Gas non-homogeneous detonation experimental device with nanometer film

Abstract

The application discloses a gas non-uniformity detonation experimental device with a nano film, which is characterized in that: the detonation tube is divided into two sections by an isolation plug, the gas in the front section of the detonation tube is uniform, the rear section of the detonation tube is divided into two chambers by a nano film and is filled with different gases, the gas in the rear section of the detonation tube is non-uniform; the isolation plug plays a separating role in the gas filling stage, and the isolation plug is pulled out in the experiment to make the front and rear sections communicate; in the experiment, the detonation wave enters the non-uniform section from the uniform gas in the front section of the detonation tube, the propagation experiment of the detonation wave in the gas containing a sharp non-uniform interface is realized, and an observation window is arranged on the detonation tube, so that the propagation behavior of the detonation wave at the non-uniform interface is recorded through the observation window. The experimental device can create a non-uniform gas interface and has good air tightness.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of detonation experiment, in particular to a gas non-uniformity detonation experiment device with nano film. BACKGROUND

[0002] Gas detonation is a highly violent chemical reaction phenomenon that occurs in a mixture of combustible gas and oxidizer. When the ignition source ignites the mixture, the reaction rapidly propagates, producing extremely high temperature and pressure. During the detonation process, the detonation wave propagates at supersonic speed, and the shock wave formed causes the energy to rapidly diffuse, resulting in explosive release. This process not only involves complex chemical kinetics, but also accompanies high-speed fluid dynamics effects. Gas detonation has important applications in both industrial and military fields, but at the same time, it also requires high safety precautions to avoid accidents.

[0003] Currently, the research on gas detonation phenomenon mainly focuses on the propagation behavior of detonation wave in homogeneous gas. A large number of experiments and theoretical models have revealed the propagation characteristics of detonation wave in homogeneous gas environment, providing important reference for understanding its basic mechanism. However, the propagation phenomenon of detonation wave in non-uniform gas is relatively less studied. The complexity of non-uniform gas, including concentration gradient, temperature distribution and composition unevenness, makes its detonation process more complex and difficult to predict.

[0004] At present, further experimental research is needed to fully understand the behavior of detonation wave in non-uniform gas. SUMMARY

[0005] In order to explore the propagation phenomenon of detonation wave in non-uniform gas medium and create a non-uniform gas interface, the present application provides a gas non-uniformity detonation experiment device with nano film, which can create a non-uniform gas interface and has good air tightness.

[0006] In order to achieve the above purpose, the present application adopts the following specific technical solutions:

[0007] A gas non-uniformity detonation experiment device with nano film, the experiment device comprises a pre-detonation tube, a detonation tube, an isolation plugboard, an observation window, a film frame and a nano film;

[0008] The detonation tube is a square tube with a closed front end and a rear end sealed with an end plate;

[0009] The isolation plugboard is pluggably installed in the detonation tube, dividing the internal cavity of the detonation tube into a front section and a rear section; the front section is filled with homogeneous gas; the rear section is filled with non-uniform gas; the isolation plugboard plays a separating role during the inflation stage;

[0010] The pre-explosion tube has a round hole at one end and is vertically installed at the front end of the explosion tube; the round hole is used for installing an igniter; the pre-explosion tube is filled with combustible gas;

[0011] A horizontal film frame is installed in the rear section pipeline between the end plate and the isolation insert plate, the film frame supports the nanometer film, and the film frame and the nanometer film form a nanometer film interface; the observation windows are installed in the wall of the explosion tube on both sides of the film frame; the film frame is sealingly connected with the isolation insert plate, the end plate, the explosion tube and the observation windows, so as to divide the inner cavity of the rear section pipeline into an upper cavity and a lower cavity; the end plate is provided with an upper through hole communicating with the upper cavity and a lower through hole communicating with the lower cavity, two different gases are injected into the upper cavity and the lower cavity through the upper through hole and the lower through hole respectively, and a non-uniform gas chamber is formed in the rear section pipeline.

[0012] Further, grooves are arranged on the inner wall of the explosion tube and the observation window;

[0013] The film frame is inserted into the grooves in interference fit;

[0014] Sealing rings are installed between the film frame and the observation window, the isolation insert plate, the end plate and the inner wall of the explosion tube, and sealing glue is applied to ensure air tightness.

[0015] Further, the thickness of the nanometer film is 100±10 nm.

[0016] Further, the material of the film frame is rubber; and the observation window is made of quartz glass.

[0017] Further, a spiral structure is arranged in the pre-explosion tube to accelerate the formation of strong explosion wave.

[0018] Further, the pre-explosion tube is made of alloy steel to withstand large explosion pressure.

[0019] Further, the explosion tube is made of aluminum alloy.

