Experimental device and method for preventing fire channeling of quadratic type cloud explosive bomb

Abstract

The invention relates to an experimental device and method for preventing a quadratic type cloud explosive bomb from fire channeling. The device comprises a cloud explosive bomb main body which is a hollow pipe containing central initiating explosive and cloud explosive fuel, an upper end opening is detachable, and a plurality of notch grooves are distributed in the inner side wall of the cloud explosive bomb main body. The central tube is filled with the porous material, the inert explosion suppression dust is uniformly dispersed in pores of the porous material, and explosion flame propagation of the central initiating explosive is inhibited under the combined action of the porous physical structure and the chemical explosion suppressant, so that the fire channeling phenomenon is prevented. The center initiating explosive is tightly connected with the detonator, and the detonator is fixed through a center initiating detonator plug. And the ignition delay system is used for controlling the initiation time sequence of the central primer detonator and the secondary primer detonator. The method can prevent the fire channeling phenomenon of the cloud explosive bomb, so that the damage power of the cloud explosive bomb is improved, and the method has the advantages of being simple in process, easy to operate, low in cost and suitable for batch production.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of secondary initiation cloud bomb, in particular to an experimental device and method for preventing secondary cloud bomb from fire running. BACKGROUND

[0002] Cloud bomb, also known as fuel-air explosive (FAE for short), is usually divided into primary initiation cloud bomb and secondary initiation cloud bomb. The secondary cloud bomb is dispersed in the air by the action force generated by the center charge explosion, and after the fuel is fully mixed with the air, the cloud is detonated under the action of the secondary initiation device, so as to achieve the purpose of damage. The ignition and combustion phenomenon occurring before the secondary initiation device is triggered during the fuel dispersion process is called fire running. The occurrence of fire running phenomenon causes part of the fuel to burn in advance, so that the cloud bomb cannot form stable detonation, which will greatly reduce the damage power of the cloud bomb. This is a key technical problem restricting the development of cloud bomb. SUMMARY

[0003] The purpose of the present application is to provide a device and method for preventing secondary cloud bomb from fire running, to solve the problems raised in the background art.

[0004] To achieve the above purpose, the present application provides the following technical scheme:

[0005] A device for preventing secondary cloud bomb from fire running, comprising:

[0006] A cloud bomb body, which is a cylindrical shell containing a center initiation explosive and a cloud bomb fuel, wherein the upper end port is a detachable circular flange cover, the inner side wall is symmetrically distributed with a plurality of grooves with a certain depth, so as to facilitate the fuel to be dispersed mainly in the horizontal direction after the center initiation explosive is initiated;

[0007] A cloud bomb body structure top cover, wherein the center is a circular hole with internal threads, the upper end flange cover outside is provided with a plurality of symmetric screw holes connected with the cloud bomb body, and a circular annular groove is provided to place a circular annular sealing ring;

[0008] A center tube structure shell for containing the center initiation explosive, which has external threads matched with the center of the upper end flange cover on the outside;

[0009] A porous material, which is in close contact with the inside of the center tube structure shell and fills the inside of the center tube structure shell;

[0010] Further, the inert explosion-suppressing dust is uniformly dispersed in the pores of the porous material, and the honeycomb structure of the porous material and the inert explosion-suppressing dust together suppress the flame propagation after the explosion of the central initiating explosive, so as to prevent the occurrence of the fire spreading phenomenon and improve the initiation reliability of the cloud explosion bomb warhead.

[0011] The central initiating explosive is in a cylindrical shape, and is located at the center of the porous explosion-suppressing material and connected with the detonator at the upper part.

[0012] Further, the detonator is tightly inserted into the groove reserved at the upper end of the central initiating explosive, and is externally sleeved with a hollow cylindrical detonator plug, so as to fix the shape of the detonator and make the central axis of the detonator coincide with the central axis of the initiating explosive.

[0013] The cloud explosion fuel can be filled with gas, liquid and solid state fuels and their mixtures, and is usually mainly in the form of liquid-solid composite fuel.

