Device for measuring relationship between pressure and volume of reaction product of aluminum-containing explosive

Abstract

The invention relates to an aluminum-containing explosive reaction product pressure and volume relation measuring device. The measuring device comprises a photon Doppler velocimeter, a sealing bolt, a sliding block, a rubber gasket, an explosion tank and a calculation unit. An explosion cavity and a sliding cavity which are communicated with each other are arranged in the cavity of the explosion tank, and a movable sliding block is arranged in the sliding cavity; the sealing bolt is mounted at a bottom opening of the explosion tank and is in threaded connection with the nut on the outer surface of the bottom of the explosion tank; a probe of the photon Doppler velocimeter is installed outside the explosion tank and right faces the center of the sliding cavity. The photon Doppler velocimeter is used for measuring the speed of the sliding block when the explosive explodes; and the calculation unit obtains the relationship between the pressure and the volume of the reaction product of the aluminum-containing explosive based on the speed of the sliding block.

Description

Technical Field

[0001] The invention relates to the technical field of explosion and impact, in particular to a device for measuring the relationship between pressure and volume of reaction products of aluminum-containing explosives. Background Art

[0002] Aluminized explosives are widely used in missiles, artillery and other weapon systems due to their high explosion heat, strong working capacity, low sensitivity and easy loading. In order to describe the relationship between the pressure, temperature and volume of the product gas after the explosion of aluminum-containing explosives, study the mechanism of detonation, detonation and explosion, and guide the design direction of aluminum-containing explosives, people have introduced different state equations.

[0003] According to the pressure level, the detonation products of explosives can be divided into three stages: high pressure, medium pressure and low pressure. For confined space structures, such as ship cabins and underground fortifications, the low-pressure stage of the detonation products has an important influence on their damage effect. Therefore, constructing a state equation that can accurately describe the low-pressure stage of the detonation products has become the key to effectively evaluate the damage efficiency of explosives.

[0004] The parameters of different pressure terms in the state equation need to be calibrated experimentally. The ideal calibration method is to obtain the pressure-volume relationship of different pressure sections of the detonation products through experiments and fit them to obtain the accurate values ​​of various parameters. For common state equations, such as JWL and BKW, their parameters are generally calibrated through cylinder tests. However, as a non-ideal explosive, aluminum-containing explosives are difficult to measure the pressure-volume relationship of the low-pressure section of the detonation products of aluminum-containing explosives through cylinder tests due to the particularity of the structure of the detonation reaction zone, the long length of the chemical reaction zone, the complex composition of the reaction products, the existence of subsequent secondary afterburning reactions or even multiple reactions, and other effects. Therefore, the low-pressure term parameters of the state equation cannot be directly calibrated.

[0005] In this regard, people have proposed another method. When explosives explode in a confined space, due to the constraints of the structural boundary on the explosion products, the shock wave will continue to reflect and superimpose in the confined space. The high-temperature and high-pressure explosion gas products are mixed evenly under the condition that they cannot diffuse in time, and gradually form a pressure field. It can be considered that the explosion products have entered the low-pressure section at this time. Based on this understanding, a pressure sensor is installed in the confined space to directly measure the low-pressure section pressure under the container volume. Multiple experiments are carried out to obtain the low-pressure section pressure under different volumes, thereby obtaining the pressure-volume relationship of the low-pressure stage of the aluminum-containing explosive detonation products.

[0006] Since aluminum-containing explosives are non-ideal explosives, the structure of their detonation reaction zone is special, the chemical reaction zone is long, the composition of the reaction products is complex, and there are subsequent secondary afterburning reactions and even multiple reactions. The commonly used cylinder test for calibrating the parameters of the equation of state cannot give the pressure-volume relationship in the low-pressure section.

[0007] When aluminum-containing explosives explode in a confined space, using a pressure sensor to measure the pressure in the low-pressure section requires that the sensor not only have good low-frequency response characteristics, but also have high requirements for high overload resistance and not be easily damaged by the initial transient shock wave pressure. Even so, when using traditional piezoelectric sensors, they are greatly affected by the explosion light, heat and vibration, so there is a certain measurement error during measurement.

