Elastic bending high voltage electrode for coaxial cylindrical deflagration drive device

Abstract

The present invention discloses an elastic bending high-voltage electrode for a coaxial cylindrical deflagration drive device, comprising a conductive core, an insulating sleeve, a threaded pressure cap, and a sealing pressure ring; the conductive core comprises a first conductive core portion, a second conductive core portion, and a third conductive core portion; the third conductive core portion is provided with a center hole on a side away from the second conductive core portion, the ignition wire passes through the center hole, and the center hole and the axis of the deflagration drive section are located on the same horizontal plane; an elastic member is provided on the third conductive core portion, the elastic member has a first elastic portion and a second elastic portion, and a gap is provided between the second elastic portion and the third conductive core portion; a groove is provided on a side away from the second conductive core portion, and the groove corresponds to the center hole, and the bottom surface of the groove is close to one side of the third conductive core portion; the insulating sleeve has a first covering portion, a second covering portion, and a third covering portion. The present invention is not only convenient for installing or replacing the ignition wire, but also can ensure that the ignition wire is precisely coaxial with the deflagration drive section 1.

Description

Technical Field

[0001] The present invention relates to the technical field of experimental research on high-temperature and high-speed gas dynamics, high-speed aircraft, etc., and more specifically, to an elastically curved high-voltage electrode for a coaxial cylindrical deflagration-driven shock tube / wind tunnel. Background Art

[0002] Shock tube / wind tunnel is a kind of experimental equipment widely used in the fields of high-temperature and high-speed gas dynamics, high-speed aircraft, etc. The basic principle is: high-pressure driving gas compresses low-pressure test gas through shock waves to achieve the required test state. Figure 1 As shown, a typical shock tube / wind tunnel includes a driving section 1', a driven section 2', a nozzle 3' and a test section 4'; before the test, the driving section 1' and the driven section 2' are separated by a diaphragm 5', the driving section 1' is filled with high-pressure driving gas, and the driven section 2' is filled with low-pressure test gas; during the test, the diaphragm 5' ruptures, the high-pressure gas expands and enters the driven section 2', and a fast-moving shock wave is generated in the driven section 2'; if the gas after the shock wave is directly used to carry out the test, the equipment operates in the shock tube mode; if the test is carried out using the test gas accelerated by the nozzle 3', the equipment operates in the shock wind tunnel mode.

[0003] The total temperature and total pressure range of the test gas are the main indicators for measuring the equipment's capabilities, and both depend on the driving capacity of the high-pressure driving gas. Normal temperature and high-pressure gas can no longer meet the increasingly demanding test requirements. For this reason, three high-performance driving technologies have been developed at home and abroad: piston drive, heated light gas drive, and detonation drive. Among them, the detonation drive technology has the characteristics of low cost, simple structure and relatively safe, 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 of the 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 of the Chinese Academy of Sciences developed the JF-10 detonation-driven high-enthalpy shock tunnel [see Yu Hongru, Zhao Wei, and Yuan Shengxue's Performance of Hydrogen-Oxygen Detonation-Driven Shock Tunnels - Aerodynamic Test 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 the Aachen University of Technology in Germany in 1993. In 1994, NASA modified the original free piston driven design and built a forward detonation driven high enthalpy shock tunnel (HYPULSE) at GASL. The tunnel can operate in both reflected shock tunnel mode and expansion tube mode [see Chue RSM, Tsai CY, Bakos RJ, Erdos JI, Rogers RC (2002) NASA's HYPULSE Facility at GASL-ADual 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 drive requires the formation of a detonation wave that propagates axially within the drive section. The uneven flow field behind the detonation wave causes the following problems in this drive technology: first, the range of gas mixture ratios that can detonate is much narrower than the range that can deflagrate, and the temperature and sound velocity ranges of the driving gas are also correspondingly narrower, thus limiting the total temperature range of the test gas that can be provided by the detonation drive; second, the effective driving pressure provided by the detonation drive does not exceed 40% of the pressure limit of the equipment, limiting the total pressure range of the test gas.

[0006] Since the above-mentioned problems exist in detonation drive, it is necessary to overcome the above-mentioned problems and introduce coaxial cylindrical deflagration drive technology. However, the coaxial cylindrical deflagration drive technology requires high-voltage electrodes to be plugged into both ends of the drive section, and an ignition wire is arranged between the two high-voltage electrodes along the center line of the drive section axis. However, the high-voltage electrode still needs to meet the following requirements: (1) The deflagration drive technology requires the generation of high-temperature and high-pressure combustion gas of several megapascals to nearly 100 megapascals in the drive section pipeline, and the sealing of the electrode and the tube body must be ensured; at the same time, the electrode and the tube body must be insulated and withstand high voltage electricity of tens of thousands of volts; (2) In order to ensure the precise coaxiality of the ignition wire and the drive section pipeline, 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 rebounds after rupture, it is also necessary to avoid damage to the electrode caused by the high-speed impact of the metal diaphragm. In response to the above requirements, ordinary high-voltage electrodes include a conductive core electrode, on the outer surface of which is covered with an insulating layer. When the conductive chip is installed on the device, a thread is sleeved on the outer surface of the insulating layer for easy fastening to fasten it to the device. However, this cannot meet the requirements of the 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 seat. There is a cable copper core in the middle of the rod body, and the outer periphery of the copper core is wrapped with a cable insulation layer. The exposed portion of the lower end of the cable copper core is covered with a screw plug, and the end caps sealed with threads are covered on the outer ends of the screw plug and the rod body. A conical locking bolt and a locking nut for locking the cable are provided on the upper part of the coupling seat. The rod body is increased from the original 450mm to about 600mm, but the 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, the shock tunnel having a detonation drive section, one end of the detonation drive section is provided with a detonation discharge section, and the other end is provided with a driven section; a first diaphragm is provided between the detonation discharge 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 at a section of the detonation drive section close to the detonation discharge section, and a reverse detonation drive ignition device is provided at a section of the detonation drive section close to the driven section; a controllable time-delay trigger device is connected between the forward detonation drive ignition device and the reverse detonation drive ignition device, and the method is as follows: Below: 1) A forward detonation ignition device is arranged at one end of the detonation driving section of the shock tunnel close to the detonation unloading section, and a reverse detonation driving ignition device is arranged at one end of the detonation driving section close to the driven section; 2) Ignition is performed by the forward detonation ignition device to form a forward driven detonation wave; 3) After the forward detonation wave propagates along the detonation driving section for a predetermined time, ignition is performed by the reverse detonation driving ignition device to form a reverse driven detonation wave; 4) The reverse driven detonation wave tears the diaphragm arranged between the driven section and the detonation driving section, and a moving shock wave is formed after the forward detonation wave intersects with the reverse detonation wave, and the moving shock wave enters the driven section to compress the test gas in the driven section.

