Ignition combustion experiment system based on acoustic levitation

Abstract

The invention discloses an ignition combustion experiment system based on acoustic levitation, and relates to the technical field of combustion experiment equipment, and a levitation device comprises a driving mechanism and a sound field generator; the sound field generator comprises a plurality of transducers, the transducers are distributed on the surface of the same virtual sphere in a three-dimensional symmetrical mode and form a spherical array, and sound waves generated by the transducers are interfered and superposed in a sphere center area of the spherical array to form a three-dimensional standing wave field which is used for enabling an object to be suspended to suspend in the sphere center area of the spherical array; the driving mechanism is electrically connected with each transducer and is used for providing an adjustable electric signal capable of driving each transducer to work; the ignition device comprises a laser igniter; the laser igniter is used for emitting a laser main beam irradiated on the surface of one side of an object to be suspended; the measuring device is used for collecting data of the whole process from ignition starting to complete combustion of the object to be suspended, so that the problems existing in the prior art are solved, and the suspension capacity and stability of the whole device are higher.

Description

Technical Field

[0001] The present invention relates to the technical field of combustion experimental equipment, in particular to an ignition and combustion experimental system based on acoustic suspension. Background Art

[0002] Solid energetic fuels have been widely used in many fields and industries, particularly in the field of fuel propulsion, where they play a vital role. For example, metallic energetic fuels such as aluminum, boron, and magnesium, due to their extremely high mass and volumetric energy densities, have become irreplaceable energetic components in spacecraft solid motor propellants and explosives, serving as a crucial energy source. The primary factor affecting the effectiveness of energetic fuels in their applications is whether their energy is fully released. The prerequisite for and primary pathway for energy release is rapid ignition and complete combustion of the energetic fuel. Therefore, a thorough understanding of the ignition process and combustion characteristics of energetic fuels and their derivatives, such as solid propellants and explosives, is crucial. Currently, the main approach used by researchers both domestically and internationally to investigate ignition and combustion is to place the material under investigation on a glass slide or secure it to a metal support. Laser light is then focused on the material surface by constructing an optical path to achieve ignition and combustion. This approach presents the problem of contact between the burning material and other external materials, resulting in inaccurate experimental results. Introducing non-contact levitation into ignition and combustion experiments could effectively address these issues. Currently, pneumatic, electromagnetic, and optical levitation methods have been applied to ignition and combustion experiments, but they have several drawbacks. For example, electromagnetic levitation requires the suspended sample to be conductive, pneumatic levitation suffers from poor stability, and optical levitation provides a relatively small levitation force, measured in the nanonewton range. Acoustic levitation devices, capable of maintaining long-term levitation and possessing strong levitation capabilities, are a promising option for ignition and combustion experiments. However, the levitation stability of acoustic levitation ignition and combustion devices needs further improvement, and the use of high-power lasers for ignition can affect the stable levitation of small combustion volumes. Summary of the Invention

[0003] The purpose of the present invention is to provide an ignition and combustion experimental system based on acoustic levitation to solve the problems existing in the above-mentioned prior art and to make the suspension ability and stability of the entire device stronger.

[0004] To achieve the above-mentioned object, the present invention provides the following solutions: The present invention provides an ignition and combustion experimental system based on acoustic levitation, comprising an ignition device, a measuring device and a levitation device;

[0005] The levitation device includes a drive mechanism and an acoustic field generator; the acoustic field generator includes a plurality of transducers, each of which is distributed in a three-dimensionally symmetrical manner on the surface of the same virtual sphere to form a spherical array. The acoustic waves generated by each of the transducers interfere and superimpose in the center region of the spherical array to form a three-dimensional standing wave field, which is used to suspend the object to be levitated in the center region of the spherical array; the drive mechanism is electrically connected to each of the transducers to provide an adjustable electrical signal capable of driving each of the transducers to operate;

[0006] The ignition device includes a laser igniter; the laser igniter is used to emit a main laser beam that irradiates a surface of one side of the object to be levitated;

[0007] The measuring device is used to collect data of the entire process from the initial ignition to the complete combustion of the object to be suspended.

