A material combustion diagnostic system

Abstract

The application discloses a material combustion diagnosis system, introduces a rectifier, changes the current phase, reduces the suspension material shaking, realizes stable suspension; including asynchronous phase controller, rectifier, adaptive adjustment ultrasonic array, laser, high-speed camera and computer. The asynchronous phase controller contains adjustable power supply, controller and signal generation module; the adaptive adjustment ultrasonic array is a double-sided ultrasonic array, and a driving mechanism is arranged; the phase and distance of the adaptive adjustment ultrasonic array are adjusted, a specific sound field is generated, and materials are suspended; the shaking of the suspended material is reduced by adjusting the rectifier, and after the material is stably suspended, the material is irradiated by using the laser to carry out combustion diagnosis. The system prevents the direct contact between experimental materials and experimental devices, improves the precision of combustion diagnosis; array suspension and the movement of the suspended object in the sound field can be realized at the same time, the application scene of the acoustic suspension technology is expanded, the device structure is simple, easy to realize and beneficial to popularization.

Description

Technical Field

[0001] This invention belongs to the field of acoustic levitation and combustion diagnostic technology, and particularly relates to a material combustion diagnostic system. Background Technology

[0002] The combustion process and efficiency of propellants directly affect the performance of rocket engines. Obtaining combustion characteristics through propellant combustion diagnosis and conducting targeted research is an important part of solid rocket engine research. Currently, researchers at home and abroad have carried out many studies in this field. In terms of experimental research, there are currently several experimental methods: (1) Place the material to be diagnosed on a glass slide, and focus the laser emitted by the laser on the surface of the material by building an optical path to achieve ignition and combustion of the material; (2) Use experimental devices such as flat flame burners to bring the material to be diagnosed into the combustion chamber through gas, and build an additional gas path to introduce combustible gas into the combustion chamber to achieve ignition and combustion of the material to be diagnosed; (3) Fix the material to be diagnosed on a metal support, and irradiate the surface of the material by emitting laser light from a laser to achieve ignition and combustion of the material. Of the three testing methods mentioned above, the first and third methods both involve contact between the material to be diagnosed and other external materials, which can significantly interfere with the combustion diagnosis results during laser ignition. While the second method avoids contact with external materials, the airflow into the combustion chamber is difficult to control precisely, and the residual combustion products can clog the ventilation pipes, damaging the testing equipment. How to eliminate interference from other factors to obtain accurate diagnostic results during propellant combustion diagnosis has been a persistent challenge for researchers both domestically and internationally.

[0003] To address the aforementioned issues, a levitation system is introduced into solid propellant combustion diagnostics, aiming to minimize interference from components other than the material being diagnosed. Compared to other levitation methods, acoustic levitation offers advantages such as simple structure, low application cost, and no special requirements on the physical properties of the suspended material or the external environment. It also boasts excellent levitation capabilities and flexible controllability. Acoustic levitation is currently widely used in biomedical engineering, precision instrument manufacturing, and materials smelting. For example, a patent titled "A Testing Device and Method for the Suspension Force of an Ultrasonic Levitator" applies acoustic levitation to testing suspension force, while another patent, "A Visual Device for Non-Contact Vibration-Induced Spherical Droplet Breakage," applies acoustic levitation to droplet dynamics, providing a favorable environment for subsequent research. This application aims to make combustion diagnostic results more accurate and provide insights into the study of material physicochemical reactions and combustion mechanisms. Simultaneously, the adaptive adjustment of the acoustic field generated by the ultrasonic array can cause significant vibration in the suspended material. To address this issue, a rectifier is introduced into the circuit to change the phase of the current, reducing vibration in the suspended material and improving the stability of the acoustic field. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing combustion diagnostic methods, such as the need to improve diagnostic accuracy and the significant vibration caused by the sound field generated by the adjustment array on suspended materials. This invention proposes a material combustion diagnostic system that introduces a rectifier into the circuit to change the phase of the current, thereby reducing the vibration of suspended materials and improving the stability of the sound field.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] The material combustion diagnostic system includes an asynchronous phase controller, a rectifier, an adaptive adjustment ultrasonic array, a laser, a high-speed camera, and a computer.

