Shock-wave attenuation device for single-pulse shock tube and single-pulse shock system
By designing a segmented attenuation container and a gap sealing structure in a single-pulse shock tube, the problem that the unloading tank cannot effectively absorb reflected shock waves was solved, and multiple attenuations of reflected shock waves were achieved, thus improving the accuracy of the experiment.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- TIANJIN UNIV
- Filing Date
- 2024-12-23
- Publication Date
- 2026-07-02
AI Technical Summary
The unloading tank of the existing single-pulse shock tube cannot effectively absorb or control the reflected shock wave, which affects the accuracy of the experiment.
Design a segmented shock vessel, comprising a gas chamber pipe and multiple shock gaps, and control the reflected shock wave to enter the containment cavity for multiple reflections and reductions through a detachable gap sealing structure.
This improves the accuracy of the experiment by reducing the reflected shock wave through multiple reflections, thus minimizing its impact on the subsequent reaction mixture.
Smart Images
Figure CN2024141482_02072026_PF_FP_ABST
Abstract
Description
Shock cancellation device and single-pulse shock system for single-pulse shock tubes Technical Field
[0001] This disclosure relates to the field of basic reactor technology, and more specifically, to a shock wave attenuation device and a single-pulse shock wave system for a single-pulse shock tube. Background Technology
[0002] Single-pulse shock tubes can provide high-temperature, high-pressure data for constructing, constraining, and validating combustion reaction kinetic models. The single-pulse shock tube quenches the reaction mixture and puts it in a "frozen" state by reflecting rarefaction waves, a state collected by a sampling system. A single-pulse shock tube typically requires an unloading tank to absorb the reflected shock wave and receive the high-temperature, high-pressure carrier gas to minimize its impact on subsequent reaction mixtures.
[0003] In related technologies, the unloading tank is usually located near the diaphragm of the shock tube and is connected to the main pipeline at a 45-degree or 90-degree angle. Its absorption effect on the reflected shock wave is not obvious, and it is impossible to control the degree of absorption or suppression of the reflected shock wave, thus affecting the accuracy of the experiment. Summary of the Invention
[0004] In view of this, the present disclosure provides a shock wave reduction device and a single-pulse shock wave system for a single-pulse shock tube.
[0005] One aspect of this disclosure provides a shock cancellation device for a single-pulse shock tube, comprising:
[0006] A segmented reduction container, wherein the segmented reduction container has a receiving cavity;
[0007] A gas chamber pipe runs through the segmented reduction container. The first end of the gas chamber pipe is connected to the diaphragm end of the single-pulse shock tube, and the second end of the gas chamber pipe is connected to the driven end of the single-pulse shock tube. Multiple reduction gaps are provided on the gas chamber pipe located in the accommodating cavity.
[0008] Multiple gap-sealing structures are detachably installed on multiple of the aforementioned gap-reducing structures;
[0009] In the case where gas is injected into the single-pulse shock tube and the diaphragm end ruptures, the gas moves from the first end to the second end under the action of pressure difference. During the process of the gas moving between the attenuation gap and the second end, a reflected shock wave is formed that moves toward the first end. By setting the gap sealing structure to block the number and position of the attenuation gaps, the reflected shock wave that enters the receiving cavity through the unsealed attenuation gap is subjected to multiple reflections and attenuation.
[0010] According to embodiments of this disclosure, the shock wave attenuation device further includes:
[0011] A first mounting flange is installed at the first end of the aforementioned air chamber pipe, and the aforementioned air chamber pipe is sealed to the aforementioned diaphragm end through the first mounting flange; and / or
[0012] The second mounting flange is installed at the second end of the aforementioned air chamber pipe, and the aforementioned air chamber pipe is sealed to the aforementioned driven end through the aforementioned second mounting flange.
[0013] According to embodiments of this disclosure, the segmented reduction container includes:
[0014] A receiving cylinder, wherein the receiving cavity is formed on one side of the receiving cylinder;
[0015] The receiving cover is sealed to the aforementioned receiving cylinder.
[0016] According to an embodiment of this disclosure, the aforementioned receiving cover is sealed to the aforementioned receiving cylinder by a first screw.