[0008] Preferably, the spherical array comprises two array groups that are symmetrical and spaced apart in the vertical direction, each of the array groups comprises a plurality of annular arrays, and each of the annular arrays comprises a plurality of transducers;

[0009] Each of the annular arrays surrounds the outer periphery of the same central axis of the spherical array, the structure of each annular array increases step by step, and each annular array approaches the center area of the spherical array step by step from the inside to the outside along the direction extending from the central axis.

[0010] Preferably, the output ends of the transducers are all directed toward the center area of the spherical array.

[0011] Preferably, the driving mechanism is used to generate two beams of associated electrical signals, and the driving mechanism is provided with two output terminals respectively used to output the two electrical signals;

[0012] The transducers in each annular array are connected in series in sequence, and the annular arrays symmetrical between the two array groups are connected in parallel to form parallel units, and each parallel unit is connected to each output end respectively.

[0013] Preferably, the spherical array is equipped with a mounting shell having a spherical structure, and the spherical array is mounted on the inner wall surface of the mounting shell.

[0014] Preferably, the driving mechanism includes a signal generator and a power amplifier, the power amplifier is electrically connected to the output end of the signal generator, and the output end of the power amplifier is electrically connected to each of the transducers.

[0015] Preferably, the laser igniter is located on one side of the spherical array of the suspension device in the vertical direction, and a first clearance gap for the laser main beam to pass through is provided on either side of the spherical array in the vertical direction.

[0016] Preferably, the spherical array is provided with a second clearance interval along any side in the horizontal direction, and the second clearance interval is used for the measuring device to identify the object to be suspended.

[0017] Preferably, the laser igniter is equipped with a concave reflector, which is located on the side of the spherical array facing away from the laser igniter, and a third clearance gap for the laser main beam to pass through is provided on the side of the spherical array close to the concave reflector in the vertical direction, and the concave reflector is used to reflect the laser main beam passing through the third clearance gap and irradiate it onto the other side surface of the object to be suspended.

[0018] Preferably, the measuring device includes a controller, a camera, a spectrometer and an infrared thermal imager;

[0019] The camera device, the spectrometer and the infrared thermal imager are all arranged at the second gap and are electrically connected to the controller. The controller is used to record data of the entire process from the start of ignition to complete combustion of the object to be suspended.

[0020] Compared with the prior art, the present invention has achieved the following technical effects:

[0021] The present invention sets up a spherical array, and specifically each transducer is divided into multiple groups. Some transducers emit sound waves, and the other part actively emits opposite-phase sound waves rather than passively reflects, forming active interference standing waves. Efficient superposition of sound wave energy is achieved through phase control. Compared with the technical solution of setting reflectors in the prior art, the sound pressure level (SPL) in the center area of the sphere of the present invention can be increased by 20%-30%. Furthermore, the sound wave phases of all transducers are synchronized after precise calculation, so that the sound energy is focused in the center area of the sphere, and the sound intensity density can be increased by 1.5-2 times, which can suspend objects with larger mass. In addition, combined with a drive mechanism to provide an adjustable electrical signal that can drive each transducer to work, the suspension ability and stability of the entire device are enhanced, and it can be applied to ignition and combustion experiments on different objects to be suspended. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is a schematic structural diagram of the entire acoustic levitation-based ignition and combustion experimental system in one embodiment disclosed in the present invention;

[0024] Figure 2A schematic diagram of the parallel connection and wiring of the annular arrays in one embodiment disclosed in the present invention;

[0025] Figure 3 A schematic structural diagram of an array group in an embodiment disclosed in the present invention;

[0026] In the figure, 1-signal generator, 2-power amplifier, 3-controller, 4-infrared thermal imager, 5-high-speed camera, 6-spectrometer, 7-laser igniter, 8-concave mirror, 9-concave spherical shell, 10-array group, 11-connector, 12-through hole, 13-first annular array, 14-second annular array, 15-third annular array, 16-fourth annular array, 17-fifth annular array, 18-sixth annular array. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0028] The purpose of the present invention is to provide an ignition and combustion experimental system based on acoustic levitation to solve the problems existing in the above-mentioned prior art and to make the suspension ability and stability of the entire device stronger.

