Stationary oblique detonation wave cell structure measuring system and method

Abstract

The invention discloses a stationary oblique detonation wave cell structure measurement system and method, and the system comprises an experiment module, two ends of the experiment module are respectively provided with an inlet hole and an outlet hole, the inlet hole and the outlet hole are provided with membranes for sealing the experiment module, and the experiment module is pre-filled with combustible gas; the projectile launching device is arranged at one end of the experiment module and used for accelerating a projectile to a target speed and then launching the projectile into the experiment module from the inlet hole, the projectile is ejected from the outlet hole, and the projectile with the target speed makes contact with the combustible gas in the experiment module to be detonated and induces oblique detonation waves to occur; the smoke trace plates are arranged in the experiment module and distributed in the circumferential direction and / or the axial direction of a trajectory where the projectile enters the experiment module, and the surfaces of the smoke trace plates make contact with generated oblique detonation waves and are subjected to flowing strafing to form cells. According to the invention, the smoke trace plate can be adaptively arranged according to the flow field characteristics of oblique waves and bombardment waves, so that the accurate cell form and size can be captured.

Description

Technical Field

[0001] The invention relates to the technical field of detonation wave cell measurement, and in particular to a system and method for measuring a stationary oblique detonation wave cell structure. Background Art

[0002] Detonation waves are a physical phenomenon of strong shock waves coupled with chemical reactions. Detonation waves can propagate self-sustainingly through complex three-dimensional structures, and this complex three-dimensional structure 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 trail method is usually used to collect the cellular structure of the detonation wave, that is, to smoke tiny carbon particles and other combustion products on a polyester film. When the detonation wave sweeps the film, the film will collect the fish-scale cellular structure.

[0004] The existing detonation wave cellular measurement method is mainly aimed at self-sustaining propagating detonation waves propagating in confined space and free space. A pre-smoked smoke plate is installed on the wall of the detonation test cabin. In the experiment, the self-sustaining propagating detonation wave washes the smoke plate and leaves a cellular structure record on it. However, for stationary oblique detonation waves, since their cellular space distribution is uneven and the existing measurement methods are mostly through directly igniting the combustible gas in the space, it is impossible to ensure that their position and propagation direction stably sweep over the surface of the plate of the collection cell. Summary of the invention

[0005] The purpose of the present invention is to provide a system and method for measuring the cellular structure of a stationary oblique detonation wave, so as to solve the technical problem in the prior art that, since the existing measurement methods are mostly by directly igniting the combustible gas in the space, it is impossible to ensure that its position and propagation direction stably sweep across the surface of the plate of the collection cell.

[0006] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0007] A stationary oblique detonation wave lattice structure measurement system, comprising:

[0008] An experimental cabin, wherein an inlet hole and an outlet hole are respectively arranged at both ends of the experimental cabin, a diaphragm is arranged on the inlet hole and the outlet hole for sealing the experimental cabin, and combustible gas is pre-filled in the experimental cabin;

[0009] A projectile launching device is arranged at one end of the experimental chamber, and is used to accelerate the projectile to a target speed and then launch it from the inlet hole into the experimental chamber, and the projectile is ejected from the outlet hole, and the projectile with the target speed contacts and detonates with the combustible gas in the experimental chamber, thereby inducing an oblique detonation wave;

[0010] The smoke plates include a plurality of plates which are arranged in the experimental chamber and distributed in the circumferential and / or axial directions of the trajectory of the projectile entering the experimental chamber. The surfaces of the smoke plates are contacted with the generated oblique detonation waves and are ablated to form cells.

[0011] As a preferred solution of the present invention, the smoke plate is installed in the experimental cabin through a supporting device, and the supporting device can adjust the angle of the smoke plate relative to the trajectory.

[0012] As a preferred solution of the present invention, a buffer cavity is provided at one end of the experimental chamber, and the projectile launching port of the projectile launching device is located in the buffer cavity, and there is a gap between the projectile launching port and the inlet hole;

[0013] Wherein, the inlet hole and the outlet hole are provided with diaphragms in the initial state.

[0014] As a preferred solution of the present invention, the smoke plate comprises an arc-shaped aluminum plate body, and the supporting devices are arranged on both sides of the arc-shaped aluminum plate body.

