A combined sparse wave absorbing device

Abstract

The present invention relates to a combined rarefaction wave absorbing device, comprising an isolation pipe (1), a wave absorbing pipe (2) and a wave absorbing door (3), wherein the wave absorbing pipe (2) is a straight tube structure with openings at both ends, and the openings at both ends are respectively provided with wave absorbing doors (3), the middle part of the wave absorbing pipe (2) is connected with one end of the straight tube-shaped isolation pipe (1), the other end of the isolation pipe (1) is coaxial with a test chamber (4) of a blast wave simulation system and is connected with a test section of the test chamber (4), the axis of the wave absorbing pipe (2) and the axis of the isolation pipe (1) are located in the same horizontal plane, and the angle between the axis of the wave absorbing pipe (2) and the axis of the isolation pipe (1) is 30 to 60 degrees. The present invention adopts a "y"-shaped three-way structure pipeline in the isolation section of the blast wave simulation system, and cooperates with a loose-leaf wave absorbing door to effectively reduce the influence of rarefaction waves on shock waves in the test section, and the present invention occupies a small area, is easy to assemble, and is safer and more efficient.

Description

Technical Field

[0001] The invention relates to a technology for simulating explosion shock wave effects, in particular to a combined rarefaction wave absorbing device. Background Art

[0002] Whether it is the explosion of weapons under battlefield conditions or the explosion of various explosive devices such as car bombs in terrorist attacks, they will produce highly destructive explosion shock waves. The study of the effect of air shock waves has always been one of the key contents of the study of explosion damage effects. The explosion wave simulation system is an effective test device for simulating the explosion shock wave effect. Various explosion wave simulation systems usually use the explosion of explosives to generate shock waves. For example, in the explosion wave simulation system designed by our department (CN201920777929.3, an explosion shock wave damage test system), the explosion of TNT charges is used in the explosion chamber to generate shock waves. By adjusting the charge amount and layout of the explosives, waveforms similar to various explosions can be generated in the test chamber.

[0003] At present, in the operation of the explosion wave simulation system, in order to weaken the influence of the rarefaction wave, the test chamber is actually divided into two sections, the front section is close to the explosion chamber, which is the test section, and the test model is placed in this section; after the test section is the isolation section, a plurality of loose-leaf wave-breaking holes are set on the end wall of the isolation section to eliminate the influence of the rarefaction wave on the test results. However, with such a structural design, when the shock wave passes through the test section and reaches the isolation section, a rarefaction wave of a certain intensity will still be generated to propagate to the test section. After reaching the test section, this rarefaction wave will affect the overpressure waveform of the test section, not only causing the experimental waveform to be disordered, but also causing the overpressure action time of the shock wave in the test section to be shortened, and the ideal simulation effect cannot be achieved. In order to minimize the influence of the rarefaction wave, the existing conventional method at home and abroad is to continuously lengthen the length of the isolation section, but this will not only increase the floor space due to the increase in the length of the equipment, but also cause a large increase in the construction cost. Therefore, how to design a suitable rarefaction wave absorbing device has become an important issue in the construction of the explosion wave simulation system. Summary of the invention

[0004] In view of the problems in the background technology, the purpose of the present invention is to propose a combined sparse wave wave-breaking device, which, when used in a test chamber of a blast wave simulation system, has the characteristics of small footprint and good wave-breaking effect, can greatly improve the isolation effect of sparse waves and ensure the validity of the test results.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a combined sparse wave wave-breaking device, comprising an isolation tube, a wave-breaking tube and a wave-breaking door, wherein the wave-breaking tube is a straight tube structure with openings at both ends, and the openings at both ends are respectively provided with wave-breaking doors, the middle part of the wave-breaking tube is connected with one end of the straight tube-shaped isolation tube, and the other end of the isolation tube is coaxial with the test chamber and connected with the test section of the test chamber, the axis of the wave-breaking tube and the axis of the isolation tube are located in the same horizontal plane, and the angle between the axis of the wave-breaking tube and the axis of the isolation tube is 30 to 60°.

[0006] The wave-breaking door is composed of a frame, a movable baffle and a rotating shaft. The frame is fixedly connected to the pipe opening of the wave-breaking pipe. Horizontal rotating shafts are equally divided on the frame, and each rotating shaft is hinged with a movable baffle.

[0007] The angle between the axis of the wave-breaking pipe and the axis of the isolation pipe is 45°.

[0008] The isolation pipe has a rectangular or circular cross section, and the cross section of the wave-breaking pipe has the same external dimensions as the cross section of the isolation pipe.

[0009] The isolation pipe is fixedly connected to the test section of the test chamber through a connecting flange.

[0010] Principle of the present invention:

[0011] The present invention adopts a "y"-shaped three-way pipe structure. When the shock wave is transmitted to the end of the isolation tube, due to the inclined arrangement between the wave-breaking tube and the isolation tube, the shock wave is reflected by the wall and then transmitted from the pipe opening on one side of the wave-breaking tube. At this time, under the action of the movable leaf wave-breaking door, most of the shock wave is transmitted to the external atmosphere, and a small amount of sparse waves generated return to the wave-breaking tube. Since the wave-breaking tube is a straight tube with openings at both ends, most of the sparse waves are quickly discharged from the opening on the other side, thereby minimizing the influence of the sparse waves on the test section.

