A gas ejection experimental device

Abstract

The present invention belongs to the field of power launch experiments, and specifically relates to a gas ejection experimental device. It comprises a pressure chamber, a rear flange, a gas-sealing sleeve, a launch tube, a front head, a sensor fixing base, a barrel ferrule, and a dummy projectile, which are arranged in sequence. The pressure chamber is connected to the rear flange via a flange, the gas-sealing sleeve is placed in the launch barrel in the manner of a piston, and the rear flange and the launch tube, as well as the launch tube and the front head, are connected via threads. The present invention can experimentally measure the ejection internal ballistics by installing different charge gas generators in the pressure chamber. By varying the length of the engine growth tube, the internal ballistic characteristics under different low-pressure chamber initial volumes can be obtained. The front head of the present invention is equipped with a sealing tray recovery device, which can effectively improve the pressure release process after ejection, prevent the rapid escape of high-temperature gas, and enhance the concealment of the launch site.

Description

Technical Field

[0001] The invention belongs to the field of power launch experiments, and in particular relates to a gas ejection experimental device. Background Art

[0002] Missile launch methods can be categorized by launch propulsion power: self-propelled launch (also known as hot launch) and externally powered launch (also known as cold launch or catapult). Catapult launch relies on external power to eject the missile from the launcher. Once the missile reaches a certain distance, the onboard engine ignites, enabling launch. This is primarily used for underwater launches of submarine-launched missiles, silo launches of land-based ballistic missiles, and mobile launches. Gas-fired catapults utilize a large amount of fuel gas generated by a solid rocket motor located at the base of the catapult to propel the missile. These methods offer high energy, compact size, simple equipment, and high launch tube temperatures. They are currently widely used to launch various strategic and tactical missiles both domestically and internationally. Furthermore, these advantages of catapult launch align with the future development of missile launch methods that require greater mobility, speed, and stealth, making them a key development trend.

[0003] However, the current gas ejection device still has the following shortcomings in structural design:

[0004] 1) Current research indicates that the initial volume of the low-pressure chamber of the ejection system significantly affects the ejection internal ballistics: a smaller initial volume can increase the missile's exit velocity, but it will increase the maximum overload during launch and place higher demands on the missile's electronic components; a larger initial volume can reduce the maximum overload during launch, but it will waste a large amount of work done by the expansion of the gas, reducing the missile's exit velocity. The initial volume of the low-pressure chamber of current traditional gas ejection devices is generally difficult to adjust, which limits their use in different environments.

[0005] 2) To keep the missile sealed inside the barrel, a sealing tray is generally placed at the bottom of the missile when designing a gas ejection device. However, with current traditional gas ejection devices, the sealing tray is generally ejected together with the missile after it leaves the barrel, which not only causes waste but also causes the high-temperature and high-pressure gas in the barrel to be ejected in a very short time, which is not conducive to the concealment of the launch position. Summary of the Invention

[0006] The purpose of the present invention is to provide a gas ejection experimental device with measurable recoil, which solves the problem that the initial volume of the low-pressure chamber of the traditional gas ejection device is difficult to adjust and the high-temperature and high-pressure gas in the barrel is quickly ejected after the missile leaves the barrel.

[0007] The technical solution to achieve the purpose of the present invention is: a gas ejection experimental device, including a pressure chamber, a rear flange, a gas-sealing sleeve, a launch tube, a front head, a sensor fixing base, a gun barrel ferrule and a simulated projectile;

[0008] The pressure chamber is connected to the launch tube through the rear flange, the airtight sleeve is placed in the launch tube in the form of a piston, and the front head is connected to the launch tube through threads; the pressure chamber includes an engine growth tube and a rear end cover equipped with a wire bolt, and the ignition head connection line is connected to the interior of the pressure chamber through the wire bolt;

[0009] The engine growth tube can be replaced and the length of the engine growth tube is determined as follows:

[0010] Ballistic calculation equation in low-pressure chamber:

[0011]

[0012] Where p2 is the low pressure chamber pressure, V 20 is the initial volume of the low-pressure chamber, S2 is the cross-sectional area of ​​the launch tube, l m is the projectile displacement, m t1 is the total gas flow mass, is the gas mass flow rate, R is the gas constant, T2 is the low pressure chamber temperature, v m is the load speed;

[0013] The initial pressure rise stage of the low-pressure chamber, With S2l m It is a relatively small amount and is ignored here. According to the requirements of the projectile, the maximum overload pressure p2 and the pressure rise time t that the projectile can withstand are determined to obtain the peak velocity Determine the mass flow rate from the gas generator parameters Gas constant R and initial temperature T of low pressure chamber 20 ≈T2, calculated V 20 So that:

[0014]

[0015] The above V 20 This is the required initial volume of the low-pressure chamber, and the initial length of the low-pressure chamber is obtained. The sum of the initial length of the low-pressure chamber and the length of the gas generator is the engine growth tube length.