[0015] The present invention provides a measurement method based on the stationary oblique detonation wave lattice structure measurement system, comprising the following specific steps:

[0016] Step 100, multiple arc-shaped smoke plates are installed in the experimental cabin through a supporting device, and the inlet and outlet holes of the projectiles opened on the experimental cabin are sealed with a diaphragm sheet, and then a mixed gas of hydrogen and oxygen with a mixing ratio of 3:1 is injected into the experimental cabin;

[0017] Step 200, using a projectile launching device to accelerate the projectile to a speed greater than the CJ detonation speed of the mixed gas, and launching the projectile into the experimental chamber from the inlet hole of the experimental chamber, thereby inducing an oblique detonation wave in the combustible gas in the experimental chamber;

[0018] Step 300: Take out the smoke plate ablated by the oblique detonation wave in the experimental chamber, fix the surface of the smoke plate with transparent polyurethane paint, and obtain a cellular image of the surface of the smoke plate caused by the oblique detonation wave.

[0019] As a preferred embodiment of the present invention, the diameter of the projectile inlet hole opened on the experimental chamber is 60 mm, the thickness of the diaphragm arranged at the projectile inlet hole is 15 μm, and the thickness of the diaphragm arranged at the projectile outlet hole is 100 μm.

[0020] As a preferred solution of the present invention, an optical observation window is provided on the experimental cabin, and a laser shadow image acquisition device is provided on the optical observation window to acquire the flow field structure of the oblique detonation wave in the experimental cabin.

[0021] As a preferred solution of the present invention, two speed measuring stations with a gap are arranged in the experimental cabin, one of which is close to the optical observation window; the distance between the two speed measuring stations when the projectile passes is calculated to obtain the flight speed of the projectile;

[0022] The triggering time of the laser shadow image acquisition device is determined according to the flight speed and the distance between the speed measuring station and the optical observation window.

[0023] As a preferred solution of the present invention, a plurality of pressure sensors are arranged in the experimental chamber, and the pressure sensors are used to obtain the initial pressure in the experimental chamber and the pressure change in the experimental chamber during the generation of the oblique detonation wave.

[0024] As a preferred embodiment of the present invention, a statistical method for the cell image of the obtained smoke plate is also included, which specifically includes:

[0025] Select cells at least 50 different positions on the smoke trail plate to count the cell scales along the ballistic direction and perpendicular to the ballistic direction;

[0026] Among them, the cell size along the ballistic direction is the cell length, and the cell size perpendicular to the ballistic direction is the cell width;

[0027] For a rhombus cell, the cell length is the component of the distance between the two vertices along the ballistic direction, and the cell width is the component of the distance between the two vertices perpendicular to the ballistic direction.

[0028] For a polygonal cell, each vertex of the polygonal cell is replaced with the four points farthest along the trajectory and perpendicular to the trajectory, and the length and width of the polygonal cell are the components corresponding to the four points in the direction along the trajectory and in the opposite direction perpendicular to the trajectory.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The present invention provides a measurement system which fills an experimental cabin with combustible gas and detonates a projectile injected at high speed to form an oblique detonation blast wave, and sets a smoke trail plate in the circumferential and axial ranges of the trajectory to obtain an oblique detonation blast wave cell image. The system can adaptively set the smoke trail plate according to the generated oblique detonation blast wave flow field to capture the precise cell morphology and size. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0032] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0033] Figure 2 Schematic diagram of the cell width distribution of oblique detonation

[0034] Figure 3 This is a schematic diagram of the change of cell width with pressure during the experiment of this measurement system for stationary oblique detonation and straw hat-shaped oblique detonation.

[0035] The numbers in the figure represent the following:

[0036] 1-experimental cabin; 2-inlet hole; 3-exit hole; 4-diaphragm; 5-projectile launching device; 6-smoke plate; 7-support device; 8-buffer chamber. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] like Figure 1 As shown, this embodiment provides a stationary oblique detonation wave lattice structure measurement system, comprising:

[0039] An experimental chamber 1, wherein an inlet hole 2 and an outlet hole 3 are respectively arranged at both ends of the experimental chamber 1, and a diaphragm 4 is arranged on the inlet hole 2 and the outlet hole 3 for sealing the experimental chamber 1, and a combustible gas is pre-filled in the experimental chamber 1, wherein the combustible gas is specifically a mixed gas of multi-component combustible gases, and considering the two-stage chemical reaction of multiple component gases in the mixed gas when an oblique detonation wave occurs, the mixed gas mainly adopts 8 components and is mainly aimed at hydrogen-oxygen detonation, namely H2, O2, HO, H2O, H2O2, HO2, O and H;