[0017] According to embodiments of this disclosure, the segmented reduction container further includes:
[0018] A sealing ring is used to seal the cover plate to the container body.
[0019] According to an embodiment of this disclosure, the straight line containing the gap reduction is at a predetermined angle to the central axis of the air chamber pipe.
[0020] Preferably, the preset angle is 0°.
[0021] According to embodiments of this disclosure, the above-mentioned gap sealing structure includes:
[0022] The first sealing assembly and the second sealing assembly are installed in contact with the outer wall of the gas chamber pipe when the gap is reduced, wherein the length of the first sealing assembly is greater than the length of the second sealing assembly.
[0023] The aforementioned gap reduction can be completely sealed by the first sealing component and the second sealing component, or the aforementioned gap reduction can be partially sealed by the first sealing component or the second sealing component.
[0024] According to embodiments of this disclosure, each of the first and second sealing components includes:
[0025] The sealing plate is configured to be inserted into the aforementioned reduction gap;
[0026] The mounting part is connected to the aforementioned sealing piece, and the mounting part is configured to fit against the outer wall of the aforementioned air chamber pipe.
[0027] Preferably, the mounting part is detachably connected to the air chamber pipe by a second screw.
[0028] Another aspect of this disclosure provides a single-pulse shock system, comprising:
[0029] Single-pulse shock tube;
[0030] A shock wave reduction device, wherein the first end of the air chamber pipe in the shock wave reduction device is connected to the diaphragm end of the single-pulse shock tube, and the second end of the air chamber pipe is connected to the driven end of the single-pulse shock tube.
[0031] In the case where gas is injected into the single-pulse shock tube and the diaphragm end ruptures, the gas moves from the first end to the second end under the action of pressure difference. During the movement of the gas through the reduction gap in the gas chamber pipe and the second end, a reflected shock wave is formed. When the reflected shock wave moves towards the first end under the action of reflection, it enters the receiving cavity in the shock wave reduction device through the reduction gap in the gas chamber pipe to perform multiple reflections and reductions on the reflected shock wave.
[0032] According to embodiments of this disclosure, the single-pulse shock system further includes:
[0033] A gas supply device is configured to supply the aforementioned gas; and / or
[0034] The gas processing device is configured to create a pressure difference so that the gas moves from the first end to the second end under the action of the pressure difference.
[0035] According to embodiments of this disclosure, by setting multiple reduction gaps on the gas chamber pipe within the segmented reduction container, and simultaneously setting detachable gap sealing structures on some of the reduction gaps, it is convenient that when conducting experiments using a single-pulse shock tube, the gas moves from the first end to the second end under the action of pressure difference to form a reflected shock wave. At this time, under the action of reflection, the reflected shock wave moves towards the first end and enters the containment cavity through the reduction gaps to perform multiple reflections and reductions on the reflected shock wave, thereby achieving absorption and control of the reflected shock wave and improving experimental accuracy. Attached Figure Description
[0036] The above and other objects, features and advantages of this disclosure will become clearer from the following description of embodiments with reference to the accompanying drawings, in which:
[0037] Figure 1 shows a perspective view of a shock wave reduction device according to an embodiment of the present disclosure;
[0038] Figure 2 shows a partial exploded view of a shock wave mitigation device according to an embodiment of the present disclosure;
[0039] Figure 3 shows a cross-sectional schematic diagram of a shock wave reduction device according to an embodiment of the present disclosure;
[0040] Figure 4 shows a schematic diagram of the connection between the gap sealing structure and the air chamber pipeline according to an embodiment of the present disclosure;
[0041] Figure 5 shows cross-sectional views of the plugging assembly according to an embodiment of the present disclosure from different angles;
[0042] Figure 6 shows a physical illustration of a shock wave reduction device according to an embodiment of the present disclosure;
[0043] Figure 7 shows a comparison of the secondary pressure curves of the empty and full air rings and the conventional unloading section according to an embodiment of the present disclosure.
