CN112946229B - Method for acquiring performance of aluminum-containing explosive based on cylinder-sheet device - Google Patents

Abstract

The invention relates to a method for obtaining the performance of aluminum-containing explosives based on a cylinder-thin slice device, belongs to the technical field of evaluating the work performance of aluminum-containing explosives, and solves the problem that existing cylinder experiments have strong limitations and cannot be used to study the performance of aluminum-containing explosives based on cylinder experiments . The steps of the method are as follows: using a cylinder-sheet device to conduct explosion experiments on aluminum-containing explosives and inert material-containing explosives respectively, and obtain the relationship between the expansion distance of the outer wall of the cylinder and the time-dependent relationship of the movement distance of the sheet during the detonation drive process of the aluminum-containing explosives. The first variation relationship, and the second variation relationship of the flake movement distance with time during the detonation driving process of explosives containing inert materials; based on the variation relationship of the cylinder outer wall expansion distance with time, the first variation relationship and the second variation relationship, the The state equation of the detonation products of aluminum explosives; based on the state equations of the detonation products of aluminum-containing explosives, the detonation performance of aluminum-containing explosives is obtained.

Description

A Method for Acquiring Properties of Aluminum-Containing Explosives Based on Cylinder-Flake Device

technical field

The invention relates to the technical field of evaluating the work performance of aluminum-containing explosives, in particular to a method for obtaining the performance of aluminum-containing explosives based on a cylinder-thin slice device.

Background technique

In the research of high explosives, high power is one of the main goals pursued. Adding metal particles to explosives is an important way to increase the power of explosives. At present, aluminum-containing explosives account for a large proportion of military high-power explosives. Aluminum powder mainly improves the explosive power from two aspects: on the one hand, the reaction of aluminum powder releases a large amount of heat, which increases the explosive heat and increases the total energy of the explosive; on the other hand, the reaction of aluminum powder changes the detonation energy release process of the explosive, making the explosive The output time of the detonation energy is extended, thereby improving the workability of the explosive. Fully understanding the detonation characteristics of aluminum-containing explosives and the reaction mechanism of aluminum powder in detonation can optimize the formula of aluminum-containing explosives, improve the energy output structure of explosives, and thus increase the power of explosives.

The experimental method of the explosive-driven cylinder can evaluate its metal accelerated work ability. The experiment obtained the velocity of the cylinder under the two-dimensional steady expansion state. The experiment of the aluminum-containing explosive cylinder ignores the influence of the detonation method and the sparseness of the axial boundary. Evaluation of the secondary reaction of aluminum powder. At present, for aluminum-containing explosives to drive cylinders to do work, research at home and abroad focuses on experiments. However, cylinder experiments cannot accurately measure and describe the reaction law of aluminum powder during cylinder expansion, and thus cannot establish the work performance of explosives and the performance of aluminum. Powder in the detonation product of the relationship between the reaction mechanism, so the cylinder experiment has great limitations for aluminum-containing explosives.

Contents of the invention

In view of the above-mentioned analysis, the embodiment of the present invention aims to provide a method for obtaining the performance of aluminum-containing explosives based on a cylinder-thin slice device, to solve the limitations of existing cylinder experiments for aluminum-containing explosives. Research on the performance of aluminum-containing explosives based on cylinder experiments.

The embodiment of the present invention provides a method for obtaining the performance of aluminum-containing explosives based on a cylinder-sheet device, the cylinder-sheet device at least includes a cylinder and a device arranged in the cylinder that moves axially with the detonation drive process sheet metal, the method comprising:

Step S1: Use the cylinder-sheet device to conduct explosion experiments on aluminum-containing explosives and inert material-containing explosives, and obtain the relationship between the expansion distance of the outer wall of the cylinder and the time-dependent relationship between the expansion distance of the outer wall of the cylinder and the movement distance of the sheet during the detonation drive process of the aluminum-containing explosives. The first variation relationship of the explosive containing the inert material, and the second variation relationship of the sheet moving distance with time during the detonation driving process of the explosive containing the inert material; the explosive containing the inert material is replaced by aluminum in the explosive containing aluminum Inert materials are obtained;

Step S2: Obtain the state equation of the detonation product of the aluminum-containing explosive based on the relationship of the expansion distance of the outer wall of the cylinder with time, the first variation relationship and the second variation relationship;

Step S3: Obtain the detonation performance of the aluminum-containing explosive based on the equation of state of the detonation product of the aluminum-containing explosive.