[0008] When using a pressure sensor to measure the low-pressure pressure of an aluminum-containing explosive exploding in a confined space, the measurement result is the pressure under a certain volume, which can only describe one point in the pressure-volume relationship. To obtain a complete low-pressure pressure-volume relationship, multiple experiments are required, which poses a huge challenge to the test operation accuracy and investment cost. Summary of the invention

[0009] In view of the above analysis, an embodiment of the present invention aims to provide a device for measuring the relationship between pressure and volume of reaction products of aluminum-containing explosives, so as to solve the problem in the prior art that a complete low-pressure section pressure-volume relationship requires multiple experiments, the experimental investment cost is high and the results are not accurate enough.

[0010] On the one hand, an embodiment of the present invention provides a device for measuring the relationship between pressure and volume of reaction products of aluminum-containing explosives, the device comprising a photon Doppler velocimeter, a sealing bolt, a slider, a rubber gasket, an explosion can, and a computing unit;

[0011] The explosion tank cavity is provided with a connected explosion cavity and a sliding cavity, and a movable sliding block is arranged in the sliding cavity;

[0012] The sealing bolt is installed at the bottom opening of the explosion tank and is connected to the nut on the outer surface of the bottom of the explosion tank through a thread;

[0013] The probe of the photon Doppler velocimeter is installed outside the explosion tank facing the center of the sliding cavity;

[0014] The photon Doppler velocimeter is used to measure the speed of the slider when the explosive explodes;

[0015] The calculation unit obtains the relationship between the pressure and volume of the reaction product of the aluminum-containing explosive based on the speed of the slider.

[0016] Furthermore, a detonator wire hole is arranged at the center of the sealing bolt. The detonator wire hole is located at a nut end of the sealing bolt with a diameter of d1 and a nut end of the sealing bolt with a diameter of d2, wherein d1>d2.

[0017] Furthermore, after the detonator wire is passed through the detonator wire hole, super glue is poured into the detonator wire hole to prevent the leakage of the explosion product gas and ensure the sealing of the tank body.

[0018] Furthermore, the probe of the photon Doppler velocimeter is installed in front of the center of the outer cavity of the explosion tank through a probe bracket.

[0019] Furthermore, the measuring device also includes a pressure sensor;

[0020] The pressure sensor is installed at the opening of the side wall of the explosion tank through threads, and the pressure sensitive element at the head of the pressure sensor is lower than the side wall of the cavity of the explosion tank.

[0021] Furthermore, the measuring device also includes a rubber plate and a steel plate;

[0022] The rubber plate and the steel plate are placed behind the photon Doppler velocimeter probe bracket and are used for recovering the slider after the explosion.

[0023] Furthermore, during the installation process of the pressure sensor, vacuum silicone grease is first applied to the threads on the side surface of the pressure sensor, and then the sensor is installed into the threads of the opening on the side wall of the explosion tank. After installation, strong glue is applied to the bottom and side areas of the pressure sensor in the opening on the side wall to prevent leakage of the explosion product gas and ensure the sealing of the tank body.

[0024] Furthermore, the slider body is a cylinder, the side surface of which is provided with an inner groove and a built-in O-shaped rubber ring.

[0025] Furthermore, the calculation unit obtains the relationship between the pressure and volume of the reaction product of the aluminum-containing explosive based on the speed of the slider, specifically including:

[0026] Based on the speed of the slider at each sampling point measured by the photon Doppler velocimeter, the time of each sampling point is obtained to obtain the speed and time corresponding to each sampling point;

[0027] Perform polynomial fitting on the speed and time of each sampling point to generate a relationship between speed and time, and then obtain a relationship between acceleration and time and a relationship between slider displacement and time;

[0028] Based on the relationship between the mass, cross-sectional area and acceleration of the slider and time, the relationship between the explosion pressure p in the confined space and time is obtained; the relationship between the initial space volume of the explosion tank, the cross-sectional area of ​​the slider and the displacement of the slider and time is used to calculate the relationship between the space volume V after the movement and time;

[0029] Based on the relationship between explosion pressure p and time and the relationship between space volume V and time, the pressure and corresponding volume at the same sampling point are obtained, and the sampled pressure and corresponding volume are fitted to obtain the relationship between pressure and volume of the reaction product of aluminum-containing explosives.

