A device for measuring the pressure-volume relationship of an aluminized explosive reaction product

Abstract

The present application relates to a kind of measuring device of the pressure-volume relationship of aluminized explosive reaction product, the measuring device includes photon Doppler velocimeter, sealing bolt, slider, rubber washer, explosion tank and computing unit;The explosion tank cavity is equipped with the explosion cavity and sliding cavity being communicated, a movable slider is arranged in the sliding cavity;The sealing bolt is installed at the opening at the bottom of explosion tank, and the nut on the outer surface of the bottom of explosion tank is connected by thread;The probe of the photon Doppler velocimeter is installed on the outside of explosion tank and directly opposite the center of sliding cavity;The photon Doppler velocimeter is used to measure the speed of slider when explosive explodes;The computing unit obtains the pressure-volume relationship of aluminized explosive reaction product based on the speed of slider.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of explosion and impact technology, and particularly relates to a device for measuring the relationship between the pressure and volume of reaction products of an aluminum-containing explosive. BACKGROUND

[0002] Aluminum-containing explosives can be widely used in weapon systems such as missiles and artillery because of their high explosion heat, strong work capacity, low sensitivity and easy filling. In order to describe the relationship between the pressure, temperature and volume of the gas products after the explosion of the aluminum-containing explosive, study the mechanism of initiation, detonation and explosion effect, and guide the design direction of the aluminum-containing explosive, different state equations are introduced.

[0003] According to the pressure level, the detonation products of the explosive can be divided into three stages: high pressure, medium pressure and low pressure. For the structure of a closed space, such as a ship cabin, underground works and the like, the low pressure stage of the detonation products has an important influence on the damage effect, and therefore, it is a key to effectively evaluate the damage efficiency of the explosive to construct a state equation that can accurately describe the low pressure stage of the detonation products.

[0004] The parameters of different pressure terms in the state equation need to be calibrated through experiments. The ideal calibration method is to obtain the pressure-volume relationship of the detonation products at different pressure stages through experiments, and to fit them to obtain the accurate values of the parameters. For common state equations such as JWL and BKW, the parameters are generally calibrated through cylinder tests. However, as a non-ideal explosive, the aluminum-containing explosive has a special structure of the detonation reaction zone, a long chemical reaction zone, a complex composition of reaction products, and effects of subsequent secondary afterburning reactions and even multiple reactions, so it is difficult to measure the pressure-volume relationship of the aluminum-containing explosive at the low pressure stage of the detonation products through the cylinder test, and thus the parameters of the low pressure term of the state equation cannot be directly calibrated.

[0005] In this regard, another method is proposed. When the explosive explodes in a closed space, due to the constraint of the structure boundary on the explosion products, the shock wave will continuously reflect and superimpose in the closed space, and the high-temperature and high-pressure explosion gas products will mix uniformly under the condition that they cannot diffuse in time, and gradually form a pressure field. At this time, it can be considered that the explosion products enter the low pressure stage. Based on this cognition, a pressure sensor is installed in the closed space to directly measure the low pressure in the volume of the container, and the low pressure at different volumes is obtained through multiple experiments, so as to obtain the pressure-volume relationship of the aluminum-containing explosive at the low pressure stage.

[0006] Since the aluminum-containing explosive is a non-ideal explosive, it has a special structure of the detonation reaction zone, a long chemical reaction zone, a complex composition of reaction products, and effects of subsequent secondary afterburning reactions and even multiple reactions, and the cylinder test commonly used to calibrate the parameters of the state equation cannot give the pressure-volume relationship at the low pressure stage.

[0007] When measuring the low pressure section pressure of the aluminum-containing explosive in the closed space by using the pressure sensor, the sensor required not only has good low frequency response characteristics, but also has high anti-overload requirements, and is not easily damaged under the initial transient shock wave pressure. Even so, when using the traditional piezoelectric sensor, the influence of explosion light, heat and vibration is large, so there is a certain measurement error in measurement.

