System for diagnosing combustion of single particles in different atmospheres

Abstract

The invention discloses a system for combustion diagnosis of single particles in different atmospheres, which belongs to the technical field of combustion diagnosis and comprises a suspension combustion chamber, a gas supply system, a suspension control system, a measurement control system and an exhaust system. The suspension combustion chamber comprises a spherical shell, lenses symmetrically arranged on the shell and piezoelectric transducers arranged in the circumferential direction of the inner wall of the shell, the gas supply system is used for providing combustion environments of different gases for the interior of the shell, the suspension control system is used for driving the piezoelectric transducers, and the measurement control system is used for measuring, collecting and analyzing data; according to the invention, the combustion chamber and the piezoelectric transducer are combined to form an integrated suspension combustion chamber, so that the structure is more compact, and the experiment is simpler and more convenient; the combustion chamber is designed to be in a spherical shell shape, the piezoelectric transducers can be evenly distributed in the combustion chamber, the number of the piezoelectric transducers is increased, meanwhile, all the piezoelectric transducers point to the center of the combustion chamber, and the suspension capacity can be greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of combustion diagnosis, and in particular to a system for single particle combustion diagnosis in different atmospheres. Background Art

[0002] Particle combustion is a widespread energy release process in weapon systems such as rocket engines. The combustion of metal fuels in solid propellants, powder ramjets, and powder detonation engines is essentially particle combustion. Therefore, a deeper understanding of the combustion process of single particles is of great significance for the development of weapon systems. Traditional research methods for single-particle combustion, such as contact methods like stages and suspended wires, often result in significant heat conduction losses, leading to a certain degree of distortion in measurement results. Levitated combustion is an important approach for capturing the intrinsic combustion behavior of single particles. It eliminates contact heat conduction between the sample and the carrier, effectively ensuring the accuracy of single-particle combustion parameter measurements. Currently, levitation methods such as pneumatic levitation, electromagnetic levitation, and optical levitation have been applied to single-particle combustion diagnostics, 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.

[0003] Acoustic levitation devices can stably suspend particles for a long time and have strong levitation capabilities, making them a good choice for levitation combustion tests. However, most current ultrasonic levitation combustion diagnostic devices are single-axis levitation devices and the levitation device is separated from the combustion chamber. The levitation strength, stability, and compactness of the device need to be further improved. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a system for single particle combustion diagnosis in different atmospheres, which solves the problems of weak suspension strength, stability and compactness of existing devices.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] A system for single-particle combustion diagnosis in different atmospheres includes a suspended combustion chamber, an air supply system, a suspension control system, a measurement control system, and an exhaust system. The suspended combustion chamber includes a spherical shell, lenses symmetrically arranged on the shell, and piezoelectric transducers evenly spaced circumferentially on the inner wall of the shell. The air supply system is used to provide a combustion environment for different gases in the shell, the suspension control system is used to drive the piezoelectric transducers, the measurement control system is used to measure, collect, and analyze data, and the exhaust system is used to remove exhaust gas from the shell and balance the internal and external pressures.

[0007] Preferably, the gas supply system includes a high-pressure gas cylinder, which is connected to the housing through a pipeline, and a solenoid valve is provided on the pipeline.

[0008] Preferably, the suspension control system includes a signal generator and a power amplifier connected in sequence, and the power amplifier is connected to the piezoelectric transducer.

[0009] Preferably, the measurement and control system includes a computer, a laser igniter arranged on the outside of one of the lenses, an infrared thermal imager, a spectrometer and a high-speed camera, and a pressure sensor arranged on the outside of the lens on the symmetrical side. The high-speed camera is used to record the entire process of a single particle from ignition to complete combustion, providing data support for subsequent analysis; the infrared thermal imager receives infrared radiation energy during the combustion process and feeds it back to the photosensitive element to obtain an infrared thermal image; the spectrometer observes, analyzes and processes the structure and composition of the burning particles; and the computer is used to record and receive data.

[0010] Preferably, the exhaust system includes an exhaust valve, which is controlled to open or close by the computer and is used to discharge exhaust gas from the suspended combustion chamber and balance the internal and external pressures.

