Explosive deepwater explosion bubble energy output characteristic test method and test device

Abstract

The invention relates to an explosive deepwater explosion bubble energy output characteristic test method and a test device. Technical means and research basis are provided for explosive deepwater explosion power measurement and evaluation. The method is suitable for testing, evaluating and testing explosives for simulating deepwater application in a pressure container, a plurality of calibration tests are firstly carried out, a plurality of formal tests are carried out after the calibration tests are completed, data of the formal tests are obtained and processed, and a multi-parameter composite correction mode is adopted to obtain a multi-parameter composite correction model. The influence of complex boundary conditions on explosive deepwater explosion energy output characteristics is weakened, and the problem that explosive deepwater explosion ratio bubbles can be corrected in a standardized mode is solved.

Description

Technical Field

[0001] The invention relates to the field of underwater test and testing technology, in particular to a test method and a test device for energy output characteristics of explosive deep-water explosion bubbles. Background Art

[0002] The test on energy output characteristics of explosives in deep water is mainly used to test the explosion energy output composition of shock wave energy and bubble energy of underwater explosion of explosives.

[0003] The energy output characteristics of the bubbles in the deepwater explosion of explosives are part of the test, which focuses on the energy output of the bubbles in the explosives. Energy output tests are an important part of conventional explosive testing, finalization, and evaluation tests. At present, the energy output characteristics of underwater explosions of explosives are all based on the results of shallow water explosion tests. However, as the demand for deepwater engineering applications becomes more urgent, the energy output characteristics of deepwater explosions of explosives are receiving more and more attention.

[0004] As an ideal place to simulate deep-sea environment in the test room, the pressurized container can effectively increase the test scope of deep-water explosion by adjusting the test conditions and laying out the wall absorbing layer. However, due to the objective existence of the boundary, the relevant influence cannot be completely eliminated. The method of using TNT with a considerable amount of charge as a calibration object to correct the bubble energy in shallow water cannot eliminate the nonlinear influence of the boundary effect on the bubble. The shock wave energy is basically not affected by the pressure vessel boundary, and the existing correction method is difficult to meet the needs of deep-water measurement. Summary of the invention

[0005] In view of the shortcomings in the above-mentioned existing production technology, the applicant provides a rationally structured test method and test device for the energy output characteristics of deep-water explosion bubbles of explosives, which provides technical means and research basis for measuring and evaluating the deep-water explosion power of explosives in a multi-parameter composite correction manner.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A method for testing the energy output characteristics of explosive deepwater explosion bubbles is applicable to testing and evaluating explosives used in simulated deepwater applications in pressure vessels, and comprises the following steps:

[0008] Carry out several calibration tests.

[0009] After the calibration test is completed, several formal tests are carried out to obtain the data of the formal tests and process the obtained deep-water explosion energy output characteristic data.

[0010] S1: Environmental nonlinear factor fitting,

[0011] The bubble pulsation period of TNT explosives was determined by high-speed camera data and pressure time history curves, and the influence of the boundary on the bubble was converted into η using multiple groups of bubble pulsation periods.i coefficient,

[0012] S2: Calculation of TNT equivalent of equivalent bubbles in pressure vessels,

[0013] According to the bubble pulsation period of the explosive to be tested, the equivalent bubble TNT equivalent m1 of the explosive to be tested in the pressure vessel in deep water is calculated.

[0014] S3: Correction of bubbles,

[0015] Obtain specific bubble energy correction; correct the specific bubble energy of the explosive to be tested according to the specific bubble energy correction value.

[0016] S4: TNT equivalent conversion of the explosive to be tested,

[0017] According to the specific bubble energy of the explosive to be tested, the TNT bubble energy equivalent of the explosive to be tested is obtained by comparing it with the obtained calibration TNT specific bubble energy.

[0018] The specific calculation process of S1 is:

[0019] The bubble pulsation period of various calibrated TNT explosives is comprehensively determined by using high-speed camera data and measured pressure time history curves.

[0020] Using the bubble pulsation periods of four different masses of TNT explosives, the influence of the boundary on the bubble is converted into η by fitting the following formula: i In the coefficient,

[0021] T bi =η1W i 13 +η2W i 23 ,

[0022] Where, T bi Each calibration TNT explosive bubble pulsation period, W i is the mass of each calibrated TNT explosive.