[0040] The projectile launching device 5 is arranged at one end of the experimental chamber 1, and is used to accelerate the projectile to a target speed and then launch it from the inlet hole 2 into the experimental chamber 1, and the projectile is ejected from the outlet hole 3, and the projectile with the target speed contacts the combustible gas in the experimental chamber 1 and detonates, inducing an oblique detonation wave;

[0041] The smoke plates 6, including a plurality of smoke plates, are arranged in the experimental chamber 1 and distributed in the circumferential and / or axial directions of the trajectory of the projectile entering the experimental chamber 1. The surface of the smoke plates 6 contacts the generated oblique detonation wave and is ablated to form cells.

[0042] The experimental chamber 1 provided in this embodiment is an integral cavity structure, and there is no partition type structure in the cavity that generates the oblique detonation wave, the purpose of which is to allow the generated oblique detonation wave to spread as much as possible in the circumferential range of the trajectory. In addition, it is possible to build an oblique detonation wave that adapts to different shock wave structure flow fields, and measure and adjust the cellular structure it generates.

[0043] Furthermore, it is possible to provide equipment with smoke trail plates at different axial and circumferential distances from the projectile trajectory to fully obtain the cell measurements of the state of the generated oblique wave blast at various stages, thereby reflecting the state of the oblique wave blast.

[0044] Furthermore, the same scene can be used to perform multivariable control of the cells that generate the oblique wave bombardment, and the control parameters include but are not limited to the end structure, speed and angle of the projectile, the combination of the component gases of the combustible gas, the position and shape of the smoke plate, etc.

[0045] In the measurement system involved in this embodiment, in the oblique wave generated by detonating the combustible gas with a high-speed projectile, the enhancement of the compression effect of the projectile will accelerate the chemical reaction rate of the combustion wave. The increase in the compression effect of the projectile under different working conditions will also lead to the establishment of different combustion wave forms.

[0046] For the working condition where the projectile velocity is greater than the CJ detonation velocity, the increase of the projectile velocity or the initial pressure will reduce the length of the induced zone, and the combustion wave induced by the projectile will couple with the shock wave to form a detonation wave as the compression effect increases.

[0047] The order of coupling is related to the compression effect of the projectile. The enhanced compression effect in shock wave induced combustion will cause the combustion wave to couple at the projectile head to form an overdriven detonation wave. If it continues to enhance, it will couple downstream of the projectile to form a stationary oblique detonation wave.

[0048] There is a straw hat type oblique detonation as an intermediate state between the shock wave induced combustion and the stationary oblique detonation conditions. For the condition where the projectile velocity is lower than the CJ velocity, the enhancement of the projectile compression effect will cause the shock wave induced combustion to transform into a detonation wave, but the detonation wave cannot be stationary, forming a detonation wave of projectile detonation.

[0049] The smoke plate 6 in this embodiment is installed in the experimental chamber 1 through the supporting device 7. The supporting device 7 can adjust the angle of the smoke plate 6 relative to the trajectory. The supporting device can specifically be a simple sheet-like or rod-like bracket structure.

[0050] Through the cells of the oblique detonation waves presented on the smoke plate 6, experimental measurement and analysis of the cell structure and cell size of the oblique detonation transverse wave are achieved.

[0051] The measurement of oblique detonation wave cells shows that there are differences in the wave propagation state of stationary oblique detonation when it is close to the critical state and far away from the critical state.

[0052] The higher initial pressure far from the critical state leads to a shorter induction zone and an increased number of shear waves, and the combustion instability leads to the generation / merger of shear waves, resulting in a polygonal cellular structure.

[0053] Near the critical state, the shear waves are regular and few in number, forming regular diamond-shaped cells of larger size.

[0054] The variation law of cell size reflects the change of the propagation state of detonation wave. The cell size of stationary oblique detonation wave decreases with the increase of pressure, while the variation law of straw hat type is the opposite.

[0055] Furthermore, in this embodiment, numerical simulation of the unsteady process of the projectile critical process and the detonation process is carried out to verify the critical theory and analyze the detonation mechanism of the stationary oblique detonation wave.