[0014] Another object of the present application is to provide a cloud explosion bomb anti-fire spreading method based on the above-mentioned cloud explosion bomb anti-fire spreading device.

[0015] S1, filling a certain amount of cloud explosion fuel in the cloud explosion bomb shell;

[0016] S2, uniformly dispersing a certain amount of inert explosion-suppressing dust particles in the pores of the porous material by mechanical oscillation;

[0017] S3, placing the cylindrical central initiating explosive in the groove reserved in the porous material;

[0018] S4, filling the porous material loaded with the central initiating explosive in the central tube structure shell;

[0019] S5, inserting the detonator into the hole sleeved with the detonator plug, so as to tightly contact the central initiating explosive;

[0020] S6, fixing the secondary initiating explosive column sleeved with the detonator on the wooden board at a certain horizontal distance from the main structure of the cloud explosion bomb, and preferably, the geometric center distance from the ground height should be consistent with the geometric center distance from the ground height of the main structure of the cloud explosion bomb;

[0021] S6, in order to ensure the safe operation in the test process, the central initiating detonator and the secondary initiating detonator should be short-circuited before initiation. When the test is formally started, the central initiating detonator and the secondary initiating detonator are connected to the two output circuits of the delay igniter, and then the central initiating detonator is set to 0 time, and the secondary initiating detonator ignites the secondary initiating explosive column after a delay of several milliseconds, so as to cause the cloud cluster to occur cloud explosion.

[0022] Further, the delay time of the secondary detonation detonator should be determined according to the optimal detonation volume concentration of the selected fuel, and the cloud volume concentration at a certain time is generally estimated according to the mass ratio of the fuel and the volume of the cloud, and the delay time of the secondary detonation detonator is generally set to 40-60 ms.

[0023] Based on the experimental device for preventing the secondary cloud bomb from fire jumping, in the specific implementation method of the present application, the porous material can be polyurethane foam, aluminum alloy foam, porous ceramic, net-shaped aluminum alloy and the like, and a certain amount of inert explosion suppression dust particles, such as sodium bicarbonate, sodium chloride, sodium dihydrogen phosphate, ammonium dihydrogen phosphate, calcium carbonate, diatomite, talc, kaolin and the like, are uniformly dispersed in the porous material. The present application simultaneously considers the inhibition effect of both physical structure and chemical explosion suppression agent on explosion flame, and under the coupling effect of both, the occurrence probability of cloud bomb fire jumping can be effectively reduced, thereby improving the reliability of the cloud explosion effect of the cloud bomb. The coupling effect of the porous material and the inert explosion suppression dust can effectively reduce the occurrence probability of cloud bomb fire jumping, thereby improving the reliability of the cloud explosion effect of the cloud bomb. The mechanism of the coupling effect of the porous material and the inert explosion suppression dust in inhibiting the propagation of the explosion flame of the central initiation explosive and high temperature lies in: 1) physical barrier effect: the structure of the porous material can block and disperse the propagation path of the flame, reduce the energy of the flame front and reduce the burning speed. At the same time, the barrier layer formed by the inert explosion suppression dust at the flame front can also absorb part of the explosion energy, further slowing down the flame propagation. 2) heat absorption and dissipation: the porous material and the inert dust have high specific heat capacity and high thermal conductivity, which can absorb the heat generated by the explosion and reduce the combustion temperature. At the same time, the structure of these materials can quickly dissipate heat to the surrounding environment, reducing the risk of local overheating. 3) inhibition of chemical reaction: the inert explosion suppression dust can react with active free radicals generated by combustion to generate inactive or low-activity products, inhibit the chain process of the combustion reaction and reduce the propagation rate of the flame. 4) blocking of reactant mixing: the structure of the porous material and the presence of the inert dust can prevent or slow down the effective mixing of the reactants (such as gaseous fuel and oxygen), reducing the driving force of the flame propagation. Compared with the flame-retardant barrier layer used in the prior art, the inert explosion suppression dust used in the present application has a lower content and does not significantly reduce the detonation power of the cloud bomb. At the same time, the method for preventing cloud bomb fire jumping proposed in the present application is simple in process, easy to operate, low in cost and convenient for mass production. BRIEF DESCRIPTION OF DRAWINGS