[0011] Preferably, the number of the piezoelectric transducers is adjustable and they are connected in parallel, the operating frequency is 40 kHz, and the adjustable voltage range is 10-100V.

[0012] Preferably, the outer diameter of the housing is 50 mm to 60 mm, the inner diameter is 45 mm to 55 mm, the piezoelectric transducer is 40 mm away from the center of the housing, and the diameter of the lens is 10 mm.

[0013] Preferably, the lens is a zinc selenide glass window, the edge of the lens is threaded, and is connected to the housing using threads.

[0014] Compared with the prior art, the present invention has achieved the following technical effects:

[0015] 1. Combining the combustion chamber with the piezoelectric transducer to form an integrated suspended combustion chamber makes the structure more compact and the experiment easier;

[0016] 2. The combustion chamber is designed to be in the shape of a spherical shell, so that the piezoelectric transducers can be evenly distributed inside, increasing the number of piezoelectric transducers. At the same time, all piezoelectric transducers point to the center of the combustion chamber, which can greatly improve the suspension ability.

[0017] 3. Use a combination of a signal generator and a power amplifier to drive the piezoelectric transducer. By adjusting the parameters of the signal generator and the power amplifier, the electrical signal can be made most suitable for driving the piezoelectric transducer, making the suspension ability stronger and more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate 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.

[0019] Attachment Figure 1 It is a structural schematic diagram of the present invention;

[0020] Among them, 1. High-pressure gas cylinder; 2. Solenoid valve; 3. Laser igniter; 4. Pressure sensor; 5. Computer; 6. Housing; 7. Spectrometer; 8. High-speed camera; 9. Infrared thermal imager; 10. Signal generator; 11. Power amplifier; 12. Piezoelectric transducer; 13. Lens; 14. Exhaust valve. DETAILED DESCRIPTION

[0021] 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. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0022] The present invention provides a system for single particle combustion diagnosis in different atmospheres, which solves the problems of weak suspension strength, stability and compactness of existing devices.

[0023] 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.

[0024] refer to Figure 1 , a system for single-particle combustion diagnosis in different atmospheres, including a suspended combustion chamber, an air supply system, a suspension control system, a measurement control system and an exhaust system, wherein the suspended combustion chamber includes a spherical shell 6, lenses 13 symmetrically arranged on the shell 6, and piezoelectric transducers evenly spaced on the circumference of the inner wall of the shell 6, the air supply system is used to provide a combustion environment of different gases in the shell, the suspension control system is used to drive the piezoelectric transducer, the measurement control system is used to measure, collect and analyze data, and the exhaust system is used to remove exhaust gas in the shell and balance the internal and external pressures; the present invention combines the combustion chamber with the piezoelectric transducer to form an integrated suspended combustion chamber, making the structure more compact and the experiment simpler; the combustion chamber is designed to be in the shape of a spherical shell, the piezoelectric transducers can be evenly distributed inside, increasing the number of piezoelectric transducers, and at the same time all the piezoelectric transducers point to the center of the combustion chamber, which can greatly improve the suspension ability.

[0025] refer to Figure 1 The gas supply system includes a high-pressure gas cylinder 1, which is connected to the shell through a pipeline, and a solenoid valve 2 is provided on the pipeline.

[0026] refer to Figure 1 The suspension control system includes a signal generator 10 and a power amplifier 11 connected in sequence, and the power amplifier is connected to the piezoelectric transducer; the signal generator 10 can generate a signal with adjustable amplitude, phase, frequency and waveform, and the power amplifier 11 is connected to the signal generator 10 and the piezoelectric transducer. The power amplifier 11 receives the signal generated by the signal generator 10, amplifies the signal and drives the piezoelectric transducer to work; by adjusting the parameters of the signal generator 10 and the power amplifier 11, the electrical signal can be made most suitable for driving the piezoelectric transducer.

[0027] Furthermore, the piezoelectric transducers are connected in parallel to ensure synchronization between the piezoelectric transducers.