[0056] The applicability of critical theory is related to the specific flow process and initiation process. The existing critical theory is only applicable to specific wave surface flow process and initiation process.

[0057] The verification of energy limitation theory and dimensionless projectile diameter in existing experimental methods shows its limitations. It is applicable to the detonation process dominated by projectile compression, that is, when the quenching of detonation wave near the projectile is determined by the expansion wave. In this embodiment, the dimensionless projectile diameter d / λ can be proposed separately in different critical theories, which is the ratio of the projectile diameter to the cell width under the critical state.

[0058] For the detonation process dominated by chemical reaction exothermicity, the reason for the quenching of the detonation wave is that the post-wave diffusion effect enhances the chemical reaction exothermicity and cannot support the coupling of combustion and shock wave, so the chemical reaction process needs to be considered.

[0059] A buffer cavity 8 is provided at one end of the experimental chamber 1. The projectile launching port of the projectile launching device 5 is located in the buffer cavity 8, and there is a gap between the buffer cavity 8 and the inlet hole 2. The buffer cavity 8 can specifically be a cylindrical cavity structure, and the cylindrical cavity structure is coaxial with the projectile launching port.

[0060] The inlet hole 2 and the outlet hole 3 are provided with a diaphragm sheet 4 in the initial state.

[0061] The smoke plate 6 comprises an arc-shaped aluminum plate body, and supporting devices 7 are arranged on both sides of the arc-shaped aluminum plate body.

[0062] This embodiment provides a measurement method based on the stationary oblique detonation wave lattice structure measurement system, including the following specific steps:

[0063] Step 100, multiple arc-shaped smoke plates are installed in the test cabin through a supporting device, and the inlet and outlet holes of the projectiles opened on the test cabin are sealed with a diaphragm sheet, and then a mixed gas of hydrogen and oxygen with a mixing ratio of 3:1 or other fuel gas mixtures with a matching ratio are injected into the test cabin;

[0064] Step 200, using a projectile launching device to accelerate the projectile to a speed greater than the CJ detonation speed of the mixed gas, and launching the projectile into the experimental chamber from the inlet hole of the experimental chamber, thereby inducing an oblique detonation wave in the combustible gas in the experimental chamber;

[0065] Step 300, taking out the smoke plate ablated by the oblique detonation wave in the experimental chamber, fixing the surface of the smoke plate with transparent polyurethane paint, and obtaining a cellular image of the surface of the smoke plate caused by the oblique detonation wave.

[0066] The diameter of the projectile inlet hole opened on the experimental chamber shown is 60 mm, the thickness of the diaphragm arranged at the projectile inlet hole is 15 μm, and the thickness of the diaphragm arranged at the projectile outlet hole is 100 μm.

[0067] In this embodiment, an optical observation window may be provided on the experimental chamber, and a laser shadow image acquisition device may be provided on the optical observation window to acquire the flow field structure of the oblique detonation wave in the experimental chamber.

[0068] Two speed measuring stations with a gap are arranged in the experimental cabin, one of which is close to the optical observation window; the flight speed of the projectile is obtained by calculating the distance between the two speed measuring stations when the projectile passes through;

[0069] The triggering time of the laser shadow image acquisition device is determined according to the flight speed and the distance between the speed measuring station and the optical observation window.

[0070] A plurality of pressure sensors are arranged in the experimental cabin, and the pressure sensors are used to obtain the initial pressure in the experimental cabin and the pressure change in the experimental cabin during the generation of the oblique detonation wave. The purpose is to measure the initial pressure of the mixture filled in the cabin and the pressure change after the generation of the oblique wave detonation wave by the pressure sensor, so as to measure the state of the induced combustion wave of the oblique wave detonation wave and the length of the induced zone after the shock wave is generated as the projectile speed increases.

[0071] It also includes a statistical method for the cell grid image of the obtained smoke plate, specifically including:

[0072] Select cells at least 50 different positions on the smoke trail plate to count the cell scales along the ballistic direction and perpendicular to the ballistic direction;

[0073] Among them, the cell size along the ballistic direction is the cell length, and the cell size perpendicular to the ballistic direction is the cell width;

[0074] For a rhombus cell, the cell length is the component of the distance between the two vertices along the ballistic direction, and the cell width is the component of the distance between the two vertices perpendicular to the ballistic direction.

