driven section 2, with the driven section 2 connected to one end of the deflagration driving section 1 near the diaphragm 5, and the blind plate 14 connected to the other end; the assembly sequence of the above three steps is irreversible, that is, the assembly sequence cannot be reversed, otherwise it cannot be implemented.

[0110] Figure 13This is a schematic diagram of a shock tube / wind tunnel provided in an embodiment of the present invention; another embodiment of the present invention provides a shock tube / wind tunnel, including a coaxial cylindrical deflagration drive device for a shock tube / wind tunnel provided in an embodiment of the present invention.

[0111] While specific embodiments of the invention have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of the invention. Those skilled in the art should understand 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 flexible high-voltage electrode for a coaxial cylindrical deflagration driving device, characterized in that: The device includes a conductive core electrode, an insulating sleeve, a threaded cap, a sealing ring, and a locking screw. The insulating sleeve covers the outer surface of the conductive core electrode, and the sealing ring and the threaded cap are both sleeved on the outer surface of the insulating sleeve. The conductive core electrode covered with the insulating sleeve is inserted into the deflagration drive section and connected to the deflagration drive section through the threaded cap. The conductive core includes a first conductive core portion, a second conductive core portion, and a third conductive core portion. One end of the second conductive core portion is connected to the end of the first conductive core portion near the second conductive core portion, and the other end is connected to the end of the third conductive core portion near the second conductive core portion. The end of the first conductive core portion away from the second conductive core portion is electrically connected to a high-voltage power supply. The end of the third conductive core portion away from the second conductive core portion is connected to the locking screw. After the locking screw is tightened to the third conductive core portion, the end of the locking screw away from the second conductive core portion is flush with the inner wall of the deflagration drive section. The diameters of the first conductive core portion and the third conductive core portion are both smaller than the diameter of the second conductive core portion; The insulating sleeve includes a first covering portion that cooperates with the first conductive core electrode portion, a second covering portion that corresponds to the second conductive core electrode portion, and a third covering portion that cooperates with the third conductive core electrode portion. In the first direction, the length of the first conductive core electrode portion is a1, the length of the third conductive core electrode portion is a2, the length of the first covering portion is b1, a1>b1, a1>a2, and the first direction is the direction in which the third conductive core electrode portion points to the first conductive core electrode portion. The sealing ring is located on the side of the third covering portion closer to the second covering portion, the threaded cap is located on the side of the first covering portion closer to the second covering portion, and the second covering portion is located between the sealing ring and the threaded cap; The contact surfaces between the sealing pressure ring and the deflagration drive section, and between the sealing pressure ring and the third covering part, are respectively equipped with sealing rings; It also includes a support member that cooperates with the conductive core electrode covered by the insulating sleeve. The support member includes a collar nested in the deflagration drive section and a flexible bracket connected to the collar. The flexible bracket includes a first connecting wire, a second connecting wire, a third connecting wire, and a coil. The first connecting wire, the second connecting wire, and the third connecting wire are connected to the collar at their ends near the collar, and the first connecting wire, the second connecting wire, and the third connecting wire are connected to the coil at their ends away from the collar. The coil has a central hole, and the ignition wire is led out from the conductive core electrode and passes through the central hole. The central hole and the axis of the deflagration drive section are located on the same horizontal plane. The flexible support is made of polytetrafluoroethylene. The collar is made of metal.

2. The flexible high-voltage electrode for a coaxial cylindrical deflagration driving device according to claim 1, characterized in that, After dividing the inner part of the collar into three equal parts, a first collar division point, a second collar division point, and a third collar division point are formed. After dividing the outer part of the coil into three equal parts, a first coil division point corresponding to the first collar division point, a second coil division point corresponding to the second collar division point, and a third coil division point corresponding to the third collar division point are formed. The first connecting line connects to the first loop division point and the first coil division point at both ends, the second connecting line connects to the second loop division point and the second coil division point at both ends, and the third connecting line connects to the third loop division point and the third coil division point at both ends.

3. The flexible high-voltage electrode for a coaxial cylindrical deflagration driving device according to claim 1, characterized in that, The diameter of the middle part of the second conductive core electrode is larger than the diameter of both ends of the second conductive core electrode, and the diameter of the middle part of the second conductive core electrode gradually decreases towards both ends along the first direction.

4. The flexible high-voltage electrode for a coaxial cylindrical deflagration driving device according to claim 1, characterized in that, The insulating sleeve is made of radiation-crosslinked polyolefin material.

5. The flexible high-voltage electrode for a coaxial cylindrical deflagration driving device according to any one of claims 1-4, characterized in that, The diameter of the conductive core electrode is 5mm-20mm.

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