[0044] In the above figures, the meanings of the reference numerals are as follows: 100-Segmented reduction container; 101-Receiving cavity; 110-Receiving cylinder; 120-Receiving cover plate; 130-First screw; 140-Sealing ring; 200-Gas chamber pipe; 210-Reduction gap; 300-Gap sealing structure; 310-First sealing assembly; 320-Second sealing assembly; 321-Sealing plate; 322-Mounting part; 400-First mounting flange; 500-Second mounting flange. Detailed Implementation
[0045] To make the objectives, technical solutions, and advantages of this disclosure clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.
[0046] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.
[0047] All terms used herein, including technical and scientific terms, have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.
[0048] When using expressions such as "at least one of A, B, and C," the expression should generally be interpreted in accordance with the meaning commonly understood by those skilled in the art. For example, "a system having at least one of A, B, and C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or systems having A, B, and C. Similarly, when using expressions such as "at least one of A, B, or C," the expression should generally be interpreted in accordance with the meaning commonly understood by those skilled in the art. For example, "a system having at least one of A, B, or C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or systems having A, B, and C.
[0049] It should also be noted that the directional terms mentioned in the embodiments, such as "up," "down," "front," "back," "left," and "right," are only for reference to the directions in the accompanying drawings and are not intended to limit the scope of protection of this disclosure. Throughout the drawings, the same elements are represented by the same or similar reference numerals. Conventional structures or constructions will be omitted where they may cause confusion in understanding this disclosure.
[0050] Figure 1 shows a perspective view of a shock wave mitigation device according to an embodiment of the present disclosure. Figure 2 shows a partial exploded view of a shock wave mitigation device according to an embodiment of the present disclosure.
[0051] As shown in Figures 1 and 2, the shock wave reduction device for a single-pulse shock tube includes:
[0052] The segmented reduction container 100 has a receiving cavity 101.
[0053] The air chamber pipe 200 penetrates the segmented reduction container 100. The first end of the air chamber pipe 200 is connected to the diaphragm end of the single-pulse shock tube, and the second end of the air chamber pipe 200 is connected to the driven end of the single-pulse shock tube. Multiple reduction gaps 210 are provided on the air chamber pipe 200 located in the receiving cavity 101.
[0054] Multiple gap sealing structures 300 are detachably installed on multiple reduction gaps 210, wherein the number of gap sealing structures 300 installed on reduction gaps 210 is related to the number of reflected shock waves entering the receiving cavity 101;
[0055] In the case where the single-pulse shock tube is injected with gas and the diaphragm end is ruptured, the gas moves from the first end to the second end under the action of pressure difference. During the process of the gas moving between the attenuation gap 210 and the second end, a reflected shock wave is formed that moves toward the first end. By setting the gap sealing structure 300 to block the number and position of the attenuation gaps 210, the reflected shock wave that enters the receiving cavity 101 through the unsealed attenuation gaps 210 is reflected and attenuated multiple times.
[0056] According to embodiments of this disclosure, the shape of the gas chamber pipe 200 can be specifically set according to experimental requirements. The gas chamber pipe 200 and the segmented reduction container 100 are connected by welding to ensure good airtightness.
[0057] According to an embodiment of this disclosure, after connecting the shock wave reduction device to the single-pulse shock tube, gas is injected into the single-pulse shock tube. At this time, the pressure at the first end of the gas chamber pipe 200 is greater than the pressure at the second end. Under the action of this pressure difference, the injected gas flows towards the second end in the gas chamber pipe 200. During the flow, the gas forms a compression wave, which represents the flow pattern of the gas. After flowing a certain distance, a shock wave is formed between the reduction gap 210 and the second end. The shock wave forms a reflected shock wave under the action of reflection and moves towards the first end in the gas chamber pipe 200. At this time, the reflected shock wave enters the receiving cavity 101 through the unsealed reduction gap 210. The reflected shock wave gradually attenuates in the receiving cavity 101 through multiple reflections.
[0058] It should be noted that the number of gap reduction structures 210 can be set according to actual needs, for example, it can be 16. At the same time, not all gap reduction structures 210 need to be installed with gap sealing structures 300. The corresponding number of gap sealing structures 300 can be installed according to experimental needs, and the installation position can also be set according to experimental needs.