[0016] Furthermore, the rear flange includes a rear connecting flange, a bullet-blocking locking cover and a bullet-blocking locking shaft.

[0017] The rear connecting flange is a rotating part with a pair of stepped through holes in the normal direction. The bullet-blocking locking shaft is a stepped shaft with an oblique cut at one end, which is positioned and installed in the stepped through hole of the rear connecting flange through the shoulder set on it; the bullet-blocking locking cover is connected to the normal through hole of the rear connecting flange through threads, and a spring is installed in the through hole. The two ends of the spring are respectively pressed against the inner end of the bullet-blocking locking cover and the stepped part of the bullet-blocking locking shaft, so that the bullet-blocking locking shaft remains extended when not working, and can be quickly reset to realize the locking function when working.

[0018] Furthermore, the air-locking sleeve and the rear flange are positioned and installed through a bullet-blocking locking shaft; the air-locking sleeve includes a sealing tray, a tray sleeve and a sealing rubber;

[0019] The sealing tray is a rotating part with a triangular groove on the side. The groove matches the bevel groove of the bullet-blocking locking shaft. The two are aligned during installation to achieve positioning. The front end of the triangular groove of the sealing tray is an annular shoulder. The outer diameter of the shoulder is the same as the inner diameter of the launch tube. The end face of the sealing tray is perpendicular to the axis of the launch tube during assembly; the tray sleeve is a rotating part with steps. The larger diameter end of the tray sleeve is connected to the sealing tray by a thread, and the smaller diameter end of the tray sleeve is provided with a blind hole to achieve cooperation with the simulated bullet; the sealing rubber sleeve is connected to the tray sleeve and is in contact with the sealing tray for positioning.

[0020] Furthermore, the launch tube includes a barrel, a bullet stop block and a recoil sensor seat;

[0021] The gun barrel and bullet stop are positioned and installed through the steps processed on the outer surface of the gun barrel. The recoil sensor seat is sleeved between the two bullet stops according to the sensor size. After the installation is completed, the bullet stop block and the recoil sensor seat are fixed to the gun barrel by welding; the bullet stop block is used to cooperate with the gun barrel ferrule.

[0022] Furthermore, the barrel sleeve is sleeved on the launch tube, and the two can move relative to each other. The sensor fixing base is connected and fixed to the barrel sleeve by bolts.

[0023] Furthermore, the simulated bullet is placed inside the launch tube and is positioned and connected to the tray sleeve of the air-sealing sleeve through a circular blind hole processed at the bottom; the simulated bullet is provided with a centering part, the diameter of the centering part is the standard bullet body diameter, the height of the centering part is 2 to 5 mm, and the connection part between the centering part and the bullet body is smoothly transitioned; a threaded blind hole is opened at the head of the simulated bullet.

[0024] Furthermore, the front head includes a front connecting flange, a front flange pin and a front flange plug;

[0025] The front connecting flange is a tubular rotating body with a step on the outer surface. The smaller diameter end is threaded to connect with the launch tube, and the larger diameter end is normal to two pairs of stepped through holes. The front flange pin is positioned and installed in the stepped hole of the front connecting flange through the shoulder processed on the pin. The length of the front flange pin extending from the inner hole of the front connecting flange is less than the height of the centering part, to ensure that the front flange pin will not squeeze the projectile outside the centering part when the projectile passes through. The front flange plug is threadedly connected to the through hole of the front connecting flange, and a spring is installed in the through hole, which is respectively pressed on the front flange plug and the front flange pin at both ends, so that the front flange pin remains extended when not working, and resets when working to realize the tray recovery function.

[0026] Furthermore, the sensor fixing base is connected to the barrel ferrule by bolts, and no relative displacement occurs during operation. A circular boss is processed at the front end of the sensor fixing base for positioning and installing the sensor.