[0007] The rectifier is used to change the current phase, reduce the vibration of the suspended material, and achieve stable suspension;

[0008] The asynchronous phase controller includes an adjustable power supply, a controller, and a processor;

[0009] The adjustable power supply powers the diagnostic system, ensuring its smooth operation; the controller receives phase information and transmits it to the processor; the processor, the control unit, and the delayed signal transmission unit process the received phase information and transmit it to the ultrasonic transducer probe of the adaptively adjustable ultrasonic array.

[0010] The rectifier is used to adjust the current phase and reduce the vibration of the suspended material;

[0011] The adjustable power supply includes a DC power supply and a power adapter; the controller includes a microcontroller and an amplifier circuit; the processor includes a circuit control unit and a delayed signal transmission unit; the rectifier includes an electrical signal phase unit and a conducting thyristor; the adaptive adjustable ultrasonic array includes an ultrasonic transducer probe and a drive mechanism.

[0012] The DC power supply is connected to the power adapter; the microcontroller is connected to the amplifier circuit; the circuit control unit is connected to the delayed signal transmission unit; the electrical signal phase unit is connected to the conducting thyristor; the ultrasonic transducer probe is connected to the drive mechanism; the power adapter is connected to the drive mechanism; the delayed signal transmission unit is connected to the ultrasonic transducer probe; the conducting thyristor is connected to the ultrasonic transducer probe; and the amplifier circuit is connected to the circuit control unit.

[0013] The adaptive adjustable ultrasonic array consists of 18 to 120 ultrasonic transducer probes.

[0014] When the adaptive ultrasonic array is specifically implemented, it works best with 72 ultrasonic transducer probes.

[0015] The frequency of the ultrasonic transducer probe is 20-40kHz, and the adjustable voltage range is 10V-50V.

[0016] The adaptive ultrasonic array is a double-sided ultrasonic array with a drive mechanism. By adaptively adjusting the phase and distance of the ultrasonic array, a specific sound field is generated to suspend the material. The vibration of the suspended material is reduced by adjusting the rectifier. After the material is stably suspended, a laser is used to irradiate the material for combustion diagnosis.

[0017] The adaptive adjustable ultrasonic array generates a sound field through the operation of several ultrasonic transducer probes, thereby suspending the material being diagnosed.

[0018] The drive mechanism is used to adjust the distance between the adaptive ultrasonic arrays, so that the suspended material can be stabilized in the sound field generated by the ultrasonic arrays, laying the foundation for subsequent work.

[0019] The laser is used to generate external excitation on the material after it is stably suspended in the sound field, and to cause the material to burn; the high-speed camera is used to record the entire process of the material from ignition to complete combustion, providing data support for subsequent analysis; the computer is used to process the data captured by the high-speed camera.

[0020] The diagnostic method of the material combustion diagnostic system includes the following steps:

[0021] S1. After connecting the combustion diagnostic system circuit, turn on the power supply and adjust the power supply voltage to make the system work normally.

[0022] S2, The controller transmits the phase information to the processor;

[0023] S3. The control unit and the delayed signal transmission unit in the processor transmit the phase information to the ultrasonic transducer probe of the adaptively adjusting ultrasonic array.

[0024] S4. Start the rectifier to adjust the current phase and generate a more stable sound field;

[0025] S5. Start the adaptive ultrasonic array, which works through several ultrasonic transducer probes to form a sound field between the adaptive ultrasonic arrays. The spacing between the arrays is adjusted by the drive mechanism to create a stable sound field.

[0026] S6. After the sound field stabilizes, place the suspended material into the sound field;

[0027] S7. After the material is stably suspended, turn on the laser and apply external excitation to the suspended material until the material can burn.

[0028] S8. Use a high-speed camera to record the material suspension and the entire process from laser ignition to complete combustion of the material;

[0029] S9. Use a computer to process and analyze the obtained data.

