Detonation wave pressure measurement device for composite charge and three-wave point trajectory determination method

Abstract

The present invention relates to a detonation wave pressure measurement device and a three-wave point trajectory determination method for composite charge, belonging to the technical field of composite charge detonation, and solving the problems that the pressure of existing composite charge cannot be accurately measured when Mach reflection occurs under overpressure detonation, and the obtained three-wave point trajectory has poor accuracy and is not stable enough. The device includes a fixed bracket, a composite charge module to be tested and a composite charge structure column arranged in sequence inside the fixed bracket, and a cone partition and a detonation module arranged in sequence in front of the composite charge structure column; the composite charge module to be tested includes a plurality of tested units arranged in sequence, which include a composite charge block and a manganese-copper high-pressure sensor arranged on one end face of the composite charge block; and also includes a measurement module connected to the composite charge module to be tested, which is used to receive the voltage signal generated by each manganese-copper high-pressure sensor, and then obtain the corresponding Mach reflection pressure measurement value. Accurate measurement of the Mach reflection pressure of the detonation wave of the composite charge is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of composite charge detonation, and in particular to a detonation wave pressure measuring device for composite charge and a three-wave point trajectory determining method. Background Art

[0002] In the research of ammunition engineering, detonation physics, solid physics, and inertial confinement fusion, due to the strong impact of explosives under different charge structures and detonation methods, the convergence and superposition of detonation waves cause the explosives to exceed their critical detonation conditions, so that the state of their detonation products will deviate from the main isentropic line, and the flow field parameters such as pressure and velocity are much higher than the normal CJ ​​detonation state, thereby producing an overpressure detonation phenomenon, improving the energy release capacity and driving performance of explosives. In recent years, with the widespread application of new composite warheads, how to accurately describe the dynamic evolution laws of waveform superposition, convergence, pressure changes, etc. in the symmetrical collision zone in the internal flow field of composite charges has become a difficult and hot topic in the field of engineering application research.

[0003] At present, in terms of describing the evolution law of the detonation wave waveform after the collision of explosives, the slit scanning method is mainly used to obtain the "three-wave point trajectory of the detonation wave" and the detonation waveform of the entire charge, and analyze its detonation velocity distribution characteristics based on this, and study the distribution of the strong detonation area of ​​the charge. However, the slit scanning method may not accurately reflect the shape of the light spot when dealing with non-Gaussian distribution or complex light spots. The light energy that needs to pass through the slit is the accumulation of light in the slit direction, and some energy distribution information may be lost. In addition, a scanning camera cannot obtain the true propagation speed and direction of the detonation wave inside the composite charge structure. At the same time, the slit scanning method is relatively cumbersome, and it is necessary to select the appropriate number of slits and installation procedures. It is impossible to simultaneously obtain one-dimensional and two-dimensional clear images with high temporal and spatial resolution on the same time base and the same space base, and the synchronization accuracy is low. At present, there is no unified evaluation method and standard for the Mach reflection pressure of the collision zone in the composite charge structure in China. In addition, existing studies are mainly based on numerical simulation to obtain the pressure in the collision zone of the detonation wave, but it is greatly affected by the parameters of the explosive state equation, and the data acquisition is difficult and the accuracy needs to be verified.

[0004] Therefore, there is an urgent need for a detonation wave pressure measurement device for composite charges with wide applicability, high accuracy and strong stability, and a method for determining the three-wave point trajectory of the detonation wave of composite charges, so as to provide theoretical and technical support for analyzing the evolution law of the detonation wave waveform of composite charges and the change law of the flow field parameters of the detonation products, the driving / energy output characteristics of composite charges, and numerical simulation. Summary of the invention

[0005] In view of the above analysis, the embodiments of the present invention aim to provide a detonation wave pressure measurement device and a three-wave-point trajectory determination method for a composite charge, so as to solve the problems that the pressure of the existing composite charge cannot be accurately measured when Mach reflection occurs under overpressure detonation and the obtained three-wave-point trajectory has poor accuracy and is not stable enough.

[0006] On the one hand, an embodiment of the present invention provides a detonation wave pressure measurement device for composite charge, comprising a fixed bracket, a composite charge module to be measured, a composite charge structure column arranged in sequence inside the fixed bracket, and a cone partition and a detonation module arranged in sequence in front of the composite charge structure column; wherein the central axes of the fixed bracket, the composite charge module to be measured, the composite charge structure column, and the cone partition coincide; the angle of the top angle of the cone partition on the central axis is greater than or equal to the critical angle of Mach reflection;

[0007] The composite charge module to be tested comprises a plurality of units to be tested which are arranged in sequence; wherein the unit to be tested comprises a composite charge block and a manganese-copper high-pressure sensor arranged on one end surface of the composite charge block;

[0008] The measuring device also includes a measuring module connected to the composite charge module to be measured; wherein the measuring module is used to receive the voltage signals generated by each manganese-copper high-pressure sensor, and obtain the corresponding Mach reflection pressure measurement value based on each voltage signal.

[0009] Furthermore, the conical partition is a double-conical structure; a conical groove adapted to the conical partition is provided on one side of the composite charge structure grain column, which fits with the curved surface of the cone on one side of the conical partition.