[0024] Fig. 1 is a schematic diagram of the overall structure of the present application;

[0025] Fig. 2 is a schematic diagram of the internal main body structure of the cloud bomb of the present application;

[0026] Fig. 3 is a schematic diagram of the cloud bomb shell of the present application;

[0027] Fig. 4 is a schematic diagram of the distribution relationship between the porous material and the inert explosion suppression dust.

[0028] In the figure: 101, center tube; 100, center tube top cover center small hole; 10, center tube top screw; 11, center tube top nut; 12, center tube top cover; 13, center tube structure shell; 14, center initiation detonator; 15, center initiation detonator plug; 16, center tube outside external thread; 17, center initiation powder column; 18, porous material; 19, inert explosion suppression dust; 201, cloud burst bomb body; 202, cloud burst bomb body structure support; 20, cloud burst bomb body structure top cover screw; 21, cloud burst bomb body structure top cover nut; 22, cloud burst bomb body structure top cover; 23, cloud burst bomb body structure shell; 24, cloud burst bomb body structure top O-ring; 25, cloud burst fuel; 26, cloud burst bomb body structure shell inside prefabricated groove; 301, secondary initiation device; 300, cable tie; 30, secondary initiation powder column fixed wood plate; 31, secondary initiation detonator; 32, secondary initiation detonator plug; 33, secondary initiation powder column; 34, center initiation lead; 35, secondary initiation lead; 401, ignition delay system; 40, ignition delay device; 41, ignition delay device channel one; 42, ignition delay device channel two. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0030] Please refer to Figs. 1-4 , an experimental device and method for preventing secondary cloud burst bomb from fire running are provided to solve the fire running failure easily occurred by the traditional secondary cloud burst bomb, and in the case that the center tube is filled with certain inert explosion suppression dust, the damage power is not affected, thereby the cloud burst bomb cloud explosion detonation action reliability can be better improved, data reference is provided for related theoretical calculation and numerical simulation research, and reference basis is provided for damage power and reliability improvement of the cloud burst bomb.

[0031] The application provides an experimental device for preventing secondary cloud explosion bomb from fire running, which comprises a cloud explosion bomb body 201, a center tube 101 is arranged in the cloud explosion bomb body 201, the center tube 101 is located at the center position of the horizontal section of the cloud explosion bomb body 201, the center tube 101 is connected with an ignition delay system 401, the ignition delay system 401 is connected with a secondary initiation device 301, and the experimental device further comprises: a porous material 18, the porous material 18 is in close contact with the inside of the center tube 101 and fills the inside of the center tube 101; a center initiation explosive 17, which is located at the center of the porous material 18 and is connected with a center initiation detonator 14 at the upper portion; the upper end of the center initiation explosive column 17 is connected with a center initiation detonator plug 15 in a close mode, and the center initiation detonator plug 15 is used for fixing the center initiation detonator 14; inert explosion suppression dust 19, which is uniformly dispersed in the pores of the porous material 18 and can suppress the flame propagation after the explosion of the center initiation explosive 17; cloud explosion fuel 25, which fills the rest of the center tube 101; and the opening at the upper end of the center tube 101 is sealed by tightly connecting a center tube top cover 12 with a center tube structure shell 13 through a center tube top screw 10 and a center tube top nut 11.

[0032] The porous material 18 is polyurethane foam, aluminum alloy foam, porous ceramic or reticular aluminum alloy. The inert explosion suppression dust 19 is at least one of sodium bicarbonate, sodium chloride, sodium dihydrogen phosphate, ammonium dihydrogen phosphate, calcium carbonate, diatomite, talcum powder and kaolin.