On the basis of above-mentioned scheme, the present invention also makes following improvement:

Further, the step S2 includes:

Step S21: Based on the relationship between the expansion distance of the outer wall of the cylinder with time, the first change relationship and the second change relationship, the relationship between the reactivity of the aluminum powder and the relative specific volume of the detonation product is obtained;

Step S22: Obtain the state equation of the detonation product of the aluminum-containing explosive based on the relationship between the reactivity of the aluminum powder and the relative specific volume of the detonation product.

Further, in the step S21, the relationship between the reactivity of the aluminum powder and the relative specific volume of the detonation product is obtained by performing the following steps:

Step S211: Based on the first variation relationship, the second variation relationship and formula (1), the reaction degree of aluminum powder at each moment is obtained:

Wherein, m represents the quality of described flake, n represents the work efficiency driven by flake, Q _Al represents the heat of reaction of aluminum, and _m represents the quality of the described aluminum-containing explosive; α represents the mass fraction of aluminum powder in the described aluminum-containing explosive; v _Al (t) and v _LiF (t) respectively represent the sheet velocity at the tth moment in the detonation driving process of the aluminum-containing explosive and the inert material explosive, and v _Al (t) is obtained based on the first variation relationship, Obtain v _LiF (t) based on the second variation relationship, and λ (t) represents the aluminum powder reactivity at the t moment;

Step S212: Obtain the relative specific volume of detonation products at each moment based on the relationship of the expansion distance of the outer wall of the cylinder with time;

Step S213: Based on the reactivity of the aluminum powder and the relative specific volume of the detonation product at each moment, the relationship between the reactivity of the aluminum powder and the relative specific volume of the detonation product is obtained.

Further, the equation of state of the detonation product of the aluminum-containing explosive is obtained by performing the following operations:

Step S221: Based on the relationship of the expansion distance of the outer wall of the cylinder with time, the relationship between the isentropic internal energy and the relative specific volume of the detonation products is obtained;

Step S222: Based on the value of the relative specific volume of the detonation products, divide the low-pressure stage and the medium-pressure stage;

Based on the relative specific volume of two or more sets of detonation products in the low-pressure stage and the corresponding aluminum powder reactivity and isentropic internal energy data fitting formula (2), the unknown parameters C and ω in the formula (2) are obtained:

分别表示当爆轰产物相对比容为

时的铝粉反应度、等熵内能；in,

Respectively, when the relative specific volume of detonation products is

Reactivity of aluminum powder, isentropic internal energy at time;

Based on the relative specific volume of two or more sets of detonation products in the medium pressure stage and the corresponding aluminum powder reactivity and isentropic internal energy data fitting formula (3), the unknown parameters B and R ₂ in the formula (3) are obtained:

Based on the detonation pressure _pJ and detonation velocity _DJ of the aluminum-containing explosive, formulas (4) and (5) are combined to obtain the unknown parameters A and _R1 in formulas (4) and (5):

ρ₀是炸药初始密度；in,

_ρ0 is the initial density of the explosive;

Step S223: After determining the unknown parameters C, ω, B, R ₂ , A and R ₁ , the equation of state of the detonation product of the aluminum-containing explosive is obtained:

Further, the inert material is lithium fluoride.

Further, the cylinder-sheet device also includes: a detonator connected in sequence, an explosive plane wave lens, a trigger probe, a booster charge, a charge sleeve, and a cylinder; Laser displacement interferometer in the direction;

The cylinder is used to place the aluminum-containing explosives and inert material-containing explosives to be tested.

Further, the detonation driving process starts with the action of the trigger probe and ends with the complete rupture of the cylinder.

Further, the laser displacement interferometer arranged in the radial direction of the cylinder is used to obtain the relationship of the expansion distance of the outer wall of the cylinder under the detonation drive as a function of time;

The laser displacement interferometer arranged in the axial direction of the cylinder is used to obtain the relationship of the movement distance of the sheet driven by detonation with time.

Further, a plurality of laser displacement interferometers are arranged at different positions in the radial direction of the cylinder, and based on the average value of data collected by the plurality of laser displacement interferometers, the expansion distance of the outer wall of the cylinder driven by detonation is obtained relationship over time.