[0023] The specific calculation process of S3 is as follows: The specific bubble energy correction is obtained by the following formula:

[0024]

[0025] Where T1 is the bubble pulsation period of the explosive to be tested.

[0026] The specific bubble energy of the explosive to be tested is corrected to:

[0027]

[0028] The specific operation steps of the calibration test phase are:

[0029] Select several groups of TNT explosives for calibration, the explosives mass is a geometric progression,

[0030] Connect the TNT explosive package and the detonator, and use the detonating wire to lay the explosives.

[0031] Seal the explosive placement hole.

[0032] The environment where the explosives are located is pressurized to the environmental pressure required for the formal test, and the external measurement system is started at the same time. The test status is confirmed by a high-speed camera. After confirming that it is normal, the trigger mode is used to synchronize the high-speed photography and pressure measurement system.

[0033] Detonate explosives, complete the collection and storage of high-speed photography and pressure measurement data,

[0034] After pressure relief, carry out the next calibration test until all calibration tests are completed.

[0035] The specific steps of the formal test are as follows:

[0036] Connect the explosive package to be tested with the detonator and use the detonating wire to lay the explosives.

[0037] Close the explosive placement hole, pressurize the environment where the explosives are located to the environmental pressure required for the formal test, and start the measurement system at the same time. Use a high-speed camera to confirm the test status. After confirming that it is normal, use the trigger mode to synchronize the high-speed camera and the measurement system.

[0038] Detonate explosives, complete the collection and storage of high-speed photography and pressure measurement data,

[0039] After pressure relief, conduct the next shot test until all formal test conditions are completed.

[0040] A test device suitable for a test method of energy output characteristics of bubbles of explosive deep-water explosion comprises a pressure tank, in which a sensor placement bracket is arranged; the sensor placement bracket is provided with a plurality of pressure measuring sensors and adapters, and the pressure measuring sensors are connected to a measuring system; an observation platform is also arranged on the pressure tank, and a high-speed camera for observing underwater bubble pulsation is arranged on the observation platform.

[0041] Water is pumped into the pressure tank and pressurized to simulate a deep-water environment.

[0042] The beneficial effects of the present invention are as follows:

[0043] The present invention proposes a test method for the energy output characteristics of bubbles of explosives in deep water explosions in pressure vessels. Aiming at the influence of complex boundary conditions in pressure vessels on the energy output characteristics of explosives in deep water explosions, especially the influence of bubble energy, a multi-parameter composite correction method is proposed to solve the problem of standardized correction of specific bubble energy of explosives in deep water explosions. It provides an important technical means for the testing and evaluation of deep water explosives. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a flowchart of the present invention.

[0045] Figure 2 It is a schematic diagram of the arrangement of the pressure tank test environment of the present invention.

[0046] Figure 3 It is the pressure-time curve of the explosive to be tested at a typical explosion distance.

[0047] Among them: 1. Pressure sensor; 2. Sensor bracket; 3. Explosives; 4. Laying rope; 5. Detonating wire; 6. Measuring wire; 7. Explosive hole; 8. Watertight joint; 9. Detonator; 10. Measuring system; 11. High-speed camera; 12. Observation window; 13. Observation platform. DETAILED DESCRIPTION

[0048] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0049] The test of the present application calculates and corrects the explosion data by performing underwater explosion, thereby obtaining the energy equivalent of the three bubbles of explosive.

[0050] Combined with reference Figure 1 The first stage is the test preparation stage. Before the test, the test equipment is arranged first.

[0051] In order to measure the energy output characteristics of the deep-water explosion of explosive 3, the underwater explosion pressure measurement sensor selected has good impact resistance and high-pressure watertightness, and the adapter and sensor are matched. The recorder uses a high-speed signal acquisition instrument with a continuous sampling box pre-trigger function.

[0052] The pressure sensor 1 is placed on the pressure sensor 1 bracket through a clamp, and one end of the sensor measuring wire 6 is led out from the watertight joint 8 of the pressure tank cover to facilitate the connection to the measurement system 10. In order to observe the bubble pulsation process of the explosive 3, a high-speed camera 11 is arranged on the pressure tank observation platform 13.

[0053] The pressure sensor 1 is placed on the sensor bracket 2 through a clamp, and one end of the sensor measuring wire 6 is led out from the watertight joint 8 of the pressure tank cover, which is convenient for connecting the measuring instrument and the computer.

