A method for collecting and processing detonation wave cellular structure
By using kerosene lamps to smoke the smoke film sheets and flushing and wet degreasing cotton in the detonation wave experiment, the problem of insufficient heat resistance of the polyester film is solved, and the clear collection and accurate measurement of the cell structure is achieved, and the detonation is carried out to achieve detonation. The engine design provides accurate experimental data.
Patent Information
- Application Number
- CN202210988142.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-08-17
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2042-08-17
AI Technical Summary
When collecting the cell structure of detonation waves, the polyester film has low heat resistance and is prone to deformation due to high temperatures, which affects the observation results, and the film may be damaged during the experiment, resulting in inaccurate data.
Use kerosene lamp to smoke smoke film sheets, combined with ignitor, gas mixing tank, pressure gauge, spoiler, vacuum pump, smoked smoke film sheets and sealing flange, trigger the experiment through the ignition of the pre-mixed gas, and the smoke film sheets are combined with the smoke film sheets. Perform flushing and wet cotton treatment to ensure clear collection and measurement of the cell structure.
It effectively prevents the movement and deformation of the smoke membrane sheet, ensures clear collection and accurate measurement of the cell grid structure, provides accurate and reliable cell grid size data, and provides reliable experimental data for the design of the detonation engine.
Smart Images
Figure CN115389204B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to an experimental method, in particular to a detonation engine experimental method. Background Art
[0002] Detonation engines have the advantages of low entropy increase, high thermodynamic cycle efficiency, and large specific impulse, and have become a hot research topic in the world today. When stable detonation combustion is formed in a detonation engine, the detonation wave can propagate self-sustainingly through a complex three-dimensional structure, which is the cell. The cell size λ is one of the important characteristic parameters of the mixed gas and is the standard for judging the detonation sensitivity of the mixed gas. At the same time, the critical size of the detonation engine, other dynamic parameters during the propagation of the detonation wave, the explosion limit, and the critical direct detonation energy can all be obtained by combining the cell size λ. Therefore, it is crucial to clearly collect the cell structure during the stable propagation of the detonation wave and accurately measure the cell size λ for the design of the detonation engine.
[0003] The smoke film method is usually used to collect the cellular structure of the detonation wave, that is, to smoke fine carbon particles and other combustion products on the polyester film. When the detonation wave sweeps the film, the film will collect the fish-scale cellular structure. However, because the polyester film has low heat resistance, the high temperature generated during the detonation combustion will cause the film to deform, thereby affecting the observation of the cellular structure of the detonation wave, and even the film is likely to be destroyed during the smoking and experimental process. Summary of the invention
[0004] The object of the present invention is to provide a method for collecting and processing a detonation wave cellular structure, which can effectively, clearly and accurately collect and measure a detonation wave.
[0005] The object of the present invention is achieved in that:
[0006] The present invention provides a method for collecting and processing a detonation wave cellular structure, which is characterized by:
[0007] (1) Use a kerosene lamp to smoke the smoke film;
[0008] (2) Install an igniter, a mixed gas tank, a pressure gauge, a spoiler, a vacuum pump, a smoked smoke film sheet, a smoke film baffle and a sealing flange on the detonator;
[0009] (3) Fill the detonator with premixed gas and trigger the detonation experiment with the igniter;
[0010] (4) flushing the cigarette film sheet;
[0011] (5) Wiping the cigarette film sheet with wet absorbent cotton;
[0012] (6) Monitor the detonation wave structure and measure the cell size λ.
[0013] The present invention may also include:
[0014] 1. In step (1), the smoke film is made of 304 steel with a thickness of 1 mm. During the smoking process, the smoke film is continuously moved back and forth to ensure that the particles after the kerosene combustion are evenly adsorbed on the surface of the smoke film. The distance between the smoke film and the flame front is maintained at 200-300 mm. The smoking time is 10-15 minutes.
[0015] 2. In step (2), an igniter and a pressure gauge are connected to the detonator tube, the mixed gas tank is connected to the detonator tube through a fuel-oxidant mixed gas passage, the vacuum pump is connected to the detonator tube through a channel, a spoiler and a spoiler fixing column form a spoiler, the blocking ratio and spacing of the spoiler are adjusted according to the characteristics of the mixed gas of different components, the smoked smoke film sheet is fixed to the tail end of the detonation tube by the last spoiler, two spoiler fixing columns and a smoke film baffle, so that the smoke film sheet is closely attached to the inner wall surface of the detonator tube, and then a sealing film and a sealing flange are installed at the tail end of the detonator.