Further, the cylinder-sheet device also includes a base; the base includes a bottom plate, side baffles vertically arranged on the bottom plate, two cylinder outer hoops with through holes and a bottom baffle, the The cylinder passes through the through hole; wherein, the two cylinder outer hoops provided with through holes are parallel to each other; the side baffle is used to fix the laser displacement interference set in the radial direction of the cylinder instrument; the bottom baffle is used to fix the laser displacement interferometer arranged in the axial direction of the cylinder

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

The method for obtaining the properties of aluminum-containing explosives based on the cylinder-sheet device provided by the present invention organically combines the cylinder device and the sheet system to provide a new cylinder-sheet device, which can simultaneously obtain aluminum-containing explosives In the process of detonation driving, the relationship between the expansion distance of the outer wall of the cylinder and the first change relationship of the sheet moving distance with time can be more accurately evaluated in the direction of vertical detonation wave propagation and along the direction of detonation wave propagation. Ability to drive work in direction.

In the present invention, the above technical solutions can also be combined with each other to realize more preferred combination solutions. Additional features and advantages of the invention will be set forth in the description which follows, and some of the advantages will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the matter particularly pointed out in the written description and appended drawings.

Description of drawings

The drawings are for the purpose of illustrating specific embodiments only and are not to be considered as limitations of the invention, and like reference numerals refer to like parts throughout the drawings.

FIG. 1 is a schematic diagram of a cylinder-sheet structure provided by an embodiment of the present invention;

Fig. 2 is a schematic diagram of the three-dimensional structure of the base provided by the embodiment of the present invention;

Fig. 3 is a flow chart of a method for obtaining properties of aluminum-containing explosives based on a cylinder-sheet device provided in an embodiment of the present invention.

Reference signs: 1-detonator; 2-explosive plane wave lens; 3-trigger probe; 4-boosting powder; 8-metal sheet; 9-laser displacement interferometer (DISAR); 10-laser displacement interferometer (DISAR); 11-base.

Detailed ways

Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the application and together with the embodiments of the present invention are used to explain the principle of the present invention and are not intended to limit the scope of the present invention.

First, introduce the cylinder-sheet device used in this embodiment: the structural diagram is shown in Figure 1, the cylinder-sheet device includes: a detonator 1 connected in sequence, an explosive plane wave lens 2, a trigger probe 3, a booster Column 4, powder column sleeve 5, cylinder 6; a thin metal sheet 8 arranged in the cylinder and moving axially with the detonation driving process, and a laser set in the radial direction and axial direction of the cylinder Displacement interferometer; wherein, the laser displacement interferometer 9 arranged in the radial direction of the cylinder is used to obtain the relationship of the expansion distance of the outer wall of the cylinder under the detonation drive; the laser displacement interferometer 9 arranged in the axial direction of the cylinder The laser displacement interferometer 10 is used to obtain the time-varying relationship of the moving distance of the sheet driven by the detonation. The laboratory was carried out using the above-mentioned cylinder-sheet device, and the aluminum-containing explosive/lithium fluoride-containing explosive 7 was placed in the cylinder 6 .

Multiple laser displacement interferometers are arranged at different positions in the radial direction of the cylinder (as shown in 9-a, 9-b, and 9-c in Figure 1), based on the average value of the data collected by the multiple laser displacement interferometers , to obtain the relationship of the expansion distance of the outer wall of the cylinder with time under the detonation drive, and the accuracy of the relationship of the expansion distance of the outer wall of the cylinder with time determined in this way is higher. In addition, in order to avoid the influence of data errors on the results, after collecting the expansion distances of the outer wall of multiple cylinders at the same time by using multiple laser displacement interferometers arranged in the radial direction of the cylinder, the error analysis can be performed first. If the expansion distances of the outer wall of the cylinder meet the error requirements, the average value of the collected distances is directly calculated; if there are one or more expansion distances of the outer wall of the cylinder that do not meet the error requirements, the expansion distances of the outer wall of the cylinder that do not meet the error requirements are eliminated , Only calculate the average value of the expansion distance of the outer wall of the remaining cylinder. The error requirement can be adaptively set according to the experimental precision requirement.