[0030] Furthermore, the calculation unit is also used to obtain the explosion pressure p' of each sampling point measured by the pressure sensor, obtain the time of each sampling point, and perform noise reduction processing on the explosion pressure p' of each sampling point by a multi-point average noise reduction method to obtain p c , and then get the pressure p c and time relationship;

[0031] Compare p and p in the same time period c If the pressure ratio of the two measured values ​​is greater than the first threshold and the time ratio less than the second threshold is greater than the percentage threshold Th, the relationship between the pressure p and time is taken as the pressure of the reaction product of the aluminum-containing explosive; otherwise, the measuring device is recalibrated to obtain the relationship between the pressure and volume of the reaction product of the aluminum-containing explosive.

[0032] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0033] 1. Due to the long reaction time of aluminum-containing explosives, the traditional cylinder test cannot give the pressure-volume relationship of the detonation products in the low-pressure stage. By detonating aluminum-containing explosives in a confined space and using an indirect measurement method based on the slider speed, the pressure-volume relationship of the detonation products of aluminum-containing explosives in the low-pressure stage can be obtained.

[0034] 2. The indirect measurement method based on slider speed is used to measure the pressure-volume relationship of aluminum explosive detonation products at low pressure stage, which avoids the influence of excessively violent output data waveform oscillation in the traditional pressure sensor measurement process. The data post-processing operation is simple and the physical concept is clear. At the same time, the pressure sensor measurement is used to verify and supplement the indirect measurement method.

[0035] 3. The device has a strong overload bearing capacity and can be used to measure the pressure-volume relationship of the low-pressure section of detonation products under a large charge-volume ratio.

[0036] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like components throughout the drawings.

[0038] Figure 1 This is a schematic diagram of a device for measuring the relationship between pressure and volume of a reaction product of aluminum-containing explosives according to the present invention;

[0039] Figure 2This is a schematic diagram of the sealing bolt structure of a device for measuring the relationship between pressure and volume of reaction products of aluminum-containing explosives according to the present invention;

[0040] Figure 3 The invention discloses speed-time data and a polynomial fitting curve measured by a photon Doppler velocimeter of a device for measuring the relationship between pressure and volume of reaction products of aluminum-containing explosives.

[0041] Figure 4 It is a schematic diagram of the movement of a slider of a device for measuring the relationship between pressure and volume of reaction products of aluminum-containing explosives in the cavity of an explosion tank according to the present invention;

[0042] Figure 5 A schematic diagram of the working principle of a photon Doppler velocimeter of a device for measuring the relationship between pressure and volume of reaction products of aluminum-containing explosives according to the present invention;

[0043] Figure 6 This is a schematic diagram of the noise processing results of a pressure sensor of a device for measuring the relationship between pressure and volume of reaction products of aluminum-containing explosives according to the present invention.

[0044] Reference numerals:

[0045] 1- Explosive can;

[0046] 2- Slider;

[0047] 3-Sealing bolt;

[0048] 4-Rubber gasket;

[0049] 5- nut;

[0050] 6- Pressure sensor;

[0051] 7-photon Doppler velocimeter probe;

[0052] 8-probe bracket;

[0053] 9-Fix the base;

[0054] 10-Rubber sheet;

[0055] 11- Steel plate;

[0056] 12-Laser to fiber circulator entrance;

[0057] 13-Optical fiber circulator to sensor probe outlet;

[0058] 14-Fiber optic circulator to optical detector outlet. DETAILED DESCRIPTION

[0059] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0060] A specific embodiment of the present invention discloses a device for measuring the relationship between pressure and volume of reaction products of aluminum-containing explosives, such as Figure 1 As shown, the measuring device includes a photon Doppler velocimeter, a sealing bolt, a slider, a rubber gasket, an explosion can and a computing unit;

[0061] The explosion tank cavity is provided with a connected explosion cavity and a sliding cavity, and a movable sliding block is arranged in the sliding cavity;

[0062] The slider body is a cylinder, the side surface of which is provided with an inner groove and an O-shaped rubber ring.

[0063] In a specific embodiment of the present invention, three inner grooves are formed on the side surface of the slider, and an O-shaped rubber ring is built in, which can avoid direct contact between the slider and the sliding cavity and increase the air tightness to achieve a sealed effect as much as possible.

[0064] The slider is installed at the bottom of the sliding cavity before the explosion and moves in the sliding cavity during the explosion. The hardness of the material used for the slider must be lower than that of the explosion tank material to avoid scratching the inner wall of the sliding cavity. When installing the slider, lubricating oil needs to be applied to the side surface where the slider contacts the sliding cavity to reduce the friction resistance of the slider when sliding. Because the photon Doppler velocimeter measures the slider speed based on optical principles, the surface of the slider facing the photon Doppler velocimeter should be flat and smooth enough to reflect light back when it is incident.