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] like Figures 1 to 3As shown, the present invention provides an ignition and combustion experimental system based on acoustic levitation, including a levitation device, which includes a driving mechanism and an acoustic field generator; the acoustic field generator includes a plurality of transducers, and the transducers are preferably piezoelectric transducers; the transducers are distributed on the surface of the same virtual sphere in a three-dimensional symmetrical manner to form a spherical array, and the sound waves generated by the transducers interfere and superimpose in the center area of the spherical array to form a three-dimensional standing wave field, which is used for suspending the object to be suspended in the center area of the spherical array; the driving mechanism is electrically connected to the transducers, and is used to provide an adjustable electrical signal that can drive the transducers to work, so as to realize the regulation of the sound field intensity, wherein the adjustable setting of the electrical signal is specifically the regulation of the parameters such as the amplitude, frequency and phase of the electrical signal; the present invention is achieved by setting the spherical array. The invention is a spherical array in which each transducer is divided into multiple groups. Some transducers emit sound waves, while the other part actively emits sound waves of opposite phase rather than passively reflects, forming active interference standing waves. The efficient superposition of sound wave energy is achieved through phase control. Compared with the technical solution of setting a reflector in the prior art, the sound pressure level (SPL) in the center area of the sphere of the invention can be increased by 20%-30%. Furthermore, the sound wave phases of all transducers are synchronized after precise calculation, so that the sound energy is focused in the center area of the sphere, and the sound intensity density can be increased by 1.5-2 times, which can levitate objects with larger mass. In addition, the driving mechanism provides an adjustable electrical signal that can drive each transducer to work, so that the levitation ability and stability of the entire device are stronger, and it can be applied to ignition and combustion experiments on different objects to be suspended.

[0031] In a specific embodiment, the number of transducers in the spherical array is adjustable and arranged according to the vertex positions of a regular polyhedron, which includes a regular dodecahedron, a regular icosahedron, a truncated icosahedron, and the like.

[0032] In another specific embodiment, the spherical array includes two array groups 10 that are symmetrical and spaced apart in the vertical direction. Each array group 10 includes multiple annular arrays, the number of which is adjustable. Each annular array includes multiple transducers. The number of transducers in the same annular array is adjustable, ensuring that the number of transducers is as large as possible without interfering with each other. Each annular array surrounds the outer periphery of the same central axis of the spherical array. The structure of each annular array increases step by step, and each annular array gradually approaches the center area of the spherical array from the inside to the outside along the direction extending from the central axis. That is, among the annular arrays on the same side, the smallest annular array is located near the pole of the virtual sphere, and the remaining annular arrays are arranged in a direction of gradually decreasing dimensionality and gradually approach the equator of the virtual sphere, with their structures gradually increasing. In this embodiment, the annular arrays have a circular ring structure to ensure uniform transducer distribution. Furthermore, the spacing between adjacent annular arrays is the same. In this embodiment, the operating frequency of the annular array is 40kHz, and its adjustable voltage range is 10-100V.

[0033] In this embodiment, each annular array surrounds the outer periphery of the vertically extending central axis of the spherical array.

[0034] In this embodiment, the output ends of the transducers are all directed toward the center area of the spherical array, that is, the sound waves emitted by the output ends of the transducers are diffracted toward the center area of the spherical array, so as to further increase the sound intensity density in the center area of the spherical array, thereby improving the suspension ability and stability of the entire device.

