Light gas gun flying fragment pressurization device and method

Abstract

The present invention discloses a light gas gun flyer pressurization device and method, which relates to the fields of impact dynamics and shock wave physics. The device comprises a light gas gun, a detonation driver, flyers, and a target plate. The target plate is arranged at the right end of the detonation driver, and the detonation driver is arranged at the right end of the light gas gun. Flyers are arranged at the end of the light gas gun, between the detonation driver and the target plate. The flyers include a first-stage flyer, a gradient flyer, and a second-stage flyer. The centers of the second-stage flyer, the gradient flyer, and the first-stage flyer are located at the same horizontal height. The present invention adopts the above-mentioned light gas gun flyer pressurization device and method. Based on the impact loading platform of light gas guns such as first-stage gas guns, second-stage gas guns, and hydrogen-oxygen guns, the device and method can significantly increase the speed and impact pressure of the target by adding a detonation driver and gradient flyers to the tail section of the launch tube without changing the structure and launch process of the light gas gun. Compared with a three-stage gun, the experimental cost can be significantly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of shock dynamics and shock wave physics, and in particular to a light gas gun flying fragment pressurization device and method. Background Art

[0002] The physical and chemical properties of materials under high temperature and pressure are currently hot topics in cutting-edge research, encompassing topics such as synthesis, decomposition, phase transitions, activation, and superconductivity. Currently, dynamic high-pressure devices such as light gas guns, chemical explosive loading devices, and magnetic drive loading devices can be used to study experimental samples through high-pressure environments generated by high-speed collisions. A first-stage light gas gun typically achieves shock pressures of over ten gigapascals, while a second-stage light gas gun and chemical explosive loading devices can achieve shock pressures exceeding tens or even hundreds of gigapascals. Traditional chemical explosive experimental devices require explosive plane wave generators and high-energy explosives to drive flyers. However, due to the high risk and limited scope of use of high-energy explosives, their widespread adoption is difficult. Furthermore, the heterogeneity of high-energy explosives makes it difficult to control the planarity of the detonation products. Consequently, deformation often occurs during the driving of flyers, resulting in poor planarity of the one-dimensional planar shock wave generated upon impact. A second-stage light gas gun, powered by high-pressure gas or hydrogen-oxygen detonation, can achieve shock pressures exceeding hundreds of gigapascals and is currently the most widely used type of dynamic high-pressure shock loading device. Based on the two-stage light gas gun launch technology, an extension tube is added to the rear end of the launch tube to drive the two flyers, further increasing the collision speed and impact pressure. This is the so-called three-stage light gas gun launch technology. However, the high cost of three-stage light gas gun launch technology has not yet been widely adopted. The cost of generating impact pressure with a magnetically driven loading device increases exponentially, and the mass and diameter of the driven flyers are also limited.

[0003] In view of this, for experimenters involved in the fields of shock dynamics and shock wave physics, how to use light gas guns to achieve faster shock loading speeds and higher shock loading pressures has become an important technical issue that they urgently want to solve. Summary of the Invention

[0004] The purpose of the present invention is to provide a light gas gun flying fragment pressurization device and method to improve the existing light gas gun impact pressure.

[0005] To achieve the above-mentioned objectives, the present invention provides a light gas gun flyer pressurizing device, comprising a light gas gun, a detonation driver, flyers and a target plate, wherein the target plate is arranged at the right end of the detonation driver, and the detonation driver is arranged at the right end of the light gas gun. Flyers are arranged at the end of the light gas gun and between the detonation driver and the target plate. The flyers include a first-stage flyer, a gradient flyer and a second-stage flyer, and the centers of the second-stage flyer, the gradient flyer and the first-stage flyer are located at the same horizontal height.

[0006] Preferably, the first-stage flyer is bonded to the end of the buttress, the center of the front end surface of the buttress coincides with the center of the first-stage flyer, the buttress is launched by the light gas gun, and the buttress is made of polycarbonate.

[0007] Preferably, the detonation driver comprises a metal bin, an end of the metal bin is provided with a metal outer edge, a metal groove is provided on the metal outer edge, the metal groove is connected to a cover plate, and the cover plate is made of organic glass.