[0065] The sealing bolt is installed at the bottom opening of the explosion tank and is connected to the nut on the outer surface of the bottom of the explosion tank through a thread;

[0066] A detonator wire hole is arranged at the center of the sealing bolt. The detonator wire hole is located at the sealing bolt with a nut and has a diameter of d1 at one end and a diameter of d2 at the other end, wherein d1>d2.

[0067] Sealing bolt structure Figure 2 As shown, after the sealing bolt is installed with the detonator line, glue is poured on both sides before installation. The diameters of the two ends of the detonator line hole are designed to be large and small, in order to facilitate the injection of super glue. Explosives and detonators are pre-placed in the explosion chamber of the explosive tank, and the detonator is located in the reserved hole in the center of the explosive. The sealing bolt and the explosive tank are fixed with nuts, and the bottom of the nut of the sealing bolt is in contact with the explosive tank with a rubber gasket. The rubber gasket is used to increase friction, facilitate the fixing of the bolt, and improve air tightness.

[0068] After passing the detonator wire through the detonator wire hole, inject strong glue into the detonator wire hole to prevent the leakage of explosion product gas and ensure the sealing of the tank body.

[0069] The detonator wire triggers the detonator through an electrical signal to detonate the explosive.

[0070] The wall of the explosion tank needs to have a certain thickness to avoid deformation caused by excessive charge mass and reduce the influence of heat conduction on the experiment. The explosion tank is placed on a fixed base with an opening in the center to offset the influence of the recoil generated by the explosion. The detonator line in the sealing bolt extends to the outside through the center opening of the base.

[0071] The measuring device also includes a rubber plate and a steel plate;

[0072] The rubber plate and the steel plate are placed behind the photon Doppler velocimeter probe bracket and are used for recovering the slider after the explosion.

[0073] In a specific embodiment of the present invention, the detonator line triggers the detonator through an electrical signal to detonate the explosive. After the explosion of the explosive, a large amount of high-temperature and high-pressure gas products are generated, which push the slider to move in the sliding cavity. At the same time, a photon Doppler velocimeter is used to measure the speed-time curve of the slider movement. After the slider flies out, it hits the photon Doppler velocimeter, and the measurement is terminated. Subsequently, a plurality of rubber plates and steel plates are used to recover the scattered slider.

[0074] The probe of the photon Doppler velocimeter is installed outside the explosion tank facing the center of the sliding cavity;

[0075] The probe of the photon Doppler velocimeter is installed in front of the center of the outer cavity of the explosion tank through a probe bracket.

[0076] The photon Doppler velocimeter is used to measure the speed of the slider when the explosive explodes;

[0077] The photon Doppler velocimeter is an instrument that uses the photon Doppler velocimeter method to measure the target speed-time curve. It has the advantages of non-contact measurement, fast dynamic response, and good measurement accuracy. During measurement, the photon Doppler velocimeter needs to be arranged in the forward direction of the slider to measure the speed-time curve of the slider when the explosive explodes. In order to prevent the probe from being damaged by the explosion vibration, the photon Doppler velocimeter is arranged at a position separated from the device with a certain gap.

[0078] Specifically, the working principle of the photon Doppler velocimeter is as follows: Figure 5As shown, the laser emits laser light, and when the laser light passes through port 12, it is received by the fiber circulator and emitted to port 13, reaching the photon Doppler velocimeter probe. The surface of the photon Doppler velocimeter probe partially reflects and partially transmits the laser light. Since the laser light source reflected by the surface of the photon Doppler velocimeter probe has no relative motion with the probe surface, the reflected light has no Doppler frequency shift, and it is used as the reference light; while the laser light transmitted by the surface of the photon Doppler velocimeter probe irradiates the slider, and the slider is in a moving state, so when the transmitted laser light returns to the probe, a Doppler frequency shift occurs. The frequency shift is closely related to the movement speed of the slider, and this light is called sensing light. After the reference light and the sensing light return to the fiber circulator through port 13, they pass through port 14 and reach the optical detector. Through this device, the beat interference signal of the sensing light and the reference light can be detected by using its square detection characteristics, and then recorded by a high-speed oscilloscope to obtain the beat waveform and corresponding data, and further the relationship between the movement speed of the slider and time can be obtained.