[0010] Furthermore, the composite charge module under test also includes two organic glass plates; the two organic glass plates are respectively inserted into two square through holes provided in the fixing bracket, and a plurality of units under test arranged in sequence are fixed in the fixing bracket, and are fixed on the outside of the fixing bracket by two bolts;

[0011] Among them, one side of an organic glass plate is bonded to the composite charge structure column, and the other side is bonded to one side of the manganese copper high pressure sensor of several units to be tested connected in sequence; one side of another organic glass plate is bonded to one side of the composite charge block of several units to be tested connected in sequence.

[0012] Further, the measuring module includes a constant current source and an oscilloscope;

[0013] Each output end of the constant current source is connected to one end of each manganese copper high pressure sensor, and the input end is connected to the detonation module;

[0014] Each input end of the oscilloscope is connected to the other end of each manganese copper high pressure sensor, and the ground end is grounded.

[0015] Furthermore, the detonation module includes an electric detonator and an outer layer of high-explosion-rate explosive;

[0016] The outer layer of high-explosive-velocity explosive is arranged on the surface of the cone on the other side of the cone partition, and its shape is adapted to the cone on the other side of the cone partition, and an opening is arranged at the top; the electric detonator is arranged at the top opening of the outer layer of high-explosive-velocity explosive.

[0017] Furthermore, the composite charge block meets the following conditions:

[0018] ,

[0019] In the formula, , Respectively represent the inner and outer radii of the composite charge block, represents the critical radius of stable detonation of explosives, , Respectively represent the inner and outer charge densities of the composite charge block, , Respectively represent the detonation velocity of the inner and outer layers of the composite charge, Indicates the height of the composite charge block.

[0020] On the other hand, an embodiment of the present invention provides a method for determining a three-wave point trajectory for a composite charge based on the above-mentioned detonation wave pressure measurement device, comprising the following steps:

[0021] Based on the detonation wave pressure measurement device, each detonation wave incident angle sampling value and the corresponding detonation wave reflection pressure sampling value are obtained;

[0022] Based on the sampling values ​​of each detonation wave incident angle and the corresponding sampling values ​​of detonation wave reflection pressure, a slow-varying coefficient is obtained, and then a calculation model of detonation wave reflection pressure is obtained;

[0023] Based on the calculation model of detonation wave reflection pressure, the three-wave point trajectory of the detonation wave of the composite charge is obtained.

[0024] Furthermore, each detonation wave incident angle sampling value and the corresponding detonation wave reflection pressure sampling value are obtained by the following method:

[0025] The angles of the top angles of the cone partitions in the detonation wave pressure measurement device on the central axis are sequentially set based on the set angle range and angle interval, and the following are executed:

[0026] The detonation wave pressure measuring device is used to obtain the Mach reflection pressure measurement values ​​corresponding to the angle of the top angle of the current cone partition on the central axis;

[0027] Taking half of the angle of the top angle of the current cone partition on the central axis as the detonation wave incident angle, and taking the average of the Mach reflection pressure measurement values ​​as the detonation wave reflection pressure sampling value corresponding to the detonation wave incident angle;

[0028] Among them, the angle range of the top angle of the cone partition on the central axis is ;in, is the critical angle of Mach reflection.

[0029] Furthermore, the calculation model of detonation wave reflection pressure is obtained by the following method:

[0030] Based on the slow-varying coefficient, the detonation wave reflection pressure relationship is constructed;

[0031] Input each detonation wave incident angle sampling value and the corresponding detonation wave reflection pressure sampling value into the detonation wave reflection pressure relationship formula to obtain each slow-varying coefficient calculation value;

[0032] The average of the calculated values ​​of the slow-varying coefficients is taken as the slow-varying coefficient and substituted into the detonation wave reflection pressure relationship to obtain the detonation wave reflection pressure calculation model.

[0033] Furthermore, the three-wave point trajectory of the detonation wave of the composite charge is obtained by the following method:

[0034] Based on the composite charge radius and the Mach reflection critical angle, the coordinates of the intersection of the x-axis in the coordinate system are determined, and used as the coordinates of the initial trajectory point of the three-wave point trajectory; wherein, in the coordinate system, the origin is the detonation position, the x-axis represents the propagation distance of the detonation wave along the flow direction, and the y-axis represents the propagation distance of the detonation wave perpendicular to the flow direction;

[0035] Based on the coordinates of the initial trajectory points, the calculation model of the detonation wave reflection pressure, the set step size and the number of trajectory points, the coordinates of each trajectory point are obtained in turn;

[0036] Connect the coordinates of the initial trajectory point and the coordinates of each trajectory point to obtain the three-wave point trajectory of the composite charge detonation wave