[0030] The different material combustion diagnostic system includes: an asynchronous phase controller, a rectifier, an adaptive adjustment ultrasonic array, a laser, a high-speed camera, and a computer;

[0031] The asynchronous phase controller includes an adjustable power supply module, a controller, and a processor;

[0032] The asynchronous phase controller is connected to the rectifier, the rectifier is connected to the adaptive adjustment ultrasonic array, the adaptive adjustment ultrasonic array is connected to the high-speed camera, the laser is connected to the computer, and the high-speed camera is connected to the computer.

[0033] The adjustable power supply module includes a DC power supply unit and a power adapter unit; the controller includes a microcontroller and an amplifier circuit; the processor includes a circuit control unit and a delayed signal transmission unit.

[0034] The rectifier includes a phase adjustment unit for the electrical signal and a conducting thyristor;

[0035] An adaptive adjustable ultrasonic array, comprising an ultrasonic transducer probe and a drive mechanism; the drive mechanism comprises a control unit, a circuit connection unit, and a distance adjustment unit;

[0036] The adjustable power module supplies power to the system. The controller receives the electrical signal transmitted by the adjustable power module, processes it through the microcontroller, and then transmits it to the amplifier circuit to amplify the electrical signal appropriately. The amplified electrical signal is then transmitted to the processor. The processor's control unit and delayed signal transmission unit transmit the amplified electrical signal to the ultrasonic transducer probe of the adaptively adjustable ultrasonic array. After receiving the electrical signal, the ultrasonic transducer probe works to generate sound waves. Several probe units work together to generate a sound field to achieve material levitation. The phase of the electrical signal is processed by adjusting the electrical signal phase unit and the conducting thyristor to reduce material jitter.

[0037] The drive mechanism is connected to the adjustable power module, and the distance between the ultrasonic arrays is adjusted adaptively through the control unit and the distance adjustment unit. After the material achieves stable suspension, the laser and high-speed camera are turned on to perform combustion diagnosis on the material.

[0038] Beneficial effects

[0039] The combustion diagnostic system for different materials proposed in this invention has the following advantages compared with existing combustion diagnostic systems:

[0040] 1. Compared with other combustion diagnostic systems, the combustion diagnostic system overcomes the problem of contact between experimental materials and external devices, improves the accuracy of combustion diagnosis, and reduces the interference of the external environment on combustion diagnosis;

[0041] 2. The combustion diagnostic system provides more accurate combustion diagnostics for propellant materials and reduces the vibration of the material being diagnosed in the acoustic field, achieving more stable suspension;

[0042] 3. The combustion diagnostic system can simultaneously realize array-type levitation and the movement of the levitation object in the sound field, expanding the application scenarios of the acoustic levitation system. The device has a simple structure, is easy to implement, and is conducive to widespread use. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the composition of a material combustion diagnostic system according to the present invention;

[0044] Figure 2 This is a flowchart of a material combustion diagnostic system according to the present invention;

[0045] Figure 3 This invention relates to an adaptively adjustable ultrasonic array in the initial state and adjustment process of a material combustion diagnostic system. Detailed Implementation

[0046] The following description, in conjunction with the accompanying drawings and specific embodiments, further illustrates a combustion diagnostic system for different materials according to the present invention.