[0079] The measuring device also includes a pressure sensor;

[0080] The pressure sensor is installed at the opening of the side wall of the explosion tank through threads, and the pressure sensitive element at the head of the pressure sensor is lower than the side wall of the cavity of the explosion tank.

[0081] During the installation process of the pressure sensor, vacuum silicone grease is first applied to the threads on the side surface of the pressure sensor, and then the sensor is installed into the threads of the opening on the side wall of the explosion tank. After installation, strong glue is applied to the bottom and side areas of the pressure sensor in the opening on the side wall to prevent leakage of the explosion product gas and ensure the sealing of the tank body.

[0082] A small hole is opened on the side wall of the explosion chamber for installing a pressure sensor, which is used to detect the pressure of the low-pressure section of the detonation product. In order to minimize the impact of explosion light, heat and vibration during detection and measurement, the pressure sensor is installed in a cylindrical concave hole so that its head is lower than the inner wall of the explosion chamber of the explosion tank.

[0083] The calculation unit obtains the relationship between the pressure and volume of the reaction product of the aluminum-containing explosive based on the speed of the slider.

[0084] The calculation unit obtains the pressure and volume relationship of the reaction product of the aluminum-containing explosive based on the speed of the slider, specifically including:

[0085] Based on the speed of the slider at each sampling point measured by the photon Doppler velocimeter, the time of each sampling point is obtained to obtain the speed and time corresponding to each sampling point;

[0086] Perform polynomial fitting on the speed and time of each sampling point to generate a relationship between speed and time, and then obtain a relationship between acceleration and time and a relationship between slider displacement and time;

[0087] Specifically, the sampling points of speed and time measured by the photon Doppler velocimeter during the explosion are transmitted to an external computer in real time through a data line. The processing method of the data obtained by the photon Doppler velocimeter is as follows: the speed and time of each sampling point are fitted using a third-order polynomial.

[0088] Since the measurement is inevitably interfered by electrical signals, the speed obtained by the photon Doppler velocimeter is fitted with a third-order polynomial about time to obtain a smooth curve, and a relationship between speed and time is generated.

[0089] The original photon Doppler velocimeter measured data and fitting curve are as follows Figure 3 shown.

[0090] Based on the relationship between the mass, cross-sectional area and acceleration of the slider and time, the relationship between the explosion pressure p in the confined space and time is obtained; the relationship between the initial space volume of the explosion tank, the cross-sectional area of ​​the slider and the displacement of the slider and time is used to calculate the relationship between the space volume V after the movement and time;

[0091] Specifically, the schematic diagram of the movement of the slider in the sliding cavity is as follows: Figure 4 As shown, the dotted line is the initial position of the slider, and the solid line is the position of the slider at time t. Under the condition of ignoring friction, according to Newton's law of motion in classical mechanics, the low-pressure stage pressure p(t) and volume V(t) of the detonation product in the confined space at time t are calculated by the following expressions:

[0092]

[0093]

[0094] Where M is the mass of the slider, S is the cross-sectional area of ​​the slider, and d is the slider diameter, V0 is the volume of the explosion chamber of the explosion tank, ΔV is the volume increment caused by the movement of the slider, a(t) is the slider acceleration, which is obtained by differentiating the slider speed with respect to time, and x(t) is the slider movement distance, which is obtained by integrating the slider speed with respect to time.

[0095] Based on the relationship between pressure p and time and the relationship between space volume V and time, the pressure and corresponding volume at the same sampling point are obtained, and the sampled pressure and corresponding volume are fitted to obtain the relationship between pressure and volume of the reaction product of aluminum-containing explosives.

[0096] Specifically, the initial time is taken as 0, the time interval is Δt, i is the number of time steps, 0≤i≤n, and for n, the following conditions must be satisfied:

[0097] nΔt<T (3)

[0098] In the above formula, T is the moment when the slider flies out of the sliding cavity, which is obtained by x(T)=L, and L is the length of the sliding cavity. Substituting time into formula (1) and formula (2), the pressure and volume values ​​at different times can be obtained: p(iΔt), V(iΔt). By fitting it with a polynomial, the pressure-volume relationship p(V) in the low-pressure stage can be obtained.