In order to fix the position of the cylinder and the laser displacement interferometer in the cylinder-sheet device, the cylinder-sheet device provided in this embodiment is also provided with a base 11, the three-dimensional structure schematic diagram of the base is shown in Figure 2; the base 11 It includes a bottom plate, a side baffle vertically arranged on the bottom plate, two cylinder outer hoops with through holes and a bottom baffle, and the cylinder passes through the through holes; the two cylinder outer hoops The hoops are parallel to each other; the side baffles are used to fix the laser displacement interferometer arranged in the radial direction of the cylinder; the bottom baffle is used to fix the laser displacement interferometer arranged in the axial direction of the cylinder displacement interferometer.

During the experiment, set parameters and select materials according to the method in Table 1:

Table 1 Relevant physical parameters of auxiliary materials and tools

Among them, the material of the cylinder is oxygen-free copper, which is beneficial to delay the expansion time of the cylinder and increase the width of the aluminum powder secondary reaction zone; at the same time, in order to avoid the lamination of the metal flake during the experiment, the material of the metal flake is also no Oxy copper.

Before the experiment, fix the cylinder through the through hole in the cylinder outer hoop of the base, and install the explosive sample and the experimental device in sequence according to Figure 1, wherein the side baffles of the base are used to fix the laser displacement of measuring points 1 to 3 Interferometer, the bottom baffle is used to fix the laser displacement interferometer at measuring point 4, the base is mainly used to fix the cylinder and the laser displacement interferometer, so that the data can be recorded by the laser displacement interferometer, and the outer rings of the two cylinders are located on the cylinder In the second half of the cylinder, without affecting the expansion of the first half of the cylinder, the movement of the sheet in the second half of the cylinder is kept smooth and the direction of movement is not affected by limiting the deformation of the second half of the cylinder.

During the experiment, first the detonator detonates the plane wave lens of the explosive, and the plane detonation wave generated by the explosion detonates the transfer charge, and then generates a stronger detonation wave to detonate the aluminum-containing explosive sample 7, and the detonation product of the plane wave lens of the explosive makes the ionization probe A signal is given to start the laser displacement interferometer 9 and the laser displacement interferometer 10 at the positions of measuring points 1 to 4. When the aluminum-containing explosive detonates and drives the cylinder to expand and the sheet to move forward, the laser displacement interferometer records the center of the sheet. The speed of axial movement of the point and the expansion speed of the outer wall of the cylinder. It should be noted that the data of the detonation driving process collected in this embodiment starts with the action of the trigger probe and ends with the complete rupture of the cylinder.

During the experiment, when measuring the relationship of the expansion distance of the outer wall of the cylinder with time, two measuring points 1-2 are symmetrically arranged at a position 300mm away from the cylinder initiation end for each experiment, and then one is arranged at a position 350mm away from the cylinder initiation end. Measuring point 3, measuring point 3 and 1 are on the same side, three sets of experimental data were obtained by three laser displacement interferometers in the first experiment, and the error analysis and average value were performed on them.

Aluminum-containing explosives can improve the functional performance of explosives by adding aluminum powder to the ideal base explosive. The aftereffect of aluminum powder has an important impact on the functional performance of explosives. In order to compare the effect of the addition of aluminum powder on the work done by the explosive and the reactivity of the aluminum powder at each moment during the detonation drive process, in addition to experiments on aluminum-containing explosives, it is also necessary to conduct experiments on explosives containing inert materials (such as lithium fluoride LiF) Explosive 7 was tested according to the experimental setup shown in Figure 1; since LiF is an inert material, it does not participate in the chemical reaction of explosives when it is used as a component of explosives, and its density is similar to that of aluminum powder, so it can be 1:1 by mass ratio replace. Therefore, after the experiment is completed, the aluminum powder in the above-mentioned aluminum-containing explosive formula is replaced with lithium fluoride of equal mass to prepare a lithium fluoride explosive, and the lithium fluoride explosive is tested according to the experimental setup shown in Figure 1, wherein The experimental procedures and collected physical parameters are the same as the above experiments.