[0033] The ignition delay system 401, including the ignition delay device 40, the ignition delay device channel 41, 42, the central detonation lead 34 and the secondary detonation lead 35, is used to control the response time of the central detonation device 14 and the secondary detonation device 31. The central detonation device 14 is inserted into the groove reserved at the upper end of the central detonation charge 17, and is externally sleeved with the hollow cylindrical central detonation device plug 15 to fix the shape of the detonation device, so that the central axis of the central detonation device 14 coincides with the central axis of the central detonation charge 17, and the lead of the central detonation device 14 is led out through the central small hole 100 of the top cover of the central tube. The cylindrical shell containing the central detonation charge column 17 and the cloud explosion fuel 25 in the cloud explosion bomb body 201 is the central tube 101, and the upper end port is the detachable circular flange cover, i.e. the top cover 22 of the cloud explosion bomb body structure, the internal side wall surface, i.e. the shell 23 of the cloud explosion bomb body structure, is symmetrically distributed with a plurality of grooves 26 with a certain depth, which facilitates the dispersion of the fuel in the horizontal direction after the central detonation charge 17 is detonated. The center of the cloud explosion bomb body structure top cover 22 is a circular hole with an internal thread reserved, the upper end flange cover outside is left with a plurality of symmetric screw holes 20 connected with the cloud explosion bomb body, and a circular annular groove is left to place the cloud explosion bomb body structure top O-shaped sealing ring 24, the sealing of the cloud explosion bomb body 201 is realized by the close connection of the cloud explosion bomb body structure top cover screw 20 and the cloud explosion bomb body structure top cover nut 21, and the cloud explosion bomb body 201 is located on the upper part of the cloud explosion bomb body structure support 202. The outer side of the shell of the central tube 101 is provided with the central tube external external thread 16 matched with the upper end flange cover.

[0034] Example 1

[0035] The present application includes the following parts: the central tube 101, the cloud explosion bomb body 201, the secondary detonation device 301, and the ignition delay system 401.

[0036] Specifically, the central tube 101 is a hollow tube with an open upper port and a closed lower port, and the inside of the tube is sequentially provided with the porous material 18, the porous material is internally dispersed with a certain amount of inert explosion suppression dust 19, further, the porous material 18 is composed of two internally hollow half-cylinders with their central axes cut open, the internal hollow part is filled with the central detonation charge column 17, the upper end of the central detonation charge column is closely connected with the central detonation device plug 15, the central detonation device plug 15 is used to fix the central detonation device 14, the opening sealing of the upper end of the central tube is realized by tightly connecting the central tube top cover 12 with the central tube structure shell 13 through the central tube top screw 10 and the central tube top nut 11, and the lead of the central detonation device 14 is led out through the central small hole 100 of the central tube top cover.

[0037] The cloud explosion bomb body 201 is a hollow container with an open upper port and a closed lower port, which includes a central tube 101 inside and is fixed by connecting the central hole of the cloud explosion bomb body structure top cover 22 to the outer thread 16 outside the central tube. The remaining space is used to fill the cloud explosion fuel 25. The upper opening is sealed by the cloud explosion bomb body structure top cover 22, the cloud explosion bomb body structure top cover screw 20, the cloud explosion bomb body structure top cover nut 21, the cloud explosion bomb body structure shell 23, and the cloud explosion bomb body structure top O-ring 24. The pre-fabricated groove 26 inside the cloud explosion bomb body structure shell is designed to disperse the cloud explosion fuel in the preset horizontal direction and ensure uniformity of the concentration. The cloud explosion bomb body structure support 202 is used to support the cloud explosion bomb body. Preferably, the support height is close to the ground when the cloud is at the optimal concentration, and generally plastic products are selected to save test costs.

[0038] The secondary initiation device 301 is used to fix the secondary initiation explosive column 33. The secondary initiation explosive column is bound to the secondary initiation explosive column fixing board 30 by the binding tape 300. The upper end of the secondary initiation explosive column is connected to the secondary initiation detonator plug 32, and the center of the secondary initiation detonator plug is inserted into the secondary initiation detonator 31.