[0009] In order to meet the needs of coaxial cylindrical deflagration driving technology, the present invention proposes an elastically curved high-voltage electrode for a coaxial cylindrical deflagration driving device, and the elastically curved high-voltage electrode for a coaxial cylindrical deflagration driving device is not easily conceived by technical personnel in this field. Summary of the invention

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

[0011] The conductive core comprises 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 an end of the first conductive core portion close to the second conductive core portion, and the other end is connected to an end of the third conductive core portion close to the second conductive core portion, and an end of the first conductive core portion away from the second conductive core portion is electrically connected to a high voltage power supply;

[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] A central hole is formed on a side of the third conductive core portion away from the second conductive core portion, and an ignition wire passes through the central hole. The central hole and the axis of the deflagration driving section are located on the same horizontal plane;

[0014] An elastic member is provided on the side of the third conductive core portion away from the second conductive core portion, the elastic member has a first elastic portion and a second elastic portion connected to the first elastic portion, the first elastic portion is located on the side close to the second conductive core portion, the second elastic portion is located on the side away from the second conductive core portion, the first elastic portion is connected to the third conductive core portion, and a gap is provided between the second elastic portion and the third conductive core portion; a groove is provided on the side of the second elastic portion away from the second conductive core portion, and the groove corresponds to the center hole, and the bottom surface of the groove is close to one side of the third conductive core portion;

[0015] The insulating sleeve has a first covering portion matched with the first conductive core portion, a second covering portion corresponding to the second conductive core portion, and a third covering portion matched with the third conductive core portion, wherein along the first direction, the length of the first conductive core portion is a1, the length of the third conductive core portion is a2, the length of the first covering portion is b1, the length of the third covering portion is b2, a1>b1, a2>b2, and the first direction is the direction in which the first conductive core portion points to the third conductive core portion;

[0016] The sealing pressure ring is located on a side of the third covering portion close to the second covering portion, the threaded pressure cap is located on a side of the first covering portion close to the second covering portion, and the second covering portion is located between the sealing pressure ring and the threaded pressure cap;

[0017] The contact surface between the sealing pressure ring and the deflagration driving section and the contact surface between the sealing pressure ring and the third covering portion are respectively installed with sealing rings.

[0018] Optionally, along the second direction, the gap between the second elastic portion away from one end of the second conductive core pole portion and the third conductive core pole portion is larger than the gap between the second elastic portion and the third conductive core pole portion close to one end of the second conductive core pole portion, wherein the second direction is perpendicular to the first direction.

[0019] Optionally, the second elastic portion includes a first elastic segment and a second elastic segment connected to the first elastic segment, the first elastic segment is close to one side of the first elastic portion, and the second elastic segment is away from one side of the first elastic portion, the groove is located in the second elastic segment, and along the second direction, the gap between the first elastic segment and the third conductive core pole portion gradually increases.

[0020] Optionally, a diameter of a middle portion of the second conductive core portion is larger than a diameter of two ends of the second conductive core portion, and along the first direction, the diameter of the middle portion of the second conductive core portion gradually decreases toward two ends.

[0021] Optionally, the insulating sleeve is made of radiation cross-linked polyolefin material.

[0022] Optionally, the diameter of the conductive core electrode is 5 mm-20 mm.

[0023] Compared with the prior art, the elastically curved high-voltage electrode for a coaxial cylindrical deflagration drive device provided by the present invention achieves at least the following beneficial effects:

[0024] First, through the center hole on the third conductive core pole portion, the center hole and the axis of the deflagration driving section are located on the same horizontal plane, and the center hole on the third conductive core pole portion cooperates with the elastic member on the third conductive core pole portion, which not only facilitates the installation or replacement of the ignition wire, but also ensures that the ignition wire and the deflagration driving section 1 are precisely coaxial;

[0025] Second, by making the diameters of the first conductive core portion and the third conductive core portion smaller than the diameter of the second conductive core portion, that is, the second conductive core portion is a protruding portion, the conductive core can be prevented from flying out under the action of high voltage;

[0026] Third, the conductive core electrode wrapped with an insulating sleeve can ensure the insulation between the conductive core electrode and the deflagration drive section, and can withstand high voltage electricity of tens of thousands of volts;

[0027] Fourth, the sealing rings installed on the contact surface between the sealing pressure ring and the deflagration driving section and the contact surface between the sealing pressure ring and the third covering portion can ensure the airtightness of the insulating sleeve sleeved on the outer surface of the conductive core electrode 100 and the deflagration driving section.

[0028] Of course, any product implementing the present invention does not necessarily need to achieve all of the above technical effects at the same time.

[0029] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0031] Figure 1 It is a schematic diagram of the structure of a shock tube / wind tunnel provided in the prior art;

[0032] Figure 2It is a schematic structural diagram of an elastically curved high-voltage electrode for a coaxial cylindrical deflagration driving device provided by an embodiment of the present invention;

[0033] Figure 3 It is an exploded view of an elastically curved high-voltage electrode for a coaxial cylindrical deflagration driving device provided by an embodiment of the present invention;

[0034] Figure 4 is a cross-sectional view of an elastically curved high-voltage electrode for a coaxial cylindrical deflagration driving device provided by an embodiment of the present invention;

[0035] Figure 5 is a schematic structural diagram of an elastic member provided by an embodiment of the present invention;

[0036] Figure 6 is a schematic structural diagram of a conductive core electrode provided by an embodiment of the present invention;

[0037] Figure 7 is a schematic structural diagram of an insulating sleeve provided by an embodiment of the present invention;

[0038] Figure 8 is a schematic structural diagram of one end portion of a deflagration driving section provided by an embodiment of the present invention;

[0039] Fig. 9 It is a schematic structural diagram of a coaxial cylindrical deflagration drive device for a shock tube / wind tunnel provided by an embodiment of the present invention;

[0040] Fig.10 yes Fig. 9 A magnified diagram of the structure of the discharge system;

[0041] Fig.11 is a logic block diagram of a discharge system provided by an embodiment of the present invention;

[0042] Fig.12 It is a schematic diagram of the structure of a shock tube / wind tunnel provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0043] 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 components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0044] 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.

