Explosion load simulation test device, system and method

Abstract

The invention discloses an explosion load simulation test device, system and method, and belongs to the technical field of explosion tests. The device comprises a driving section and a driven section, the driving section comprises a test pipeline which is used for guiding and accommodating methane-air mixed gas and deflagration products, a plurality of through holes which can be sealed by bolts are formed in the test pipeline, an obstacle partition plate and a polyethylene film are arranged in the test pipeline, and the polyethylene film is used for forming an inflation section; the driven section comprises an expansion section, a straight section and a structural section which are connected in sequence, the first end of the expansion section is connected with the test pipeline and used for diffusing shock waves generated by detonation, and the two ends of the straight section are connected with the second end of the expansion section and the structural section respectively and used for completing shaping of the blast load and improving the uniformity of blast load distribution on the structural section; and the structural section is used for bearing explosion load driven by detonation of methane and air mixed gas. According to the invention, the methane-air mixed gas is used as an explosion source, so that the test safety is improved, and the test cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of explosion testing, and in particular relates to an explosion load simulation test device, system and method. Background Art

[0002] Explosive load simulation test devices, such as shock tubes and explosive tubes, are primarily used to test the damaging effects of weapons and equipment, engineering structures, and personnel. Existing explosion sources typically use TNT detonation, pure oxygen deflagration / detonation with flammable gases (such as hydrogen, acetylene, and ethylene), and high-pressure gas membrane rupture. These disadvantages include: 1. The materials used in TNT detonation and pure oxygen deflagration are hazardous, and if pyrotechnics are involved, their production, transportation, and management are risky and costly; 2. High-pressure gas membrane rupture, however, results in high testing costs due to the high cost of the membrane. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide an explosion load simulation test device, system and method. By adopting a methane-air mixture as the explosion source, the safety, reliability and repeatability of the test are improved while reducing the test cost.

[0004] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0005] In a first aspect, the present invention provides an explosion load simulation test device, comprising a driving section and a driven section;

[0006] The driving section includes a test pipe with two through ends, which is used to guide and contain the methane-air mixture and the deflagration products. The test pipe is provided with a plurality of through holes that can be sealed with bolts, which are used to install a gas supply device, an ignition device or a data acquisition device. The test pipe is provided with an obstacle baffle and a polyethylene film. The obstacle baffle is used to change the flow state of the methane-air mixture and promote the deflagration of the methane-air mixture. The polyethylene film is used to form an inflation section.

[0007] The driven section includes an expansion section, a straight section and a structural section connected in sequence. The first end of the expansion section is connected to the test pipe for diffusing the shock wave generated by the deflagration. The two ends of the straight section are respectively connected to the second end of the expansion section and the structural section for completing the shaping of the explosion load and measuring the explosion load. The structural section is used to withstand the explosion load driven by the deflagration of the methane-air mixture gas.

[0008] In combination with the first aspect, optionally, the test pipeline includes a basic pipeline and an explosion-relief pipeline, and the explosion-relief pipeline is provided with an explosion-relief port for providing an outlet for internal high-temperature and high-pressure explosion products to avoid the reciprocating transmission of pressure waves in the basic pipeline; the basic pipeline, the explosion-relief pipeline and / or the obstacle partition are connected in any combination and sequence, and are all connected to other adjacent components through flanges.

[0009] In combination with the first aspect, optionally, the test pipe is further provided with a bolt hole, wherein the bolt hole that can be sealed with a bolt is used for installing an air supply device, an ignition device or a data acquisition device.

[0010] In combination with the first aspect, optionally, the test pipe is a steel pipe with a rectangular cross-section;

[0011] The obstacle partition is a steel plate component, and the cross-sectional width is consistent with the test pipe, and different opening ratios can be set by changing the cross-sectional height;

[0012] The expanded section is a prism structure, the first end is a small-diameter end connected to the test pipe, and the cross-sectional size is consistent with the test pipe, and the second end is a large-diameter end connected to the straight section, and the cross-sectional size is consistent with the straight section.