[0008] When measuring the low pressure section pressure of the aluminum-containing explosive in the closed space by using the pressure sensor, the measurement result is the pressure under a certain volume, which can only describe a point in the pressure-volume relationship. To obtain the complete low pressure section pressure-volume relationship, multiple experiments are required, which poses a great challenge to the experimental operation accuracy and investment cost. SUMMARY

[0009] In view of the above analysis, the embodiments of the present application aim to provide a device for measuring the pressure-volume relationship of the reaction product of aluminum-containing explosive, so as to solve the problem that the complete low pressure section pressure-volume relationship in the prior art requires multiple experiments, and the experimental investment cost is large and the result is not accurate enough.

[0010] In one aspect, the embodiments of the present application provide a device for measuring the pressure-volume relationship of the reaction product of aluminum-containing explosive, which comprises a photonic Doppler velocimeter, a sealing bolt, a sliding block, a rubber gasket, an explosion tank and a calculation unit.

[0011] The explosion tank cavity is provided with a communication 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 opening of the bottom of the explosion tank and is connected with the nut on the outer surface of the bottom of the explosion tank through threads.

[0013] The probe of the photonic Doppler velocimeter is installed outside the explosion tank and directly opposite the center of the sliding cavity.

[0014] The photonic Doppler velocimeter is used to measure the speed of the sliding block when the explosive explodes.

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

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

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

[0018] Further, the probe of the photonic Doppler velocimeter is installed in front of the center of the outer cavity of the explosion tank through the probe support.

[0019] Further, the measuring device further comprises a pressure sensor.

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

[0021] Further, the measuring device further comprises a rubber plate and a steel plate.

[0022] The rubber plate and the steel plate are placed behind the probe support of the photonic Doppler velocimeter for the recovery of the slider after the explosion.

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

[0024] Further, the main body of the slider is a cylinder, and an inner groove is formed in the side surface, and an O-shaped rubber ring is arranged in the inner groove.

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

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

[0027] The speed and time of each sampling point are polynomially fitted to generate a relationship between the speed and the time, and then a relationship between the acceleration and the time and a relationship between the displacement of the slider and the time are obtained.

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

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

[0030] Further, the computing unit is also used for acquiring the explosion pressure p' of each sampling point measured by the pressure sensor, acquiring the time of each sampling point, and obtaining p by multi-point average denoising method c , and further obtaining the pressure p c and time relationship;

[0031] Comparing p and p c of the same time period, if the time proportion of the measured pressure ratio greater than the first threshold value and less than the second threshold value is greater than the percentage threshold value Th, the pressure p about time is taken as the reaction product pressure of the aluminum-containing explosive; otherwise, recalibrate the measuring device to obtain the reaction product pressure of the aluminum-containing explosive and the volume relationship.

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

[0033] 1. Since the reaction time of aluminum-containing explosive is long, the traditional cylinder test cannot give the pressure-volume relationship of the low-pressure stage of the detonation product, and the explosion of the aluminum-containing explosive in the closed space adopts the indirect measurement method based on the sliding block speed, so that the pressure-volume relationship of the low-pressure stage of the detonation product of the aluminum-containing explosive can be obtained.

[0034] 2. The indirect measurement method based on the sliding block speed is used to measure the pressure-volume relationship of the low-pressure stage of the aluminum explosive detonation product, which avoids the influence of too violent oscillation of the output data waveform in the measurement process of the traditional pressure sensor, and the operation is simple and the physical concept is clear in the data post-processing. At the same time, the pressure sensor is used for measurement, and the indirect measurement method is verified and supplemented.

[0035] 3. The device has strong overload capacity and can be applied to the measurement of the pressure-volume relationship of the low-pressure stage of the detonation product under a larger charge volume ratio.