[0045] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0046] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0047] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0048] Figure 2 It is a schematic structural diagram of an elastically curved high-voltage electrode for a coaxial cylindrical deflagration driving device provided by an embodiment of the present invention; Figure 3 It is an exploded view of an elastically curved high-voltage electrode for a coaxial cylindrical deflagration driving device provided by an embodiment of the present invention; Figure 4 is a cross-sectional view of an elastically curved high-voltage electrode for a coaxial cylindrical deflagration driving device provided by an embodiment of the present invention; Figure 5 is a schematic structural diagram of an elastic member provided by an embodiment of the present invention; Figure 6 is a schematic structural diagram of a conductive core electrode provided by an embodiment of the present invention; Figure 7 is a schematic structural diagram of an insulating sleeve provided by an embodiment of the present invention; Figure 8 is a schematic diagram of the structure of one end of the deflagration driving section provided by an embodiment of the present invention; Figure 1-8 As shown, this embodiment provides an elastically bent high-voltage electrode 1000 for a coaxial cylindrical deflagration drive device, comprising a conductive core electrode 100, an insulating sleeve 200, a threaded pressure cap 300, and a sealing pressure ring 400, wherein the insulating sleeve 200 is coated on the outer surface of the conductive core electrode 100, the sealing pressure ring 400 and the threaded pressure cap 300 are both sleeved on the outer surface of the insulating sleeve 200, and the conductive core electrode 100 coated with the insulating sleeve 200 is plugged into the deflagration drive section 1, and is connected to the deflagration drive section 1 through the threaded pressure cap 300;

[0049] The conductive core 100 includes 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 an end of the first conductive core portion 101 close to the second conductive core portion 102, and the other end is connected to an end of the third conductive core portion 103 close to the second conductive core portion 102, and an 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;

[0050] 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 ;

[0051] A central hole 1031 is formed on one side of the third conductive core portion 103 away from the second conductive core portion 102, and the ignition wire passes through the central hole 1031. The central hole 1031 and the axis of the deflagration driving section are located on the same horizontal plane;

[0052] An elastic member 500 is provided on the side of the third conductive core pole portion 103 away from the second conductive core pole portion 102, and the elastic member 500 has a first elastic portion 501 and a second elastic portion 502 connected to the first elastic portion 501, the first elastic portion 501 is located on the side close to the second conductive core pole portion 102, the second elastic portion 502 is located on the side away from the second conductive core pole portion 102, the first elastic portion 501 is connected to the third conductive core pole portion 103, and a gap 503 is provided between the second elastic portion 502 and the third conductive core pole portion 103; a groove 504 is provided on the side of the second elastic portion 502 away from the second conductive core pole portion, and the groove 504 corresponds to the center hole 1031, and the bottom surface of the groove 504 is close to the side of the third conductive core pole portion 103;

[0053] The insulating sleeve 200 has a first covering portion 201 matched with the first conductive core portion 101, a second covering portion 202 corresponding to the second conductive core portion 102, and a third covering portion 203 matched with the third conductive core portion 103, wherein along 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, the length of the third covering portion 203 is b2, a1>b1, a2>b2, and the first direction E is the direction from the first conductive core portion 101 to the third conductive core portion 103;

[0054] The sealing ring 400 is located on the side of the third covering portion 203 close to the second covering portion 202, the threaded pressing cap 300 is located on the side of the first covering portion 201 close to the second covering portion 202, and the second covering portion 202 is located between the sealing ring 400 and the threaded pressing cap 300;

[0055] The contact surface between the sealing pressure ring 400 and the deflagration driving section 1 and the contact surface between the sealing pressure ring 400 and the third covering portion 203 are respectively installed with sealing rings 401 .

[0056] Specifically, the elastically bent high-voltage electrode 1000 for the coaxial cylindrical deflagration driving device comprises a conductive core electrode 100, an insulating sleeve 200, a threaded pressure cap 300, a sealing pressure ring 400, and an elastic member 500. In order to ensure the insulation between the deflagration driving section and the conductive core electrode 100, the insulating sleeve 200 is sleeved on the outer surface of the conductive core electrode 100, and the sealing pressure ring 400 and the threaded pressure cap 300 are sleeved on the outer surface of the insulating sleeve 200. In order to ensure that the elastically bent high-voltage electrode is plugged into the deflagration driving section 1, an opening 8 matching the elastically bent high-voltage electrode is opened on the deflagration driving section 1, and the conductive core electrode 100 sleeved with the insulating sleeve 200 is plugged into the deflagration driving section through the opening 8, and is connected to the deflagration driving section 1 through the threaded pressure cap 300;

[0057] The conductive core 100 includes 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 an end of the first conductive core portion 101 close to the second conductive core portion 102, and the other end is connected to an end of the third conductive core portion 103 close to the second conductive core portion 102, and an 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;

[0058] 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 and the diameter of the third conductive core portion 103 can be the same. 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. That is, the second conductive core portion 102 is a protruding portion, which can prevent the conductive core 100 from flying out under the action of high gas pressure. It can be understood that in order to prevent the elastic curved high-voltage electrode from being pushed out when the pressure in the deflagration driving section is high;

[0059] A central hole 1031 is formed on one side of the third conductive core portion 103 away from the second conductive core portion 102, and the ignition wire can pass through the central hole 1031. The central hole 1031 and the axis of the deflagration driving section are located on the same horizontal plane;

[0060] An elastic member 500 is provided on the third conductive core pole portion 103, and the elastic member 500 is located on a side away from the second conductive core pole portion 102. The elastic member 500 can be a spring sheet or a strip-shaped elastic member. The elastic member 500 has a first elastic portion 501 and a second elastic portion 502. The first elastic portion 501 is connected to an end of the first elastic portion 501 away from the second conductive core pole portion 102 and an end of the second elastic portion 502 close to the second conductive core pole portion 102. The first elastic portion 501 is located on a side close to the second conductive core pole portion 102, and the second elastic portion 502 is located on a side away from the second conductive core pole portion 102. The first elastic portion 501 is fixedly connected to the third conductive core pole portion 103, and a gap 503 is provided between the second elastic portion 502 and the third conductive core pole portion 103. That is to say, the first elastic part 501 is fitted with the third conductive core pole part 103 and fixedly connected. The fixed connection method here can be welding or bonding, as long as the first elastic part 501 can be fixedly connected to the third conductive core pole part 103, and there is a distance between the second elastic part 502 and the third conductive core pole part 103; in order to facilitate the winding of the ignition wire, a groove 504 is provided on the side of the second elastic part 502 away from the second conductive core pole part, and the groove 504 corresponds to the center hole 1031. In order to avoid the ignition wire from slipping when it is wound on the groove 504 of the second elastic part 502, the shape of the groove 504 can be designed to be V-shaped, and the bottom surface of the groove 504 is close to the side of the third conductive core pole part 103;