[0035] In a specific embodiment, the drive mechanism is used to generate two related electrical signals, and the drive mechanism is provided with two output terminals for outputting the two electrical signals respectively; each transducer in each annular array is connected in series, and the symmetrical annular arrays between the two array groups 10 are connected in parallel to form parallel units, each of which is connected to each output terminal. By controlling the different phases of the two electrical signals, the phases of each transducer are controlled, making the suspension more stable. In this embodiment, each array group 10 includes three annular arrays. The annular arrays in one array group 10 are divided into a first annular array 13, a second annular array 14, and a third annular array 15 in descending order of structure, and the annular arrays in the other array group 10 are divided into a fourth annular array 16, a fifth annular array 17, and a sixth annular array 18 in descending order of structure. In the vertical direction, the first annular array 13 is symmetrically distributed with the fourth annular array 16, the second annular array 14 is symmetrically distributed with the fifth annular array 17, and the third annular array 15 is symmetrically distributed with the sixth annular array 18. Furthermore, first, third, fourth, and sixth annular arrays 13, 15, 16, and 18 are arranged in parallel and electrically connected to one output terminal of the drive mechanism. Second and fifth annular arrays 14, 17 are arranged in parallel and electrically connected to another output terminal of the drive mechanism. The drive mechanism outputs two sinusoidal signals with adjustable phase, amplitude, and frequency through its two output terminals, distributing and controlling the operation of the different annular arrays.

[0036] In one specific embodiment, the spherical array is equipped with a spherical mounting housing. The spherical array is mounted on the inner wall of the mounting housing. The mounting housing is used to connect the transducers in the spherical array, preferably by gluing the transducers to the inner wall of the mounting housing. The mounting housing is also equipped with a support frame, which is used to mount the mounting housing to the support frame to complete the positioning of the mounting housing and the transducers. The main body of the mounting housing is approximately 45 mm away from the center of the sphere. After the transducers are installed, the output end of each transducer is approximately 40 mm away from the center of the sphere.

[0037] In this embodiment, the mounting housing is a complete spherical shell structure with a mounting window, through which each transducer can be mounted on the inner wall of the mounting housing. Each array group 10 is centered on the equatorial region of the mounting housing and is symmetrically distributed on both sides of the equatorial region.

[0038] In this embodiment, the mounting shell includes two concave spherical shells 9, which are symmetrically distributed along the vertical direction. Each array group 10 is respectively mounted on the inner wall surface of each concave spherical shell 9, and both concave spherical shells 9 are mounted on a support frame.

[0039] In this embodiment, other installation methods may also be used, such as optimizing the structure of the support frame and directly connecting the support frame to each transducer so that each circulator forms a spherical array.

[0040] In a specific embodiment, the driving mechanism includes a signal generator 1 and a power amplifier 2. The power amplifier 2 is electrically connected to the output end of the signal generator 1, and the output end of the power amplifier 2 is electrically connected to each transducer. The power amplifier 2 receives the electrical signal generated by the signal generator 1, amplifies the electrical signal and drives each transducer to work. The combination of the signal generator 1 and the power amplifier 2 is used to drive the transducer. The electrical signal is adjusted by the signal generator 1 so that the parameters of the electrical signal reach the most suitable condition for driving the transducer, thereby making the suspension ability stronger.

[0041] In this embodiment, the output end of the power amplifier 2 is provided with two connectors 11, which are electrically connected to corresponding annular arrays. In conjunction with the signal generator 1, the two connectors 11 output two electrical signals for connection to different annular arrays. Specifically, the signal generator 1 is configured to output two sinusoidal signals with adjustable phase, amplitude, and frequency. The power amplifier 2 receives the electrical signals generated by the signal generator 1, amplifies the signals, and then drives each transducer. By adjusting the amplitude and frequency of the sinusoidal signals, the electrical signals are optimized to drive each transducer, thereby maximizing levitation capability. By adjusting the phase, the transducers in different annular arrays have different phases, and the phase difference is continuously adjusted to achieve more stable levitation.