[0020] Further, a high-speed photography device and a schlieren device are arranged outside the observation window, and the high-speed photography device and the schlieren device are used to record the behavior characteristics of the explosion wave.

[0021] Further, the preparation method of the nanometer film is as follows:

[0022] A nitrocellulose solution is prepared, and the main components of the nitrocellulose solution are nitrocellulose, castor oil, isopropyl palmitate and camphor;

[0023] The quality of the nitrocellulose solution required for the nanometer film;

[0024] The nitrocellulose solution is dropped on distilled water;

[0025] The nanometer film is fished and stored by using the film frame;

[0026] The film thickness is checked by using interference color.

[0027] Compared with the prior art, the technical scheme of the present application has the following beneficial effects:

[0028] The gas non-uniformity explosion experiment device of the present application uses an isolation plug to divide the detonation tube into two sections, the gas in the front section of the detonation tube is uniform, the rear section of the detonation tube is divided into two chambers by using a nanometer film and is filled with different gases, the gas in the rear section of the detonation tube is non-uniform; the isolation plug plays a separating role during the filling stage, and the isolation plug is pulled out during the experiment to make the front and rear sections communicate; during the experiment, the detonation wave enters the non-uniform section from the uniform gas in the front section of the detonation tube, realizing the propagation experiment of the detonation wave in the gas containing a "sharp non-uniform interface", and an observation window is installed on the detonation tube, so that the propagation behavior of the detonation wave at the non-uniform interface is recorded through the observation window.

[0029] The gas non-uniformity explosion experiment device of the present application realizes the filling of different fluid regions in the detonation tube by the "chamber division" filling method, which cannot be realized by the traditional single-chamber detonation tube. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the gas non-uniformity explosion experiment device of the present application;

[0031] Figure 2 It is an explosion structural schematic diagram of the gas non-uniformity explosion experiment device of the present application;

[0032] Figure 3 It is a structural schematic diagram of the pre-detonation tube;

[0033] Figure 4 It is a structural schematic diagram of the detonation tube;

[0034] Figure 5 It is a structural schematic diagram of the isolation plug;

[0035] Figure 6 It is a structural schematic diagram of the tail sealing plate;

[0036] Figure 7 It is a structural schematic diagram of the nanometer film frame;

[0037] Figure 8 It is a sectional view of the device;

[0038] Figure 9 It is a schematic diagram of the manufacturing principle of the nano film;

[0039] Figure 10 It is a schematic diagram of the fishing process of the nano film;

[0040] Figure 11 It is a physical diagram of the nano film.

[0041] Wherein, 1-pre-detonation tube, 2-detonation tube, 3-isolation plug, 4-observation window, 5-end plate, 6-film frame, 7-round hole, 8-mounting hole, 9-window, 10-groove, 11-sealing ring, 12-upper through hole, 13-lower through hole, 14-nano film, 15-suction tube, 16-nitric acid fiber solution, 17-distilled water. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0043] The present embodiment provides a gas non-uniformity detonation experimental device with a nano film 14, as shown in the structures of Figure 1 and Figure 2 The experimental device comprises a pre-detonation tube 1, a detonation tube 2, an isolation plug 3, an observation window 4, a film frame 6, and a nano film 14.

[0044] As shown in Figure 1 , Figure 2 and Figure 4 The detonation tube 2 is a square tube with a closed front end and a rear end sealed with an end plate 5; the end plate 5 is detachably installed at the rear end of the square tube to close the rear end of the square tube; the detonation tube 2 is made of aluminum alloy; the detonation tube 2 is the main part for observing the propagation behavior of the detonation wave.

[0045] The isolation plug 3 is plug-inly installed in the detonation tube 2 to divide the internal cavity of the detonation tube 2 into a front section and a rear section; the front section is filled with uniform gas; the rear section is filled with non-uniform gas; the isolation plug 3 plays a separating role during the gas filling stage; before the experiment, the isolation plug 3 is inserted into the detonation tube 2 to divide the internal cavity of the detonation tube 2 into two parts; when the experiment is performed, the isolation plug 3 is pulled out when the pre-detonation tube 1 is ignited; as shown in Figure 5 The isolation plug 3 is provided with a lug, by which the isolation plug 3 can be manually or automatically pushed and pulled to realize the gas filling and sealing before the experiment and the pulling out of the isolation plug 3 during the experiment;

[0046] As shown in Figure 1 and Figure 3 , one end of the pre-detonation tube 1 is provided with a round hole 7, and the other end is vertically installed at the front end of the detonation tube 2; the round hole 7 is used for installing an igniter; the pre-detonation tube 1 is filled with combustible gas; the front end of the detonation tube 2 is provided with a mounting hole 8 which is a circular hole matched with the shape of the pre-detonation tube 1, facilitating the insertion of the pre-detonation tube 1; the inside of the pre-detonation tube 1 is provided with a spiral structure for accelerating the formation of a strong detonation wave; the pre-detonation tube 1 is made of alloy steel material for bearing large detonation pressure. The pre-detonation tube 1 is vertically connected with the detonation tube 2, which can reduce the overall length of the experimental device. The pre-detonation tube 1 provides a length space for forming a stable detonation wave, and the side is connected with a gas path to fill in the premixed detonation driving gas.