[0059] According to the embodiments of this disclosure, by setting multiple reduction gaps 210 on the gas chamber pipe 200 in the segmented reduction container 100, and setting a detachable gap sealing structure 300 on some of the reduction gaps 210, it is convenient that when using a single-pulse shock tube for experiments, the gas moves from the first end to the second end under the action of pressure difference to form a reflected shock wave. At this time, under the action of reflection, the reflected shock wave moves towards the first end and enters the receiving cavity 101 through the reduction gaps 210 to perform multiple reflections and reductions on the reflected shock wave, thereby realizing the absorption and control of the reflected shock wave and improving the accuracy of the experiment.
[0060] Figure 3 shows a cross-sectional schematic diagram of a shock wave mitigation device according to an embodiment of the present disclosure. Figures 3(a) and 3(b) are cross-sectional views of the shock wave mitigation device from different angles.
[0061] As shown in Figures 1, 2, and 3, the shock wave reduction device also includes:
[0062] A first mounting flange 400 is installed at the first end of the gas chamber pipe 200, and the gas chamber pipe 200 is sealed to the diaphragm end through the first mounting flange 400; and / or
[0063] The second mounting flange 500 is installed at the second end of the air chamber pipe 200, and the air chamber pipe 200 is sealed to the driven end through the second mounting flange 500.
[0064] According to embodiments of this disclosure, the first mounting flange 400 and the second mounting flange 500 both serve to connect with other components to ensure good airtightness.
[0065] According to embodiments of this disclosure, in order to further improve airtightness, sealing rings can also be installed on the first mounting flange 400 and the second mounting flange 500. The sealing rings can be made of rubber, or other materials with the same sealing function.
[0066] According to an embodiment of this disclosure, referring to FIG3, the segmented reduction container 100 includes:
[0067] The receiving cylinder 110 has a receiving cavity 101 formed on one side;
[0068] The cover plate 120 is sealed to the housing cylinder 110.
[0069] According to the embodiments of this disclosure, the segmented shock wave reduction container 100 is designed as a detachable housing cylinder 110 and housing cover 120, which facilitates the installation or removal of the gap sealing structure 300 on the shock wave reduction gap 210 by the experimenter according to the experimental requirements, thereby improving the reusability of the shock wave reduction device.
[0070] According to an embodiment of this disclosure, the receiving cover 120 is sealed to the receiving cylinder 110 by a first screw 130.
[0071] According to an embodiment of this disclosure, a connecting ring is provided on one side of the opening of the receiving cylinder 110, and the size of the receiving cover plate 120 is larger than the size of the receiving cylinder 110. At this time, the receiving cover plate 120 can be connected to the receiving cylinder 110 or the connecting ring by the first screw 130.
[0072] It should be noted that using the first screw 130 for sealing connection is only one connection method; snap-fit connections can also be used.
[0073] According to an embodiment of this disclosure, referring to FIG3, the segmented reduction container 100 further includes:
[0074] The sealing ring 140 and the receiving cover plate 120 are sealed to the receiving cylinder 110 through the sealing ring 140.
[0075] According to the embodiments of this disclosure, the sealing ring 140 is used to improve the airtightness of the shock wave reduction device to prevent gas from escaping from the gap between the receiving cylinder 110 and the receiving cover plate 120, thereby further improving the accuracy of the experiment.
[0076] According to an embodiment of this disclosure, the straight line containing the gap reduction 210 forms a preset angle with the central axis of the air chamber pipe 200.
[0077] According to the embodiments of this disclosure, the preset angle can be set according to the actual situation, and can be any angle from 0 to 90°. It is only necessary to ensure that the gap sealing structure 300 is installed after the gap reduction 210 is installed and the gap sealing structure 300 is in contact with the outer wall of the gas chamber pipe 200, so as to prevent gas or reflected shock waves from escaping from the gap between the gap sealing structure 300 and the gap reduction 210.
[0078] It should be noted that when the preset angle is 90°, the reduction gap 210 can be a non-circular arc shape to avoid dividing the air chamber pipe 200 into two sections. When the preset angle is 0°, the reduction gap 210 is parallel to the air chamber pipe 200. At this time, multiple reduction gaps 210 can be evenly opened around the circumference of the air chamber pipe 200. Of course, non-uniform deployment can also achieve the reduction of reflected shock waves.