[0099] For different state equations, the low-pressure term parameters can be calibrated using the pressure-volume relationship in the low-pressure stage obtained above.

[0100] The calculation unit is also used to obtain the pressure p' of each sampling point measured by the pressure sensor, obtain the time of each sampling point, and perform noise reduction processing on the explosion pressure p' of each sampling point by a multi-point average noise reduction method to obtain p c , and then get the pressure p c Relationship with time;

[0101] Since the pressure sensor measurement signal has too many burrs, it has a certain impact on the subsequent data processing. Therefore, before using the p' data, the signal curve measured by the pressure sensor is further denoised based on the multi-point average noise reduction method. The schematic diagram of the noise reduction processing result is shown in Figure 6 shown.

[0102] Specifically, the invention uses origin software to perform noise reduction processing. The multi-point average noise reduction method takes the pressure values ​​of 250 sampling points available before and after the current sampling point for average processing. The processed pressure is expressed as p c express.

[0103] Compare p and p in the same time period c If the pressure ratio of the two measured values ​​is greater than the first threshold and the time ratio less than the second threshold is greater than the percentage threshold Th, the relationship between the pressure p and time is taken as the pressure of the reaction product of the aluminum-containing explosive; otherwise, the measuring device is recalibrated to obtain the relationship between the pressure and volume of the reaction product of the aluminum-containing explosive.

[0104] The low pressure section pressure p after being processed by the pressure sensor in this device c As a verification and supplement to the low-pressure stage pressure p measured based on the slider speed.

[0105] Specifically, the first threshold and the second threshold are set according to the required accuracy; the percentage threshold Th is also set according to the required accuracy. If the accuracy requirement is high, the percentage threshold is high; if the accuracy requirement is low, the percentage threshold is low.

[0106] After the pressure sensor measurement signal is subjected to noise reduction processing, the pressure p measured by both at each moment within the effective measurement time 0 to T is cIf there is data above the percentage threshold Th that is greater than the first threshold and less than the second threshold in the pressure data measured by the two pressure sensors, the low-pressure section pressure p(t) measured based on the slider speed is considered to be reliable and can be used to determine the relationship between the pressure and volume of the low-pressure section of the detonation products of aluminum-containing explosives. Otherwise, the data reliability is considered to be questionable and the installation process and sealing treatment of the device need to be checked and re-tested.

[0107] Compared with the prior art, the pressure-volume relationship measurement device for the reaction products of aluminum-containing explosives provided in this embodiment uses an indirect measurement method based on the slider speed to measure the pressure-volume relationship of the low-pressure stage of the detonation products of aluminum-containing explosives, avoiding the influence of excessively violent oscillation of the output data waveform in the measurement process of the traditional pressure sensor, and the operation is simple in data post-processing, and the physical concept is clear. At the same time, the pressure sensor measurement is used to verify and supplement the indirect measurement method. Due to the long reaction time of aluminum-containing explosives, the traditional cylinder test cannot give the pressure-volume relationship of its detonation products in the low-pressure stage. When the aluminum-containing explosives are detonated in a confined space, the pressure-volume relationship of the low-pressure stage of the detonation products of aluminum-containing explosives can be obtained by using an indirect measurement method based on the slider speed. The device has a strong overload resistance and can be used to measure the pressure-volume relationship of the low-pressure stage of the detonation products under a large charge-volume ratio.

[0108] Those skilled in the art will appreciate that all or part of the processes of the above-mentioned embodiments can be implemented by instructing related hardware through a computer program, and the program can be stored in a computer-readable storage medium, wherein the computer-readable storage medium is a disk, an optical disk, a read-only storage memory, or a random access memory, etc.

[0109] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A device for measuring the relationship between pressure and volume of reaction products of aluminum-containing explosives, characterized in that: The measuring device comprises a photon Doppler velocimeter, a sealing bolt, a sliding block, a rubber gasket, an explosion can and a computing unit; The explosion tank cavity is provided with a connected explosion cavity and a sliding cavity, and a movable sliding block is arranged in the sliding cavity; The sealing bolt is installed at the bottom opening of the explosion tank and is connected to the nut on the outer surface of the bottom of the explosion tank through a thread; The probe of the photon Doppler velocimeter is installed outside the explosion tank facing the center of the sliding cavity; The photon Doppler velocimeter is used to measure the speed of the slider when the explosive explodes; The calculation unit obtains the relationship between the pressure and volume of the reaction product of the aluminum-containing explosive based on the speed of the slider.