This embodiment is based on the cylinder-sheet device described above, forming the method for obtaining the performance of aluminum-containing explosives based on the cylinder-sheet device in this embodiment. The flow chart is shown in Figure 3. The method includes:

Step S1: Use the cylinder-sheet device to conduct explosion experiments on aluminum-containing explosives and inert material-containing explosives, and obtain the relationship between the expansion distance of the outer wall of the cylinder and the time-dependent relationship between the expansion distance of the outer wall of the cylinder and the movement distance of the sheet during the detonation drive process of the aluminum-containing explosives. The first variation relationship of the explosive containing the inert material, and the second variation relationship of the sheet moving distance with time during the detonation driving process of the explosive containing the inert material; the explosive containing the inert material is replaced by aluminum in the explosive containing aluminum Inert materials are obtained;

Step S2: Obtain the state equation of the detonation product of the aluminum-containing explosive based on the relationship of the expansion distance of the outer wall of the cylinder with time, the first variation relationship and the second variation relationship;

Step S3: Obtain the detonation performance of the aluminum-containing explosive based on the equation of state of the detonation product of the aluminum-containing explosive.

Compared with the prior art, this embodiment provides a new cylinder-sheet device by organically combining the cylinder device and the sheet system. The relationship between the expansion distance of the outer wall of the barrel and the first change relationship of the sheet movement distance with time can more accurately evaluate the driving ability of the aluminum-containing explosive in the direction of vertical detonation wave propagation and along the direction of detonation wave propagation .

Preferably, said step S2 includes:

Step S21: Based on the relationship between the expansion distance of the outer wall of the cylinder with time, the first change relationship and the second change relationship, the relationship between the reactivity of aluminum powder and the relative specific volume of detonation products is obtained; specifically,

Step S211: Based on the first variation relationship, the second variation relationship and formula (1), the reaction degree of aluminum powder at each moment is obtained:

Considering that during the experiment of lithium fluoride-containing explosives, since lithium fluoride remains inert and does not participate in the reaction, the work done on the cylinder and the sheet is entirely the contribution of the detonation energy of the base explosive; while the work done by the aluminum-containing explosive on the cylinder and the sheet is in addition to In addition to the detonation energy of the base explosive, there is also the energy released by the aluminum powder participating in the reaction. In the process of the aluminum-containing explosive driving the cylinder and the sheet at the same time, the time-varying law of the aluminum powder reactivity of the detonation product to the cylinder and the sheet during the work done by the sheet can be obtained through the motion of the sheet, as shown in formula (1). The principle is: Subtract the kinetic energy of the flake driven by the lithium fluoride explosive from the kinetic energy of the flake driven by the aluminum-containing explosive, and the useful work done by the energy released by the aluminum powder reaction on the flake can be obtained, and then according to the energy released by the aluminum-containing explosive The efficiency of driving the movement of the sheet can be used to obtain the reaction degree of the detonation product to the aluminum powder in the process of doing work on the cylinder and the sheet.

Wherein, m represents the quality of described flake, n represents the work efficiency driven by flake, Q _Al represents the heat of reaction of aluminum, and _m represents the quality of the described aluminum-containing explosive; α represents the mass fraction of aluminum powder in the described aluminum-containing explosive; According to experience, Q _Al gets 20.126KJ/g, and η gets 0.18; v _Al (t) and v _LiF (t) represent described aluminium-containing explosive, containing inert material explosive respectively the sheet velocity at the tth moment in the detonation driving process , obtain v _Al (t) (i.e. the relationship among distance, speed, and time) based on the first variation relationship, and obtain v _LiF (t) (same as above) based on the second variation relationship; the tth moment The v _Al (t), v _LiF (t) can be brought into the formula (1) to obtain the aluminum powder reactivity λ(t) at the tth moment, and repeat the above process to obtain the aluminum powder reactivity at each moment;

Step S212: Obtain the relative specific volume of detonation products at each moment based on the relationship of the expansion distance of the outer wall of the cylinder with time;

满足：In this step, the relative specific volume of detonation products

satisfy:

Among them, v represents the specific volume of the detonation product, and v ₀ represents the initial specific volume of the explosive. Among them, v=V _product /m _product , V _product is the volume of detonation product at the measuring point, that is, the volume of the cylinder (V _product =πr ² dx, r is the inner diameter of the cylinder, and dx is the length of the measuring point along the cylinder length in the direction), m _product is the mass of detonation product at the measuring point, according to the law of mass conservation in the detonation process of aluminum-containing explosives, the mass of detonation product is equal to the initial mass of explosive (m _product = m _explosive = ρ ₀ πr ₀ ² dx, m _explosive is the initial mass of explosive, ρ ₀ is the initial density of explosive, r ₀ is the initial inner diameter of cylinder), v ₀ =V _explosive /m _explosive , V _explosive is the initial volume of explosive at the measuring point, that is, the initial cylinder Volume (V _explosive = πr ₀ ² dx).