[0061] The insulating sleeve 200 has a first covering portion 201 matched with the first conductive core portion 101, a second covering portion 202 corresponding to the second conductive core portion 102, and a third covering portion 203 matched with the third conductive core portion 103. The insulating sleeve 200 is made of radiation cross-linked polyolefin material. By using the radiation cross-linked polyolefin material in the insulating sleeve 200, it can not only withstand high temperature and high pressure, but also has a certain mechanical strength; wherein, along 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, and the length of the third covering portion 203 is b2, a1>b1, a2>b2, and the length a1 of the first conductive core portion 101 is greater than the first The length b1 of the covering portion 201, that is, the first conductive core portion 101 is exposed away from the second conductive core portion 102, which is convenient for connecting the high-voltage power supply, and the third conductive core portion 103 is also exposed away from the second conductive core portion 102, which is convenient for installing the ignition wire. Specifically, it is convenient to pass one side of the ignition wire through the central hole 1031 and wrap it around the second elastic portion 502; it can be understood that the two ends of the conductive core 100 do not need to be covered with the insulating sleeve 200; of course, in order to improve the convenience of operation, the length of the first conductive core portion 101 can be a1 greater than the length of the third conductive core portion 103 a2, and by a1>a2, it is convenient for the operator to electrically connect the high-voltage power supply to the first conductive core portion 101;

[0062] The sealing pressure ring 400 is located on the side of the third covering part 203 close to the second covering part 202, the threaded pressure cap 300 is located on the side of the first covering part 201 close to the second covering part 202, and the second covering part 202 is located between the sealing pressure ring 400 and the threaded pressure cap 300. Since the second conductive core pole part 102 is a protruding part, the second covering part 202 corresponds to the second conductive core pole part 102, and therefore the second covering part 202 is also a protruding part. In order to achieve sealing, the sealing pressure ring 400 is sleeved on the side of the third covering part 203 close to the second covering part 202, and the sealing pressure ring 400 is abutted against the opening 8 of the deflagration driving section 1 through the threaded pressure cap 300;

[0063] Since the deflagration driving technology needs to generate high-temperature and high-pressure combustion gas of several MPa to nearly 100 MPa in the deflagration driving section 1, the sealing between the elastically curved high-voltage electrode and the deflagration driving section must be ensured, and sealing rings 401 are respectively installed on the contact surface between the sealing pressure ring 400 and the deflagration driving section and the contact surface between the sealing pressure ring 400 and the third covering portion 203. The sealing ring 401 is an O-ring, that is, O-rings are installed on the contact surface between the sealing pressure ring 400 and the insulating sleeve 200 and the contact surface between the sealing pressure ring 400 and the deflagration driving section to ensure the airtightness between the elastically curved high-voltage electrode and the deflagration driving section.

[0064] When used specifically, first, the sealing pressure ring 400 is abutted against the opening 8 on the deflagration driving section 1, and then the conductive core electrode 100 covered with the insulating sleeve 200 is inserted into the deflagration driving section 1, and a mechanical connection is achieved with the deflagration driving section 1 through the threaded pressure 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 on the deflagration driving section 1, and the two insulating sleeves 200 sleeved on the outer surface of the conductive core electrode 100 are respectively inserted at both ends of the deflagration driving section 1;

[0065] Secondly, since the conductive core pole 100 covered with the insulating sleeve 200 is respectively inserted at both ends of the deflagration driving section 1, the center hole 1031 on the third conductive core pole portion 103 is located on the axis of the deflagration driving section 1, and the ignition wire passes through the center hole 1031, and the second elastic portion 502 is first pressed to fit with the third conductive core pole portion 103, and then the ignition wire is passed around the groove 504 on the second elastic portion 502; and fixed on the third conductive core pole portion 103, after loosening the second elastic portion 502, the elastic force of the second elastic portion 502 itself is used to straighten the ignition wire. It should be noted that: the ignition wire can be wrapped around the groove 504 for several times and then fixed; the use of the elastic member 500 makes the installation of the ignition wire more convenient, which is suitable for situations where the required tightening force is smaller, such as when the ignition wire is softer and shorter.

[0066] It can be seen from the above embodiments that the elastically curved high-voltage electrode 1000 for the coaxial cylindrical deflagration driving device provided by the present invention achieves at least the following beneficial effects:

[0067] First, through the center hole 1031 on the third conductive core pole portion 103, the center hole 1031 and the axis of the deflagration driving section are located on the same horizontal plane, and the center hole 1031 on the third conductive core pole portion 103 cooperates with the elastic member 500 on the third conductive core pole portion 103, which not only facilitates the installation or replacement of the ignition wire, but also ensures that the ignition wire and the deflagration driving section 1 are precisely coaxial;

[0068] 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, the second conductive core portion 102 is a protruding portion, the conductive core 100 can be prevented from flying out under the action of high voltage;

[0069] Third, the conductive core electrode 100 wrapped with the insulating sleeve 200 can ensure the insulation between the conductive core electrode 100 and the deflagration driving section, and can withstand high voltage electricity of tens of thousands of volts;

[0070] Fourth, by installing sealing rings 401 on the contact surface between the sealing pressure ring 400 and the deflagration drive section and on the contact surface between the sealing pressure ring 400 and the third covering portion 203, the airtightness of the insulating sleeve 200 sleeved on the outer surface of the conductive core pole 100 and the deflagration drive section can be ensured.