[0027] Furthermore, the present invention includes a method for conducting a ejection experiment using the above-mentioned experimental device, comprising the following steps:

[0028] Step (1): After the dummy projectile and the airtight cover are installed together, they are installed into the launch tube, positioned by the rear flange, and then enter the working state;

[0029] Step (2): The ignition line is connected to the high-pressure chamber through the line bolt of the pressure chamber. After ignition, the charge burns to generate gas, which flows from the high-pressure chamber into the low-pressure chamber of the gas ejection device through the nozzle;

[0030] Step (3): The pressure in the low-pressure chamber increases continuously until the load reaches the equilibrium pressure, and the load begins to be pushed. At this time, the simulated bullet and the airtight sleeve are pushed to move horizontally, the bullet blocking and locking shaft in the rear flange is pushed back, and the load begins to move horizontally along the barrel;

[0031] Step (4): During the translation process, the load generates a reaction force on the launch system due to acceleration, i.e., recoil. The launch tube is subjected to the recoil, which squeezes the sensor on the sensor fixing base fixed relative to the launch system base. This squeezing force is the measured recoil.

[0032] Step (5): At the end of the launch, when the simulated projectile passes through the front flange pin, the front flange pin is pushed back into the front head due to the smooth transition of the connection between the centering portion and the projectile body; when the centering portion leaves the front flange pin, the front flange pin extends under the action of the spring, the extension distance is less than the height of the centering portion, and does not contact the simulated projectile body;

[0033] Step (6): When the last centering part of the projectile leaves the front head, the front flange pin extends out. Since the sealing tray is perpendicular to the inner wall of the barrel, the front flange pin directly contacts the shoulder of the sealing tray, thereby preventing the sealing tray from being thrown out of the barrel, and the barrel begins to relieve pressure at the same time.

[0034] Compared with the prior art, the present invention has the following significant advantages:

[0035] (1) The present invention places the gas generator and the initial volume of the low-pressure chamber in the engine growth tube. After the charge shape and nozzle size are designed and determined, the remaining volume in the engine growth tube is the initial volume of the low-pressure chamber. According to the mass and caliber of the ejection load, combined with the maximum load that the electronic components in the load can withstand, the appropriate initial volume range of the low-pressure chamber can be preliminarily obtained. According to this range, a variety of engine growth tubes of different lengths are selected, and the ejection internal ballistic characteristics under different low-pressure chamber initial volumes can be obtained more conveniently.

[0036] (2) The present invention provides a front seal at the barrel outlet of the ejection device, and the front flange pin in the front seal extends from the inner hole of the front seal when not in operation; when the launch load passes through the front flange pin, the front flange pin will be pushed back into the front seal due to the smooth transition of the connection part between the centering part and the projectile; when the last centering part of the projectile leaves the front seal, the front flange pin extends out, and since the sealing tray is perpendicular to the inner wall of the barrel, the front flange pin is in direct contact with the sealing tray, thereby preventing the sealing tray from being thrown out of the barrel, and the barrel begins to slowly depressurize at the same time, avoiding the high-temperature and high-pressure gas from directly spraying out of the barrel, and the launch characteristic signal is small.

[0037] (3) The present invention provides a sensor fixing base, a barrel sleeve and a bullet block on the outer wall of the barrel, and fixes the gas ejection device on the base. The recoil curve during the launch process can be measured based on the sensor between the base and the ejection device, thereby guiding and improving the internal ballistic design.

[0038] (4) The gas-tight cover of the present invention adopts a layered design. The sealing tray material at the bottom is 30CrMnSiA, and the upper tray cover material is ABS. Compared with the traditional cartridge case, the material used for the sealing tray has good heat resistance and can significantly reduce the impact of high-temperature gas on the launch load during the launch process. The ABS has a low density and can effectively reduce the structural weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of the overall structure of the gas ejection experimental device of the present invention;

[0040] Figure 2 This is a schematic diagram of the pressure chamber structure of the gas ejection device of the present invention;

[0041] Figure 3 This is a schematic diagram of the rear flange structure of the gas ejection device of the present invention;

[0042] Figure 4 This is a schematic diagram of the structure of the gas-fired ejection device gas-sealed sleeve of the present invention;

[0043] Figure 5 This is a schematic diagram of the launch barrel structure of the gas ejection device of the present invention;

[0044] Figure 6 It is a schematic diagram of the front head structure of the gas ejection device of the present invention.