[0054] A high-speed camera 11 is arranged on the pressure tank observation platform 13 to observe the bubble pulsation of the explosive 3 through the pressure tank observation window 12 .

[0055] The sensor bracket 2 is placed in the pressure tank through the placement rope 4. After the placement is completed, the pressure tank is prepared, pre-watered, and supplemented with high-pressure gas tank gas source.

[0056] After completing the above work, the water level of the pressure tank is raised to the position of the medicine release hole 7 of the pressure tank.

[0057] The second stage is the calibration test stage.

[0058] In one embodiment, the mass of the tested explosive 3 is 180 g, so the calibrated masses of the TNT explosive 3 are selected as: 50 g, 100 g, 200 g, and 500 g.

[0059] Connect each calibrated TNT explosive 3 package to the detonator, use the detonating wire 5 to lay the explosive 3, and close the charge hole 7. Pressurize the environment where the explosive 3 is located to the environmental pressure required by the formal test, start the measuring instrument and computer at the same time, and use the high-speed camera 11 to confirm the test status; after confirming that it is normal, use the trigger mode to synchronize the high-speed camera 11 with the external measurement system 10.

[0060] The explosive 3 is detonated by the detonator 9 to complete the collection and storage of high-speed photography and pressure measurement data. After the pressure is released, the next calibration shot test is carried out until all calibration tests are completed.

[0061] After the calibration test is completed, the third phase of formal testing will be carried out.

[0062] The explosive 3 to be tested is connected to the detonator, the explosive 3 to be tested is laid out using the detonating wire 5, and the charge hole 7 is closed. The environment where the explosive 3 is located is pressurized to the environmental pressure required for the formal test, and the measurement system 10 is started at the same time, and the test status is confirmed using the high-speed camera 11. After the above steps are confirmed to be normal, the high-speed photography and pressure measurement system 10 are synchronized using the trigger mode.

[0063] Detonate explosive 3 and complete the collection and storage of high-speed photography and pressure measurement data.

[0064] After pressure relief, conduct the next shot test until all formal test conditions are completed.

[0065] The fourth stage is the data processing stage, which integrates and processes the data from the deepwater explosion energy output characteristic test.

[0066] The first step is to fit the environmental nonlinear factors.

[0067] Taking into account that underwater explosion loads in pressure vessels are rich in influences and bubble pulsation periods are difficult to determine, the present invention utilizes high-speed camera data and measured pressure time-history curves to comprehensively determine the bubble pulsation periods of various calibrated TNT explosives.

[0068] Using the bubble pulsation periods of four different masses of TNT explosives, the influence of the boundary on the bubble is converted into η by fitting the following formula: i The coefficient is medium.

[0069] T bi =η1W i 13 +η2W i 23

[0070] Where, T bi is the bubble pulsation period of each calibrated TNT explosive, W i is the mass of each calibrated TNT explosive.

[0071] The second step is to calculate the TNT equivalent of the equivalent bubbles in the pressure vessel.

[0072] Substitute the bubble pulsation period T1 of the explosive to be tested into the above formula, and obtain the deep-water explosion equivalent bubble TNT equivalent m1 of the explosive to be tested in the pressure vessel according to the above formula.

[0073] The third step is to correct the bubble energy.

[0074] Based on the above steps, the specific bubble energy correction is obtained according to the following formula:

[0075]

[0076] Where T1 is the bubble pulsation period of the explosive to be tested.

[0077] The specific bubble energy of the explosive to be tested is corrected to:

[0078]

[0079] Where m is the mass of the explosive to be tested.

[0080] The fourth step is to convert the TNT equivalent of the explosive to be tested.

[0081] On the basis of the specific bubble energy obtained above, the TNT bubble energy equivalent of the explosive to be tested is obtained by comparing the specific bubble energy of TNT used for calibration.

[0082] The following table shows the test results of deep water explosion energy output characteristics of the explosives to be tested.

[0083]

[0084] The purpose of the present invention is to provide a method for obtaining a standardized correction of the specific bubble energy of explosives in deep water explosion, so as to meet the needs of deep water measurement.

[0085] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any form of modification may be made within the scope of protection of the present invention.