[0071] In some optional embodiments, continue to refer to Figure 2 and Figure 4-5 As shown, along the second direction F, the gap d1 between the second elastic portion 502 away from one end of the second conductive core pole portion 102 and the third conductive core pole portion 103 is greater than the gap d2 between the second elastic portion 502 and the third conductive core pole portion 103 close to one end of the second conductive core pole portion 102, wherein the second direction F is perpendicular to the first direction E; by d1>d2, it is more conducive to keeping the ignition wire in a straight state through the elastic force of the elastic member 500 itself; optionally, the second elastic portion 502 includes a first elastic segment 5021 and a second elastic segment 5022 connected to the first elastic segment 5021, the first elastic segment 5021 is close to one side of the first elastic portion 501, the second elastic segment 5022 is away from one side of the first elastic portion 501, the groove 504 is located in the second elastic segment 5022, and along the second direction F, the gap between the first elastic segment 5021 and the third conductive core pole portion gradually increases.

[0072] In some optional embodiments, continue to refer to Figure 6 As shown, the diameter of the middle part of the second conductive core pole portion 102 is larger than the diameter of the two ends of the second conductive core pole portion 102, and along the first direction E, the middle part of the second conductive core pole portion 102 gradually decreases toward the two ends. By adopting this solution, the conductive core pole 100 can be more effectively prevented from flying out under the action of high air pressure.

[0073] In some optional embodiments, continue to refer to Figure 5 , Figure 7 and Figure 6As shown, if the diameter of the conductive core electrode 100 is designed to be less than 5 mm, the conductive core electrode 100 is too thin and the strength is insufficient; if the diameter of the conductive core electrode 100 is designed to be greater than 20 mm, the conductive core electrode 100 is too thick and inconvenient to operate. Therefore, the diameter range of the conductive core electrode 100 is 5 mm-20 mm, which can not only improve the strength of the conductive core electrode 100, thereby effectively avoiding damage to the conductive core electrode 100 caused by the high-speed impact of the metal diaphragm, but also facilitate operation. Since 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 diameter range of the second conductive core electrode portion 102 can be 11-20 mm, and the diameter range of the first conductive core electrode portion 101 and the third conductive core electrode portion 103 are both 5-10 mm. For example, the diameter of the second conductive core electrode portion 102 can be 20 mm, and the diameters of the first conductive core electrode portion 101 and the third conductive core electrode portion 103 are both 10 mm.

[0074] It can be seen from the above embodiments that the elastically curved high-voltage electrode for the coaxial cylindrical deflagration driving device provided by the present invention achieves at least the following beneficial effects:

[0075] The central hole on the third conductive core pole portion is located on the same horizontal plane as the axis of the deflagration driving section, and the central hole is matched with the elastic member, which not only facilitates the installation or replacement of the ignition wire, but also ensures that the ignition wire and the deflagration driving section are precisely coaxial;

[0076] Second, by making the diameters of the first conductive core portion and the third conductive core portion smaller than the diameter of the second conductive core portion, that is, the second conductive core portion is a protruding portion, the conductive core can be prevented from flying out under the action of high gas pressure;

[0077] Third, the insulation 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;

[0078] Fourth, by installing sealing rings on the contact surface between the sealing pressure ring and the deflagration drive section and the contact surface between the sealing pressure ring and the third covering portion, the airtightness of the insulating sleeve sleeved on the outer surface of the conductive core and the deflagration drive section can be ensured.

[0079] Figure 8 is a schematic structural diagram of one end portion of a deflagration driving section provided by an embodiment of the present invention; Fig. 9 It is a schematic structural diagram of a coaxial cylindrical deflagration drive device for a shock tube / wind tunnel provided by an embodiment of the present invention; Fig.10 yes Fig. 9 A magnified diagram of the structure of the discharge system; Fig.11 is a logic block diagram of a discharge system provided by an embodiment of the present invention; see Figure 8-11As shown, this embodiment also provides a coaxial cylindrical deflagration driving device for a shock tube / wind tunnel, comprising a deflagration driving section 1, a driven section 2, a diaphragm 5 for separating the deflagration driving section 1 from the driven section 2, a blind plate 14, and a discharge system 7, wherein one end of the deflagration driving section 1 is connected to the driven section 2, and the other end is connected to the blind plate 14;

[0080] The deflagration driving section 1 is a straight tube of equal cross-section, and a first elastic curved high-voltage electrode 11 and a second elastic curved high-voltage electrode 12 extending along a radial direction Y are plugged into the deflagration driving section 1, the first elastic curved high-voltage electrode 11 is located on the side of the deflagration driving section close to the blind plate 14, and the second elastic curved high-voltage electrode 12 is located on the side of the deflagration driving section 1 close to the driven section 2, and an ignition wire 13 extending along an axial direction X is electrically connected between the first elastic curved high-voltage electrode 11 and the second elastic curved high-voltage electrode 12, and the axial direction X is the direction of the axial centerline from the deflagration driving section 1 to the driven section 2, and the radial direction Y intersects with the axial direction X;

[0081] Along the axial direction X, the length between the first elastic bending high-voltage electrode 11 and the blind plate 14 is L1, and the length between the second elastic bending high-voltage electrode 12 and the diaphragm 5 is L2. The lengths of L1 and L2 are limited to 0.5 cm-20 cm;

[0082] The deflagration driving section 1 is provided with an opening 8 which matches with the first elastic bending type high voltage electrode 11 and the second elastic bending type high voltage electrode 12;

[0083] The deflagration driving section 1 is filled with a combustible mixed gas;

[0084] The discharge system 7 includes a high-voltage capacitor 71, an ignition switch 720 and a unloading switch 730. The high-voltage capacitor 71 can generate a high voltage of 2000V. The ignition circuit 72 is composed of the positive electrode of the high-voltage capacitor 71, the ignition switch 720, the first elastic curved high-voltage electrode 11, the ignition wire 13, the second elastic curved high-voltage electrode 12, and the negative electrode of the high-voltage capacitor 71; the unloading circuit 73 is composed of the positive electrode of the high-voltage capacitor 71, the unloading switch 730 and the negative electrode of the high-voltage capacitor 71; the ignition circuit 72 is connected in parallel with the unloading circuit 73, and the high-voltage capacitor 71 is used to store high voltage electricity and discharge it to the ignition wire.