[0037] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0038] The present invention provides a detonation wave pressure measuring device for composite charge and a three-wave point trajectory determination method. The measuring device comprises a fixed bracket, a composite charge module to be measured, a composite charge structure column arranged in sequence inside the fixed bracket, and a cone partition and a detonation module arranged in sequence in front of the composite charge structure column. The composite charge module to be measured comprises a plurality of measured units arranged in sequence, and the measured unit comprises a composite charge block and a manganese-copper high-pressure sensor arranged on one end face of the composite charge block. The measuring module also comprises a measuring module connected to the composite charge module to be measured, and is used to receive voltage signals generated by each manganese-copper high-pressure sensor, and obtain corresponding Mach reflection pressure measurement values ​​based on each voltage signal. The measurement can be used to measure the pressure of the composite charge. Quantitative analysis of the pressure in the collision zone of the composite charge can provide a comprehensive understanding of the internal reaction mechanism of the composite charge, observe the pressure after Mach reflection of the detonation wave collision zone, and simultaneously test the pressure of the detonation wave collision zone at different positions in the composite charge structure to achieve accurate measurement of the Mach reflection pressure of the detonation wave; based on the measuring device, the relationship between the pressure and the detonation wave incident angle is obtained, and the three-wave point trajectory of the detonation wave collision zone is obtained, which provides technical support for the optimization of the warhead structure of the inner and outer layers of the composite charge and the design of the explosive formula, and provides theoretical and technical support for the analysis of the evolution law of the detonation wave waveform of the composite charge and the change law of the flow field parameters of the detonation product, the driving / energy output characteristics of the composite charge, and numerical simulation.

[0039] 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

[0040] The accompanying drawings are only used for the purpose of illustrating specific embodiments and are not to be considered as limiting the present invention. In the entire drawings, the same reference symbols represent the same components;

[0041] Figure 1 A schematic structural diagram of a detonation wave pressure measuring device for a composite charge provided in an embodiment of the present invention;

[0042] Figure 2 A schematic flow chart of a method for determining three wave point trajectories of a composite charge provided by an embodiment of the present invention;

[0043] Reference numerals:

[0044] 1-electric detonator, 2-outer layer high-explosive explosive, 3-conical partition, 4-charge column sleeve, 5-composite charge structure charge column, 6-plexiglass plate, 7-manganese copper high pressure sensor, 8-composite charge block, 9-high temperature wire, 10-constant current source, 11-fixed bracket, 12-oscilloscope, 13-synchronizer, 14-high voltage power supply, 15-bolt, 16-ionization type copper foil electric probe. DETAILED DESCRIPTION

[0045] 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.

[0046] Example 1

[0047] A specific embodiment of the present invention discloses a detonation wave pressure measuring device for composite charge, such as Figure 1 As shown, it includes a fixed bracket 11, a composite charge module to be tested, a composite charge structure column 5 arranged in sequence inside the fixed bracket 11, and a cone partition 3 and a detonating module arranged in sequence in front of the composite charge structure column 5; wherein the central axis of the fixed bracket 11, the composite charge module to be tested, the composite charge structure column 5, and the cone partition 3 coincide; the angle of the top angle of the cone partition 3 on the central axis is greater than or equal to the critical angle of Mach reflection;

[0048] The composite charge module to be tested includes a plurality of units to be tested arranged in sequence; wherein the unit to be tested includes a composite charge block 8 and a manganese-copper high-pressure sensor 7 arranged on one end surface of the composite charge block 8;

[0049] The measuring device also includes a measuring module connected to the composite charge module to be measured; wherein the measuring module is used to receive the voltage signals generated by each manganese-copper high-pressure sensor 7, and obtain the corresponding Mach reflection pressure measurement value based on each voltage signal.

[0050] During implementation, the conical partition 3 is a double-conical structure; a conical groove adapted to the conical partition 3 is provided on one side of the composite charge structure column 5, which fits with the curved surface of the cone on one side of the conical partition 3.

[0051] Specifically, the material of the cone partition 3 is polyurethane or natural rubber.

[0052] It can be understood that the setting of the cone partition 3 can change the propagation trajectory of the detonation wave. After the detonation module is detonated, it is diffracted by the cone partition 3 and converges on the axis. The setting of the top angle of the cone partition 3 causes Mach reflection. The critical angle of Mach reflection is greater than or equal to the critical angle of Mach reflection, so as to ensure that the incident wave collides in the axial direction and the composite charge undergoes Mach reflection in the axial direction. The critical angle of Mach reflection can be calculated by the existing technology and will not be described in detail here.

[0053] Specifically, the material of the fixing bracket 11 is a non-conductive non-metallic material; preferably, the material of the fixing bracket 11 is organic glass.

[0054] In a specific implementation, the composite charge module to be tested also includes two organic glass plates 6; the two organic glass plates 6 are respectively inserted into two square through holes provided in the fixing bracket 11, and a plurality of units to be tested arranged in sequence are fixed in the fixing bracket 11, and are fixed on the outside of the fixing bracket 11 by two bolts 15;

[0055] Among them, one side of an organic glass plate is bonded to the composite charge structure column 5, and the other side is bonded to one side of the manganese copper high pressure sensor 7 of several units to be tested connected in sequence; one side of another organic glass plate is bonded to one side of the composite charge block 8 of several units to be tested connected in sequence.

[0056] Preferably, the number of units under test is four.