[0045] Description of reference numerals:

[0046] 1-pressure chamber, 2-rear flange, 3-air-sealing sleeve, 4-launching tube, 5-front head, 6-sensor fixing base, 7-barrel clamp, 8-dummy bullet, 9-line bolt, 10-engine extension tube, 11-rear end cover, 12-rear connecting flange, 13-bullet blocking locking cover, 14-bullet blocking locking shaft, 15-sealing tray, 16-tray sleeve, 17-sealing rubber, 18-barrel, 19-bullet blocking block, 20-recoil sensor seat, 21-front connecting flange, 22-front flange pin, 23-front flange plug. DETAILED DESCRIPTION

[0047] The present invention is further described in detail below with reference to the accompanying drawings.

[0048] like Figure 1-6 As shown, a gas ejection experimental device includes a pressure chamber 1, a rear flange 2, a gas-sealing sleeve 3, a launch tube 4, a front head 5, a sensor fixing base 6, a gun barrel ferrule 7 and a simulated projectile 8, which are arranged in sequence;

[0049] The pressure chamber 1 is connected to the rear flange 2, the airtight sleeve 3 is placed in the launch barrel 4 in the form of a piston, and the rear flange 2 and the launch barrel 4, and the launch barrel 4 and the front head 5 are connected by threads;

[0050] The pressure chamber 1 includes a threaded bolt 9, an engine growth tube 10 and a rear end cover 11;

[0051] A threaded hole for assembling the threaded bolt 9 is opened in the center of the rear end cover 11. The threaded bolt 9 is connected to the rear end cover 11 through threads. The ignition head connecting line is connected to the inside of the pressure chamber 1 through the threaded bolt. The rear end cover 11 is connected to the engine growth pipe 10 through a flange.

[0052] The pressure chamber 1 and the launch tube 4 are designed to be separated. The ballistic calculation equation in the low-pressure chamber is:

[0053]

[0054] It can be seen that the initial volume of the low-pressure chamber V 20 It has a great influence on the peak pressure of the low-pressure chamber; where p2 is the pressure of the low-pressure chamber, V 20 is the initial volume of the low-pressure chamber, S2 is the cross-sectional area of ​​the launch tube, l m is the projectile displacement, m t1 is the total gas flow mass, is the gas mass flow rate, R is the gas constant, T2 is the low pressure chamber temperature, v m is the load speed.

[0055] The present invention adopts a detachable engine growth tube 10, and can achieve the function of changing the pressure peak of the low-pressure chamber by estimating and designing growth tubes of different lengths.

[0056] The estimation and determination method is as follows: during the initial pressure rise phase of the low-pressure chamber, With S2l m It is a relatively small amount and is omitted here. According to the technical requirements of the projectile, the maximum overload pressure p2 and the pressure rise time t that the projectile can withstand are determined to obtain the peak velocity Determine the mass flow rate from the gas generator parameters Gas constant R and initial temperature T of low pressure chamber 20 ≈T2, calculated V 20 So that:

[0057]

[0058] The above V 20 This is the required initial volume of the low-pressure chamber, and the initial length of the low-pressure chamber is obtained. The sum of this length and the length of the gas generator is the length of the engine growth tube 10.

[0059] The pressure chamber 1 and the launch tube 4 are connected via a rear flange 2;

[0060] The rear flange 2 includes a rear connecting flange 12, a bullet-blocking locking cover 13 and a bullet-blocking locking shaft 14. The rear connecting flange 12 is a rotating part with a pair of stepped through holes opened in the normal direction. The bullet-blocking locking shaft 14 is a stepped shaft with one end beveled and is positioned and installed in the stepped through hole of the rear connecting flange 12 through a shaft shoulder provided thereon; the bullet-blocking locking cover 13 is connected to the through hole in the normal direction of the rear connecting flange 12 by a thread, and a spring is installed in the through hole. The two ends of the spring are respectively pressed against the inner end of the bullet-blocking locking cover 13 and the stepped portion of the bullet-blocking locking shaft 14, so that the bullet-blocking locking shaft 14 remains extended when not in operation and can be quickly reset to achieve the locking function when in operation;

[0061] The air-locking sleeve 3 and the rear flange 2 are positioned and installed through a bullet-blocking locking shaft 14. The air-locking sleeve 3 includes a sealing tray 15, a tray sleeve 16 and a sealing rubber 17.