[0036] In the present application, the above technical solutions can be combined with each other to realize more preferred combination solutions. Other features and advantages of the present application will be described in the subsequent specification, and some advantages will become apparent from the specification, or will be understood by implementing the present application. The purpose and other advantages of the present application can be realized and obtained by the contents specifically pointed out in the specification and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0037] The accompanying drawings are included to provide a further understanding of the application and are incorporated herein and constitute a part of the application. The drawings illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0038] Figure 1 It is a schematic diagram of a device for measuring the pressure-volume relationship of the reaction product of an aluminum-containing explosive.

[0039] Figure 2It is a sealing bolt structure schematic diagram of the reaction product pressure and volume relationship measuring device of the aluminized explosive of the application;

[0040] Figure 3 It is the velocity-time data and polynomial fitting curve measured by the photon Doppler velocimeter of the reaction product pressure and volume relationship measuring device of the aluminized explosive of the application.

[0041] Figure 4 It is a movement situation schematic diagram of the sliding block of the reaction product pressure and volume relationship measuring device of the aluminized explosive of the application in the explosion tank cavity;

[0042] Figure 5 It is a working principle schematic diagram of the photon Doppler velocimeter of the reaction product pressure and volume relationship measuring device of the aluminized explosive of the application;

[0043] Figure 6 It is a pressure sensor noise processing result schematic diagram of the reaction product pressure and volume relationship measuring device of the aluminized explosive of the application.

[0044] Reference signs:

[0045] 1-explosion tank;

[0046] 2-sliding block;

[0047] 3-sealing bolt;

[0048] 4-rubber washer;

[0049] 5-nut;

[0050] 6-pressure sensor;

[0051] 7-probe of photon Doppler velocimeter;

[0052] 8-probe support;

[0053] 9-fixed base;

[0054] 10-rubber plate;

[0055] 11-steel plate;

[0056] 12-laser to fiber loop-inlet;

[0057] 13-fiber loop to sensor probe outlet;

[0058] 14-fiber loop to light detector outlet. DETAILED DESCRIPTION

[0059] Preferred embodiments of the present application will be described in detail below with reference to the drawings, wherein the drawings constitute a part of this application, and illustrate embodiments of the present application together with the principles of the present application, but are not intended to limit the scope of the present application.

[0060] One specific embodiment of the present application discloses a device for measuring the relationship between pressure and volume of an explosive reaction product containing aluminum, as shown in the figure, Figure 1 The device comprises a photonic Doppler velocimeter, a sealing bolt, a sliding block, a rubber gasket, an explosion tank and a computing unit.

[0061] The explosion tank cavity is provided with a communication explosion cavity and a sliding cavity, and the sliding cavity is arranged with a movable sliding block.

[0062] The sliding block body is a cylinder, and the side surface is provided with an inner groove, and an O-shaped rubber ring is arranged in the inner groove.

[0063] The side surface of the sliding block of one specific embodiment of the present application is provided with three inner grooves, and an O-shaped rubber ring is arranged in the inner groove, which can avoid direct contact between the sliding block and the sliding cavity, and at the same time increase the air tightness to achieve the effect of sealing.

[0064] The sliding block is installed at the bottom of the sliding cavity before explosion, and moves in the sliding cavity during explosion; the hardness of the material selected for the sliding block needs to be lower than that of the explosion tank material, so as to avoid scratching the inner wall of the sliding cavity. When installing the sliding block, lubricating oil needs to be applied to the side surface of the sliding block in contact with the sliding cavity, so as to reduce the frictional resistance of the sliding block when sliding. Because the photonic Doppler velocimeter measures the speed of the sliding block based on the optical principle, the surface of the side of the sliding block facing the photonic Doppler velocimeter should be flat and smooth enough to reflect the light back when the light is incident.

[0065] The sealing bolt is installed at the opening at the bottom of the explosion tank, and is connected with the nut on the outer surface of the bottom of the explosion tank through threads.