[0057] Specifically, the thickness of the plexiglass plate bonded to the composite charge structure column 5 is set to 1.5 mm to prevent the manganese-copper high-pressure sensor 7 connected thereto from being disconnected or turned on in advance and failing under the shearing action of the shock wave, so as to ensure a sufficiently long recording time and weaken the initial detonation wave pressure; the thickness of the other plexiglass plate is less than 1 mm to limit the axial movement of the unit under test and ensure close contact between the manganese-copper high-pressure sensor 7 and the composite charge block 8.

[0058] It can be understood that the two organic glass plates 6 are used to limit and fix a plurality of sequentially connected units to be tested, so as to prevent them from moving in the axial direction.

[0059] In a specific implementation, the measuring module includes a constant current source 10 and an oscilloscope 12;

[0060] Each output end of the constant current source 10 is connected to one end of each manganese copper high pressure sensor 7, and the input end is connected to the detonation module;

[0061] Each input end of the oscilloscope 12 is connected to the other end of each manganese-copper high-pressure sensor 7, and the ground end is grounded.

[0062] Specifically, the manganese-copper high pressure sensor 7 is connected to a constant current source 10 and an oscilloscope 12 via a high temperature line 9 .

[0063] Specifically, a 4-channel pulse constant current source is used to power 4 piezoresistive sensors at the same time, and the pulse width is set to 200 μs during measurement.

[0064] It can be understood that grounding the oscilloscope 12 can prevent interference signals and improve measurement accuracy.

[0065] In specific implementation, the detonation module includes an electric detonator 1 and an outer layer of high-explosion-rate explosive 2;

[0066] The outer layer high-explosive-velocity explosive 2 is arranged on the surface of the other side of the cone partition 3, and its shape is adapted to the cone on the other side of the cone partition 3, and an opening is arranged at the top; the electric detonator 1 is arranged at the top opening of the outer layer high-explosive-velocity explosive 2.

[0067] It should be noted that the outer layer high detonation velocity explosive 2 can provide external load pressure for the composite charge structure column 5, forcing the outer layer high detonation velocity explosive 2 to compress the composite charge structure column 5. The shape of the composite charge structure column 5 can provide conditions for the formation of detonation wave convergence inside the composite charge. The area shrinkage method can increase the detonation wave intensity to achieve energy convergence in space, and then the detonation wave forms an overpressure detonation in each composite charge block 8.

[0068] Optionally, the electric detonator 1 of the detonating module is a No. 8 electric detonator; the detonating module also includes an ionization copper foil electric probe 16; one end of the ionization copper foil electric probe 16 is connected to the outer layer high-explosion velocity explosive 2, and the other end is connected to the output end of the constant current source 10.

[0069] Specifically, a section of enameled wire is connected to the outer layer of high-explosion-velocity explosive 2, the ends are twisted together, a section is cut off, the paint on it is polished, and the metal part is exposed to serve as a probe, which is then glued to the outer layer of high-explosion-velocity explosive 2.

[0070] It can be understood that the No. 8 electric detonator is detonated by electric current, and the No. 8 electric detonator can be detonated when the current is greater than 2A. The probe is turned on by the conductive property of the explosive detonation product, giving a short-circuit signal to trigger the test system. In this way, the millisecond time accuracy system of the No. 8 detonator is converted into a microsecond time accuracy test controlled by the trigger probe through the probe, that is, the time from the detonation product turning on the probe to give a trigger signal to the end of the test is controlled at about 10μs, so as to facilitate the oscilloscope to use a high sampling rate to improve the time resolution of the signal.

[0071] Optionally, the electric detonator 1 in the blasting module is a high-voltage electric detonator; the blasting module also includes a high-voltage power supply 14 and a synchronizer 13; the first output end of the high-voltage power supply 14 is connected to the high-voltage electric detonator, and the second output end is connected to the input end of the synchronizer 13; the output end of the synchronizer 13 is connected to the input end of the constant current source 10.

[0072] Exemplarily, the high-voltage detonator is a LD-1 type detonator.

[0073] It is understandable that the high-voltage discharge detonation mechanism of high-voltage electric detonators requires a voltage of thousands of volts to detonate; if high-voltage electric detonators are used for detonation, a trigger probe is used to control the constant current source to output a pulse constant current signal, just like the No. 8 detonator. Although the detonation is normal, the constant current source often does not trigger, and there is no pulse constant current signal output, and the oscilloscope cannot record the signal. The reason is that the pulse current output will only be generated when the trigger interface of the constant current source is short-circuited. Under normal circumstances, the detonation products are conductive, and the detonation products will cause the trigger probe to short-circuit and conduct. However, due to the use of high-voltage electric detonators, a detonation voltage of several thousand volts or even tens of thousands of volts will be attached to the detonation products, forming a high voltage drop at the two poles of the probe, which is equivalent to connecting a large "resistance" between the two poles of the probe. If the resistance is greater than the trigger threshold designed by the constant current source, the constant current source will not output current. Since the detonation accuracy of high-voltage electric detonators is in the microsecond level, when using high-voltage electric detonators to test the detonation process, it is not necessary to set a trigger probe on the explosive device, and a high-precision synchronizer can be used to synchronize the detonation and measurement devices.