[0062] The sealing tray 15 is a rotating part with a triangular groove on the side. The groove corresponds to the bullet-blocking locking shaft 14 in the rear flange 2. The two are aligned to achieve positioning during installation. Its outer diameter is the same as the inner diameter of the launch tube 4, and the two are clearance-matched. The sealing tray 15 requires the end face to be perpendicular to the axis of the launch tube during assembly to ensure that the contact area with the front flange pin 22 is maximized at the end of the launch, thereby improving the recovery effect. The tray cover 16 is a rotating part with a step. The larger diameter end of the tray cover 16 is connected to the sealing tray 15 by a thread, and the smaller diameter end of the tray cover 16 is assembled with the simulated bullet 8 and has a blind hole. The sealing rubber 17 is sleeved on the tray cover 16, has an outer diameter the same as the inner diameter of the launch tube, and is in contact with the sealing tray for positioning.

[0063] The launch tube 4 includes a barrel 18, a bullet block 19 and a recoil sensor seat 20;

[0064] The barrel 18 and the bullet block 19 are positioned and installed by the steps machined on the outer surface of the barrel 18. The recoil sensor seat 20 is sleeved between the two bullet blocks 19 according to the sensor size. After installation, the bullet block 19 and the recoil sensor seat 20 are fixed to the barrel 18 by welding.

[0065] The launch tube 4 is connected to the front head 5 by threads. The front head 5 includes a front connecting flange 21, a front flange pin 22, and a front flange plug 23.

[0066] The front connecting flange 21 is a tubular rotating body with a step on the outer surface. The smaller diameter end is threaded and connected to the launch tube 4, and the larger diameter end is normal to two pairs of stepped through holes; the front flange pin 22 is positioned and installed in the stepped hole of the front connecting flange 21 by the shoulder processed on the pin. The length of the front flange pin 22 extending from the inner hole of the front connecting flange 21 is less than the height of the centering portion, ensuring that the front flange pin will not squeeze the projectile outside the centering portion when the projectile passes through; the front flange plug 23 is threadedly connected to the through hole of the front connecting flange 21, and a spring is installed in the through hole at both ends, which are respectively pressed on the front flange plug 23 and the front flange pin 22, so that the front flange pin 22 remains extended when not working, and can be quickly reset when working to realize the tray recovery function;

[0067] The barrel ferrule 7 is sleeved on the bullet-blocking block 19 of the launch tube 4, and the two are clearance-fitted and can slide relative to each other;

[0068] The sensor fixing base 6 is connected to the barrel ferrule 7 by bolts, and no relative displacement occurs during operation. A circular boss is machined at the front end of the sensor fixing base 6 to position and install the sensor;

[0069] The simulated projectile 8 is placed inside the launch tube 4 and is positioned and connected to the tray sleeve 16 of the air-sealing sleeve 3 through a circular blind hole processed at the bottom; the simulated projectile 8 is provided with a centering part, the diameter of the centering part is the standard projectile diameter, the height of the centering part is 2 to 5 mm, and the connection part between the centering part and the projectile body is smoothly transitioned; a threaded blind hole is opened on the head of the simulated projectile 8 for installing sensors or other components.

[0070] Working process:

[0071] First, the simulated bullet 8 and the gas-sealing sleeve 3 are installed in conjunction with each other and then installed into the launch tube 4. After being accurately positioned by the rear flange 2, it enters the working state; the ignition line is connected to the high-pressure chamber through the line bolt 9 of the pressure chamber 1. After ignition, the charge burns rapidly to generate a large amount of gas, which flows from the high-pressure chamber into the initial volume of the low-pressure chamber of the gas ejection device through the designed nozzle; as the gas continues to flow, the pressure in the low-pressure chamber continues to increase until the equilibrium pressure of the load is reached, and the load begins to be pushed. At this time, the simulated bullet 8 and the gas-sealing sleeve 3 are pushed to translate, and the bullet-blocking locking shaft 14 in the rear flange 2 is pushed back, and the load begins to translate rapidly along the barrel; during the translation process, the load generates a reaction force on the launch system due to acceleration, that is, recoil. Due to the action of the recoil, the launch tube 4 will be against the launch system base. The sensor on the relatively fixed sensor fixing base 6 produces extrusion, and this extrusion pressure is the measured recoil, and the launching process can be evaluated based on the recoil; at the final stage of launching, when the simulated bullet 8 passes through the front flange pin 22, due to the smooth transition of the connection part between the centering part and the projectile body, the front flange pin 22 will be pushed back into the front head 5; when the centering part leaves the front flange pin 22, the front flange pin 22 is rapidly extended by the spring, and the extension distance is less than the height of the centering part, and does not contact the projectile body of the simulated bullet 8; when the last centering part of the projectile body leaves the front head 5, the front flange pin 22 is extended, and since the sealing tray 15 is perpendicular to the inner wall of the barrel, the front flange pin 22 is in direct contact with the sealing tray 15, thereby preventing the sealing tray 15 from being thrown out of the barrel, and the barrel begins to slowly relieve pressure at the same time.