[0039] The ignition delay system 401 is composed of an ignition delay device 40, an ignition delay device channel one 41, an ignition delay device channel two 42, a central initiation lead 34, and a secondary initiation lead 35. The ignition delay system 401 is connected to the central tube 101, the central initiation detonator (14) of the secondary initiation device 301, and the secondary initiation detonator (31) through the leads 34 and 35, respectively. The response of the central initiation detonator 14 and the secondary initiation detonator 31 is controlled by adjusting the delay time.

[0040] The method for preventing the secondary cloud explosion bomb from chasing fire is as follows:

[0041] S1, a certain amount of cloud explosion fuel 25 is filled in the cloud explosion bomb shell 201;

[0042] S2, a certain amount of inert explosion suppression dust 19 particles are uniformly dispersed in the pores of the porous material 18 by mechanical oscillation;

[0043] S3, the cylindrical central initiation explosive 17 is placed in the groove reserved in the porous material 18;

[0044] S4, the porous material 18 loaded with the central initiation explosive 17 is filled in the central tube structure shell 13;

[0045] S5, the detonator 14 is inserted into the hole with the central initiation detonator plug 15, so that it is in close contact with the central initiation explosive 17;

[0046] S6, the secondary initiation of the explosive column 33 with the center initiation detonator 14 is fixed on the secondary initiation explosive column fixed board 30 at a certain distance from the main body structure 201 of the cloud bomb, and the geometric center distance from the ground height should be consistent with the geometric center distance from the ground height of the main body structure of the cloud bomb;

[0047] S7, the center initiation detonator 14 and the secondary initiation detonator 31 should be short-circuited before initiation. When the test starts formally, the center initiation detonator 14 and the secondary initiation detonator 31 are connected to the two output circuits of the delay igniter 40, and then the center initiation detonator 14 is set to 0 time, and the secondary initiation detonator 31 explodes the secondary initiation explosive column 33 after a delay of several milliseconds.

[0048] The temperature of the explosion flame of the center initiation explosive is inhibited by the coupling effect of the porous material 18 and the inert explosion suppression dust 19, and then the propagation of the explosion flame is inhibited, so as to prevent the occurrence of the cloud bomb fire spreading phenomenon; the delay time of the secondary initiation detonator 31 is determined according to the optimal detonation volume concentration of the selected fuel, and the delay time is 40 ms to 60 ms.

[0049] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An experimental device for preventing secondary thermobaric bomb flare-up, comprising a thermobaric bomb body (201) and a central tube (101) therein, characterized in that, The central tube (101) is located at the center of the horizontal cross-section of the thermobaric bomb body (201). The central tube (101) is connected to the ignition delay system (401), and the ignition delay system (401) is connected to the secondary detonation device (301). It also includes: The porous material (18) is in close contact with the interior of the central tube (101) and fills the interior of the central tube (101); The central detonator (17) is located at the center of the porous material (18), and the upper part of the central detonator (17) is connected to the central detonator (14); the upper end of the central detonator column (17) is tightly connected to the central detonator plug (15), and the central detonator plug (15) is used to fix the central detonator (14). Inert explosion suppressant dust (19) is uniformly dispersed in the pores of porous material (18) and can suppress the flame propagation after the explosion of the central detonator (17); The remaining parts of the central tube (101) are filled with thermobaric fuel (25); The opening at the upper end of the central tube (101) is sealed by tightly connecting the top cap (12) of the central tube to the central tube structural housing (13) through the top screw (10) and the top nut (11) of the central tube.

2. The experimental apparatus according to claim 1, characterized in that, The porous material (18) is polyurethane foam, aluminum alloy foam, porous ceramic or mesh aluminum alloy.

3. The experimental apparatus according to claim 1, characterized in that, The inert explosion-suppressing dust (19) is at least one of sodium bicarbonate, sodium chloride, sodium dihydrogen phosphate, ammonium dihydrogen phosphate, calcium carbonate, diatomaceous earth, talc, and kaolin.