[0016] 3. In step (3), a vacuum pump is used to extract air from the passage in the detonator to keep it in a vacuum state, and then a premixed fuel and oxidant mixture is sprayed into the fuel-oxidant mixture passage. After it comes to rest, the experiment is triggered by an igniter.
[0017] 4. In step (4), water is flushed from the side of the smoke film sheet close to the obstacle to the side close to the initiator outlet, i.e., along the propagation direction of the detonation wave. When flushing the smoke film sheet, the flushing time is 10-15 seconds to prevent large particles of smoke from destroying the detonation wave structure in subsequent treatment.
[0018] 5. In step (5), the surface of the cigarette film sheet is wiped with wet absorbent cotton along the propagation direction of the detonation wave for 3 to 5 times to remove excess residual particles attached to the surface of the cigarette film sheet.
[0019] 6. In step (6), when measuring the cell size λ, select the middle area of the cigarette film sheet, measure 5 to 10 cells, and take the average value as the cell size λ.
[0020] The advantages of the present invention are as follows: while ensuring that detonation waves of mixed gases of different components can be collected in the detonator, the present invention effectively prevents the movement and deformation of the smoke film sheet, can clearly collect the cellular structure of the detonation wave, accurately measure the cellular size λ, and provide accurate and reliable experimental data for the design of the detonation engine. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 The process of the present invention;
[0022] Figure 2 It is a front cross-sectional view of the detonator of the present invention;
[0023] Figure 3 It is the cross-sectional view of the detonator in the L and R directions. DETAILED DESCRIPTION
[0024] The present invention is described in more detail below with reference to the accompanying drawings:
[0025] Combination Figure 1-3 , Figure 1 A flow chart showing a method for collecting and processing a detonation wave cellular structure according to an embodiment of the present invention is shown. Figure 2 Show Figure 1 The experimental devices involved in the process include: detonator 1, igniter 2, fuel-oxidant mixture passage 3, pressure gauge 4, spoiler 5, passage 6, smoke film sheet 7, sealing film 8, smoke film baffle 9, and sealing flange 10.
[0026] When the gas explosion wave cell collection and processing of the present invention starts working:
[0027] Step 1: Use a kerosene lamp to smoke the smoke film sheet 7. The smoke film sheet is made of 304 steel with a thickness of 1 mm. It should be noted that during the smoke film smoking process, the smoke film sheet 7 is continuously and slowly moved back and forth, and the distance between the smoke film sheet 7 and the flame front is maintained at 200-300 mm. The smoking time is 10-15 minutes to ensure that the smoke film is evenly attached and has a moderate thickness, which is conducive to the collection of the detonation wave.
[0028] Step 2: connect the igniter 2 and the pressure gauge 4 to the detonator 1, the channel 3 is connected to the mixed gas tank, the channel 6 is connected to the vacuum pump, and the spoiler is composed of a spoiler 5 and a spoiler fixing column 11. The blocking ratio and spacing of the spoiler can be adjusted according to the characteristics of the mixed gas of different components to form an optimal spoiler combination, which promotes the faster formation of the detonation wave and its stable propagation in the detonator. The smoked smoke film sheet 7 is fixed to the tail end of the detonation tube by the last spoiler 5, two spoiler fixing columns 11 and the smoke film baffle 9. This design can make the smoke film sheet 7 close to the inner wall surface of the detonation tube, avoiding the interference problem of the detonation process on the smoke film sheet 7. Then install the sealing film 8 and the sealing flange 10 to ensure good sealing in the detonator.
[0029] Step 3: Use a vacuum pump to extract the air in the detonator from passage 6 to keep it in a vacuum state, and then inject the pre-mixed fuel and oxidant mixed gas through the mixed gas passage 3. After a period of rest, the experiment is triggered by the igniter 2.