[0008] Preferably, the metal chamber is filled with a propellant, the propellant is nitromethane, the nitromethane liquid level is flush with the metal groove, and the purity of the nitromethane is not less than 99.5%.

[0009] Preferably, the gradient flyer is made of a material with varying wave impedance, the inner layer material is a low wave impedance material, the middle material is a medium wave impedance material, and the outer layer material is a high wave impedance material. The diameter of the gradient flyer is the same as the inner diameter of the detonation driver.

[0010] Preferably, the secondary flyer is made of metal material, and the upper and lower surfaces are finely polished with a flatness of not less than 0.02 mm. The diameter of the secondary flyer is slightly smaller than the diameter of the gradient flyer.

[0011] Preferably, the first-level flying plate is made of oxygen-free copper, has a thickness of 2 mm, a diameter of 32 mm, and a flatness of the upper and lower surfaces better than 0.02 mm.

[0012] A method for using a light gas gun flying fragment boosting device comprises the following steps:

[0013] Step 1: Assemble the detonation driver. Inject the propellant into the metal chamber, install the cover into the metal groove, and seal the joints between the cover and the metal groove with epoxy resin. Cover the cover with a heavy object and wait for the epoxy resin to completely cure.

[0014] Step 2: Use epoxy resin to bond the first-stage flyer to the front end of the cartridge case.

[0015] Step 3: The light gas gun drives the sabot and the first-stage flying piece to impact the detonation driver with a flat plate;

[0016] Step 4: The detonation driver generates a detonation to drive the gradient flying piece, which drives the secondary flying piece to collide with the target plate to generate ultra-high impact pressure, thereby achieving the effect of light gas gun flying piece pressurization.

[0017] Preferably, in step three, the light gas gun drives the sabot and the first-stage flyer to perform a flat plate impact on the detonation driver, and the impact pressure generated by the flat plate impact is not lower than the impact detonation pressure of the detonation driver.

[0018] Preferably, the inclination angle at which the first-stage flying pieces in step three impact the detonation driver is less than 0.5°.

[0019] Therefore, the present invention utilizes the aforementioned light gas gun flyer supercharging device and method. Based on the impact loading platform of light gas guns such as first-stage gas guns, second-stage gas guns, and hydrogen-oxygen guns, the device and method significantly increase the speed and impact pressure of the target impact by adding a detonation driver and gradient flyers to the tail section of the launch tube without changing the light gas gun structure or launch process. This significantly reduces experimental costs compared to three-stage guns. Nitromethane is used as a propellant. Nitromethane is more readily available than high-energy explosives. Nitromethane is a liquid, eliminating the need for die-casting or melt-casting processes, resulting in greater versatility and applicability. As a liquid, nitromethane is more uniform than high-energy explosives, resulting in a higher-quality one-dimensional shock wave generated by detonation, which can better drive the gradient flyers to impact the second-stage flyers, achieving quasi-isentropic loading of the second-stage flyers.

[0020] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the principle of the light gas gun flying piece pressurization method of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of the detonation driver of the present invention;

[0023] Figure 3 Schematic diagram of the gradient flyer structure of the present invention;

[0024] Reference numerals

[0025] 101. Light gas gun; 102. Sabot; 103. First-stage flyer; 104. Detonation driver; 105. Gradient flyer; 106. Second-stage flyer; 107. Target plate; 401. Metal chamber; 402. Cover; 403. Metal outer edge; 404. Metal groove; 405. Nitromethane; 501. Porous plexiglass; 502. Plexiglas; 503. Aluminum; 504. Aluminum-copper alloy; 505. Copper. DETAILED DESCRIPTION

[0026] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0027] Unless otherwise defined, the technical or scientific terms used in the present invention shall have the usual meanings understood by persons of ordinary skill in the field to which the present invention belongs. The words "first", "second" and similar terms used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0028] Example

[0029] See also Figure 1-3 The present invention provides a light gas gun flyer pressurizing device, comprising a light gas gun 101, a detonation driver 104, flyers and a target plate 107. The target plate 107 is arranged at the right end of the detonation driver 104. The detonation driver 104 is arranged at the right end of the light gas gun 101. Flyers are arranged at the end of the light gas gun 101 and between the detonation driver 104 and the target plate 107. The flyers include a first-level flyer 103, a gradient flyer 105 and a second-level flyer 106. The centers of the first-level flyer 103, the gradient flyer 105 and the second-level flyer 106 are located at the same horizontal height, ensuring that the entire light gas gun flyer pressurizing process is carried out in a vacuum environment of 100 Pa.