[0042] Furthermore, it also includes an ignition device and a measuring device; the ignition device includes a laser igniter 7, which is used to emit a laser main beam that irradiates the surface of one side of the object to be suspended. It should be noted that the laser igniter 7 can emit an indicator light coaxial with the laser main beam, and the indicator light uses a visible laser beam, such as red light and green light, to mark the target point before ignition, that is, to mark the object to be suspended and ensure that the invisible laser main beam is accurately focused; the laser igniter 7 is located on one side of the spherical array of the suspension device in the vertical direction, and a first clearance interval for the laser main beam to pass through is provided on any side of the spherical array in the vertical direction, so that after the laser igniter 7 is turned on, the laser main beam passes through the first clearance interval and can irradiate the object to be suspended. On one side surface of the suspended object, for the suspension device, the acoustic radiation force in the vertical direction is strong and the acoustic radiation force in the horizontal direction is weak. Therefore, the main laser beam is irradiated from the vertical direction to eliminate the influence of the main laser beam irradiated from the side on the stable suspension of the object to be suspended; the measuring device is used to collect data of the entire process from the beginning of ignition to complete combustion of the object to be suspended. The spherical array is provided with a second gap on any side along the horizontal direction. The second gap is used for the measuring device to identify the object to be suspended, so that during the process of igniting the object to be suspended by the laser igniter 7 and after the object to be suspended is burned, the measuring device completes the data collection of the entire process from the beginning of ignition to complete combustion of the object to be suspended through the second gap.

[0043] In this embodiment, the spherical array includes two array groups 10 that are symmetrically spaced apart in the vertical direction. Each array group 10 includes multiple annular arrays, each of which surrounds the outer periphery of the vertically extending central axis of the spherical array. The structure of each annular array is progressively increased, and each annular array gradually approaches the center region of the spherical array from the inside out along the direction extending from the central axis. In combination with the laser igniter 7 being located vertically on one side of the spherical array of the levitation device, and a first clearance gap for the laser main beam to pass through is provided on either side of the spherical array in the vertical direction, the present invention ensures that the irradiation direction of the laser main beam is vertical, so that the larger acoustic radiation force in the vertical direction offsets the optical pressure of the laser main beam, eliminating the influence of the laser main beam on the stable levitation of the object to be levitated.

[0044] In this embodiment, the laser igniter 7 and the first clearance gap can both be set on the outside of the top end of the spherical array, or can both be set on the outside of the bottom end of the spherical array, so that after the laser igniter 7 emits the laser main beam, the laser main beam passes through the first clearance gap and can be irradiated on one side surface of the object to be suspended.

[0045] In this embodiment, the first and second clearance intervals may be intervals between corresponding transducers. The first clearance interval allows the main laser beam to pass through, and the second clearance interval is used to avoid obstruction of the measurement device when collecting data.

[0046] Furthermore, in an embodiment in which the transducer is installed using a mounting shell and the mounting shell is a complete spherical shell structure, the first clearance interval is a through hole 12 opened at the center position of the top or bottom of the mounting shell, and the diameter of the through hole 12 is preferably about 5 mm. The mounting shell is provided with an observation window on either side in the horizontal direction to serve as a second clearance interval. In an embodiment in which the mounting shell includes two concave spherical shells 9 symmetrically arranged in the vertical direction, the first clearance interval is a through hole 12 opened at the center position of the top of the upper concave spherical shell 9, or a through hole 12 opened at the center position of the bottom end of the lower concave spherical shell 9, and the diameter of the through hole 12 is preferably about 5 mm. The two concave spherical shells 9 are arranged at intervals, and the interval between the two concave spherical shells 9 serves as the second clearance interval.

[0047] In a specific embodiment, the laser igniter 7 is equipped with a concave reflector 8, which is located on the side of the spherical array away from the laser igniter 7, and a third clearance gap for the laser main beam to pass through is opened on the side of the spherical array close to the concave reflector 8 in the vertical direction. The concave reflector 8 is used to reflect the laser main beam passing through the third clearance gap and irradiate it onto the other side surface of the object to be suspended, so as to further offset the light pressure of the laser main beam and eliminate the influence of the laser main beam on the stable suspension of the object to be suspended.