[0074] Preferably, before measuring the detonation wave pressure measurement device, the oscilloscope signal is detected to see if it is normal, and the measurement device is configured and debugged. In this process, the following should be noted: estimating the measured pressure value and reasonably determining the pressure measurement range; determining the performance parameters of the pulse constant current source to meet the measurement needs; selecting the correct synchronous trigger mode, trigger signal source, trigger signal polarity, trigger signal amplitude and trigger position, etc.; correctly selecting the cable, considering the signal attenuation of long cables and the impedance matching of dynamic measurements, SYV-50-3-1 and SYV-50-7-1 coaxial cables can be selected; ensuring the packaging quality of the low-resistance piezoresistance meter, its sensitive part must be uniform and flat, free of bubbles and impurities; before the formal measurement, complete the debugging of the entire system to ensure that each channel has a constant current signal output; before the formal measurement, conduct repeated tests to verify the reliability of the system's synchronous triggering.

[0075] In specific implementation, the composite charge block 8 meets the following conditions:

[0076] ,

[0077] In the formula, , Respectively represent the inner and outer radii of the composite charge block, represents the critical radius of stable detonation of explosives, , Respectively represent the inner and outer charge densities of the composite charge block, , Respectively represent the detonation velocity of the inner and outer layers of the composite charge, Indicates the height of the composite charge block.

[0078] It can be understood that by constraining the geometric dimensions and performance parameters of the composite charge block 8, the overpressure detonation of the composite charge can be achieved. The outer charge is the energy body, and the high detonation velocity explosive and the inner layer explosive are used to form a pressure gradient difference, forcing the high detonation velocity explosive and the inner layer explosive to form an overpressure detonation reaction in the axial direction.

[0079] Specifically, the manganese copper high pressure sensor 7 is obtained by the following method:

[0080] The manganese copper pressure sensitive element is encapsulated by using organic insulating film polytetrafluoroethylene;

[0081] More specifically, the adhesive encapsulated by No. 3 vacuum grease is evenly applied to both sides of the manganese copper pressure-sensitive original; after encapsulation, force is applied to ensure that there are no bubbles between the manganese copper pressure-sensitive original and the polytetrafluoroethylene film, and a plexiglass plate of the same size is placed on its surface, and a heavy object is used to press for more than three hours to solidify the glue, thereby completing the encapsulation of the manganese copper pressure-sensitive original;

[0082] Use a thin blade to scrape off the solidified glue at the welding points at both ends of the packaged manganese-copper pressure-sensitive component, and use a certain concentration of acetone solvent to clean the solder joints to wash off the solidified glue, and dry it to keep it clean. After the treatment is completed, take a small amount of solder paste and apply it to the solder joints of the manganese-copper sensor, and then take a high-temperature wire of the same length and weld it to the port solder joints of the packaged manganese-copper sensor. After welding, clean the soldering points with acetone solution. At the same time, ensure that the soldering between the packaged manganese-copper sensor and the high-temperature wire is firm and there is no cold solder joint.

[0083] The resistance values ​​at both ends of the treated manganese copper sensor are detected to obtain the manganese copper high pressure sensor 7. The detection includes whether the sensor is normal, whether there is a break, and whether the welding point with the high temperature wire is cold soldered.

[0084] More specifically, the lower limit of the range of the manganese-copper high-pressure sensor 7 is greater than three times the detonation of the inner layer explosive CJ in the composite charge.

[0085] More specifically, the thickness of the polytetrafluoroethylene film of the manganese-copper high-pressure sensor 7 of the measured unit close to the composite charge structure column 5 is set to 0.2 mm, and the thickness of the polytetrafluoroethylene film of other measured units is set to 0.1 mm to ensure that the first manganese-copper high-pressure sensor 7 has a sufficiently long recording time.

[0086] It can be understood that the bubbles can be further driven away when two organic glass plates are used to limit and fix a plurality of sequentially connected units to be tested.

[0087] Specifically, the composite charge structure column 5 has the same structure as the composite charge block 8 of the unit under test, and the outer layer high detonation velocity explosive 2 has the same structure as the outer layer charge of the composite charge block 8 of the unit under test.

[0088] Preferably, the detonation wave pressure measuring device also includes a charge sleeve 4; the charge sleeve 4 is a cylindrical structure adapted to the intersection of the fixed bracket 11 and the composite charge structure charge 5; the charge sleeve 4 is fitted with the outer surface of the fixed bracket 11 and the outer surface of the composite charge structure charge 5, and is used to fix the composite charge structure charge 5 and the fixed bracket 11.

[0089] It should be noted that the working process of the detonation wave pressure measurement device is:

[0090] The electric detonator 1 is inserted into the outer layer of high-explosive-velocity explosive 2, and the tail end of the detonator is connected to the detonator through the detonating wire; the detonator is detonated by the detonator, and after the outer layer of high-explosive-velocity explosive 2 is detonated, the trigger probe is turned on or triggered by the synchronizer 13, and the constant current source 10 starts to work; at the same time, in the detonation wave, the cone partition 3 generates an overpressure detonation phenomenon in the axis of the composite charge structure column 5, forming a Mach reflection, and the Mach reflection pressure is further transmitted to each manganese-copper high-pressure sensor 7 through the organic glass plate; the voltage signal generated by the manganese-copper high-pressure sensor is transmitted to the oscilloscope 12 for collection, and the corresponding Mach reflection pressure measurement value is obtained.