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

[0067] The structure of the sealing bolt is shown in the figure, Figure 2 After the detonator wire is installed in the sealing bolt, glue is poured on both sides of the sealing bolt before installation. The diameters of the two ends of the detonator wire hole are designed to be large and small, so as to facilitate the pouring of strong glue. The explosive and the detonator are placed in the explosion cavity of the explosion tank in advance, and the detonator is located in the reserved hole in the center of the explosive. The sealing bolt is fixed with the explosion tank by using a nut, and the bottom of the nut of the sealing bolt is in contact with the explosion tank by using a rubber gasket. The rubber gasket is used to increase the friction, facilitate the fixation of the bolt, and improve the air tightness.

[0068] After the detonator wire is threaded through the detonator wire hole, strong glue is poured 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 to detonate the explosive.

[0070] The explosion tank cylinder wall needs to have a certain thickness to avoid deformation caused by excessive explosive charge quality and to 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 effect of the recoil force generated by the explosion. The detonator wire in the sealing bolt extends to the outside through the opening in the center 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 photonic Doppler velocimeter probe support for the recovery of the sliding block after the explosion.

[0073] In an embodiment of the present application, the detonator wire triggers the detonator to detonate the explosive through an electrical signal. After the explosive explodes, a large amount of high-temperature and high-pressure gas product is generated, which pushes the sliding block to move in the sliding cavity. At the same time, a photonic Doppler velocimeter is used to measure the speed-time curve of the sliding block. After the sliding block flies out, it will hit the photonic Doppler velocimeter, and the measurement will stop. Then, multiple rubber plates and steel plates are used to recover the scattered sliding block.

[0074] The probe of the photonic Doppler velocimeter is installed on the outside of the explosion tank directly opposite the center of the sliding cavity.

[0075] The probe of the photonic Doppler velocimeter is installed on the outside of the explosion tank directly opposite the center of the sliding cavity.

[0076] The photonic Doppler velocimeter is used to measure the speed of the sliding block when the explosive explodes.

[0077] The photonic Doppler velocimeter is a device that uses photonic Doppler velocimetry to measure the speed-time curve of the target. It has the advantages of non-contact measurement, fast dynamic response, and good measurement accuracy. During measurement, the photonic Doppler velocimeter needs to be arranged in the direction of the sliding block's advance to measure the speed-time curve of the sliding block when the explosive explodes. In order to prevent damage to the probe caused by the explosion vibration, the photonic Doppler velocimeter is arranged separately from the device with a certain gap.

[0078] Specifically, the working principle of the photonic Doppler velocimeter is as follows: Figure 5As shown, the laser emits laser light, which is received by the fiber optic circulator when passing through the 12th port and is emitted to the 13th port to reach the photonic Doppler velocimeter probe. The photonic Doppler velocimeter probe surface is partially reflective and partially transmissive to the laser light. Since the laser light reflected by the photonic Doppler velocimeter probe surface has no relative motion with the probe surface, the reflected light has no Doppler frequency shift and is used as reference light. The laser light transmitted by the photonic Doppler velocimeter probe surface irradiates on the slider, and the slider is in a moving state. Therefore, when the transmitted laser light returns to the probe, a Doppler frequency shift occurs, which is closely related to the speed of the slider. This light is called sensing light. The reference light and the sensing light return to the fiber optic circulator through the 13th port, and then reach the light detector through the 14th port. Through the device, the beat interference signal of the sensing light and the reference light can be detected by using the square detection characteristic. Then, the beat waveform and the corresponding data are recorded by using a high-speed oscilloscope. Further, the relationship between the speed of the slider and time can be obtained.

[0079] The measuring device further comprises a pressure sensor;

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

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

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

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

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

[0085] Based on the speed of the slider at each sampling point measured by the photonic Doppler velocimeter, the time of each sampling point is obtained, and the corresponding speed and time of each sampling point are obtained.

[0086] The speed and time of each sampling point are polynomial fitted to generate a relationship between speed and time, and further to obtain a relationship between acceleration and time and a relationship between slider displacement and time.

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

[0088] Since the photonic Doppler velocimeter is inevitably disturbed by an electrical signal during the measurement, the velocity obtained by the photonic Doppler velocimeter is fitted by using a third-order polynomial with respect to time to obtain a smooth curve, and a relationship between the velocity and the time is generated.