Claims

1. A method for testing the energy output characteristics of explosive deep-water explosion bubbles, characterized in that: Applicable to the testing and evaluation of simulated deepwater explosives in pressure vessels, including the following steps: Carry out several calibration tests. After the calibration test is completed, several formal tests are carried out to obtain the data of the formal tests. Process the acquired deepwater explosion energy output characteristic data, S1: Environmental nonlinear factor fitting, The bubble pulsation period of TNT explosives is determined by high-speed camera data and pressure time history curve. The influence of the boundary on the bubble is converted into η using multiple sets of bubble pulsation periods. i coefficient, S2: Calculation of TNT equivalent of equivalent bubbles in pressure vessels, According to the bubble pulsation period of the explosive to be tested, the equivalent bubble TNT equivalent m1 of the explosive to be tested in the pressure vessel in deep water is calculated. S3: Correction of bubble energy, Obtain specific bubble energy correction; correct the specific bubble energy of the explosive to be tested according to the specific bubble energy correction value. S4: Conversion of TNT equivalent of the explosive to be tested, According to the specific bubble energy of the explosive to be tested, the TNT bubble energy equivalent of the explosive to be tested is obtained by comparing it with the obtained calibration TNT specific bubble energy.

2. The explosive deep water explosion bubble energy output characteristic test method as claimed in claim 1, characterized in that, The specific calculation process of S1 is: The bubble pulsation period of various calibrated TNT explosives is comprehensively determined by using high-speed camera data and measured pressure time history curves. Using the bubble pulsation periods of four different masses of TNT explosives, the influence of the boundary on the bubble is converted into η by fitting the following formula: i In the coefficient, Where, T bi Each calibration TNT explosive bubble pulsation period, W i is the mass of each calibrated TNT explosive.

3. The explosive deep water explosion bubble energy output characteristic test method as claimed in claim 1, characterized in that, The specific calculation process of S3 is as follows: The specific bubble energy correction is obtained by the following formula: Where T1 is the bubble pulsation period of the explosive to be tested.

4. The explosive deep water explosion bubble energy output characteristic test method as claimed in claim 3, characterized in that, The specific bubble energy of the explosive to be tested is corrected to:

5. The method for testing the energy output characteristics of deep water explosion bubbles of explosive (3) as claimed in claim 1, characterized in that: The specific operation steps of the calibration test phase are: Select several groups of TNT explosives (3) for calibration, the mass of explosives (3) is a geometric progression, Connect the TNT explosive (3) bag to the detonator, and use the detonating wire (5) to lay the explosive (3). Seal the explosive (3) placement hole, The environment where the explosive (3) is located is pressurized to the environmental pressure required by the formal test, and the external measurement system (10) is started at the same time. The test state is confirmed by using a high-speed camera (11). After confirming that it is normal, the high-speed camera and the pressure measurement system (10) are synchronized using a trigger mode. detonating explosives (3), completing the collection and storage of high-speed photography and pressure measurement data, After pressure relief, carry out the next calibration test until all calibration tests are completed.

6. The method for testing the energy output characteristics of deep water explosion bubbles of explosive (3) as claimed in claim 1, characterized in that: The specific steps of the formal test are as follows: The explosive (3) to be tested is connected to the detonator, and the explosive (3) is placed using the detonating wire (5). The explosive (3) placement hole is closed, the environment of the explosive (3) is pressurized to the environmental pressure required for the formal test, and the measurement system (10) is started at the same time. The test state is confirmed by using a high-speed camera (11). After confirming that it is normal, the high-speed camera (11) and the measurement system (10) are synchronized by using a trigger mode. detonating explosives (3), completing the collection and storage of high-speed photography and pressure measurement data, After pressure relief, conduct the next shot test until all formal test conditions are completed.

7. A test device suitable for the test method of deep water explosion bubble energy output characteristics of the explosive (3) according to claim 1, characterized in that: The invention comprises a pressure tank, in which a sensor placement bracket is arranged; a plurality of pressure measuring sensors and adapters are arranged on the sensor placement bracket, and the pressure measuring sensors are connected to a measuring system (10); an observation platform (13) is also arranged on the pressure tank, and a high-speed camera (11) for observing underwater bubble pulsation is arranged on the observation platform (13).

8. The test device according to claim 7, characterized in that Water is pumped into the pressure tank and pressurized to simulate a deep-water environment.

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