[0030] The first-stage flyer 103 is bonded to the end of the cartridge case 102, and the center of the front end surface of the cartridge case 102 coincides with the center of the first-stage flyer 103. The cartridge case 102 is launched by a light gas gun 101. The cartridge case 102 is made of polycarbonate material with a diameter of 34.95 mm. The first-stage flyer 103 is made of oxygen-free copper with a thickness of 2 mm and a diameter of 32 mm. The flatness of the upper and lower surfaces is better than 0.02 mm. The first-stage flyer 103 is bonded to the front end surface of the cartridge case 102 using epoxy resin. The launch can only be carried out after the epoxy resin is completely solidified.

[0031] The detonation driver includes a metal chamber 401, with a metal outer edge 403 at its end. Metal grooves 404 are formed in this outer edge 403, connecting to a cover plate 402. Cover plate 402 is made of organic glass, with a diameter of 38 mm and a thickness of 2 mm. Metal chamber 401 is made of oxygen-free copper, with a wall thickness of 1.5 mm and an inner diameter of 32 mm. It has the same diameter as the first-stage flyer 103. Metal outer edge 403 has a diameter of 40 mm, and is machined into a metal groove 404. This groove has a diameter of 38 mm and a depth of 0.5 mm.

[0032] Metal chamber 401 is filled with a propellant, nitromethane 405, whose liquid level is flush with metal groove 404. The purity of nitromethane 405 is no less than 99.5%. Metal chamber 401 is placed on a platform with its opening facing upward. The propellant is injected into metal chamber 401 until the liquid level of nitromethane 405 is flush with metal groove 404. Cover plate 402 is then installed into metal groove 404. Epoxy resin is then applied to the joints between the sides of cover plate 402 and metal groove 404. A heavy object is placed on top of cover plate 402, and the epoxy resin is allowed to fully cure.

[0033] Gradient flyer plate 105 is made of materials with varying wave impedances: an inner layer of low-wave impedance, a middle layer of medium-wave impedance, and an outer layer of high-wave impedance. The diameter of gradient flyer plate 105 is the same as the inner diameter of detonation driver 104. Gradient flyer plate 105 is composed of porous organic glass 501, organic glass 502, aluminum 503, aluminum-copper alloy 504, and copper 505. The porous organic glass 501 has a porosity of 50% and pores less than 10 μm in diameter. The aluminum-copper alloy 504 contains 50% aluminum. Aluminum 503, aluminum-copper alloy 504, and copper 505 are sintered together using hot pressing and then bonded to porous organic glass 501 and organic glass 502 to form gradient flyer plate 105. Gradient flyer plate 105 has a diameter of 32 mm and a thickness of 3 mm, with each layer 0.6 mm thick.

[0034] The secondary flyer 106 is made of oxygen-free copper, and the upper and lower surfaces are finely polished with a flatness of not less than 0.02 mm. The diameter of the secondary flyer 106 is slightly smaller than the diameter of the gradient flyer 105.

[0035] A method for using a light gas gun flying fragment boosting device comprises the following steps:

[0036] Step 1: Assemble the detonation driver 104. Inject the propellant into the metal chamber 401. Install the cover plate 402 into the metal groove 404. Use epoxy resin to seal the joint between the side of the cover plate 402 and the metal groove 404. Cover the cover plate 402 with a heavy object and wait for the epoxy resin to completely cure.

[0037] Step 2: Use epoxy resin to bond the first-stage flyer 103 to the front end of the cartridge case 102;

[0038] Step 3: The light gas gun 101 drives the sabot 102 and the first-stage flyer 103 to perform a flat plate impact on the detonation driver 104. The impact pressure generated by the flat plate impact is not less than the impact detonation pressure of the detonation driver 104. The inclination angle of the first-stage flyer 103 when impacting the detonation driver 104 is less than 0.5°.