Claims

1. A gas ejection experimental device, characterized in that: It comprises a pressure chamber (1), a rear flange (2), an air-sealing sleeve (3), a launching tube (4), a front sealing head (5), a sensor fixing base (6), a gun barrel ferrule (7) and a simulated projectile (8); The pressure chamber (1) is connected to the launch tube (4) via a rear flange (2), the air-sealing sleeve (3) is placed in the launch tube (4) in the form of a piston, and the front end cover (5) is connected to the launch tube (4) via a threaded connection; the pressure chamber (1) includes an engine growth tube (10) and a rear end cover (11) equipped with a wire bolt (9), and the ignition head connection line is connected to the interior of the pressure chamber (1) via the wire bolt; The engine growth tube (10) can be replaced and the length of the engine growth tube (10) is determined according to the following method: Ballistic calculation equation in low-pressure chamber: Where p2 is the low pressure chamber pressure, V 20 is the initial volume of the low-pressure chamber, S2 is the cross-sectional area of ​​the launch tube, l m is the projectile displacement, m t1 is the total gas flow mass, is the gas mass flow rate, R is the gas constant, T2 is the low pressure chamber temperature, v m is the load speed; The initial pressure rise stage of the low-pressure chamber, With S2l m It is a relatively small amount and is ignored here. According to the requirements of the projectile, the maximum overload pressure p2 and the pressure rise time t that the projectile can withstand are determined to obtain the peak velocity Determine the mass flow rate from the gas generator parameters Gas constant R and initial temperature T of low pressure chamber 20 ≈T2, calculated V 20 So that: The above V 20 This is the required initial volume of the low-pressure chamber, and the initial length of the low-pressure chamber is obtained. The sum of the initial length of the low-pressure chamber and the length of the gas generator is the length of the engine growth tube (10).

2. The gas ejection experimental device according to claim 1, characterized in that: The rear flange (2) comprises a rear connecting flange (12), a bullet-blocking locking cover (13) and a bullet-blocking locking shaft (14). The rear connecting flange (12) is a rotating part with a pair of stepped through holes in the normal direction. The bullet-blocking locking shaft (14) is a stepped shaft with one end beveled and is positioned and installed in the stepped through hole of the rear connecting flange (12) through a shaft shoulder provided thereon; the bullet-blocking locking cover (13) is connected to the through hole in the normal direction of the rear connecting flange (12) through a thread, and a spring is installed in the through hole. The two ends of the spring are respectively pressed against the inner end of the bullet-blocking locking cover (13) and the stepped portion of the bullet-blocking locking shaft (14), so that the bullet-blocking locking shaft (14) remains in an extended state when not in operation and can be quickly reset to realize the locking function when in operation.

3. The gas ejection experimental device according to claim 2, characterized in that: The air-sealing sleeve (3) and the rear flange (2) are positioned and installed via a bullet-blocking locking shaft (14); the air-sealing sleeve (3) comprises a sealing tray (15), a tray sleeve (16) and a sealing rubber (17); The sealing tray (15) is a rotating part with a triangular groove on the side, and the groove matches the bevel groove of the bullet blocking locking shaft (14). The two are aligned to achieve positioning during installation. The front end of the triangular groove of the sealing tray (15) is an annular shoulder, and the outer diameter of the shoulder is the same as the inner diameter of the launch tube (4). The end face of the sealing tray (15) is perpendicular to the axial direction of the launch tube during assembly; the tray cover (16) is a rotating part with a step, and the larger diameter end of the tray cover is connected to the sealing tray (15) through a thread, and the smaller diameter end of the tray cover (16) is provided with a blind hole to achieve cooperation with the simulated bullet (8); the sealing rubber (17) is sleeved on the tray cover (16) and contacts and positions the sealing tray.