[0013] In combination with the first aspect, optionally, the test pipe has a cross-sectional size of 800×800 mm, a wall thickness of 30 mm, and a length of 30,000 mm;

[0014] When the opening rate of the barrier partition is 25%, the cross-sectional dimensions are 800×200 mm; when the opening rate is 50%, the cross-sectional dimensions are 800×400 mm;

[0015] The cross-sectional dimensions of the enlarged section at the first end are 800×800 mm, the cross-sectional dimensions at the second end are 2000×2000 mm, the wall thickness is 30 mm, and the length is 3000 mm;

[0016] The straight section has a cross-sectional dimension of 2000×2000 mm, a wall thickness of 30 mm, and a length of 2000 mm.

[0017] In combination with the first aspect, optionally, the structural segment is a steel plate or a concrete plate.

[0018] In a second aspect, the present invention further provides an explosion load simulation test system, comprising an air supply device, an ignition device, a data acquisition device, and the explosion load simulation test device according to any one of the first aspects;

[0019] The gas supply device includes a gas cylinder group, which is connected to the through hole corresponding to the gas filling section in the test pipeline through a pressure reducing valve and an air inlet valve in sequence;

[0020] The ignition device includes an initiator and an ignition head, wherein the initiator is connected to the ignition head via an initiator cable, and the ignition head is connected to a through hole on an end cover plate provided at the end of the test pipe;

[0021] The data acquisition device includes a data acquisition instrument, an infrared gas analyzer, a pressure sensor, a temperature sensor and / or a high-speed camera. The infrared gas analyzer, the pressure sensor, the temperature sensor and the high-speed camera are all installed in the through holes on the test pipe and connected to the data acquisition instrument via cables, and are used to collect and record data in real time during the methane-air mixture gas explosion driving process.

[0022] In combination with the second aspect, optionally, the infrared gas analyzer is used to measure the gas concentration in the test pipeline; the pressure sensor is used to measure the pressure during the methane-air mixture gas explosion driving process; the temperature sensor is used to measure the temperature during the methane-air mixture gas explosion driving process; the high-speed camera is used to record visual data during the methane-air mixture gas explosion driving process.

[0023] In a third aspect, the present invention further provides an explosion load simulation test method, comprising the following steps:

[0024] Mixing methane and air in a certain proportion through the gas cylinder assembly and injecting the mixture into the inflation section in the test pipe;

[0025] When the gas concentration in the test pipe reaches a specified value as observed by the data acquisition instrument, the ignition head is detonated;

[0026] The pressure sensor, the temperature sensor and the high-speed camera collect and record the pressure, temperature and visual data of the methane-air mixture gas explosion driving process in real time.

[0027] In combination with the third aspect, optionally, before injecting the mixture of methane and air in a certain proportion into the inflation section in the test pipe through the gas cylinder assembly, the method further includes:

[0028] By changing the shape and position of the barrier baffle, the flow state and the deflagration state of the methane-air mixed gas are adjusted;

[0029] By changing the position of the polyethylene film, the length of the gas cloud in the inflation section is adjusted;

[0030] The expansion section satisfies the test structure size requirement and can diffuse the shock wave, reduce the pressure fluctuation in the straight section, and improve the stability of the test results.

[0031] The straight section is used to shape the blast load, thereby improving the uniformity of the blast load distribution on the structural section.

[0032] The explosion load driven by the deflagration of the methane-air mixture gas is borne by the structural segment.