4. The experimental apparatus according to claim 1, characterized in that, The ignition delay system (401) includes an ignition delayer (40), ignition delayer channels (41, 42), a central detonation wire (34), and a secondary detonation wire (35) for controlling the response time of the central detonator (14) and the secondary detonator (31).

5. The experimental apparatus according to claim 1, characterized in that, The central detonator (14) is inserted into the groove reserved at the upper end of the central detonator (17), and a hollow cylindrical central detonator plug (15) is fitted on the outside to fix the shape of the detonator so that its central axis coincides with the central axis of the central detonator (17). The wire of the central detonator (14) is led out through the small hole (100) at the top of the central tube.

6. The experimental apparatus according to claim 1, characterized in that, The thermobaric bomb body (201) contains a cylindrical shell, namely the central tube (101), which contains a central detonating charge (17) and thermobaric fuel (25). The upper end is a detachable circular flange cover, namely the top cover (22) of the thermobaric bomb body structure. The inner side wall, namely the thermobaric bomb body structure shell (23), has several grooves (26) of a certain depth symmetrically distributed to facilitate the horizontal dispersion of fuel after the central detonating charge (17) is detonated.

7. The experimental apparatus according to claim 1, characterized in that, The top cover (22) of the thermobaric bomb body structure has a circular hole with internal threads in the center. The outer side of the upper flange cover has multiple symmetrical screw holes (20) for connecting with the thermobaric bomb body, and a circular groove for placing the O-ring seal (24) on the top of the thermobaric bomb body structure. The sealing of the thermobaric bomb body (201) is achieved by the tight connection between the top cover screw (20) and the top cover nut (21) of the thermobaric bomb body structure. The thermobaric bomb body (201) is located on the upper part of the thermobaric bomb body structure support (202).

8. The experimental apparatus according to claim 1, characterized in that, The outer side of the central tube (101) housing is provided with an external thread (16) for holding the central detonator (17) and matching the center of the upper flange cover.

9. A method for preventing fire spread based on the secondary thermobaric bomb fire prevention device according to any one of claims 1 to 8, comprising the following steps: S1. A certain amount of thermobaric fuel (25) is filled into the thermobaric bomb casing (201); S2. A certain amount of inert explosion-suppressing dust (19) particles are uniformly dispersed in the pores of porous material (18) by mechanical vibration. S3. Place the cylindrical central detonator (17) into the groove reserved inside the porous material (18); S4. Fill the central tube structure shell (13) with porous material (18) containing the central detonator (17); S5. Insert the detonator (14) into the hole fitted with the center detonator plug (15) so that it is in close contact with the center detonating charge (17). S6. The secondary detonating charge (33) fitted with the central detonator (14) is fixed to the secondary detonating charge fixing wooden board (30) at a certain distance from the main structure (201) of the thermobaric bomb by cable ties (300). The height of the geometric center of the secondary detonating charge (33) from the ground should be consistent with the height of the geometric center of the main structure of the thermobaric bomb from the ground. S7. Before detonation, the wires on the central detonator (14) and the secondary detonator (31) should be short-circuited and inserted into the central detonator plug (15) and the secondary detonator plug (32) respectively for fixation. When the test is officially started, the central detonator (14) and the secondary detonator (31) are connected to the two output circuits of the delay igniter (40) through wires (34, 35) respectively. Then, the central detonator (14) is set to 0. After a delay of several milliseconds, the secondary detonator (31) detonates the secondary detonating charge (33).

10. The fire prevention method according to claim 9, characterized in that, The temperature of the central detonator's explosion flame is suppressed by the coupling effect of porous material (18) and inert explosion suppressing dust (19), thereby suppressing the propagation of the explosion flame and preventing the occurrence of the thermobaric bomb's fire propagation phenomenon; the delay time of the secondary detonator (31) is determined according to the optimal detonation volume concentration of the selected fuel, and the delay time is 40ms to 60ms.

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