[0089] The original data measured by the photonic Doppler velocimeter and the fitted curve are shown in Figure 3 .

[0090] Based on the mass of the slider, the cross-sectional area, and the relationship between the acceleration of the slider and the time, a relationship between the explosion pressure p in the sealed space and the time is obtained; the relationship between the space volume V and the time after the movement is calculated by the initial space volume of the explosion tank, the cross-sectional area of the slider, and the relationship between the displacement of the slider and the time;

[0091] Specifically, the movement of the slider in the sliding cavity is shown in Figure 4 , the dashed 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 the Newtonian motion law of classical mechanics, the pressure p(t) and the volume V(t) in the sealed space at time t in the low-pressure stage of the detonation product are calculated by the following expressions:

[0092]

[0093]

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

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

[0096] Specifically, the initial time is taken as 0, the time interval is Δt, i is the time step, 0≤i≤n, and n needs to satisfy:

[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 from x(T)=L, L is the length of the sliding cavity. The time is brought into formula (1) and formula (2), so that the pressure and volume values at different times can be obtained: p(iΔt), V(iΔt). Polynomial fitting is performed on them, and the pressure-volume relationship p(V) in the low-pressure stage can be obtained.

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

[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 obtain the explosion pressure p' of each sampling point by multi-point average noise reduction method to obtain p c , and then obtain the relationship between the pressure p c and the time;

[0101] Because the pressure sensor measurement signal has too many burrs, it has a certain influence on the later data processing, so before using the p' data, the pressure sensor measurement signal curve is further denoised based on the multi-point average noise reduction method, and the denoising result is shown in Figure 6 .

[0102] Specifically, the origin software is used for denoising, the multi-point average noise reduction method averages the pressure values of each 250 sampling points obtained before and after the current sampling point, and the processed pressure is represented by p c .

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

[0104] The low-pressure segment pressure p c of the pressure sensor in the device is processed as a verification and supplement to the low-pressure stage pressure p measured based on the slider speed.

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

[0106] After the pressure sensor measurement signal is denoised, the pressure p c(t), p(t) are compared, and if there is percentage threshold Th above the data measured in the two pressure data, if there is percentage threshold Th above the data greater than the first threshold and less than the second threshold, it is considered that the low pressure section pressure p(t) measured based on the slider speed is reliable, which can be used to determine the pressure-volume relationship of the low pressure section of the aluminum-containing explosive detonation product, otherwise it is considered that the data reliability is doubtful, and the installation process and sealing treatment of the device need to be checked and retested.

[0107] Compared with the prior art, the aluminum-containing explosive reaction product pressure-volume relationship measuring device provided by the embodiment adopts an indirect measurement method based on slider speed to measure the pressure-volume relationship of the aluminum-containing explosive detonation product in the low pressure stage, avoids the influence of too severe output data waveform oscillation in the traditional pressure sensor measurement process, and is simple to operate in data post-processing and clear in physical concept. At the same time, the pressure sensor is used for measurement, and the indirect measurement method is verified and supplemented. Since the aluminum-containing explosive reaction time is long, the traditional cylinder test cannot give the pressure-volume relationship of the aluminum-containing explosive detonation product in the low pressure stage, and the indirect measurement method based on the slider speed is used to measure the pressure-volume relationship of the aluminum-containing explosive detonation product in the low pressure stage. The device has strong overload capacity and can be applied to the measurement of the pressure-volume relationship of the detonation product in the low pressure stage under a larger charge volume ratio.

[0108] Those skilled in the art can understand that all or part of the processes of the above-mentioned embodiments can be completed by a computer program instructing related hardware, and the program can be stored in a computer readable storage medium. The computer readable storage medium includes a magnetic disk, an optical disk, a read-only memory, a random access memory, etc.