[0033] Compared with the prior art, the present invention can at least achieve the following beneficial effects:

[0034] 1. The explosion load simulation test device provided by the present invention adopts a relatively safe and low-cost methane-air mixture as the explosion source, replacing the traditional explosion source in the existing technology that has safety risks and high economic costs, thereby improving the safety of the test and reducing the test cost;

[0035] 2. The explosion load simulation test method provided by the present invention achieves precise control of the load on the structural segment by changing driving conditions such as gas concentration, gas cloud length, and the shape and position of the obstacle partition. By simulating different forms of explosion loads, it effectively improves the safety, economy and accuracy of the explosion test. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 This is a structural diagram of an explosion load simulation test device provided by an embodiment of the present invention;

[0038] Figure 2 This is a flange arrangement diagram of a test pipe connection provided by an embodiment of the present invention;

[0039] Figure 3 2 is a schematic structural diagram of an obstacle partition with an opening rate of 25% provided in an embodiment of the present invention;

[0040] Figure 4 Schematic diagram of the structure of an obstacle partition with an opening rate of 50% provided by an embodiment of the present invention;

[0041] Figure 5 This is a flange arrangement diagram of a straight section connection provided by an embodiment of the present invention;

[0042] Figure 6 This is a layout diagram of through holes on a basic pipeline provided by an embodiment of the present invention;

[0043] Figure 7This is a load-time curve diagram under different gas cloud lengths provided by an application example of the present invention;

[0044] Figure 8 This is a load and time curve diagram under a repetitive test provided by an application example of the present invention.

[0045] In the figure: 1-driving section; 11-basic pipe; 111-end cover plate; 112-bolt hole; 12-explosion relief pipe; 13-obstacle partition; 14-flange; 141-flange mounting plate; 142-flange mounting hole; 151-first through hole; 152-second through hole; 2-driven section; 21-expanded section; 22-straight section; 23-structural section. DETAILED DESCRIPTION

[0046] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0047] Example 1:

[0048] This embodiment provides an explosion load simulation test device, such as Figure 1 As shown, it includes a driving section 1 and a driven section 2. The driving section 1 is used to guide and contain the methane-air mixture and the explosion products, and mainly includes a test pipe with two through-holes. The test pipe includes a base pipe 11 and an explosion-venting pipe 12 with an explosion-venting vent on the outside of the top wall. The explosion-venting vent on the explosion-venting pipe 12 is used to provide an outlet for the internal high-temperature and high-pressure explosion products to prevent the explosion load from being transmitted back and forth in the base pipe 11. The explosion-venting pipe 12 can be transformed into the base pipe 11 by installing a completely enclosed explosion-venting plate, and the explosion-venting plate can be fixed to the top wall of the explosion-venting pipe 12 by bolts.

[0049] Furthermore, an obstacle baffle 13 is provided in the test pipeline for changing the flow state of the methane-air mixture and promoting the deflagration of the methane-air mixture. The basic pipeline 11, the explosion-proof pipeline 12 and / or the obstacle baffle 13 in the test pipeline can be connected in any combination and sequence, and are all connected to other adjacent components through flanges 14; for example, the basic pipelines 11 and the basic pipelines 11 can be fixed together by flanges 14, and the basic pipelines 11 and the explosion-proof pipeline 12 can be fixed together by flanges 14. The obstacle baffle 13 can be set between the basic pipelines 11 and the basic pipelines 11 and fixed together by flanges 14, or can be set between the basic pipelines 11 and the explosion-proof pipeline 12 and fixed together by flanges 14. It should be noted that, in combination with Figures 2 to 4The connections of the basic pipe 11, the explosion relief pipe 12 and the obstacle partition 13 are all provided with a flange mounting plate 141, and the flange mounting plate 141 is provided with a plurality of flange mounting holes 142. The flange 14 is installed in the flange mounting hole 142 to connect the various components.

[0050] Specifically, the test pipe is a steel pipe with a rectangular cross-section. For example, the cross-sectional dimensions may be 800×800 mm, the wall thickness may be 30 mm, and the length may be 30,000 mm. Assuming that the length of the basic pipe 11 or the explosion relief pipe 12 is 3,000 mm, the entire test pipe contains 10 basic pipes 11 or explosion relief pipes 12. In addition, the obstacle partition 13 is a steel plate component, and the cross-sectional width needs to be consistent with the test pipe. Different opening rates can be set by changing the cross-sectional height. Based on the above description, the number of obstacle partitions 13 that can be set is 1 to 9, and reference Figure 3 When the opening rate of the barrier partition 13 is 25%, the cross-sectional size is 800×200 mm. Figure 4 When the opening rate is 50%, the cross-sectional size is 800×400 mm.