[0091] Compared with the prior art, the detonation wave pressure measuring device for composite charge provided in this embodiment comprises a fixed bracket, a composite charge module to be tested and a composite charge structure column arranged in sequence inside the fixed bracket, and a cone partition and a detonating module arranged in sequence in front of the composite charge structure column. The composite charge module to be tested comprises a plurality of units to be tested arranged in sequence, and the unit to be tested comprises a composite charge block and a manganese-copper high-pressure sensor arranged on one end surface of the composite charge block. The device also comprises a measuring module connected to the composite charge module to be tested, and is used to receive the voltage signals generated by each manganese-copper high-pressure sensor, and obtain the corresponding Mach reflection pressure measurement value based on each voltage signal. The measuring device can quantitatively analyze the pressure of the collision zone in the composite charge, so as to fully understand the internal reaction mechanism of the composite charge, observe the pressure after Mach reflection occurs in the collision zone of the detonation wave, and simultaneously test the pressure of the detonation wave collision zone at different positions in the composite charge structure, so as to achieve accurate measurement of the Mach reflection pressure of the detonation wave.

[0092] Example 2

[0093] A specific embodiment of the present invention provides a method for determining three wave point trajectories for composite charges, such as Figure 2 As shown, the following steps are included:

[0094] S1. Based on the detonation wave pressure measurement device in Example 1, each detonation wave incident angle sampling value and the corresponding detonation wave reflection pressure sampling value are obtained.

[0095] During implementation, each detonation wave incident angle sampling value and the corresponding detonation wave reflection pressure sampling value are obtained by the following method:

[0096] The angles of the top angles of the cone partition 3 in the detonation wave pressure measurement device on the central axis are sequentially set based on the set angle range and angle interval, and the following are performed:

[0097] The detonation wave pressure measuring device is used to obtain the Mach reflection pressure measurement values ​​corresponding to the angle of the top angle of the current cone partition 3 on the central axis;

[0098] Taking half of the vertex angle of the current cone partition 3 on the central axis as the detonation wave incident angle, and taking the average of the Mach reflection pressure measurement values ​​as the detonation wave reflection pressure sampling value corresponding to the detonation wave incident angle;

[0099] The angle range of the top angle of the cone partition 3 on the central axis is ;in, is the critical angle of Mach reflection.

[0100] Preferably, the angular interval is set to .

[0101] It can be understood that the cone partition 3 is an axisymmetric model, and the detonation wave conforms to the symmetric model during propagation, and each parameter is equivalent and balanced in the axisymmetric composite charge structure. Therefore, half of the angle of the top angle of the cone partition can be taken as the detonation wave incident angle for analysis.

[0102] It can be understood that the detonation wave pressure measurement device in this embodiment is simple to operate and can simultaneously measure the pressure of the detonation wave collision zone at different positions in the composite charge structure, thereby obtaining the Mach reflection pressure, which is more accurate and reliable.

[0103] S2. Based on the sampling values ​​of each detonation wave incident angle and the corresponding sampling values ​​of the detonation wave reflection pressure, a slow-varying coefficient is obtained, and then a detonation wave reflection pressure calculation model is obtained.

[0104] During implementation, the detonation wave reflection pressure calculation model is obtained by the following method:

[0105] Based on the slow-varying coefficient, the detonation wave reflection pressure relationship is constructed;

[0106] Input each detonation wave incident angle sampling value and the corresponding detonation wave reflection pressure sampling value into the detonation wave reflection pressure relationship formula to obtain each slow-varying coefficient calculation value;

[0107] The average of the calculated values ​​of the slow-varying coefficients is taken as the slow-varying coefficient and substituted into the detonation wave reflection pressure relationship to obtain the detonation wave reflection pressure calculation model.

[0108] In specific implementation, the detonation wave reflection pressure relationship is expressed as:

[0109] ,

[0110] in, ;

[0111] In the formula, represents the slow-varying coefficient, Indicates that the detonation incident angle is The Mach reflection pressure at Indicates the detonation wave pressure under the CJ state.

[0112] It should be noted that, by obtaining the detonation wave reflection pressure calculation model in step S2, the corresponding Mach reflection pressure at any detonation wave incident angle can be obtained.

[0113] S3. Based on the detonation wave reflection pressure calculation model, the three-wave point trajectory of the detonation wave of the composite charge is obtained.

[0114] During implementation, the three-wave point trajectory of the detonation wave of the composite charge is obtained by the following method:

[0115] S31. Determine the coordinates of the intersection of the x-axis in the coordinate system based on the radius of the composite charge and the critical angle of Mach reflection, and use them as the coordinates of the initial trajectory point of the three-wave point trajectory; wherein, in the coordinate system, the origin is the detonation position, the x-axis represents the propagation distance of the detonation wave along the flow direction, and the y-axis represents the propagation distance of the detonation wave perpendicular to the flow direction.