[0030] Step 4: After the detonation experiment, take out the cigarette film sheet 7. Since a large number of residual particles are attached to the cigarette film sheet 7, which affects the measurement of the cell size λ, the cigarette film sheet 7 needs to be processed to accurately measure the cell size λ. Use clean water to gently rinse the cigarette film sheet 7 from the side close to the obstacle to the outlet of the detonator (i.e., along the propagation direction of the detonation wave). The rinsing time is 10-15 seconds. In this way, large particles of ash attached to the surface of the cigarette film sheet can be washed away to prevent large particles of ash from destroying the cell structure in subsequent processing.
[0031] Step 5: Use wet absorbent cotton to gently wipe the surface of the smoke film sheet 7 along the propagation direction of the detonation wave for 3 to 5 times to remove excess residual particles attached to the surface of the smoke film sheet.
[0032] Step 6, measuring the cell size λ. After the above treatment, the smoke film sheet 7 shows a fish-scale cell structure. It should be noted that when measuring the cell size λ, the middle area of the smoke film sheet 7 should be measured, and the cells near the spoiler sheet should not be measured, because the cells near the spoiler sheet will change due to the influence of the spoiler on the propagation of the detonation wave, and thus the cell size λ cannot be truly reflected. Measure 5 to 10 cells and take the average value as the cell size λ.
[0033] As can be seen from the above, the present invention discloses a method for collecting and processing a detonation wave cellular structure. The detonation wave cellular collection and processing method according to an embodiment of the present invention can collect detonation waves of premixed gases of different components, effectively preventing the movement and deformation of the smoke film sheet, and by subjecting the smoke film sheet to a water flushing treatment and a wet absorbent cotton treatment, the cellular structure of the detonation wave can be clearly collected, and the cellular size λ can be accurately measured, thereby providing accurate and reliable experimental data for the design of a detonation engine.
Claims
1. A method for collecting and processing detonation wave cellular structure, characterized in that: The following steps are involved: (1) Use a kerosene lamp to smoke the smoke film sheet. During the smoking process, the smoke film sheet is constantly moved back and forth to ensure that the particles after the kerosene combustion are evenly adsorbed on the surface of the smoke film sheet. The distance between the smoke film sheet and the flame front is maintained at 200-300 mm. The smoking time is 10-15 minutes; (2) Install an igniter, a mixed gas tank, a pressure gauge, a spoiler, a vacuum pump, a smoked smoke film sheet, a smoke film baffle and a sealing flange on the detonator; An igniter and a pressure gauge are connected to the detonator tube, the mixed gas tank is connected to the detonator tube through a fuel-oxidant mixed gas passage, the vacuum pump is connected to the detonator tube through a passage, a spoiler and a spoiler fixing column form a spoiler, and the blocking ratio and spacing of the spoiler are adjusted according to the characteristics of mixed gases of different components; The smoked smoke film sheet is fixed to the tail end of the detonator tube by the last spoiler, two spoiler fixing columns and the smoke film baffle, so that the smoke film sheet is closely attached to the inner wall surface of the detonator tube, and then the sealing film and sealing flange are installed at the tail end of the detonator; (3) Fill the detonator with premixed gas and trigger the detonation experiment with the igniter; Use a vacuum pump to extract the air in the detonator from the passage to keep it in a vacuum state, and then inject the pre-mixed fuel and oxidant mixture gas through the fuel-oxidant mixture passage. After a period of rest, the experiment is triggered by the igniter; (4) After the detonation experiment, the cigarette film sheet is taken out and flushed with water; Flushing is performed from the side of the smoke film sheet close to the obstacle to the side close to the initiator outlet, i.e., along the propagation direction of the detonation wave. When flushing the smoke film sheet, the flushing time is 10-15 seconds to flush away the large particles of soot attached to the surface of the smoke film sheet to prevent the large particles of soot from destroying the detonation wave structure in subsequent processing; (5) Use wet absorbent cotton to gently wipe the surface of the smoke film sheet along the propagation direction of the detonation wave for 3 to 5 times to remove excess residual particles attached to the surface of the smoke film sheet; (6) After being processed in steps (1) to (5), the cigarette film sheet shows a fish-scale cellular structure; when measuring the cellular size λ, the middle area of the cigarette film sheet should be measured, and the cellular cells near the spoiler sheet should not be measured. 5 to 10 cellular cells should be measured, and the average value is taken as the cellular size λ.
2. The method for collecting and processing the cellular structure of a detonation wave according to claim 1 is characterized by: In step (1), the smoke film sheet is made of 304 steel with a thickness of 1 mm.