[0075] For the polygonal cell, each vertex of the polygonal cell is replaced with the four points with the farthest distance along the trajectory and perpendicular to the trajectory. The length and width of the polygonal cell are the components corresponding to the four points in the direction along the trajectory and in the opposite direction perpendicular to the trajectory.

[0076] Based on the measurement system in this embodiment, two smoke trail plates at different distances from the trajectory are set in the same experiment, and the cell sizes at different positions of the oblique detonation wave are measured simultaneously.

[0077] The cell width and cell length measured on the smoke trail plate at different positions. The two connected points in the figure correspond to the measurement results at different positions under the same working condition.

[0078] The specific conditions of the oblique wave bombardment cell measured in the measurement experiment based on this measurement system include:

[0079] Figure 2 Specifically, it is a histogram of the cell width distribution of oblique detonation waves under different working conditions, where Figure 2 The left is the cell width distribution of stationary oblique detonation. Figure 2 The right shows the cell width distribution of a straw hat-shaped oblique detonation.

[0080] The cell width of stationary oblique detonation decreases with the increase of pressure, and its distribution range also decreases with the increase of inflation pressure.

[0081] The minimum value of the cell of stationary oblique detonation at different pressures does not change significantly, and its maximum value decreases with the increase of pressure. The cell width is densely distributed near the average value (indicated by the dotted line in the figure), and the relative frequency of the cell width distribution decreases with the deviation from the average value.

[0082] Figure 2 It shows that the distribution of the cell width of the straw-hat type oblique detonation under different pressures is relatively concentrated, and the cell width distribution on both sides of its average value is relatively uniform. The cell width of the straw-hat type oblique detonation does not show an obvious trend of changing with the change of pressure.

[0083] are the cell widths of stationary oblique detonation and straw-hat-type oblique detonation with different initial pressures. The distribution law of the cell width of stationary oblique detonation wave is different from that of straw-hat-type oblique detonation wave.

[0084] The cell width of the stationary oblique detonation wave decreases with the increase of initial pressure. When the pressure increases from 18.0 kPa to 30.0 kPa, the cell width decreases from 7.2 mm to 3.3 mm. In the condition of low pressure, the cell width of the detonation wave is not only large but also has a large standard deviation, indicating that the cell width changes continuously during the propagation of the detonation wave.

[0085] Figure 3 The cell widths of positive detonation waves with the same components and the same inflation pressure are compared in the figure. The cell width of stationary oblique detonation wave is close to that of positive detonation wave under the same pressure, while the cell width of straw hat-shaped oblique detonation wave is much lower than that of positive detonation wave under the same inflation pressure.

[0086] However, at lower pressures, the chemical reaction induction zone is longer, and the positive detonation wave cell is a more regular rhombus. However, the shape of the oblique detonation wave cell under the same inflation pressure is different from that of the positive detonation. The polygonal cell indicates that the propagation process of the oblique detonation shear wave is different from that of the positive detonation wave, and its propagation process is more chaotic.

[0087] The variation law of the cell width of the straw hat-shaped oblique detonation wave measured in the experiment provided by this measurement system is different from that of the stationary oblique detonation wave.

[0088] In the experiment, it was observed that the cell width gradually increased with the increase of pressure. In the experiment, the initial pressure range was 10.3-15.1 kPa, and the cell width increased from 3.0 mm to a maximum of 10.1 mm.

[0089] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. A stationary oblique detonation wave lattice structure measurement system, characterized in that: include: An experimental chamber (1), wherein an inlet hole (2) and an outlet hole (3) are respectively arranged at two ends of the experimental chamber (1), a diaphragm (4) is arranged on the inlet hole (2) and the outlet hole (3) for sealing the experimental chamber (1), and combustible gas is pre-filled into the experimental chamber (1); A projectile launching device (5) is arranged at one end of the experimental chamber (1) and is used to accelerate the projectile to a target speed and then launch it from the inlet hole (2) into the experimental chamber (1), and the projectile is ejected from the outlet hole (3). The projectile with the target speed contacts the combustible gas in the experimental chamber (1) and detonates, thereby inducing an oblique detonation wave. The smoke plate (6) comprises a plurality of smoke plates, which are arranged in the experimental chamber (1) and distributed in the circumferential direction and / or axial direction of the trajectory of the projectile entering the experimental chamber (1); the surface of the smoke plate (6) contacts the generated oblique detonation wave and is ablated to form cells.