[0116] Specifically, the coordinates of the initial trajectory points are expressed as ;

[0117] in, , ;

[0118] In the formula, represents the radius of the composite charge, represents the critical angle of Mach reflection.

[0119] It should be noted that the radius of the composite charge is the sum of the radii of the inner charge and the outer charge.

[0120] S32. Based on the coordinates of the initial trajectory points, the detonation wave reflection pressure calculation model, the set step size and the number of trajectory points, the coordinates of each trajectory point are obtained in sequence.

[0121] In specific implementation, the coordinates of the trajectory points are obtained by the following method:

[0122] S321. Based on the coordinates of the current trajectory point, obtain the current detonation wave incident angle, and then obtain the current three-wave point growth angle.

[0123] Specifically, the three-wave point growth angle is expressed as:

[0124] ,

[0125] in, ;

[0126] In the formula, Indicates The three wave point growth angles corresponding to the coordinates of the trajectory points are: Indicates The detonation incident angle corresponding to the coordinates of the trajectory points is: Indicates that the detonation incident angle is The Mach reflection pressure at Indicates The coordinates of the trajectory points, Indicates the detonation wave pressure under the CJ state.

[0127] Specifically, the number of trajectory points is set according to actual needs.

[0128] S322: Based on the coordinates of the current track point, the three-wave point growth angle and the set step size, the coordinates of the next track point are obtained.

[0129] Specifically, the coordinates of the next trajectory point are expressed as ;in,

[0130] ,

[0131] In the formula, Indicates the set step size.

[0132] Preferably, the step size is set to 0.1.

[0133] S33, connecting the coordinates of the initial trajectory point and the coordinates of each trajectory point to obtain the three-wave point trajectory of the detonation wave of the composite charge.

[0134] It should be noted that the three-wave point trajectory of the detonation wave is obtained through the following analysis process:

[0135] The shape and position of the three-wave point trajectory curve of the detonation wave propagation vary with the explosion power and explosion height; when crossing the three-wave point trajectory line, the flow parameters will jump and the rays will be deflected. When the flow near the three-wave point is approximately a quasi-constant flow, any point on the three-wave point trajectory (the The coordinates of trajectory points) are set to , to satisfy the following relationship:

[0136] ,

[0137] In the formula, represents the coordinates of the initial trajectory point on the three-wave point trajectory, Represents the radius of the composite charge.

[0138] Will Detonation wave incident angle Substitute the following formula:

[0139] ,

[0140] Further we get:

[0141] ,

[0142] ,

[0143] Find the three-point wave growth angle :

[0144] ,

[0145] make , is the step length, according to the geometric relationship:

[0146] ,

[0147] In the formula, and They are The detonation wave incident angle at point Point coordinates.

[0148] for The three-wave point growth angle at the point , according to the trajectory point and the next trajectory point The geometric relationship is:

[0149] ,

[0150] From the above formula, we can get:

[0151] ,

[0152] In the formula, For trajectory points The coordinates of .

[0153] Finally, the three-wave point trajectory can be obtained by connecting the coordinates of each trajectory point in sequence.

[0154] Compared with the prior art, this embodiment provides a method for determining the three-wave point trajectory of a composite charge. Based on the measuring device in Embodiment 1, sampling values ​​of each detonation wave incident angle and corresponding sampling values ​​of the detonation wave reflection pressure are obtained, and then the slow-varying coefficient is obtained, and then the detonation wave reflection pressure calculation model is obtained, and then the three-wave point trajectory of the detonation wave of the composite charge is obtained to obtain the relationship between the pressure and the detonation wave incident angle, thereby obtaining the three-wave point trajectory of the detonation wave collision zone, providing technical support for the optimization of the warhead structure of the inner and outer layers of the composite charge and the design of the explosive formula, and providing theoretical and technical support for analyzing the evolution law of the detonation wave waveform of the composite charge and the change law of the flow field parameters of the detonation product, the driving / energy output characteristics of the composite charge, and numerical simulation.

[0155] 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.