[0047] As shown in Figure 2 and Figure 8 , a horizontal film frame 6 is installed in the rear section pipeline between the end plate 5 and the isolation insert plate 3, as shown in Figure 7 , the film frame 6 supports a nanometer film 14, and the film frame 6 and the nanometer film 14 form the nanometer film 14 interface; the material of the film frame 6 is rubber; the thickness of the nanometer film 14 is 100±10nm, so that the nanometer film 14 can isolate the gas medium and not affect the detonation wave front structure; the length of the nanometer film 14 can be 15cm, and the width can be 3cm.

[0048] As shown in Figure 1 , observation windows 4 are installed in the pipe walls of the detonation tube 2 on both sides of the film frame 6; the observation windows 4 are made of quartz glass; the film frame 6 is sealingly connected with the isolation insert plate 3, the end plate 5, the detonation tube 2 and the observation windows 4, dividing the inner cavity of the rear section pipeline into an upper cavity and a lower cavity; the end plate 5 is provided with an upper through hole 12 communicating with the upper cavity and a lower through hole 13 communicating with the lower cavity, and two different gases are injected into the upper cavity and the lower cavity through the upper through hole 12 and the lower through hole 13 respectively, forming a non-uniform gas chamber in the rear section pipeline; for example, a uniform mixture of hydrogen and oxygen gas is filled in the front section pipeline, hydrogen is injected into the upper cavity in the rear section pipeline, and oxygen is injected into the lower cavity in the rear section pipeline.

[0049] Gas pipelines are connected to the front section pipeline of the uniform gas section of the detonation tube 2 and the upper and lower cavities of the non-uniform gas section of the rear section pipeline to extract vacuum and fill gas.

[0050] In order to facilitate the installation of the nanometer film 14 in the detonation tube 2, as shown in Figure 4 and Figure 8As shown, grooves 10 are provided on the inner wall of the detonation tube 2 and the observation window 4; the film frame 6 is inserted into the grooves 10 in an interference fit; sealing rings 11 are installed between the film frame 6 and the observation window 4, the isolation plug 3, the end plate 5 and the inner wall of the detonation tube 2, and sealing glue is applied to ensure air tightness. The grooves 10 of the observation window 4 and the grooves 10 of the inner wall of the detonation tube 2 together form a film frame 6 for placing the nano-film 14. In order to ensure the air tightness of the film frame 6 on both sides, the film frame 6 needs to be made of a material such as rubber that has elasticity, and the film frame 6 is sealed and installed in the grooves 10 with sealing glue.

[0051] The above experimental device also includes a high-speed photography device and a schlieren device provided outside the observation window 4, which are used to record the behavior characteristics of the detonation wave.

[0052] The preparation method of the nano-film 14 in the above experimental device is as follows: nitrocellulose solution 16 is prepared, the main components of the nitrocellulose solution 16 are nitrocellulose, castor oil, isopropyl palmitate and camphor; the mass of the nitrocellulose solution 16 required by the nano-film 14 is calculated; as shown in FIG. 4, the nitrocellulose solution 16 is dropped on distilled water 17; as shown in FIG. 5, the nano-film 14 is fished and stored with the film frame 6; the film thickness is tested by interference color, as shown in FIG. 6. Figure 9 Figure 10 Figure 11

[0053] The above gas non-uniform detonation experimental device divides the detonation tube 2 into two sections by the isolation plug 3, the gas in the front section of the detonation tube 2 is uniform, the nano-film 14 is used to divide the rear section of the detonation tube 2 into two chambers and different gases are filled into the two chambers respectively, the gas in the rear section of the detonation tube 2 is non-uniform; the isolation plug 3 plays a separating role during the gas filling stage, and the isolation plug 3 is pulled out during the experiment to make the front and rear sections communicate for the experiment; during the experiment, the detonation wave enters the non-uniform section from the uniform gas in the front section of the detonation tube 2, realizing the propagation experiment of the detonation wave in the gas containing "sharp non-uniform interface", and the observation window 4 is installed on the detonation tube 2, so that the propagation behavior of the detonation wave at the non-uniform interface is recorded through the observation window 4, and the behavior characteristics of the detonation wave can also be recorded through the high-speed photography device and the schlieren device through the observation window 4. The propagation behavior of the detonation wave at the non-uniform interface is the observation target of the experimental device.