In addition, the laser displacement interferometer at measuring points 1 to 3 in this embodiment recorded the relationship of the expansion distance of the outer wall of the cylinder with time. The nature of the change, the relationship between the inner and outer diameters of the cylinder can be obtained as shown in formula (3):

R(t) ² −r(t) ² =R ₀ ² −r ₀ ² and R(t)=R ₀ +ΔR(t) (3)

R(t) represents the outer diameter of the cylinder at time t, R ₀ is the initial outer diameter of the cylinder, r(t) represents the inner diameter of the cylinder at time t, r ₀ is the initial inner diameter of the cylinder, ΔR(t) is the laser The displacement distance of the outer surface of the cylinder recorded by the displacement interferometer at time t (that is, the expansion distance of the outer wall of the cylinder at time t), and the displacement of the outer surface of the cylinder recorded by measuring points 1 to 3 in Figure 1. Perform error analysis and take the average value to obtain ΔR(t), and calculate the inner and outer diameters of the cylinder at time t according to the parameters R ₀ , r ₀ and ΔR(t).

Comparing formulas (2) and (3), we can get the expression of relative specific volume of detonation products with time:

Among them, ΔR(t) represents the expansion distance of the outer wall of the cylinder of the aluminum-containing explosive at time t, and the relative specific volume of the detonation product at time t can be obtained by substituting the expansion distance of the outer wall of the cylinder at time t into formula (4) , the relative specific volume of detonation products at each moment can be obtained by repeating the above process;

Step S213: Based on the reactivity of the aluminum powder and the relative specific volume of the detonation product at each moment, the relationship between the reactivity of the aluminum powder and the relative specific volume of the detonation product is obtained.

In addition, based on the aluminum powder reactivity at each moment and the expansion distance of the outer wall of the cylinder, the relationship between the aluminum powder reactivity and the expansion distance of the cylinder outer wall can be obtained; based on the aluminum powder reactivity at each moment and the first change relationship, The relationship between the reaction degree of aluminum powder and the moving distance of the sheet can be obtained.

Step S22: Obtain the state equation of the detonation product of the aluminum-containing explosive based on the relationship between the reactivity of the aluminum powder and the relative specific volume of the detonation product.

Step S221: Based on the relationship of the expansion distance of the outer wall of the cylinder with time, the relationship between the isentropic internal energy and the relative specific volume of the detonation products is obtained;

Step S2211: Based on the relationship of the expansion distance of the outer wall of the cylinder with time, obtain the isentropic internal energy and the specific volume of detonation products at each moment; specifically,

Process the expansion distance of the outer wall of the cylinder at each moment to obtain the expansion velocity of the outer wall of the cylinder at the current moment (according to the relationship between distance, speed, and time), and bring it into formula (5) to obtain each moment The corresponding isentropic internal energy:

v_m、v₀分别表示圆筒的初始比容和炸药的初始比容，将第t时刻的u(t)代入公式(5)中，即可得到第t时刻的等熵内能E_S(t)，重复上述过程即可得到每一时刻的等熵内能；Among them, μ represents the mass ratio of the cylinder to the explosive, u(t) represents the expansion velocity of the cylinder outer wall of the aluminum-containing explosive at time t, and the relationship between the expansion distance of the cylinder outer wall and the time variation is obtained to obtain the expansion of the cylinder outer wall Speed; Q represents the detonation heat of the described aluminum-containing explosive; M is a constant related to the material properties of the cylinder, and when the cylinder is oxygen-free copper, its value is 0.5;

v _m and v ₀ denote the initial specific volume of the cylinder and the initial specific volume of the explosive, respectively. Substituting u(t) at the tth moment into formula (5), the isentropic internal energy E _S at the tth moment can be obtained ( t), the isentropic internal energy at each moment can be obtained by repeating the above process;

Step S2212: Based on the isentropic internal energy and the relative specific volume of the detonation products at each moment, the relationship between the isentropic internal energy and the relative specific volume of the detonation products is obtained;

It should be noted that the state equation of the detonation products of aluminum-containing explosives satisfies the following relationship:

However, the parameters A, B, C, ω, R ₁ , and R ₂ are all unknowns, which need to be determined based on the above information obtained. The process of determining the unknown parameters is described as follows:

Step S222: Based on the value of the relative specific volume of the detonation products, divide the low-pressure stage and the medium-pressure stage; for example, when the relative specific volume of the detonation products is greater than 6, it is in the low-pressure stage; when the relative specific volume of the detonation products When it is between 2-5, it is in the medium pressure stage;

Based on the relative specific volume of two or more groups of detonation products in the low-pressure stage and the corresponding aluminum powder reactivity and isentropic internal energy data fitting formula (7), the unknown parameters C and ω in the formula (7) are obtained:

分别表示当爆轰产物相对比容为

时的铝粉反应度、等熵内能；in,

Respectively, when the relative specific volume of detonation products is

Reactivity of aluminum powder, isentropic internal energy at time;

Based on the relative specific volume of two or more sets of detonation products in the medium pressure stage and the corresponding aluminum powder reactivity and isentropic internal energy data fitting formula (8), the unknown parameters B and R ₂ in the formula (8) are obtained:

Based on the detonation pressure _pJ and detonation velocity _DJ of the aluminum-containing explosive, formulas (9) and (10) are combined to obtain the unknown parameters A and _R1 in formulas (9) and (10):

in,

Step S223: After determining the unknown parameters C, ω, B, R ₂ , A and R ₁ , the equation of state of the detonation product of the aluminum-containing explosive is obtained:

After determining the equation of state of the detonation product of the aluminum-containing explosive, the detonation performance of the aluminum-containing explosive can be obtained based on the equation of state of the detonation product of the aluminum-containing explosive, specifically, based on the state of the detonation product of the aluminum-containing explosive obtained by fitting The detonation damage effect and driving performance of the aluminum-containing explosive can be studied by means of simulation.

Those skilled in the art can understand that all or part of the processes of the methods in the above embodiments can be implemented by instructing related hardware through computer programs, and the programs can be stored in a computer-readable storage medium. Wherein, the computer-readable storage medium is a magnetic disk, an optical disk, a read-only memory or a random access memory, and the like.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present invention can easily think of changes or Replacement should be covered within the protection scope of the present invention.

Claims (7)

1. A method for obtaining the performance of aluminum-containing explosives based on a cylinder-thin slice device, characterized in that the cylinder-thin slice device at least includes a cylinder and is arranged in the cylinder and moves axially with the detonation drive process sheet metal, the method comprising: Step S1: Use the cylinder-sheet device to conduct explosion experiments on aluminum-containing explosives and inert material-containing explosives, and obtain the relationship between the expansion distance of the outer wall of the cylinder and the time-dependent relationship between the expansion distance of the outer wall of the cylinder and the movement distance of the sheet during the detonation drive process of the aluminum-containing explosives. The first variation relationship of the explosive containing the inert material, and the second variation relationship of the sheet moving distance with time during the detonation driving process of the explosive containing the inert material; the explosive containing the inert material is replaced by aluminum in the explosive containing aluminum Inert materials are obtained; Step S2: Obtain the state equation of the detonation product of the aluminum-containing explosive based on the relationship of the expansion distance of the outer wall of the cylinder with time, the first variation relationship and the second variation relationship; Step S3: Obtain the detonation performance of the aluminum-containing explosive based on the equation of state of the detonation product of the aluminum-containing explosive; Described step S2 comprises: Step S21: Based on the relationship between the expansion distance of the outer wall of the cylinder with time, the first change relationship and the second change relationship, the relationship between the reactivity of the aluminum powder and the relative specific volume of the detonation product is obtained; In the step S21, the relationship between the reactivity of the aluminum powder and the relative specific volume of the detonation product is obtained by performing the following steps: Step S211: Based on the first variation relationship, the second variation relationship and formula (1), the reaction degree of aluminum powder at each moment is obtained:

Wherein, m represents the quality of described flake, n represents the work efficiency driven by flake, Q _Al represents the heat of reaction of aluminum, and _m represents the quality of the described aluminum-containing explosive; α represents the mass fraction of aluminum powder in the described aluminum-containing explosive; v _Al (t) and v _LiF (t) respectively represent the sheet velocity at the tth moment in the detonation driving process of the aluminum-containing explosive and the inert material explosive, and v _Al (t) is obtained based on the first variation relationship, Obtain v _LiF (t) based on the second variation relationship, and λ (t) represents the aluminum powder reactivity at the t moment; Step S212: Obtain the relative specific volume of detonation products at each moment based on the relationship of the expansion distance of the outer wall of the cylinder with time; Step S213: Based on the reactivity of the aluminum powder and the relative specific volume of the detonation product at each moment, the relationship between the reactivity of the aluminum powder and the relative specific volume of the detonation product is obtained; Step S22: Obtain the state equation of the detonation product of the aluminum-containing explosive based on the relationship between the reactivity of the aluminum powder and the relative specific volume of the detonation product; The equation of state of the detonation product of the aluminum-containing explosive is obtained by performing the following operations: Step S221: Based on the relationship of the expansion distance of the outer wall of the cylinder with time, the relationship between the isentropic internal energy and the relative specific volume of the detonation products is obtained; Step S222: Based on the value of the relative specific volume of the detonation products, divide the low-pressure stage and the medium-pressure stage; Based on the relative specific volume of two or more sets of detonation products in the low-pressure stage and the corresponding aluminum powder reactivity and isentropic internal energy data fitting formula (2), the unknown parameters C and ω in the formula (2) are obtained:

in,

Respectively represent the reactivity and isentropic internal energy of aluminum powder when the relative specific volume of the detonation product is v; Based on the relative specific volume of two or more sets of detonation products in the medium pressure stage and the corresponding aluminum powder reactivity and isentropic internal energy data fitting formula (3), the unknown parameters B and R ₂ in the formula (3) are obtained:

Based on the detonation pressure _pJ and detonation velocity _DJ of the aluminum-containing explosive, formulas (4) and (5) are combined to obtain the unknown parameters A and _R1 in formulas (4) and (5):

in,

_ρ0 is the initial density of the explosive; Step S223: After determining the unknown parameters C, ω, B, R ₂ , A and R ₁ , the equation of state of the detonation product of the aluminum-containing explosive is obtained:

2. The method for obtaining properties of aluminum-containing explosives based on a cylinder-thin slice device according to claim 1, wherein the inert material is lithium fluoride. 3. the aluminum-containing explosive performance acquisition method based on the cylinder-thin slice device according to claim 1, characterized in that, the cylinder-thin slice device also comprises: a detonator connected in sequence, an explosive plane wave lens, a trigger probe, A booster charge, a charge sleeve, and a cylinder; and a laser displacement interferometer arranged in the radial direction and the axial direction of the cylinder; The cylinder is used to place the aluminum-containing explosives and inert material-containing explosives to be tested. 4 . The method for obtaining properties of aluminum-containing explosives based on a cylinder-sheet device according to claim 3 , wherein the detonation driving process starts with the action of the trigger probe and ends with the complete rupture of the cylinder. 5. the aluminum-containing explosive performance acquisition method based on cylinder-thin slice device according to claim 3, is characterized in that, The laser displacement interferometer arranged in the radial direction of the cylinder is used to obtain the relationship of the expansion distance of the outer wall of the cylinder under the detonation drive as a function of time; The laser displacement interferometer arranged in the axial direction of the cylinder is used to obtain the relationship of the movement distance of the sheet driven by detonation with time. 6. the aluminum-containing explosive performance acquisition method based on cylinder-thin slice device according to claim 4, is characterized in that, A plurality of laser displacement interferometers are arranged at different positions in the radial direction of the cylinder, and based on the average value of data collected by the plurality of laser displacement interferometers, the expansion distance of the outer wall of the cylinder driven by detonation versus time is obtained alternative relation. 7. according to claim 5 or 6 described cylinder-thin slice device based aluminum-containing explosive performance acquisition method, it is characterized in that, described cylinder-thin slice device also comprises base; Described base comprises base plate, and is vertically arranged on The side baffles on the bottom plate, the two cylinder outer hoops with through holes and the bottom baffle, and the cylinder passes through the through holes; wherein, the two cylinder outer hoops with through holes The hoops are parallel to each other; the side baffles are used to fix the laser displacement interferometer arranged in the radial direction of the cylinder; the bottom baffle is used to fix the laser displacement interferometer arranged in the axial direction of the cylinder displacement interferometer.

Images