[0012] The beneficial effects of the present invention are as follows: the present invention adopts a "y"-shaped three-way structure pipeline in the isolation section of the explosion wave simulation system, and cooperates with a loose-leaf wave-absorbing door to effectively reduce the influence of sparse waves on the shock wave of the test section. The present invention occupies a small area, is easy to assemble, and is safer and more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0014] Figure 2 A top view of the connection between the present invention and the test system

[0015] Figure 3 for Figure 1 D_D section view.

[0016] Figure 4 for Figure 3 A-direction view.

[0017] In the figure, 1, isolation tube, 2, wave-breaking tube, 3, wave-breaking door, 301, frame, 302, movable baffle, 303, rotating shaft, 4, test chamber, 5, connecting flange, 6, explosion chamber. DETAILED DESCRIPTION

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0019] like Figure 2 As shown, the explosion wave simulation system includes an explosion chamber 6 and a test chamber 4, wherein one end of the test chamber 4 close to the explosion chamber 6 is a test section. Now, the device provided by the present invention is used to improve the second half of the test chamber to obtain the best sparse wave reduction effect with a smaller spatial structure.

[0020] like Figure 1 , Figure 2 As shown, a combined rarefaction wave absorbing device includes an isolation tube 1, a wave absorbing tube 2 and a wave absorbing door 3. The wave absorbing tube 2 is a straight tube structure with openings at both ends, and the openings at both ends are respectively provided with wave absorbing doors 3. The middle part of the wave absorbing tube is connected with one end of the straight tube-shaped isolation tube 1, and the other end of the isolation tube 1 is coaxial with the test chamber 4 and connected with the test section of the test chamber 4. The axis of the wave absorbing tube 2 and the axis of the isolation tube 1 are located in the same horizontal plane, and the angle between the axis of the wave absorbing tube 2 and the axis of the isolation tube 1 is 30 to 60 degrees. With such a structure, when the shock wave enters the wave absorbing tube from the isolation tube 1, it is reflected by the wall and transmitted from the wave absorbing door 3 at the pipe opening on one side of the wave absorbing tube 2. However, any wave absorbing door cannot eliminate the rarefaction wave 100%, and a small amount of rarefaction wave will still enter the wave absorbing tube 2, and most of the rarefaction wave will be transmitted from the pipe opening on the other side, further reducing the rarefaction wave entering the test chamber.

[0021] like Figure 3 , Figure 4 As shown, the wave-breaking door 3 is composed of a frame 301, a movable baffle 302 and a rotating shaft 303. The frame 301 is fixedly connected to the pipe mouth of the wave-breaking tube 2. The frame 301 is evenly provided with horizontal rotating shafts 303, and each rotating shaft 303 is hinged with a movable baffle 302. This one-way open hinge structure, after the shock wave in the wave-breaking tube passes, the movable baffle 302 is quickly closed under the action of its own gravity and negative pressure, preventing the external sparse wave from propagating to the test section through the wave-breaking tube, thereby reducing the influence of the sparse wave.

[0022] The angle between the axis of the wave-breaking pipe 2 and the axis of the isolation pipe 1 is 45°.

[0023] The isolation pipe 1 has a rectangular or circular cross section, and the cross section of the wave-breaking pipe 2 has the same external dimensions as the cross section of the isolation pipe 1 .

[0024] The isolation pipe 1 is fixedly connected to the test section of the test chamber 4 via a connecting flange 5 .

[0025] The parts not described in detail in this invention are prior art.

Claims

1. A combined rarefaction wave absorbing device, comprising an isolation tube (1), a wave absorbing tube (2) and a wave absorbing door (3), characterized in that: The wave-breaking pipe (2) is a straight tube structure with openings at both ends, and wave-breaking doors (3) are respectively provided at the openings at both ends. The middle part of the wave-breaking pipe (2) is connected to one end of the straight tube-shaped isolation pipe (1), and the other end of the isolation pipe (1) is coaxial with the test chamber (4) of the explosion wave simulation system and is connected to the test section of the test chamber (4). The axis of the wave-breaking pipe (2) and the axis of the isolation pipe (1) are located in the same horizontal plane, and the angle between the axis of the wave-breaking pipe (2) and the axis of the isolation pipe (1) is 30 to 60 degrees. The wave-breaking door (3) is composed of a frame (301), a movable baffle (302) and a rotating shaft (303); the frame (301) is fixedly connected to the pipe opening of the wave-breaking pipe (2); the frame (301) is provided with horizontal rotating shafts (303) in equal parts, and each rotating shaft (303) is hingedly connected with a movable baffle (302); The isolation pipe (1) has a rectangular or circular cross-section, and the cross-section of the wave-absorbing pipe (2) has the same external dimensions as the cross-section of the isolation pipe (1).

2. A combined rarefaction wave absorbing device according to claim 1, characterized in that: The angle between the axis of the wave-breaking pipe (2) and the axis of the isolation pipe (1) is 45°.

3. A combined rarefaction wave absorbing device according to claim 1, characterized in that: The isolation pipe (1) is fixedly connected to the test section of the test chamber (4) via a connecting flange (5).

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