[0054] The above gas non-uniform detonation experimental device realizes the filling of different fluid regions in the detonation tube 2 by the "chamber division" gas filling method, which is not achievable by the traditional single-chamber detonation tube 2.

[0055] ​​​The stage of gas preparation is divided into the following steps: firstly, close the isolation plug 3, close the opening of the pre-detonation tube 1, and use a vacuum pump to vacuum the uniform section of the pre-detonation tube 1 and the detonation tube 2; then, connect the two vacuum pumps to the gas chambers on both sides of the nanometer film 14 interface, and use a barometer to measure and control the two vacuum pumps to slowly and balancedly pump out the gas in the two gas chambers; finally, sequentially fill the detonation driving gas, the uniform section gas, and the non-uniform section gas.

[0056] The operation steps of the experiment using the above gas non-uniform detonation experiment device are as follows:

[0057] Step one: sequentially assemble the detonation tube 2, smear sealant, install the sealing ring 11, install the igniter, and debug the schlieren device;

[0058] Step two: prepare the nanometer film 14, insert the film frame 6 into the detonation tube 2, install the end plate 5 at the rear end of the detonation tube 2, and close the rear end of the detonation tube 2;

[0059] Step three: insert the isolation plug 3 into the detonation tube 2, and open the vacuum pump to vacuum the pre-detonation tube 1 and the detonation tube 2;

[0060] Step four: sequentially fill combustible gas into different parts of the pre-detonation tube 1 and the detonation tube 2;

[0061] Step five: close the gas circuit, remove the isolation plug 3, start the camera shutter, count down the igniter switch, and start the oscilloscope to collect signals;

[0062] Step six: the igniter initiates detonation, and the recording device records the detonation process.

[0063] Obviously, those skilled in the art can make various modifications and variations to the embodiments of the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A device for non-homogeneous detonation of a gas with a nanofilm, characterized in that, The device comprises a pre-detonation tube, a detonation tube, an isolation plug, an observation window, a film frame and a nano-film. The detonation tube is a square tube with a closed front end and a rear end sealed with an end plate. The isolation plug is pluggably installed in the detonation tube to divide the internal cavity of the detonation tube into a front section and a rear section; the front section is filled with uniform gas; the rear section is filled with non-uniform gas; the isolation plug plays a separating role in the inflation stage. One end of the pre-detonation tube is provided with a round hole, and the other end is perpendicularly installed at the front end of the detonation tube; the round hole is used for installing an igniter; the pre-detonation tube is filled with combustible gas. A horizontal film frame is installed in the rear section between the end plate and the isolation plug, and the nano-film is supported on the film frame; the film frame and the nano-film form a nano-film interface; the observation windows are installed in the tube wall of the detonation tube on both sides of the film frame; the film frame is sealingly connected with the isolation plug, the end plate, the detonation tube and the observation windows to divide the internal cavity of the rear section into an upper cavity and a lower cavity; the end plate is provided with an upper through hole communicating with the upper cavity and a lower through hole communicating with the lower cavity, and two different gases are injected into the upper cavity and the lower cavity through the upper through hole and the lower through hole respectively to form a non-uniform gas chamber in the rear section.

2. The experimental set-up of claim 1, wherein, Grooves are arranged on the inner wall of the detonation tube and the observation window; The film frame is inserted into the grooves in interference fit; Sealing rings are installed between the film frame and the observation window, the isolation plug, the end plate and the inner wall of the detonation tube, and sealing glue is applied to ensure air tightness.

3. The experimental set-up of claim 1, wherein, The thickness of the nano-film is 100±10 nm.

4. The experimental set-up of claim 1, wherein, The material of the film frame is rubber, and the observation window is made of quartz glass.

5. The experimental set-up of claim 1, wherein, A spiral structure is arranged in the pre-detonation tube to accelerate the formation of a strong detonation wave.

6. The experimental set-up of claim 1, wherein, The pre-detonation tube is made of alloy steel to withstand a large detonation pressure.

7. The experimental set-up of claim 1, wherein, The detonation tube is made of aluminum alloy.

8. An experimental set-up according to any one of claims 1-7, characterized in that A high-speed photography device and a schlieren device are arranged outside the observation window to record the behavior characteristics of the detonation wave.

9. An experimental set-up according to any one of claims 1-7, characterized in that The preparation method of the nano-film is as follows: A nitrocellulose solution is prepared, and the main components of the nitrocellulose solution are nitrocellulose, castor oil, isopropyl palmitate and camphor; The mass of the nitrocellulose solution required for the nano-film is calculated; The nitrocellulose solution is dropped on distilled water; The nano-film is fished out and placed in the film frame; The film thickness is checked by interference color.

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