[0051] It should be noted that in actual engineering applications, the cross-section of the test pipe is a specific matrix or circular shape. In addition, the cross-sectional dimensions, wall thickness, length of the test pipe, and the number, shape, position, and porosity of the barrier partitions 13 can all be set according to different working conditions, different load requirements, and actual test needs.

[0052] In some embodiments, the inner wall of the test pipe is further provided with polyethylene films fixed by magnetic strips, so that air-filled sections are formed between the polyethylene films.

[0053] In this embodiment, if Figure 1 As shown, the driven section 2 comprises an enlarged section 21, a straight section 22, and a structural section 23, which are connected in sequence. The enlarged section 21 is a prism-shaped structure that expands the explosive load surface to an appropriate size to meet the needs of prototype testing. It also serves to reduce vortex generation within the tail of the base pipe 11 and the enlarged section 21, optimizing its aerodynamic performance. It diffuses the shock wave generated by the deflagration, reduces local flow velocity, and minimizes pressure fluctuations within the straight section 22. It primarily comprises a first end (a smaller diameter end) and a second end (a larger diameter end). The first end connects to the test pipe via a flange 14, with the same cross-sectional dimensions as the test pipe. The second end connects to the straight section 22 via a flange 14, with the same cross-sectional dimensions as the straight section 22. Specifically, the cross-sectional dimensions of the first end of the enlarged section 21 can be 800 x 800 mm, and the cross-sectional dimensions of the second end can be 2000 x 2000 mm, with a wall thickness of 30 mm and a length of 3000 mm.

[0054] Furthermore, both ends of the straight section 22 are connected to the second end of the enlarged section 21 and the structural section 23 via flanges 14, specifically, as shown in FIG. Figure 5 As shown, the straight section 22 is provided with a flange mounting plate 141 at its connection to the second end of the expanded section 21 and at its connection to the structural section 23. The flange mounting plate 141 is provided with multiple flange mounting holes 142. The flange 14 is mounted in the flange mounting holes 142, thereby connecting the straight section 22 to the second end of the expanded section 21 and the structural section 23, respectively. The straight section 22 can adjust the distribution and arrival time of the explosive load to achieve a more uniform explosive load on the structural section 23, reduce turbulence and eddies within the structural section 23, improve the accuracy of test results, and measure the explosive load. Its cross-sectional dimensions can be 2000 x 2000 mm, with a wall thickness of 30 mm and a length of 2000 mm. Furthermore, the structural section 23 can be a steel plate or concrete slab to withstand the explosive load driven by the deflagration of a methane-air mixture. In this embodiment, the expanded section 21 and the straight section 22 generate a large and uniform explosive pressure load acting on the structural section 23 after the deflagration of the methane-air mixture.

[0055] As an embodiment, the test pipe is also provided with a plurality of through holes that can be sealed with bolts for installing a gas supply device, an ignition device, or a data acquisition device. In addition, one end of the non-connected expansion section 21 of the test pipe is also provided with an end cover plate 111, and the end cover plate 111 is provided with bolt holes 112 that can be sealed with bolts for installing a gas supply device, an ignition device, or a data acquisition device. Specifically, Figure 6 As shown, the basic pipe 11 is provided with two first through holes 151, which can be used to install a data acquisition device; it is also provided with two second through holes 152, which can be used to install an explosion-proof high-pressure blower in the gas supply device; on the left side of the basic pipe 11, the end cover plate 111 is connected to the flange mounting plate 141 through the flange 14, and the bolt hole 112 can be used to install a gas cylinder group or an ignition device in the gas supply device.