[0048] In this embodiment, the third gap may be the gap between corresponding transducers.

[0049] In this embodiment, in an embodiment in which the transducer is mounted using a mounting shell and the mounting shell is a complete spherical shell structure, or in an embodiment in which the mounting shell includes two concave spherical shells 9 symmetrically arranged in the vertical direction, the third clearance interval is a through hole 12 opened on the opposite side of the first clearance interval and located at the center of the mounting shell. Preferably, the diameter of the through hole 12 is about 5 mm.

[0050] In a specific embodiment, the measuring device includes a controller 3, a camera, a spectrometer 6, and an infrared thermal imager 4. The camera, spectrometer 6, and infrared thermal imager 4 are all located at the second gap and are electrically connected to the controller 3. The controller 3 is used to record data from the entire process of the object to be suspended, from the initial ignition to complete combustion. The camera is preferably a high-speed camera 5, etc. Preferably, the camera, spectrometer 6, infrared thermal imager 4, and laser igniter 7 are uniformly controlled by the controller 3 and triggered synchronously to ensure accurate measurement. The high-speed camera 5 is used to record the entire process of the object to be suspended, from ignition to complete combustion, providing data support for subsequent analysis. The infrared thermal imager 4 receives infrared radiation energy during the combustion process and feeds it back to the photosensitive element, thereby obtaining an infrared thermal image. The spectrometer 6 observes, analyzes, and processes the structure and composition of the burning particles.

[0051] Furthermore, an experimental method for an ignition and combustion experimental system based on acoustic levitation is provided, comprising the following steps:

[0052] S1. placing the object to be suspended in a spherical array so that the object to be suspended is located at the center area of the spherical array;

[0053] S2. The spherical array is controlled by a driving mechanism, which observes the levitation of the object to be levitated, adjusts the electrical signal output by the driving mechanism, and ensures stable levitation of the object to be levitated. The driving mechanism includes a signal generator 1 and a power amplifier 2 connected to each other. The transducer is controlled by the signal generator 1 and is used to adjust parameters such as the amplitude and phase of the electrical signal.

[0054] S3. After stable levitation is achieved, the main laser beam of the laser igniter 7 is turned on, and the main laser beam is irradiated on one side of the object to be levitated. The laser igniter 7 is equipped with a concave reflector 8, and the laser igniter 7 and the concave reflector 8 are located on both sides of the spherical array in the vertical direction. The spherical array is provided with a first and a third gap corresponding to the laser igniter 7 and the concave reflector 8, respectively. After the object to be levitated is stably levitated, the position of the concave reflector 8 is adjusted, and the main laser beam of the laser igniter 7 is turned on. The main laser beam passes through the first gap and irradiates one side of the object to be levitated. The main laser beam not blocked by the object to be levitated is reflected by the concave reflector 8 and passes through the third gap, and then irradiates the other side of the object to be levitated.

[0055] S4, turning on the laser igniter 7 and adjusting the output power of the laser igniter 7 to perform laser ignition;

[0056] S5. The measuring device collects data on the entire process of the object to be suspended from the start of ignition to complete combustion; wherein the camera, spectrometer 6, infrared thermal imager 4, and laser igniter 7 are uniformly controlled by the controller 3 and triggered synchronously; and the controller 3 controls the turning on of the laser igniter 7 and controls the ignition power to perform laser ignition;

[0057] S6. After the experiment is completed, turn off the laser igniter 7 and the driving mechanism.

[0058] In this embodiment, the object to be suspended is placed in front of the spherical array, and the circuits are connected first to output an electrical signal to the transducer through the signal generator 1 and the power amplifier 2, so that the transducer is turned on in advance, and then the object to be suspended is placed in the center area of the spherical array.