[0085] Specifically, the coaxial cylindrical deflagration driving device for shock tube / wind tunnel comprises a deflagration driving section 1 and a driven section 2, one end of the deflagration driving section 1 is connected to the driven section 2, and the other end is connected to a blind plate 14, a diaphragm 5 is arranged between the deflagration driving section 1 and the driven section 2, the driven section 2 is connected to a test section 4 through a nozzle 3, the blind plate 14 is a flange cover, and the end of the deflagration driving section 1 is blocked by the blind plate 14, and there is no need to use a traditional explosion unloading section and to arrange a diaphragm between the explosion unloading section and the deflagration driving section, which is not only conducive to reducing the occupied space area, but also can reduce the cost;

[0086] A first elastically curved high-voltage electrode 11 and a second elastically curved high-voltage electrode 12 extending along a radial direction Y are inserted into the deflagration driving section 1. The first elastically curved high-voltage electrode 11 and the second elastically curved high-voltage electrode 12 have the same structure and both include an elastically curved high-voltage electrode for a coaxial cylindrical deflagration driving device provided by an embodiment of the present invention. The first elastically curved high-voltage electrode 11 is located on the side of the deflagration driving section 1 close to the blind plate 14, and the second elastically curved high-voltage electrode 12 is located on the side of the deflagration driving section 1 close to the driven section 2. That is to say, the first elastically curved high-voltage electrode 11 and the second elastically curved high-voltage electrode 12 are located on the side of the deflagration driving section 1 close to the driven section 2. The electrode 11 and the second elastic curved high-voltage electrode 12 are plugged into the two ends of the deflagration driving section 1; an ignition wire 13 extending in the axial direction is electrically connected between the center hole 1031 on the first elastic curved high-voltage electrode 11 and the center hole 1031 on the second elastic curved high-voltage electrode 12, and the axial direction X is the direction from the blind plate 14 to the axial 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 made of 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;

[0087] It should be noted that in order to straighten the ignition wire 13 between the first elastic curved high-voltage electrode 11 and the second elastic curved high-voltage electrode 12, the center hole 1031 on the first elastic curved high-voltage electrode 11 and the second elastic curved high-voltage electrode 12 and the elastic member 500 connected to the third conductive core pole portion 103 can be used to cooperate with each other to straighten the ignition wire 13 between the first elastic curved high-voltage electrode 11 and the second elastic curved high-voltage electrode 12 along the axial center line of the deflagration driving section; specifically, the center hole 1031 on the third conductive core pole portion 103 is located on the axis of the deflagration driving section 1, one end of the ignition wire passes through the center hole 1031 and is then wrapped around the elastic member 500 near the blind plate 14 and fixed, and the second elastic portion 502 near the blind plate 14 can be pressed to fit the third conductive core pole portion 103. The ignition wire is closed so that it bypasses the groove 504 on the second elastic part 502; and is fixed on the third conductive core pole part 103, and then the second elastic part 502 close to the side of the diaphragm 5 is pressed to fit with the third conductive core pole part 103, so that the ignition wire bypasses the groove 504 on the second elastic part 502. After loosening the second elastic part 502, the elastic force of the second elastic part 502 itself is used to straighten the ignition wire. The above operation can be performed by two people in collaboration. Of course, it can also be performed by one person. When one person operates it, first fix the end of the ignition wire on one side, and then use the elastic member 500 to cooperate with the center hole 1031 on the first elastic curved high-voltage electrode 11 and the second elastic curved high-voltage electrode 12 to straighten the ignition wire arranged between the first elastic curved high-voltage electrode 11 and the second elastic curved high-voltage electrode 12.

[0088] The axial distance from the first elastically curved high-voltage electrode 11 to the blind plate 14 is L1, and the axial distance from the second elastically curved high-voltage electrode 12 to the diaphragm 5 is L2. If the lengths of L1 and L2 are less than 0.5 cm, breakdown may occur, resulting in equipment damage or endangering personnel safety; if the lengths of L1 and L2 are greater than 20 cm, it may cause unstable combustion of the combustible mixture in the deflagration driving section 1. Therefore, the lengths of L1 and L2 are limited to 0.5 cm-20 cm, which not only makes the ignition wire 13 as long as possible in the axial direction in the deflagration driving section, which can further make the combustible mixture in the deflagration driving section 1 burn more fully, but also avoids the distance between the first elastically curved high-voltage electrode 11 and the end of the deflagration driving section and between the second elastically curved high-voltage electrode 12 and the diaphragm 5 being too close, thereby avoiding breakdown and ensuring the safety of equipment and personnel;

[0089] An opening 8 is provided on the deflagration driving section 1 to match the first elastic curved high-voltage electrode 11 and the second elastic curved high-voltage electrode 12. The opening 8 matches the first elastic curved high-voltage electrode 11, and the second elastic curved high-voltage electrode 12 matches the opening 8. The first elastic curved high-voltage electrode 11 and the second elastic curved high-voltage electrode 12 are conveniently plugged into the deflagration driving section 1 through the opening 8. In order to ensure the airtightness between the first elastic curved high-voltage electrode 11 and the second elastic curved high-voltage electrode 12 and the deflagration driving section 1, respectively, the contact surface between the sealing pressure ring 400 in the first elastic curved high-voltage electrode 11 and the second elastic curved high-voltage electrode 12 and the deflagration driving section, and the contact surface between the sealing pressure ring 400 in the first elastic curved high-voltage electrode 11 and the second elastic curved high-voltage electrode 12 and the third covering portion 203 in the first elastic curved high-voltage electrode 11 and the second elastic curved high-voltage electrode 12 are respectively installed with a sealing ring 401;

[0090] The deflagration driving section 1 is filled with a combustible mixed gas, which may include a fuel, an oxidant and an inert gas, wherein 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, a rare gas or carbon dioxide, or other gases that do not participate in the combustion reaction; the ratio of fuel: oxidant: inert gas may be 1:1:1, the ratio of fuel: oxidant: inert gas may be 2:1:1, and the ratio of fuel: oxidant: inert gas may be 2:1:7. Of course, the ratio of fuel, oxidant and inert gas is set according to the specific equipment and experimental requirements;

[0091] The discharge system 7 includes a high-voltage capacitor 71, an ignition switch 720 and a discharge switch 730. The positive electrode of the high-voltage capacitor 71, the ignition switch 720, the first elastically curved high-voltage electrode 11, the ignition wire 13, the second elastically curved high-voltage electrode 12 and the negative electrode of the high-voltage capacitor 71 constitute an ignition circuit 72; the positive electrode of the high-voltage capacitor 71, the discharge switch 730 and the negative electrode of the high-voltage capacitor 71 constitute a discharge circuit 73. The ignition circuit 72 and the discharge circuit 73 are connected in parallel. The high-voltage capacitor 71 is used to store high voltage electricity.