[0047] Example 1

[0048] A material combustion diagnostic system is mainly applied in environments with normal temperature and pressure, no wind, and dry conditions. The suspended materials mainly include solid propellants, liquid propellants, and metal particles. The specific implementation process of this material combustion diagnostic system is described in detail below with reference to the invention description and accompanying drawings. To study the combustion process and reaction mechanism of propellants, combustion diagnostics are necessary. Traditional combustion diagnostic methods mainly include several diagnostic systems: one involves placing the material to be diagnosed on a glass slide, which is then placed on a support device and together in a combustion chamber, using laser ignition to diagnose the combustion of the material, as in the article "The Influence of Pressure on the Concentrated Ignition Combustion Characteristics of Nano-Aluminum Powder / RDX Mixture"; another involves using a clamping device to fix the material to be diagnosed on a metal support, and then using laser ignition to diagnose the combustion of the material, as in the paper "Study on the Combustion Characteristics of Single Droplets and Metallic Aluminum Particles". The aforementioned combustion diagnostic systems all have drawbacks. The material to be diagnosed is supported by other devices during the experiment, and during laser ignition, the laser inevitably shines on the support device, affecting the combustion diagnostic results and even leading to erroneous results. Furthermore, the material to be diagnosed is confined to a fixed position by the support device, failing to accurately reproduce the propellant's movement during actual operation. In the material combustion diagnostic system proposed in this application, the material to be diagnosed is in the air and does not contact the support device, effectively eliminating the interference of the support device on the combustion diagnostic results. Simultaneously, the material to be diagnosed can move within the sound field; by introducing a rectifier, the vibration of the material in the sound field is reduced, accurately reproducing the propellant's movement during actual operation, resulting in more accurate combustion diagnostic results. Moreover, traditional combustion diagnostic systems require additional design and adjustment of the support device to obtain combustion diagnostic results. The material combustion diagnostic system disclosed in this invention eliminates the need for designing and adjusting the support device; only the array needs to be adjusted to obtain more accurate combustion diagnostic results. The system structure is simple, easy to implement, and conducive to widespread application.

[0049] like Figure 1As shown, the system includes an asynchronous phase controller, an adjustable power supply, a controller and processor, a rectifier, an adaptive ultrasonic array, a laser, a high-speed camera, and a computer. After connecting the system circuit, the power supply is turned on, and the system operates normally by adjusting the power supply voltage. The microcontroller in the controller uses an Arduino chip as the control core, and the amplification circuit uses an L298N chip with a rated operating current of 2A and a maximum operating voltage of 50V. It transmits the phase information in the current signal to the processor. Based on the received information, the processor, control unit, and delayed signal transmission unit adjust the electrical signal to a suitable electrical signal for the adaptive ultrasonic array. The rectifier is started. When the phase angle of the current is equal to the firing angle of the thyristor, the current can flow smoothly. When the phase angle of the current is different from the firing angle, the rectifier adjusts the phase angle to be the same as the firing angle. This method adjusts the current and thus regulates the sound field formed by the adaptive ultrasonic array. The adaptive ultrasonic array is started, and the ultrasonic transducer probes work to form a sound field between the ultrasonic arrays. The number of probes ranges from 18 to 120; in this invention, 72 probes are used, resulting in the best levitation effect. The drive mechanism is controlled by an adjustable power module. When levying different materials, the drive mechanism adaptively adjusts the distance of the ultrasonic array according to different electrical signals emitted by the power supply, enabling the material to be stably levied in the sound field. After the sound field stabilizes, the material to be levied is placed in the sound field. Once the material is stably levied, the laser is turned on. The laser power is precisely adjustable within the range of 0-6W, capable of continuous light output at 2W adjustable speed, with a stability of <1%, a beam waist diameter ≤2mm, a divergence angle ≤1.5, a spot mode of TEM00, and selectable working modes of CW, TTL, and Analog. The preheating time is less than 10s, and the modulation frequency is 30kHz. External excitation is applied to the material to be levied until the material can burn. A high-speed camera, specifically a PHANTOM, is used. The VEO710 has a maximum shooting frame rate of 1,000,000 frames per second, a memory capacity of 72GB, a minimum exposure time of 1μs, and a minimum time interval between two exposures of 395ns. It records the entire process of material suspension and the complete combustion of the material from laser ignition. The obtained data is then processed and analyzed using a computer.

[0050] like Figure 2As shown, the adjustable power supply module supplies power to the system. The controller receives the electrical signal from the adjustable power supply module, processes it through a microcontroller, and then transmits it to the amplification circuit for appropriate amplification. The amplified electrical signal is then transmitted to the processor. The control unit and the delay signal transmission unit in the processor perform current phase delay processing on the amplified electrical signal, causing a delay in the signal received by the ultrasonic transducer probes at both ends of the adaptive ultrasonic array. After processing, the electrical signal is transmitted to the ultrasonic transducer probes of the adaptive ultrasonic array. The ultrasonic transducer probes generate sound waves after receiving the electrical signal. Several probe units work together to generate a sound field to achieve material levitation. The phase of the electrical signal is processed by the electrical signal phase unit and the conducting thyristor to reduce material jitter. The drive mechanism is connected to the adjustable power supply module, and the distance between the adaptive ultrasonic arrays is adjusted through the control unit and the distance adjustment unit.