[0079] Figure 4 shows a schematic diagram of the connection between the gap sealing structure 300 and the air chamber pipe 200 according to an embodiment of the present disclosure. In particular, Figure 4(a) is a schematic diagram without the gap sealing structure 300 installed, and Figure 4(b) is a schematic diagram after the gap sealing structure 300 is installed.
[0080] According to an embodiment of this disclosure, as shown in FIG4, the gap sealing structure 300 includes:
[0081] The first sealing component 310 and the second sealing component 320 are installed in contact with the outer wall of the gas chamber pipe 200 when the gap 210 is reduced. The length of the first sealing component 310 is greater than the length of the second sealing component 320.
[0082] The gap 210 is completely sealed by the first sealing component 310 and the second sealing component 320, or the gap 210 is partially sealed by the first sealing component 310 or the second sealing component 320.
[0083] According to the embodiments of this disclosure, different experiments have different requirements. In this case, on the one hand, a gap sealing structure 300 can be installed on the partially reduced gap 210, and on the other hand, only the first sealing component 310 or the second sealing component 320 can be installed on the partially reduced gap 210, so as to suit different experimental requirements.
[0084] According to another embodiment of this disclosure, the gap sealing structure 300 includes a third sealing component, the length of which is equal to the length of the reduced gap 210.
[0085] It should be noted that, in order to further improve the accuracy of the experiment, the gap sealing structure 300 can be designed as an n-segment sealing assembly, with different numbers of sealing assemblies installed on each reduction gap 210, thereby more accurately controlling the number of reflected shock waves entering the containment cavity 101.
[0086] Figure 5 shows cross-sectional views of the plugging assembly according to embodiments of the present disclosure at different angles.
[0087] According to embodiments of this disclosure, each of the first blocking assembly 310 and the second blocking assembly 320 includes:
[0088] The sealing piece 321 is configured to be inserted into the reduction gap 210;
[0089] The mounting part 322 is connected to the sealing piece 321, and the mounting part 322 is configured to fit against the outer wall of the air chamber pipe 200.
[0090] Preferably, the mounting part 322 is detachably connected to the air chamber pipe 200 by a second screw.
[0091] According to an embodiment of this disclosure, the longitudinal section of the sealing piece 321 and the mounting part 322 is T-shaped, wherein the contact surface between the mounting part 322 and the air chamber pipe 200 has a certain curvature, so that the mounting part 322 fits tightly against the outer wall of the air chamber pipe 200.
[0092] According to an embodiment of this disclosure, when installing the sealing assembly into the reduction gap 210, the experimenter needs to first open the segmented reduction container 100, then insert the sealing piece 321 of the sealing assembly into the reduction gap 210, and then use the second screw to connect the mounting part 322 to the gas chamber pipe 200.
[0093] According to embodiments of this disclosure, in order to further improve the airtightness of the shock wave reduction device, a rubber gasket or similar material can be provided on the contact surface between the mounting part 322 and the air chamber pipe 200.
[0094] It should be noted that the size of the sealing plate 321 is as similar as possible to the size of the shock wave reduction gap 210 in order to improve the airtightness of the shock wave reduction device.
[0095] Figure 6 shows a physical illustration of the shock wave reduction device according to an embodiment of the present disclosure. In Figure 6(a), the reduction gap 210 is not equipped with a gap sealing structure 300, while in Figure 6(b), the reduction gap 210 is equipped with a gap sealing structure 300.
[0096] According to embodiments of this disclosure, a single-pulse shock system includes:
[0097] Single-pulse shock tube;
[0098] As shown in Figure 6, the shock wave reduction device has a first end of the air chamber pipe 200 connected to the diaphragm end of the single-pulse shock tube, and a second end of the air chamber pipe 200 connected to the driven end of the single-pulse shock tube.
[0099] In the case of gas injection and rupture at the diaphragm end of the single-pulse shock tube, the gas moves from the first end to the second end under the action of pressure difference. During the movement of the gas through the reduction gap 210 on the gas chamber pipe 200 and the second end, a reflected shock wave is formed. When the reflected shock wave moves towards the first end under the action of reflection, it enters the receiving cavity 101 in the shock wave reduction device through the reduction gap 210 on the gas chamber pipe 200 to perform multiple reflections and reductions on the reflected shock wave.