[0056] The explosion load simulation test device provided in this embodiment adopts a relatively safe and low-cost methane-air mixture gas as the explosion source, replacing the traditional explosion source in the existing technology that has safety risks and high economic costs, thereby improving the safety of the test and reducing the test cost.

[0057] As an optional embodiment, this embodiment designs optimized dimensions for the expanded section 21 and straight section 22: 3000 mm and 2000 mm, respectively. During the design process, a numerical model was first established. The accuracy and reliability of the numerical model were verified through mesh sensitivity analysis and comparison of simulation results at key locations with available experimental test data. Next, using the verified numerical model, a parametric study was conducted on the shape and length of the expanded section 21 and the length of the straight section 22. By analyzing their impact on the uniformity of the shock wave overpressure load distribution on the loading surface, the optimized dimensions of the expanded section 21 and straight section 22 were determined.

[0058] Specifically, regarding the shape of the expansion section 21, this embodiment designs three schemes based on engineering practice requirements, site conditions, and the purpose of optimizing the flow field distribution: Scheme 1 is a horizontal bottom arrangement; Scheme 2 is an inclined bottom with an asymmetrical arrangement; and Scheme 3 is an inclined bottom with a symmetrical arrangement. The planarity of the shock wave is quantitatively evaluated by comparing the two indicators of overpressure relative error and time absolute error. Among them, the overpressure relative error is used to measure the uniformity of the overpressure peak distribution, and its calculation formula is:

[0059] ,

[0060] Where, is the maximum pressure at the loading end; is the minimum pressure at the loading end;

[0061] The absolute time error is used to measure the synchronization of the shock wave front, and its calculation formula is:

[0062] ,

[0063] Where, is the slowest peak arrival time; is the fastest peak arrival time.

[0064] By comparison, although there are certain errors in Scheme 3, the relative error of overpressure and the absolute error of time both show relatively controllable performance. In addition, Scheme 3 can have a lower manufacturing cost and a more compact structure while ensuring uniform load on the loading surface. Therefore, the shape of the expansion section 21 is designed to be inclined at the bottom and symmetrically arranged up and down.

[0065] Furthermore, this embodiment continues to conduct parametric analysis on the lengths of the expanded section 21 and the straight section 22, still using the relative error of overpressure and the absolute error of time as key performance indicators. As shown in Table 1, some test data for different expanded section and straight section lengths are listed; the calculation formula for the overall error is:

[0066] ,

[0067] Where, is the overall error; is the relative error of overpressure; is the maximum relative error of overpressure; is the absolute time error; By comparing the experimental data, the optimized sizes of the expanded section 21 and the straight section 22 are set to 3 meters and 2 meters respectively.

[0068]

[0069] Table 1 Test data under different lengths of expansion section and straight section;

[0070] This embodiment designs optimized dimensions of the expanded section 21 and the straight section 22. The expanded section 21 meets the requirements of the test structure size, and at the same time can diffuse the shock wave, reduce the pressure fluctuation in the straight section 22, and improve the stability of the test results; the straight section 22 can make the explosion wave act more evenly on the structural section 23, and at the same time reduce the turbulence and eddy current in the straight section 22, thereby improving the accuracy of the test results.

[0071] Example 2:

[0072] This embodiment provides an explosion load simulation test system, comprising a gas supply device, an ignition device, a data acquisition device, and the explosion load simulation test device described in Example 1. Specifically, the gas supply device comprises a gas cylinder assembly and an explosion-proof high-pressure blower. The gas cylinder assembly can be connected to the through-hole corresponding to the inflatable section of the test pipe via a pressure reducing valve and an air inlet valve, respectively. The explosion-proof high-pressure blower can be connected to the second through-hole 152 of the test pipe via a blower duct. The ignition device comprises an initiator and an ignition head. The initiator is connected to the ignition head via an initiator cable, and the ignition head can be connected to the through-hole on the end cover plate at the end of the test pipe. The data acquisition device comprises a data acquisition instrument, an infrared gas analyzer, a pressure sensor, a temperature sensor, and / or a high-speed camera. The infrared gas analyzer, pressure sensor, temperature sensor, and high-speed camera are all installed in the through-hole on the test pipe and connected to the data acquisition instrument via a cable to collect and record data in real time during the deflagration-driven process of the methane-air mixture. Among them, the infrared gas analyzer is used to measure the gas concentration in the test pipeline; the pressure sensor is used to measure the pressure during the deflagration driving process of the methane-air mixture gas; the temperature sensor is used to measure the temperature during the deflagration driving process of the methane-air mixture gas; and the high-speed camera is used to record the visual data during the deflagration driving process of the methane-air mixture gas.