[0039] Step 4: The detonation driver 104 detonates to drive the gradient flyer 105 , and the gradient flyer 105 drives the secondary flyer 106 to collide with the target plate 107 to generate ultra-high impact pressure, thereby achieving the effect of light gas gun flyer pressurization.

[0040] Therefore, the present invention utilizes the aforementioned light gas gun flyer supercharging device and method. Based on the impact loading platform of light gas guns such as first-stage gas guns, second-stage gas guns, and hydrogen-oxygen guns, the device and method significantly increase the speed and impact pressure of the target impact by adding a detonation driver and gradient flyers to the tail section of the launch tube without changing the light gas gun structure or launch process. This significantly reduces experimental costs compared to three-stage guns. Nitromethane is used as a propellant. Nitromethane is more readily available than high-energy explosives. Nitromethane is a liquid, eliminating the need for die-casting or melt-casting processes, resulting in greater versatility and applicability. As a liquid, nitromethane is more uniform than high-energy explosives, resulting in a higher-quality one-dimensional shock wave generated by detonation, which can better drive the gradient flyers to impact the second-stage flyers, achieving quasi-isentropic loading of the second-stage flyers.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solutions of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A light gas gun flying fragment boosting device, characterized by: The invention comprises a light gas gun, a detonation driver, a flyer and a target plate, wherein the target plate is arranged at the right end of the detonation driver, and the detonation driver is arranged at the right end of the light gas gun. Flyers are arranged at the end of the light gas gun, between the detonation driver and the target plate. The flyers include a primary flyer, a gradient flyer and a secondary flyer, and the centers of the secondary flyer, the gradient flyer and the primary flyer are located at the same horizontal height. The first-stage flyer is bonded to the end of the sabot, the center of the front end of the sabot coincides with the center of the first-stage flyer, the sabot is launched by the light gas gun, and the sabot is made of polycarbonate; The detonation driver comprises a metal bin, the end of the metal bin is provided with a metal outer edge, the metal outer edge is provided with a metal groove, the metal groove is connected to the cover plate, and the cover plate is made of organic glass; The metal chamber is filled with a propellant, which is nitromethane. The nitromethane liquid level is flush with the metal groove, and the purity of the nitromethane is not less than 99.5%; The first-level flyer is made of oxygen-free copper, with a thickness of 2mm and a diameter of 32mm, and the flatness of the upper and lower surfaces is better than 0.02mm; The gradient flyer is made of a material with varying wave impedance, wherein the inner layer is made of a low wave impedance material, the middle layer is made of a medium wave impedance material, and the outer layer is made of a high wave impedance material. The diameter of the gradient flyer is the same as the inner diameter of the detonation driver. The secondary flyer is made of oxygen-free copper; The gradient flyer plate and the secondary flyer plate are both arranged between the detonation driver and the target plate.

2. A light gas gun flying fragment boosting device according to claim 1, characterized in that: The secondary flying piece is made of metal material, and the upper and lower surfaces are finely polished, with a flatness of not less than 0.02mm. The diameter of the secondary flying piece is slightly smaller than the diameter of the gradient flying piece.

3. A method for using the light gas gun flying fragment boosting device according to any one of claims 1-2, characterized in that: The following steps are involved: Step 1: Assemble the detonation driver. Inject the propellant into the metal chamber, install the cover into the metal groove, and seal the joints between the cover and the metal groove with epoxy resin. Cover the cover with a heavy object and wait for the epoxy resin to completely cure. Step 2: Use epoxy resin to bond the first-stage flyer to the front end of the cartridge case. Step 3: The light gas gun drives the sabot and the first-stage flying piece to impact the detonation driver with a flat plate; Step 4: The detonation driver generates a detonation to drive the gradient flying piece, which drives the secondary flying piece to collide with the target plate to generate ultra-high impact pressure, thereby achieving the effect of light gas gun flying piece pressurization.

4. The method for using the light gas gun flying fragment boosting device according to claim 3, characterized in that: In step 3, the light gas gun drives the sabot and the first-stage flyer to perform a flat plate impact on the detonation driver, and the impact pressure generated by the flat plate impact is not lower than the impact detonation pressure of the detonation driver.

5. The method for using the light gas gun flying fragment boosting device according to claim 4, characterized in that: The inclination angle of the first-stage flying piece hitting the detonation driver in step 3 is less than 0.5°.

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