[0092] After the high-voltage capacitor 71 is charged, the ignition switch 720 is closed first, and the high-voltage capacitor 71 is connected to the ignition wire 13 through the first elastic curved high-voltage electrode 11 and the second elastic curved 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 poles of the high-voltage capacitor 71, and the charge in the high-voltage capacitor 71 is instantly returned to the high-voltage capacitor 71 through the unloading circuit 73 to complete the unloading. The above-mentioned predetermined time can be 5-30 milliseconds.

[0093] The working principle is as follows: there is an ignition wire 13 arranged along the axial direction X in the deflagration driving section 1. 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 elastic curved high-voltage electrode 11 and the second elastic curved high-voltage electrode 12 respectively. A high voltage of thousands to tens of thousands of volts is applied to both ends of the ignition wire 13. At the moment when the ignition switch 720 is powered on, the ignition wire 13 heats up violently, igniting the combustible mixed gas near the ignition wire 13 within microseconds. After ignition, a columnar flame surface is formed and burns along the Radial expansion; by making the ignition wire 13 strictly coaxial with the pipeline of the deflagration drive section 1, it is ensured that all parts along the axial direction are burned out simultaneously; because the discharge process of the high-voltage capacitor 71 is longer than the combustion process, it is necessary to remove the remaining charge in the high-voltage capacitor 71 before the end of combustion. Therefore, after a predetermined time, the unloading switch 730 is closed to short-circuit the positive and negative poles of the high-voltage capacitor 71. The charge in the high-voltage capacitor 71 is instantly returned to the high-voltage capacitor 71 through the unloading circuit to complete the unloading, thereby preventing the combustion products from breaking down near the positive pole of the high-voltage capacitor 71 and causing a safety accident.

[0094] It should be noted that: detonation drive requires the formation of a detonation wave that propagates axially in the deflagration drive section, while deflagration drive causes the gas in the pipeline of the deflagration drive section 1 to ignite simultaneously along the axial direction, complete combustion in a deflagration rather than a detonation manner, and terminate combustion simultaneously along the axial direction X.

[0095] Usually the effective working time of a shock tube / wind tunnel is roughly in the order of a few milliseconds to 100 milliseconds. In order to provide accurate test conditions, it is necessary to strictly ensure that the combustible mixture in the deflagration driving section is ignited and burned out at the same time.

[0096] It can be seen from the above embodiments that the coaxial cylindrical deflagration drive device for shock tube / wind tunnel provided by the present invention achieves at least the following beneficial effects:

[0097] First, in the prior art, a detonation wave propagating in the axial direction is formed in the deflagration driving section by detonation driving. Since the extremely high pressure peak of the detonation wave cannot be fully used for driving, the effective pressure provided by the detonation driving is much lower than the pressure limit of the equipment. In the present invention, deflagration replaces detonation, and there is no pressure peak in detonation. The combustion pressure can be 100% used to compress the test gas, thereby increasing the pressure of the test gas.

[0098] 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 is larger. Therefore, the corresponding total temperature range of the test gas is also larger than that of detonation drive.

[0099] Third, the center hole 1031 on the first elastic curved high-voltage electrode 11 and the second elastic curved high-voltage electrode 12 and the groove 504 on the elastic member 500 cooperate with each other, which can not only ensure that the ignition wire of seven to ten meters long is straightened on the first elastic curved high-voltage electrode 11 and the second elastic curved high-voltage electrode 12, but also facilitate the installation of the ignition wire 13;

[0100] Fourth, through the center hole 1031 on the third conductive core pole portion 103 in the first elastic curved high-voltage electrode 11 and the second elastic curved high-voltage electrode, and the center hole 1031 and the axis of the deflagration driving segment are located on the same horizontal plane, it can ensure that the ignition wire 13 and the deflagration driving segment 1 are precisely coaxial.

[0101] The assembly sequence of the coaxial cylindrical deflagration drive for shock tube / wind tunnel is as follows:

[0102] First, providing a deflagration drive section 1;

[0103] Second, first, an opening 8 for placing the first elastic curved high-voltage electrode 11 and the second elastic curved high-voltage electrode 12 is opened on the deflagration driving section 1; secondly, the first elastic curved high-voltage electrode 11 and the second elastic curved high-voltage electrode 12 are inserted into the opening 8, the first elastic curved high-voltage electrode 11 is located on the side of the deflagration driving section close to the blind plate 14, and the second elastic curved high-voltage electrode 12 is located on the side of the deflagration driving section 1 close to the driven section 2, and the threaded pressure caps 300 on the first elastic curved high-voltage electrode 11 and the second elastic curved 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 elastic curved high-voltage electrode 11 and the second elastic curved high-voltage electrode 12;

[0104] Third, a diaphragm is installed between the deflagration driving section 1 and the driven section 2, and the driven section 2 is connected to one end of the deflagration driving section 1 close to the diaphragm 5, and the other end is connected to a blind plate 14;

[0105] Fourth, the deflagration driving section 1 is filled with a combustible mixed gas;

[0106] Fifth, connect the discharge system 7, and the positive electrode of the high-voltage capacitor 71, the ignition switch 720, the first elastic curved high-voltage electrode 11, the ignition wire 13, the second elastic curved high-voltage electrode 12, and the negative electrode of the high-voltage capacitor 71 constitute an ignition circuit 72; the positive electrode of the high-voltage capacitor 71, the unloading switch 730 and the negative electrode of the high-voltage capacitor 71 constitute an unloading circuit 73; the ignition circuit 72 and the unloading circuit 73 are connected in parallel.

[0107] Assembling the coaxial cylindrical deflagration drive device for shock tube / wind tunnel according to the above-mentioned assembly sequence can not only better plug the first elastic curved high-voltage electrode and the second elastic curved high-voltage electrode, making the position of the ignition wire 13 more accurately arranged, but also ensure the airtightness between the first elastic curved high-voltage electrode and the second elastic curved high-voltage electrode and the deflagration drive section, avoid leakage of combustible mixed gas, ensure personal safety, and facilitate operation.