[0073] The blast load simulation test system provided in this embodiment, through its integrated data acquisition device, can collect and record real-time pressure, temperature, and visualization data during the explosion process. This data can be used to analyze and evaluate test results, further understanding the impact mechanism of blast loads, and providing a scientific basis and more comprehensive data support for structural design and safety assessment.

[0074] Example 3:

[0075] This embodiment provides a method for blast load simulation testing, which mainly includes the following steps:

[0076] Step S1: Mix methane and air in a certain proportion through a gas cylinder assembly and inject the mixture into the gas filling section of the test pipe;

[0077] Step S2: When the gas concentration in the test pipe reaches a specified value as observed by the data acquisition instrument, the ignition head is detonated;

[0078] Step S3: The pressure, temperature and visual data of the methane-air mixture gas explosion driving process are collected and recorded in real time by means of a pressure sensor, a temperature sensor and a high-speed camera.

[0079] Specifically, before executing step S1, the following steps are also included:

[0080] By changing the shape and position of the barrier baffle 13, the flow state and the deflagration state of the methane-air mixture gas are adjusted;

[0081] By changing the position of the polyethylene film, the length of the gas cloud in the inflation section can be adjusted;

[0082] The enlarged section 21 meets the test structure size requirement, while also being able to diffuse shock waves, reduce pressure fluctuations in the straight section 22, and improve the stability of the test results;

[0083] The straight section 22 is used to shape the blast load, thereby improving the uniformity of the blast load distribution on the structural section 23;

[0084] The explosion load driven by the deflagration of the methane-air mixture is absorbed by the structural section 23 .

[0085] In this embodiment, by changing different parameters in the driving section 1, such as: adjusting the length of the gas cloud by changing the position of the polyethylene film, changing the shape and position of the obstacle partition 13, and changing the position and number of the explosion vents by placing the explosion vent pipe 12, and then forming a large and uniform explosion pressure load on the structural section 23 through the expansion section 21 and the straight section 22, precise control of the load on the loading surface of the structural section 23 is achieved. By simulating explosion loads of different forms (different peak sizes and durations, etc.), the safety, economy and accuracy of the explosion test are effectively improved.

[0086] Furthermore, in step S1, methane and air can be mixed in a certain proportion to change the concentration of the gas injected into the aeration section of the test pipe. The gas concentration in the test pipe is measured using an infrared gas analyzer, and the explosion-proof high-pressure blower is simultaneously turned on to thoroughly mix the mixed gas in the pipe so that the concentration is uniform throughout the pipe. In step S2, when the gas concentration in the test pipe reaches a specified value (i.e., between 5% and 15%) as observed by the data acquisition instrument, the explosion-proof high-pressure blower can be turned off, and the ignition head can be detonated after the airflow stops and the test pipe is left to stand for 30 seconds.

[0087] The explosion load simulation test method provided in this embodiment needs to flexibly adjust parameters such as gas concentration, gas cloud length, shape and position of obstacle partitions, number and position of explosion vents according to actual working conditions to meet the load requirements of different tests. It can improve the test efficiency of disciplines such as explosion mechanics, engineering protection, safety science and engineering, etc.