[0059] Adaptive changes based on actual needs are all within the scope of protection of the present invention.

[0060] It should be noted that it will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and it is intended that all variations within the meaning and range of equivalents of the claims be encompassed within the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0061] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. An ignition and combustion experimental system based on acoustic levitation, characterized in that: Includes ignition device, measuring device and suspension device; The levitation device includes a drive mechanism and an acoustic field generator; the acoustic field generator includes a plurality of transducers, each of which is distributed in a three-dimensionally symmetrical manner on the surface of the same virtual sphere to form a spherical array. The acoustic waves generated by each of the transducers interfere and superimpose in the center region of the spherical array to form a three-dimensional standing wave field, which is used to suspend the object to be levitated in the center region of the spherical array; the drive mechanism is electrically connected to each of the transducers to provide an adjustable electrical signal capable of driving each of the transducers to operate; The ignition device includes a laser igniter; the laser igniter is used to emit a main laser beam that irradiates a surface of one side of the object to be levitated; The measuring device is used to collect data of the entire process from the initial ignition to the complete combustion of the object to be suspended.

2. The ignition and combustion experimental system based on acoustic levitation according to claim 1 is characterized in that: The spherical array includes two array groups that are symmetrical and spaced apart in the vertical direction, each of the array groups includes a plurality of annular arrays, and each of the annular arrays includes a plurality of transducers; Each of the annular arrays surrounds the outer periphery of the same central axis of the spherical array, the structure of each annular array increases step by step, and each annular array approaches the center area of the spherical array step by step from the inside to the outside along the direction extending from the central axis.

3. The ignition and combustion experimental system based on acoustic levitation according to claim 2 is characterized in that: The output ends of the transducers are all oriented toward the center area of the spherical array.

4. The ignition and combustion experimental system based on acoustic levitation according to claim 2 or 3, characterized in that: The driving mechanism is used to generate two beams of related electrical signals, and the driving mechanism is provided with two output terminals for outputting the two electrical signals respectively; The transducers in each annular array are connected in series in sequence, and the annular arrays symmetrical between the two array groups are connected in parallel to form parallel units, and each parallel unit is connected to each output end respectively.

5. The ignition and combustion experimental system based on acoustic levitation according to claim 1 is characterized in that: The spherical array is equipped with a mounting shell having a spherical structure, and the spherical array is mounted on the inner wall surface of the mounting shell.

6. The ignition and combustion experimental system based on acoustic levitation according to claim 1 is characterized in that: The driving mechanism includes a signal generator and a power amplifier. The power amplifier is electrically connected to the output end of the signal generator, and the output end of the power amplifier is electrically connected to each of the transducers.

7. The ignition and combustion experimental system based on acoustic levitation according to claim 1 is characterized in that: The laser igniter is located on one side of the spherical array of the suspension device along the vertical direction, and a first clearance gap for the laser main beam to pass through is provided on any side of the spherical array along the vertical direction.

8. The ignition and combustion experimental system based on acoustic levitation according to claim 7 is characterized in that: The spherical array is provided with a second clearance interval on any side along the horizontal direction, and the second clearance interval is used for the measuring device to identify the object to be suspended.

9. The ignition and combustion experimental system based on acoustic levitation according to claim 8, characterized in that: The laser igniter is equipped with a concave reflector, which is located on the side of the spherical array facing away from the laser igniter, and a third clearance gap for the laser main beam to pass through is provided on the side of the spherical array close to the concave reflector in the vertical direction. The concave reflector is used to reflect the laser main beam passing through the third clearance gap and irradiate it onto the other side surface of the object to be suspended.

10. The ignition and combustion experimental system based on acoustic levitation according to claim 9, characterized in that: The measuring device includes a controller, a camera, a spectrometer and an infrared thermal imager; The camera device, the spectrometer and the infrared thermal imager are all arranged at the second gap and are electrically connected to the controller. The controller is used to record data of the entire process from the start of ignition to complete combustion of the object to be suspended.

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