[0108] 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 driving section 1, as follows:

[0109] First, providing a deflagration drive section 1;

[0110] Second, first, an opening 8 for placing a first elastically curved high-voltage electrode 11 and a second elastically curved high-voltage electrode 12 is provided on the deflagration driving section 1; secondly, the first elastically curved high-voltage electrode 11 and the second elastically curved high-voltage electrode 12 are inserted into the opening 8, the first elastically curved high-voltage electrode 11 is located on the side of the deflagration driving section close to the blind plate 14, and the second elastically curved high-voltage electrode 12 is located on the side of the deflagration driving section 1 close to the driven section 2; an ignition wire 13 extending along the axial direction X is connected between the first elastically curved high-voltage electrode 11 and the second elastically curved high-voltage electrode 12;

[0111] Third, a diaphragm is installed between the deflagration driving section 1 and the driven section 2, and the driven section 2 is connected to one end of the deflagration driving section 1 close to the diaphragm 5, and the other end is connected to a blind plate 14;

[0112] Fourth, connect the discharge system 7, and form an ignition circuit 72 with the positive electrode of the high-voltage capacitor 71, the ignition switch 720, the first elastically curved high-voltage electrode 11, the ignition wire 13, the second elastically curved high-voltage electrode 12, and the negative electrode of the high-voltage capacitor 71; form an unloading circuit 73 with the positive electrode of the high-voltage capacitor 71, the unloading switch 730, and the negative electrode of the high-voltage capacitor 71; and connect the ignition circuit 72 and the unloading circuit 73 in parallel;

[0113] Fifth, the combustible mixed gas is filled in the deflagration driving section 1.

[0114] It should be noted that: first, a deflagration driving section 1 is provided; second, first, an opening 8 for placing a first elastic curved high-voltage electrode 11 and a second elastic curved high-voltage electrode 12 is opened on the deflagration driving section 1; secondly, the first elastic curved high-voltage electrode 11 and the second elastic curved high-voltage electrode 12 are inserted into the opening 8, the first elastic curved high-voltage electrode 11 is located on the side of the deflagration driving section close to the blind plate 14, and the second elastic curved high-voltage electrode 12 is located on the side of the deflagration driving section 1 close to the driven section 2; an ignition wire 13 extending along the axial direction X is connected between the first elastic curved high-voltage electrode 11 and the second elastic curved high-voltage electrode 12; third, a diaphragm is installed between the deflagration driving section 1 and the driven section 2, and the driven section 2 is connected to one end of the deflagration driving section 1 close to the diaphragm 5, and the other end is connected to the blind plate 14; the assembly sequence of the above three steps is irreversible, that is, the above assembly sequence cannot be reversed, and it cannot be implemented after reversal.

[0115] Fig.12 It is a schematic diagram of the structure of a shock tube / wind tunnel provided in an embodiment of the present invention; the embodiment of the present invention also 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.

[0116] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. An elastically curved high-voltage electrode for a coaxial cylindrical deflagration drive device, characterized in that: It includes a conductive core, an insulating sleeve, a threaded pressure cap, and a sealing pressure ring, wherein the insulating sleeve is coated on the outer surface of the conductive core, the sealing pressure ring and the threaded pressure cap are both sleeved on the outer surface of the insulating sleeve, and the conductive core coated with the insulating sleeve is plugged into the deflagration driving section and connected to the deflagration driving section through the threaded pressure cap; The conductive core comprises 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 an end of the first conductive core portion close to the second conductive core portion, and the other end is connected to an end of the third conductive core portion close to the second conductive core portion, and an end of the first conductive core portion away from the second conductive core portion is electrically connected to a high voltage power supply; 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; A central hole is formed on a side of the third conductive core portion away from the second conductive core portion, and an ignition wire passes through the central hole. The central hole and the axis of the deflagration driving section are located on the same horizontal plane; An elastic member is provided on the side of the third conductive core portion away from the second conductive core portion, the elastic member has a first elastic portion and a second elastic portion connected to the first elastic portion, the first elastic portion is located on the side close to the second conductive core portion, the second elastic portion is located on the side away from the second conductive core portion, the first elastic portion is connected to the third conductive core portion, and a gap is provided between the second elastic portion and the third conductive core portion; a groove is provided on the side of the second elastic portion away from the second conductive core portion, and the groove corresponds to the center hole, and the bottom surface of the groove is close to one side of the third conductive core portion; The insulating sleeve has a first covering portion matched with the first conductive core portion, a second covering portion corresponding to the second conductive core portion, and a third covering portion matched with the third conductive core portion, wherein along the first direction, the length of the first conductive core portion is a1, the length of the third conductive core portion is a2, the length of the first covering portion is b1, the length of the third covering portion is b2, a1>b1, a2>b2, and the first direction is the direction in which the first conductive core portion points to the third conductive core portion; The sealing pressure ring is located on a side of the third covering portion close to the second covering portion, the threaded pressure cap is located on a side of the first covering portion close to the second covering portion, and the second covering portion is located between the sealing pressure ring and the threaded pressure cap; The contact surface between the sealing pressure ring and the deflagration driving section and the contact surface between the sealing pressure ring and the third covering portion are respectively installed with sealing rings.

2. The elastically curved high-voltage electrode for a coaxial cylindrical deflagration drive device according to claim 1, characterized in that: Along the second direction, the gap between the second elastic portion away from one end of the second conductive core pole portion and the third conductive core pole portion is larger than the gap between the second elastic portion and the third conductive core pole portion close to one end of the second conductive core pole portion, wherein the second direction is perpendicular to the first direction.

3. The elastically curved high-voltage electrode for a coaxial cylindrical deflagration driving device according to claim 2, characterized in that: The second elastic portion includes a first elastic segment and a second elastic segment connected to the first elastic segment, the first elastic segment is close to one side of the first elastic portion, and the second elastic segment is away from one side of the first elastic portion. The groove is located in the second elastic segment, and along the second direction, the gap between the first elastic segment and the third conductive core pole portion gradually increases.

4. The elastically curved high-voltage electrode for a coaxial cylindrical deflagration driving device according to claim 1, characterized in that: The diameter of the middle portion of the second conductive core portion is greater than the diameter of the two ends of the second conductive core portion, and along the first direction, the diameter of the middle portion of the second conductive core portion gradually decreases toward the two ends.

5. The elastically curved high-voltage electrode for a coaxial cylindrical deflagration driving device according to claim 1, characterized in that: The insulating sleeve is made of radiation cross-linked polyolefin material.

6. The elastically curved high-voltage electrode for a coaxial cylindrical deflagration drive device according to any one of claims 1 to 5, characterized in that: The diameter of the conductive core electrode is 5mm-20mm.

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