4. The gas ejection experimental device according to claim 3, characterized in that: The launch tube (4) includes a gun barrel (18), a bullet block (19) and a recoil sensor seat (20); The gun barrel (18) and the bullet-blocking block (19) are positioned and installed through the steps processed on the outer surface of the gun barrel (18); the recoil sensor seat (20) is sleeved between the two bullet-blocking blocks (19) according to the size of the sensor; after the installation is completed, the bullet-blocking block (19) and the recoil sensor seat (20) are fixed to the gun barrel (18) by welding; the bullet-blocking block (19) is used to cooperate with the gun barrel ferrule (7).

5. The gas ejection experimental device according to claim 4, characterized in that: The gun barrel sleeve (7) is sleeved on the launch tube (4), and the two can move relative to each other. The sensor fixing base (6) is connected and fixed to the gun barrel sleeve (7) by bolts.

6. The gas ejection experimental device according to claim 5, characterized in that: The dummy bullet (8) is placed inside the launch tube (4) and is positioned and connected to the tray sleeve (16) of the airtight sleeve (3) through a circular blind hole processed on the bottom; the dummy bullet (8) is provided with a centering portion, the diameter of the centering portion is the diameter of the standard bullet body, the height of the centering portion is 2 to 5 mm, and the connection part between the centering portion and the bullet body is smoothly transitioned; and a threaded blind hole is opened on the head of the dummy bullet (8).

7. The gas ejection test device according to claim 6, characterized in that: The front sealing head (5) comprises a front connecting flange (21), a front flange pin (22) and a front flange plug (23); The front connecting flange (21) is a tubular rotating body with a step on the outer surface, with a smaller diameter end having a thread connected to the launch tube (4), and a larger diameter end having two pairs of stepped through holes in the normal direction; the front flange pin (22) is positioned and installed in the stepped hole of the front connecting flange (21) through a shoulder processed on the pin, and the length of the front flange pin (22) extending from the inner hole of the front connecting flange (21) is less than the height of the centering portion, so as to ensure that the front flange pin will not squeeze the projectile outside the centering portion when the projectile passes through; the front flange plug (23) is connected to the through hole of the front connecting flange (21) by a thread, and a spring is installed in the through hole at both ends, which is respectively pressed on the front flange plug (23) and the front flange pin (22), so that the front flange pin (22) remains extended when not working, and resets when working to realize the tray recovery function.

8. The gas ejection experimental device according to claim 7, characterized in that: The sensor fixing base (6) is connected to the gun barrel ferrule (7) by bolts, and no relative displacement occurs during operation. A circular boss is processed at the front end of the sensor fixing base (6) for positioning and installing the sensor.

9. A method for conducting a ejection experiment using the experimental device according to any one of claims 1 to 8, characterized in that: The steps include: Step (1): The dummy projectile (8) is installed in conjunction with the airtight cover (3) and then installed in the launch tube (4). After being positioned by the rear flange (2), the projectile enters the working state. Step (2): The ignition line is connected to the high-pressure chamber through the line bolt (9) of the pressure chamber (1). After ignition, the charge burns to generate gas, which flows from the high-pressure chamber into the low-pressure chamber of the gas ejection device through the nozzle; Step (3): The pressure in the low-pressure chamber increases continuously until the load reaches the equilibrium pressure, and the load begins to be pushed. At this time, the simulated bullet (8) and the airtight sleeve (3) are pushed to move horizontally, the bullet blocking locking shaft (14) in the rear flange (2) is pushed back, and the load begins to move horizontally along the barrel; Step (4): During the translation process, the load generates a reaction force on the launch system due to acceleration, i.e., a recoil force. The launch tube (4) is acted upon by the recoil force, and the sensor on the sensor fixing base (6) fixed relative to the launch system base is squeezed. The squeezing force is the measured recoil force. Step (5): At the end of the launch, when the simulated projectile (8) passes the front flange pin (22), the front flange pin (22) is pushed back into the front head (5) due to the smooth transition of the connection between the centering portion and the projectile body; When the centering portion leaves the front flange pin (22), the front flange pin (22) extends under the action of the spring, the extension distance is less than the height of the centering portion, and does not contact the body of the simulated bullet (8); Step (6): When the last centering part of the projectile leaves the front head (5), the front flange pin (22) extends out. Since the sealing tray (15) is perpendicular to the inner wall of the barrel, the front flange pin (22) directly contacts the shoulder of the sealing tray (15), thereby preventing the sealing tray from being thrown out of the barrel, and the barrel begins to relieve pressure at the same time.

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