2. The device for measuring the relationship between pressure and volume of reaction products of aluminum-containing explosives according to claim 1, characterized in that: A detonator wire hole is arranged at the center of the sealing bolt. The detonator wire hole is located at the sealing bolt with a nut and has a diameter of d1 at one end and a diameter of d2 at the other end, wherein d1>d2.

3. The device for measuring the relationship between pressure and volume of reaction products of aluminum-containing explosives according to claim 2, characterized in that: After passing the detonator wire through the detonator wire hole, inject strong glue into the detonator wire hole to prevent the leakage of explosion product gas and ensure the sealing of the tank body.

4. The device for measuring the relationship between pressure and volume of reaction products of aluminum-containing explosives according to claim 1, characterized in that: The probe of the photon Doppler velocimeter is installed in front of the center of the outer cavity of the explosion tank through a probe bracket.

5. The device for measuring the relationship between pressure and volume of reaction products of aluminum-containing explosives according to claim 1, characterized in that: The measuring device also includes a pressure sensor; The pressure sensor is installed to the opening of the side wall of the explosion tank through threads, and the pressure sensitive element of the head of the pressure sensor is lower than the side wall of the cavity of the explosion tank.

6. The device for measuring the relationship between pressure and volume of reaction products of aluminum-containing explosives according to claim 1, characterized in that: The measuring device also includes a rubber plate and a steel plate; The rubber plate and the steel plate are placed behind the photon Doppler velocimeter probe bracket and are used for recovering the slider after the explosion.

7. The device for measuring the relationship between pressure and volume of reaction products of aluminum-containing explosives according to claim 1, characterized in that: During the installation process of the pressure sensor, vacuum silicone grease is first applied to the threads on the side surface of the pressure sensor, and then the sensor is installed into the threads of the opening on the side wall of the explosion tank. After installation, strong glue is applied to the bottom and side areas of the pressure sensor in the opening on the side wall to prevent leakage of the explosion product gas and ensure the sealing of the tank body.

8. The device for measuring the relationship between pressure and volume of reaction products of aluminum-containing explosives according to claim 1, characterized in that: The slider body is a cylinder, the side surface of which is provided with an inner groove and an O-shaped rubber ring.

9. The device for measuring the relationship between pressure and volume of reaction products of aluminum-containing explosives according to claim 1, characterized in that: The calculation unit obtains the pressure and volume relationship of the reaction product of the aluminum-containing explosive based on the speed of the slider, specifically including: Based on the speed of the slider at each sampling point measured by the photon Doppler velocimeter, the time of each sampling point is obtained to obtain the speed and time corresponding to each sampling point; Perform polynomial fitting on the speed and time of each sampling point to generate a relationship between speed and time, and then obtain a relationship between acceleration and time and a relationship between slider displacement and time; Based on the relationship between the mass, cross-sectional area and acceleration of the slider and time, the relationship between the explosion pressure p in the confined space and time is obtained; the relationship between the initial space volume of the explosion tank, the cross-sectional area of ​​the slider and the displacement of the slider and time is used to calculate the relationship between the space volume V after the movement and time; Based on the relationship between explosion pressure p and time and the relationship between space volume V and time, the pressure and corresponding volume at the same sampling point are obtained, and the sampled pressure and corresponding volume are fitted to obtain the relationship between pressure and volume of the reaction product of aluminum-containing explosives.

10. The device for measuring the relationship between pressure and volume of reaction products of aluminum-containing explosives according to claim 9, characterized in that: The calculation unit is also used to obtain the explosion pressure p' of each sampling point measured by the pressure sensor, obtain the time of each sampling point, and perform noise reduction processing on the explosion pressure p' of each sampling point by a multi-point average noise reduction method to obtain p c , and then get the pressure p c and time relationship; Compare p and p in the same time period c If the ratio of the pressures measured by the two is greater than the first threshold and the time ratio of the pressures measured by the two pressures is greater than the percentage threshold Th, the relationship between the pressure p and the time is taken as the pressure of the reaction product of the aluminum-containing explosive; Otherwise, recalibrate the measuring device to obtain the pressure-volume relationship of the reaction products of aluminum-containing explosives.

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