[0051] like Figure 3 As shown, the adaptive ultrasonic array consists of 18 to 120 ultrasonic transducer probes. The levitation effect is best when there are 72 ultrasonic transducer probes, providing the greatest acoustic buoyancy compared to other arrays. The ultrasonic transducer probes have a center frequency of 20-40kHz, an operating temperature of -10-70℃, a minimum output sound pressure level of 110dB, and a capacitance of 2400pF. They have a symmetrical structure, and during system operation, the material is stably suspended in the sound field by adjusting the distance between the two arrays.

[0052] The above description is only a partial optional implementation method of this application. It should be noted that for those skilled in the art, other similar implementation methods based on the technical concept of this application without departing from the technical concept of this application also fall within the protection scope of the embodiments of this application.

Claims

1. A material combustion diagnostic system, wherein the material to be diagnosed is in the air and does not contact the support device, effectively eliminating the interference of the support device on the combustion diagnostic results; simultaneously, the material to be diagnosed can move in the sound field, and by introducing a rectifier, the vibration of the material to be diagnosed in the sound field is reduced, restoring the motion state of the propellant in actual operation, resulting in more accurate combustion diagnostic results; overcoming the need for additional design and adjustment of the support device in traditional combustion diagnostic systems to obtain combustion diagnostic results, characterized in that… No design or adjustment of the support device is required; only the array needs to be adjusted, including the asynchronous phase controller, rectifier, adaptive ultrasonic array, laser, high-speed camera, and computer. The asynchronous phase controller is connected to the rectifier, the rectifier is connected to the adaptive adjustment ultrasonic array, the adaptive adjustment ultrasonic array is connected to the high-speed camera, the laser is connected to the computer, and the high-speed camera is connected to the computer. The rectifier is used to change the current phase, reduce the vibration of the suspended material, and achieve stable suspension; The suspended material comprises solid propellant, liquid propellant, and metal particles; The asynchronous phase controller includes an adjustable power supply, a controller, and a processor; The adjustable power supply includes a DC power supply and a power adapter; the controller includes a microcontroller and an amplifier circuit; the processor includes a circuit control unit and a delayed signal transmission unit; the rectifier includes an electrical signal phase unit and a conducting thyristor; the adaptive adjustable ultrasonic array includes an ultrasonic transducer probe and a drive mechanism. The drive mechanism includes a control unit, a circuit connection unit, and a distance adjustment unit; The adjustable power supply provides power to the diagnostic system, ensuring its smooth operation; the controller receives phase information and transmits it to the processor; based on the received information, the processor, circuit control unit, and delayed signal transmission unit process the transmitted phase information and transmit it to the ultrasonic transducer probe of the adaptively adjustable ultrasonic array. The rectifier is used to adjust the current phase and reduce the vibration of the suspended material. When the phase angle of the current is equal to the firing angle of the thyristor, the current can flow smoothly. When the phase angle of the current is different from the firing angle, the rectifier adjusts the phase angle to be the same as the firing angle. In this way, the current is adjusted and the sound field formed by the adaptive ultrasonic array is adjusted. The DC power supply is connected to the power adapter; the microcontroller is connected to the amplifier circuit; the circuit control unit is connected to the delayed signal transmission unit; the electrical signal phase unit is connected to the conducting thyristor; the ultrasonic transducer probe is connected to the drive mechanism; the power adapter is connected to the drive mechanism; the delayed signal transmission unit is connected to the ultrasonic transducer probe; the conducting thyristor is connected to the ultrasonic transducer probe; the amplifier circuit is connected to the circuit control unit. The controller receives the electrical signal from the adjustable power module, processes it through the microcontroller, and then transmits it to the amplification circuit for appropriate amplification. The amplified electrical signal is then transmitted to the processor. The circuit control unit and the delay signal transmission unit in the processor perform current phase delay processing on the amplified electrical signal, causing a delay in the signal received by the ultrasonic transducer probes at both ends of the adaptive ultrasonic array. After processing, the electrical signal is transmitted to the ultrasonic transducer probes of the adaptive ultrasonic array. After receiving the electrical signal, the ultrasonic transducer probes work to generate sound waves. Several probe units work together to generate a sound field to achieve material levitation. The phase of the electrical signal is processed by the electrical signal phase unit and the conducting thyristor to reduce material jitter. The drive mechanism is connected to the adjustable power module and adjusts the distance between the adaptive ultrasonic arrays through the control unit and the distance adjustment unit.