2. A stationary oblique detonation wave cellular structure measurement system according to claim 1, characterized in that: The smoke plate (6) is installed in the experimental chamber (1) via a supporting device (7), and the supporting device (7) is capable of adjusting the angle of the smoke plate (6) relative to the trajectory.

3. A stationary oblique detonation wave cellular structure measurement system according to claim 1, characterized in that: A buffer cavity (8) is provided at one end of the experimental chamber (1); a projectile launching port of the projectile launching device (5) is located in the buffer cavity (8) and there is a gap between the projectile launching port and the inlet hole (2); Wherein, the inlet hole (2) and the outlet hole (3) are provided with a diaphragm sheet (4) in the initial state.

4. A stationary oblique detonation wave cellular structure measurement system according to claim 1, characterized in that: The smoke plate (6) comprises an arc-shaped aluminum plate body, and the supporting devices (7) are arranged on both sides of the arc-shaped aluminum plate body.

5. A measurement method based on the stationary oblique detonation wave lattice structure measurement system according to claim 1, characterized in that: Including specific steps: Step 100, multiple arc-shaped smoke plates are installed in the test cabin through a supporting device, and the inlet and outlet holes of the projectiles opened on the test cabin are sealed with a diaphragm sheet, and then a mixed gas of hydrogen and oxygen with a mixing ratio of 3:1 or other fuel gas mixtures with a matching ratio are injected into the test cabin; Step 200, using a projectile launching device to accelerate the projectile to a speed greater than the CJ detonation speed of the mixed gas, and launching the projectile into the experimental chamber from the inlet hole of the experimental chamber, thereby inducing the combustible gas in the experimental chamber to generate an oblique detonation wave; Step 300: Take out the smoke plate ablated by the oblique detonation wave in the experimental chamber, fix the surface of the smoke plate with transparent polyurethane paint, and obtain a cellular image of the surface of the smoke plate caused by the oblique detonation wave.

6. A stationary oblique detonation wave cellular structure measurement system according to claim 5, characterized in that: The diameter of the projectile inlet hole opened on the experimental chamber shown is 60 mm, the thickness of the diaphragm arranged at the projectile inlet hole is 15 μm, and the thickness of the diaphragm arranged at the projectile outlet hole is 100 μm.

7. The method for measuring the cellular structure of a stationary oblique detonation wave according to claim 5, characterized in that: An optical observation window is arranged on the experimental cabin, and a laser shadow image acquisition device is arranged on the optical observation window to acquire the flow field structure of the oblique detonation wave in the experimental cabin.

8. The method for measuring the cellular structure of a stationary oblique detonation wave according to claim 7, characterized in that: Two speed measuring stations with a gap are arranged in the experimental cabin, one of which is close to the optical observation window; the flight speed of the projectile is obtained by calculating the distance between the two speed measuring stations when the projectile passes through; The triggering time of the laser shadow image acquisition device is determined according to the flight speed and the distance between the speed measuring station and the optical observation window.

9. The method for measuring the cellular structure of a stationary oblique detonation wave according to claim 7, characterized in that: A plurality of pressure sensors are arranged in the experimental chamber, and the pressure sensors are used to obtain the initial pressure in the experimental chamber and the pressure change in the experimental chamber during the process of generating the oblique detonation wave.

10. The method for measuring the cellular structure of a stationary oblique detonation wave according to claim 7, characterized in that: It also includes a statistical method for the cell grid image of the obtained smoke plate, specifically including: Select cells at least 50 different positions on the smoke trail plate to count the cell scales along the ballistic direction and perpendicular to the ballistic direction; Among them, the cell size along the ballistic direction is the cell length, and the cell size perpendicular to the ballistic direction is the cell width; For a rhombus cell, the cell length is the component of the distance between the two vertices along the ballistic direction, and the cell width is the component of the distance between the two vertices perpendicular to the ballistic direction. For a polygonal cell, each vertex of the polygonal cell is replaced with the four points farthest along the trajectory and perpendicular to the trajectory, and the length and width of the polygonal cell are the components corresponding to the four points in the direction along the trajectory and in the opposite direction perpendicular to the trajectory.

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