[0100] In one specific embodiment, to study the influence of the location and size of the sealing components on the suppression of reflected shock waves, the slot sealing structure 300 is divided into a short air ring (i.e., the second sealing component 320) and a long air ring (i.e., the first sealing component 310). In the configuration without air rings, the reflected shock wave can be effectively diffused through the 16 attenuation slots 210; conversely, when all slot sealing structures 300 are installed, there is no suppression effect on the reflected shock wave.
[0101] According to an embodiment of this disclosure, after connecting the shock wave reduction device to the single-pulse shock tube, gas is injected into the single-pulse shock tube. At this time, the pressure at the first end of the gas chamber pipe 200 is greater than the pressure at the second end. Under the action of this pressure difference, the injected gas flows towards the second end in the gas chamber pipe 200. During the flow, the gas forms a compression wave, which represents the flow pattern of the gas. After flowing a certain distance, a shock wave is formed between the reduction gap 210 and the second end. The shock wave forms a reflected shock wave under the action of reflection and moves towards the first end in the gas chamber pipe 200. At this time, the reflected shock wave enters the receiving cavity 101 through the reduction gap 210. The reflected shock wave gradually attenuates in the receiving cavity 101 through multiple reflections.
[0102] According to the embodiments of this disclosure, by setting multiple reduction gaps 210 on the gas chamber pipe 200 in the segmented reduction container 100, and setting a detachable gap sealing structure 300 on some of the reduction gaps 210, it is convenient that when using a single-pulse shock tube for experiments, the gas moves from the first end to the second end under the action of pressure difference to form a reflected shock wave. At this time, under the action of reflection, the reflected shock wave moves towards the first end and enters the receiving cavity 101 through the reduction gaps 210 to perform multiple reflections and reductions on the reflected shock wave, thereby realizing the absorption and control of the reflected shock wave and improving the accuracy of the experiment.
[0103] According to embodiments of this disclosure, the single-pulse shock system further includes:
[0104] Gas supply device, configured to supply gas; and / or
[0105] The gas handling device is configured to create a pressure difference so that gas moves from a first end to a second end under the action of the pressure difference.
[0106] According to embodiments of this disclosure, the gas supply device can be a gas cylinder or other instrument capable of increasing gas supply, such as an air compressor or air pump. The gas supplied can be specifically configured according to experimental requirements, such as nitrogen, air, oxygen, helium, hydrogen, carbon monoxide, or other combustible or non-combustible gases, without limitation herein.
[0107] According to embodiments of this disclosure, the gas processing device can be a gas collector or a gas ignition device, which can avoid causing pollution to the external environment.
[0108] According to embodiments of this disclosure, the single-pulse shock system further includes a pressure sensor installed at the second end of the air chamber conduit 200 to collect pressure data.
[0109] Figure 7 shows a comparison of the secondary pressure curves of the empty and full air rings and the conventional unloading section according to an embodiment of the present disclosure.
[0110] According to embodiments of this disclosure, under conditions without an air ring (i.e., gap sealing structure 300), the pressure drops significantly with the appearance of reflected rarefaction waves (i.e., reflected shock waves), and the second peak pressure of the reflected shock wave decreases from 248 kPa to 198 kPa, indicating that the shock wave damping device has a significant suppression effect on the reflected shock wave. However, under this condition, the pressure in the constant pressure zone of the reflected shock wave is significantly reduced, which may be due to the diffusion of the initial compression wave as it passes through the wave diffusion channel. Furthermore, a significant slope is observed in the pressure signal in the constant pressure zone, indicating that the boundary layer effect within the air chamber pipe 200 is more pronounced in the absence of an air ring. When only one air ring is removed, simulating the function of a conventional unloading tank, the results show that the shock wave damping device has a more significant suppression effect on secondary pressure rise.
[0111] In summary, the shock wave reduction device can effectively absorb and suppress reflected shock waves, and control the secondary peak pressure value after the reflected shock wave.