[0088] In order to verify the explosion load simulation test method provided in this embodiment, this embodiment carried out loading experiments with different loads and loading experiments with repeated loads. Figure 7 As shown in the figure, the loading experiments with different loads used three gas cloud lengths of 2 meters, 3 meters, and 6 meters as control variables, resulting in explosion loads with peak overpressures of 70kPa, 158kPa, and 230kPa, respectively. The experimental results show that the explosion load simulation test device can effectively control the load of the explosion shock wave by changing the length of the precursor gas cloud, verifying the load control capability of the device. In addition, the device's gas concentration, the shape and position of the barrier baffle, the number and position of the explosion vents, and other parameters can all be adjusted. This multi-parameter adjustable experimental platform provides controllable experimental conditions for dynamic load simulation of engineering protective structures, verifying the device's engineering applicability and parameter controllability in explosion load simulation.

[0089] Further, such as Figure 8As shown, the repetitive load loading experiment employed two independent tests under identical initial conditions. The resulting explosion shock wave curves were highly consistent, with a relative deviation of less than 1% in peak overpressure. Furthermore, the time-domain waveforms exhibited significant statistical consistency (correlation coefficient R² ≥ 0.99) in parameters such as the rate of rise and the duration of the pressure plateau. These experimental results demonstrate that the stability of the device's load output can be verified through repetitive testing under the same operating conditions, facilitating the engineering requirements for reproducing explosion loads and providing a deterministic and repeatable experimental basis for quantitative research on explosive dynamic responses.

[0090] The embodiment of the present invention adopts a relatively safe methane-air mixture as the explosion source, replacing the highly dangerous, expensive and short-lasting explosion source; and then forms a large and uniform explosion pressure load acting on the structural section by setting a basic pipeline, an explosion relief pipeline, an obstacle baffle, an expansion section and a straight section. Among them, the test pipeline section including the basic pipeline and the explosion relief pipeline combines various parameter designs, which can simulate various complex gas dynamic conditions in the explosion environment, and provide more accurate test data for studying the impact of explosion loads on the structure. The obstacle baffle can change the gas dynamic state and regulate the deflagration effect. By changing the geometric parameters of the obstacle baffle, the gas dynamic flow field morphology and flow velocity field characteristics can be actively modulated, thereby significantly affecting the spatial distribution characteristics of the explosion shock wave load and its peak pressure parameters. The expansion angle of the expansion section is consistent with the tail expansion angle of the basic pipeline, which can optimize the aerodynamic performance. The straight section can make the explosion wave act more evenly on the structural section.

[0091] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0092] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0093] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An explosion load simulation test device, characterized in that: It includes a driving section and a driven section; The driving section includes a test pipe with two through-holes for guiding and containing a methane-air mixture and deflagration products. The test pipe is provided with a plurality of through-holes that can be sealed with bolts for installing a gas supply device, an ignition device, or a data acquisition device. An obstacle baffle and a polyethylene film are provided in the test pipe. The obstacle baffle is used to change the flow state of the methane-air mixture, regulate the deflagration of the methane-air mixture, and dissipate the propagation of pressure waves within the device. The polyethylene film is used to form an inflation section. The driven section includes an expansion section, a straight section and a structural section connected in sequence. The first end of the expansion section is connected to the test pipe for diffusing the shock wave generated by the deflagration. The two ends of the straight section are respectively connected to the second end of the expansion section and the structural section for completing the shaping of the explosion load and improving the uniformity of the explosion load distribution on the structural section. The structural section is used to withstand the explosion load driven by the deflagration of the methane-air mixture gas.

2. The explosion load simulation test device according to claim 1, characterized in that: The test pipeline includes a basic pipeline and an explosion-relief pipeline. The explosion-relief pipeline is provided with an explosion-relief port for providing an outlet for internal high-temperature and high-pressure explosion products to prevent pressure waves from being transmitted back and forth in the basic pipeline. The basic pipeline, the explosion-relief pipeline and / or the obstacle partition are connected in any combination and sequence, and are all connected to other adjacent components through flanges.