[0109] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. An apparatus for measuring the pressure-volume relationship of an aluminum-containing explosive reaction product, comprising: The measuring device comprises a photon Doppler velocimeter, a sealing bolt, a sliding block, a rubber washer, an explosion tank and a calculation unit; The explosion tank cavity is provided with a communication explosion cavity and a sliding cavity, and the sliding cavity is arranged with a movable sliding block; The sealing bolt is installed at the opening of the bottom of the explosion tank and is connected with the nut of the outer surface of the bottom of the explosion tank through threads; The probe of the photon Doppler velocimeter is installed at the center of the outer cavity of the explosion tank. The photon Doppler velocimeter is used for measuring the speed of the sliding block when the explosive explodes. The calculation unit obtains the pressure-volume relationship of the aluminum-containing explosive reaction product based on the speed of the sliding block, and specifically comprises: based on the speed of the sliding block measured by the photon Doppler velocimeter at each sampling point, the time of each sampling point is obtained, and the speed and time corresponding to each sampling point are obtained. The speed and time of each sampling point are polynomial fitted to generate a relationship between speed and time, and then a relationship between acceleration and time and a relationship between sliding block displacement and time are obtained; based on the mass, cross-sectional area and acceleration-time relationship of the sliding block, the relationship between the explosion pressure p in the closed space and the time is obtained; the space volume V after movement is calculated through the initial space volume of the explosion tank, the cross-sectional area of the sliding block and the displacement-time relationship of the sliding block; based on the pressure-time relationship and the space volume V-time relationship, the pressure and corresponding volume of the same time sampling point are obtained, and the fitted pressure and corresponding volume are fitted to obtain the pressure-volume relationship of the aluminum-containing explosive reaction product.

2. The apparatus of claim 1, wherein, The center of the sealing bolt is arranged with a detonator wire hole, and the detonator wire hole has a diameter of d1 at one end of the sealing bolt with a nut and a diameter of d2 at the other end, wherein d1>d2.

3. The apparatus of claim 2, wherein, After the detonator wire is inserted through the detonator wire hole, strong glue is poured into the detonator wire hole to prevent the leakage of explosion product gas and ensure the sealing of the tank body.

4. The apparatus of claim 1, wherein, The probe of the photon Doppler velocimeter is installed in front of the center of the outer cavity of the explosion tank through the probe support.

5. The apparatus of claim 1 wherein, The measuring device further comprises a pressure sensor; The pressure sensor is installed in the opening of the side wall of the explosion tank through threads, and the pressure sensor head pressure-sensitive element is lower than the side wall of the explosion tank cavity.

6. The apparatus of claim 1, wherein, The measuring device further comprises a rubber plate and a steel plate; The rubber plate and the steel plate are placed behind the probe support of the photon Doppler velocimeter for the recovery of the sliding block after explosion.

7. The apparatus of claim 5, wherein, During the installation of the pressure sensor, vacuum silicone grease is first applied to the threaded surface of the side surface of the pressure sensor, and then the pressure sensor is installed in the threaded opening of the side wall of the explosion tank. After installation, strong glue is applied to the bottom and side surface area of the pressure sensor in the side wall opening to prevent the leakage of explosion product gas and ensure the sealing of the tank body.

8. The apparatus of claim 1 wherein, The main body of the sliding block is a cylinder, and an inner groove is opened on the side surface, and an O-shaped rubber ring is arranged inside.

9. The apparatus of claim 5, wherein, The computing unit is also configured to acquire the explosion pressure of each sampling point measured by the pressure sensor , acquire the time of each sampling point, and acquire the explosion pressure of each sampling point by a multi-point average denoising method to obtain p c , and further obtain the pressure p c and time relationship; Comparing p and p over the same time period c If the proportion of time for which the ratio of the measured pressures is greater than the first threshold value and less than the second threshold value is greater than the percentage threshold Th, the relationship of the pressure p with respect to time is taken as the pressure of the reaction products of the aluminium-containing explosive; Otherwise, recalibrate the measuring device to obtain the pressure-volume relationship of the aluminum-containing explosive reaction product.

Images