[0112] It should be noted that "no air ring" in Figure 7 means that no gap sealing structure 300 is installed, while "full air ring" means that all gaps 210 are equipped with gap sealing structures 300.
[0113] The embodiments of this disclosure have been described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of this disclosure. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. The scope of this disclosure is defined by the appended claims and their equivalents. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of this disclosure, and all such substitutions and modifications should fall within the scope of this disclosure.
Claims
1. A shock wave reduction device for a single-pulse shock tube, comprising: A segmented reduction container, wherein the segmented reduction container has a receiving cavity; A gas chamber pipe runs through the segmented reduction container. The first end of the gas chamber pipe is connected to the diaphragm end of the single-pulse shock tube, and the second end of the gas chamber pipe is connected to the driven end of the single-pulse shock tube. Multiple reduction gaps are provided on the gas chamber pipe located in the receiving cavity. Multiple gap-sealing structures are detachably installed on multiple of the aforementioned gap-reducing structures; In this process, when gas is injected into the single-pulse shock tube and the diaphragm end ruptures, the gas moves from the first end to the second end under the action of pressure difference. During the movement of the gas between the attenuation gap and the second end, a reflected shock wave is formed that moves toward the first end. By setting the gap sealing structure to block the number and position of the attenuation gaps, the reflected shock wave that enters the receiving cavity through the unsealed attenuation gap is subjected to multiple reflections and attenuation.
2. The apparatus according to claim 1, wherein, The shock wave attenuation device further includes: A first mounting flange is installed at the first end of the gas chamber pipe, and the gas chamber pipe is sealed to the diaphragm end through the first mounting flange; and / or A second mounting flange is installed at the second end of the gas chamber pipe, and the gas chamber pipe is sealed to the driven end through the second mounting flange.
3. The apparatus according to claim 1, wherein, The segmented reduction container includes: A receiving cylinder, wherein the receiving cavity is formed on one side of the receiving cylinder; The receiving cover is sealed to the receiving cylinder.
4. The apparatus according to claim 3, wherein, The receiving cover is sealed to the receiving cylinder by a first screw.
5. The apparatus according to claim 3 or 4, wherein, The segmented reduction container also includes: A sealing ring is used to seal the receiving cover plate to the receiving cylinder.
6. The apparatus according to claim 1, wherein, The straight line containing the gap reduction is at a preset angle to the central axis of the air chamber pipe; Preferably, the preset angle is 0°.
7. The apparatus according to claim 1 or 6, wherein, The gap sealing structure includes: A first sealing assembly and a second sealing assembly are installed in contact with the outer wall of the gas chamber pipe when the gap is reduced, wherein the length of the first sealing assembly is greater than the length of the second sealing assembly; The gap is completely sealed by the first sealing component and the second sealing component, or the gap is partially sealed by the first sealing component or the second sealing component.
8. The apparatus according to claim 7, wherein, Each of the first and second blocking assemblies includes: The sealing plate is configured to be inserted into the reduction gap; The mounting part is connected to the sealing piece, and the mounting part is configured to fit against the outer wall of the air chamber pipe; Preferably, the mounting part is detachably connected to the air chamber pipe by a second screw.
9. A single-pulse shock wave system, comprising: Single-pulse shock tube; The shock wave reduction device according to any one of claims 1 to 8, wherein the first end of the gas chamber pipe in the shock wave reduction device is connected to the diaphragm end of the single-pulse shock tube, and the second end of the gas chamber pipe is connected to the driven end of the single-pulse shock tube. In this process, when gas is injected into the single-pulse shock tube and the diaphragm end ruptures, the gas moves from the first end to the second end under the action of pressure difference. During the movement of the gas through the reduction gap in the gas chamber pipe and the second end, a reflected shock wave is formed. When the reflected shock wave moves towards the first end under the action of reflection, it enters the receiving cavity in the shock wave reduction device through the reduction gap in the gas chamber pipe to perform multiple reflections and reductions on the reflected shock wave.
10. The system according to claim 9, wherein, The single-pulse shock wave system also includes: A gas supply device is configured to supply the gas; and / or A gas handling device is configured to create a pressure difference so that the gas moves from the first end to the second end under the action of the pressure difference.