[0156] 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 method for determining three wave point trajectories based on a detonation wave pressure measurement device, characterized in that: The following steps are involved: Based on a detonation wave pressure measurement device, sampling values ​​of each detonation wave incident angle and corresponding sampling values ​​of the detonation wave reflection pressure are obtained; the detonation wave pressure measurement device comprises a fixed bracket (11), a composite charge module to be tested, a composite charge structure column (5) arranged in sequence inside the fixed bracket (11), and a cone partition (3) and a detonation module arranged in sequence in front of the composite charge structure column (5); wherein the central axes of the fixed bracket (11), the composite charge module to be tested, the composite charge structure column (5), and the cone partition (3) coincide; and the angle of the top angle of the cone partition (3) on the central axis is greater than or equal to the Mach reflection critical angle; The composite charge module to be tested comprises a plurality of units to be tested which are arranged in sequence; wherein the unit to be tested comprises a composite charge block (8) and a manganese-copper high-pressure sensor (7) arranged on one end surface of the composite charge block (8); The measuring device further comprises a measuring module connected to the composite charge module to be measured; wherein the measuring module is used to receive the voltage signals generated by each manganese-copper high-pressure sensor (7), and obtain a corresponding Mach reflection pressure measurement value based on each voltage signal; in, The angles of the top angles of the cone partition (3) in the detonation wave pressure measurement device on the central axis are sequentially set based on the set angle range and angle interval, and the following are performed: The detonation wave pressure measuring device is used to obtain the Mach reflection pressure measurement values ​​corresponding to the angle of the top angle of the current cone partition (3) on the central axis; Taking half of the angle of the top angle of the current cone partition (3) on the central axis as the detonation wave incident angle, and taking the average of the Mach reflection pressure measurement values ​​as the detonation wave reflection pressure sampling value corresponding to the detonation wave incident angle; Based on the sampling values ​​of each detonation wave incident angle and the corresponding sampling values ​​of detonation wave reflection pressure, a slow-varying coefficient is obtained, and then a calculation model of detonation wave reflection pressure is obtained; Based on the calculation model of detonation wave reflection pressure, the three-wave point trajectory of the detonation wave of the composite charge is obtained.

2. The method for determining three wave point trajectories according to claim 1, characterized in that: The conical partition (3) is a double-conical structure; one side of the composite charge structure charge column (5) is provided with a conical groove adapted to the conical partition (3) and fits with the curved surface of the cone on one side of the conical partition (3).

3. The method for determining three wave point trajectories according to claim 1, characterized in that: The composite charge module to be tested also includes two organic glass plates (6); the two organic glass plates (6) are respectively inserted into two square through holes provided in a fixing bracket (11), and a plurality of units to be tested arranged in sequence are fixed in the fixing bracket (11), and are fixed on the outside of the fixing bracket (11) by two bolts (15); One side of an organic glass plate is bonded to the composite charge structure column (5), and the other side is bonded to one side of the manganese copper high pressure sensors (7) of a plurality of units to be tested that are connected in sequence; one side of another organic glass plate is bonded to one side of the composite charge blocks (8) of a plurality of units to be tested that are connected in sequence.

4. The method for determining three wave point trajectories according to claim 1, characterized in that: The measurement module comprises a constant current source (10) and an oscilloscope (12); Each output end of the constant current source (10) is connected to one end of each manganese-copper high pressure sensor (7), and the input end is connected to the detonation module; Each input end of the oscilloscope (12) is connected to the other end of each manganese-copper high-pressure sensor (7) and is grounded to the ground end.

5. The method for determining three wave point trajectories according to claim 2, characterized in that: The detonation module comprises an electric detonator (1) and an outer layer of high-detonation-rate explosive (2); The outer layer of high-explosive-velocity explosive (2) is arranged on the surface of the other side of the cone of the cone partition (3), has a shape that matches the cone of the other side of the cone partition (3), and is provided with an opening at the top; the electric detonator (1) is arranged at the top opening of the outer layer of high-explosive-velocity explosive (2).

6. The method for determining three wave point trajectories according to claim 2, characterized in that: The composite charge block (8) meets the following conditions: ， In the formula, , Respectively represent the inner and outer radii of the composite charge block, represents the critical radius of stable detonation of explosives, , Respectively represent the inner and outer charge densities of the composite charge block, , Respectively represent the detonation velocity of the inner and outer layers of the composite charge, Indicates the height of the composite charge block.

7. The method for determining three wave point trajectories according to claim 1, characterized in that: The angle range of the top angle of the cone partition (3) on the central axis is ;in, is the critical angle of Mach reflection.

8. The method for determining three wave point trajectories according to claim 7, characterized in that: The calculation model of detonation wave reflection pressure is obtained by the following method: Based on the slow-varying coefficient, the detonation wave reflection pressure relationship is constructed; Input each detonation wave incident angle sampling value and the corresponding detonation wave reflection pressure sampling value into the detonation wave reflection pressure relationship formula to obtain each slow-varying coefficient calculation value; The average of the calculated values ​​of the slow-varying coefficients is taken as the slow-varying coefficient and substituted into the detonation wave reflection pressure relationship to obtain the detonation wave reflection pressure calculation model.

9. The method for determining three wave point trajectories according to claim 8, characterized in that: The three-wave point trajectory of the detonation wave of the composite charge is obtained by the following method: Based on the composite charge radius and the Mach reflection critical angle, the coordinates of the intersection of the x-axis in the coordinate system are determined, and used as the coordinates of the initial trajectory point of the three-wave point trajectory; wherein the origin in the coordinate system is the detonation position, the x-axis represents the propagation distance of the detonation wave along the flow direction, and the y-axis represents the propagation distance of the detonation wave perpendicular to the flow direction; Based on the coordinates of the initial trajectory points, the calculation model of the detonation wave reflection pressure, the set step size and the number of trajectory points, the coordinates of each trajectory point are obtained in turn; The coordinates of the initial trajectory point and the coordinates of each trajectory point are connected to obtain the three-wave point trajectory of the detonation wave of the composite charge.

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