2. The material combustion diagnostic system according to claim 1, characterized in that, The adaptive adjustable ultrasonic array consists of 18 to 120 ultrasonic transducer probes.

3. The material combustion diagnostic system according to claim 1, characterized in that, The frequency of the ultrasonic transducer probe is 20-40kHz, and the adjustable voltage range is 10V-50V.

4. The material combustion diagnostic system according to claim 1, characterized in that, The adaptive ultrasonic array is a double-sided ultrasonic array with a drive mechanism. By adaptively adjusting the phase and distance of the ultrasonic array, a specific sound field is generated to suspend the material. The vibration of the suspended material is reduced by adjusting the rectifier. After the material is stably suspended, a laser is used to irradiate the material for combustion diagnosis.

5. The material combustion diagnostic system according to claim 1, characterized in that, An adaptively adjustable ultrasonic array generates a sound field through the operation of several ultrasonic transducer probes, thereby suspending the material being diagnosed.

6. The material combustion diagnostic system according to claim 5, characterized in that, The ultrasonic transducer probe has an operating temperature of -10 to 70°C, a minimum output sound pressure level of 110 dB, and a capacitance of 2400 pF.

7. The material combustion diagnostic system according to claim 1, characterized in that, The drive mechanism is connected to the adjustable power module and adjusts the distance between the adaptive ultrasonic arrays through the control unit and the distance adjustment unit. The drive mechanism is used to adjust the distance between the adaptive ultrasonic arrays so that the suspended material can be stabilized in the sound field generated by the ultrasonic array, laying the foundation for subsequent work.

8. The material combustion diagnostic system according to claim 1, characterized in that, The laser is used to generate external excitation on the material after it is stably suspended in the sound field, and to cause the material to burn; the high-speed camera is used to record the entire process of the material from ignition to complete combustion, providing data support for subsequent analysis; the computer is used to process the data captured by the high-speed camera.

9. A diagnostic method based on the material combustion diagnostic system according to any one of claims 1 to 8, characterized in that, Includes the following steps: S1. After connecting the combustion diagnostic system circuit, turn on the power supply and adjust the power supply voltage to make the system work normally. S2, The controller transmits the phase information to the processor; S3. The circuit control unit and the delayed signal transmission unit in the processor process the phase information and transmit it to the ultrasonic transducer probe of the adaptively adjusting ultrasonic array. S4. Start the rectifier to adjust the current phase and generate a more stable sound field; S5. Start the adaptive ultrasonic array, which works through several ultrasonic transducer probes to form a sound field between the adaptive ultrasonic arrays. The spacing between the arrays is adjusted by the drive mechanism to create a stable sound field. S6. After the sound field stabilizes, place the suspended material into the sound field; S7. After the material is stably suspended, turn on the laser and apply external excitation to the suspended material until the material can burn. S8. Use a high-speed camera to record the material suspension and the entire process from laser ignition to complete combustion of the material; S9. Use a computer to process and analyze the obtained data.

10. The diagnostic method based on the material combustion diagnostic system of claim 9, wherein the ultrasonic transducer has a vertically symmetrical structure, and the material is stably suspended in the sound field by adjusting the distance between the two-sided array.

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