3. The explosion load simulation test device according to claim 1, characterized in that: The test pipe is further provided with a bolt hole, which is sealed with a bolt and is used for installing an air supply device, an ignition device or a data acquisition device.

4. The explosion load simulation test device according to claim 1, characterized in that: The test pipe is a steel pipe with a rectangular cross section; The obstacle partition is a steel plate component, and the cross-sectional width is consistent with the test pipe, and different opening ratios can be set by changing the cross-sectional height; The expanded section is a prism structure, the first end is a small-diameter end connected to the test pipe, and the cross-sectional size is consistent with the test pipe, and the second end is a large-diameter end connected to the straight section, and the cross-sectional size is consistent with the straight section.

5. The explosion load simulation test device according to claim 4, characterized in that: The test pipe has a cross-sectional dimension of 800 × 800 mm, a wall thickness of 30 mm, and a length of 30,000 mm; When the opening rate of the barrier partition is 25%, the cross-sectional dimensions are 800×200 mm; when the opening rate is 50%, the cross-sectional dimensions are 800×400 mm; The cross-sectional dimensions of the enlarged section at the first end are 800×800 mm, the cross-sectional dimensions at the second end are 2000×2000 mm, the wall thickness is 30 mm, and the length is 3000 mm; The straight section has a cross-sectional dimension of 2000×2000 mm, a wall thickness of 30 mm, and a length of 2000 mm.

6. The explosion load simulation test device according to claim 1, characterized in that: The structural segment may be a steel plate, a concrete plate or other test objects.

7. An explosion load simulation test system, characterized in that: It comprises an air supply device, an ignition device, a data acquisition device and an explosion load simulation test device according to any one of claims 1 to 6; The gas supply device includes a gas cylinder group, which is connected to the through hole corresponding to the gas filling section in the test pipeline through a pressure reducing valve and an air inlet valve in sequence; The ignition device includes an initiator and an ignition head, wherein the initiator is connected to the ignition head via an initiator cable, and the ignition head is connected to a through hole on an end cover plate provided at the end of the test pipe; The data acquisition device includes a data acquisition instrument, an infrared gas analyzer, a pressure sensor, a temperature sensor and / or a high-speed camera. The infrared gas analyzer, the pressure sensor, the temperature sensor and the high-speed camera are all installed in the through holes on the test pipe and connected to the data acquisition instrument via cables, and are used to collect and record data in real time during the methane-air mixture gas explosion driving process.

8. The explosion load simulation test system according to claim 7, characterized in that: The infrared gas analyzer is used to measure the gas concentration in the test pipeline; the pressure sensor is used to measure the pressure during the deflagration driving process of the methane-air mixture gas; the temperature sensor is used to measure the temperature during the deflagration driving process of the methane-air mixture gas; and the high-speed camera is used to record visual data during the deflagration driving process of the methane-air mixture gas.

9. A test method for an explosion load simulation test system according to claim 7 or 8, characterized in that: The steps include: Mixing methane and air in a certain proportion through the gas cylinder assembly and injecting the mixture into the inflation section in the test pipe; When the gas concentration in the test pipe reaches a specified value as observed by the data acquisition instrument, the ignition head is detonated; The pressure sensor, the temperature sensor and the high-speed camera collect and record the pressure, temperature and visual data of the methane-air mixture gas explosion driving process in real time.

10. The explosion load simulation test method according to claim 9, characterized in that: Before injecting the mixture of methane and air in a certain proportion into the inflation section in the test pipe through the gas cylinder assembly, the method further includes: By changing the shape and position of the barrier baffle, the flow state and the deflagration state of the methane-air mixed gas are adjusted; By changing the position of the polyethylene film, the length of the gas cloud in the inflation section is adjusted; The expansion section satisfies the test structure size requirement and can diffuse the shock wave, reduce the pressure fluctuation in the straight section, and improve the stability of the test results. The straight section is used to shape the blast load, thereby improving the uniformity of the blast load distribution on the structural section. The explosion load driven by the deflagration of the methane-air mixture gas is borne by the structural segment.

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