[0028] refer to Figure 1 The measurement and control system includes a computer 5, a laser igniter 3 arranged on the outside of one of the lenses, an infrared thermal imager 9, a spectrometer 7 and a high-speed camera 8 arranged on the outside of the lens 13 on the symmetrical side, and a pressure sensor 4. The high-speed camera 8 is used to record the entire process of a single particle from ignition to complete combustion, providing data support for subsequent analysis; the infrared thermal imager 9 receives infrared radiation energy during the combustion process and feeds it back to the photosensitive element to obtain an infrared thermal image; the spectrometer 7 observes, analyzes and processes the structure and composition of the burning particles; and the computer 5 is used to record and receive data.

[0029] refer to Figure 1 The exhaust system includes an exhaust valve 14, which is controlled by the computer to remove exhaust gas from the suspended combustion chamber and balance the internal and external pressures.

[0030] Furthermore, the number of piezoelectric transducers is adjustable and they are connected in parallel, the operating frequency is 40 kHz, and the adjustable voltage range is 10 to 100 V.

[0031] Furthermore, the outer diameter of the housing is 50 mm to 60 mm, the inner diameter is 45 mm to 55 mm, the piezoelectric transducer is 40 mm away from the center of the housing, and the diameter of the lens is 10 mm.

[0032] Furthermore, the lens 13 is a zinc selenide glass window, the edge of the lens 13 is threaded, and is connected to the housing 6 using threads; this makes it easier to install and remove the lens 13; the housing 6 and the lens 13 together form a closed combustion environment.

[0033] A method for using a system for single particle combustion diagnosis in different atmospheres comprises the following steps:

[0034] Step 1: Connect the diagnostic system circuit and gas path, place the single particle to be diagnosed in the suspension combustion chamber, and install the lens 13;

[0035] Step 2: The piezoelectric transducer is controlled by a signal generator to observe the suspension of the single particle and adjust the amplitude and phase of the signal to achieve stable suspension of the single particle;

[0036] Step 3: After the single particle is stably suspended, open the solenoid valve 2 and the exhaust valve 14 to continuously supply gas to the suspension combustion chamber. When the suspension combustion chamber is filled with the corresponding gas, close the exhaust valve 14.

[0037] Step 4: The high-pressure gas cylinder 1 continues to supply gas. When the pressure value recorded by the computer reaches the test requirement, the solenoid valve 2 is closed;

[0038] Step 5: After the single particle is stably suspended, the laser igniter 3 is turned on by computer control, and the ignition power is controlled by the computer to perform laser ignition;

[0039] Step 6: High-speed camera 8, spectrometer 7, and infrared thermal imager 9 record data of the entire process from the start of ignition to complete combustion of the single particle;

[0040] Step 7: After the experiment is completed, turn off the laser igniter 3 and the signal generator 10, open the exhaust valve, and wait until the pressure in the suspension combustion chamber drops to one atmosphere before removing the lens 13.

[0041] Furthermore, the high-pressure gas cylinder 1 is provided with different gas compositions as required to supply gas to the suspended combustion chamber and provide a combustion environment with different pressures and atmospheres.

[0042] 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 therein. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

Claims

1. A system for single particle combustion diagnosis in different atmospheres, characterized in that: It includes a suspended combustion chamber, an air supply system, a suspension control system, a measurement and control system, and an exhaust system. The suspended combustion chamber includes a spherical shell, lenses symmetrically arranged on the shell, and piezoelectric transducers evenly spaced on the circumference of the inner wall of the shell. The air supply system is used to provide a combustion environment of different gases in the shell, the suspension control system is used to drive the piezoelectric transducers, the measurement and control system is used to measure, collect and analyze data, and the exhaust system is used to remove exhaust gas in the shell and balance the internal and external pressures.

2. The system for single particle combustion diagnosis in different atmospheres according to claim 1, characterized in that: The gas supply system includes a high-pressure gas cylinder, which is connected to the housing through a pipeline, and a solenoid valve is provided on the pipeline.

3. The system for single particle combustion diagnosis in different atmospheres according to claim 1, characterized in that: The suspension control system includes a signal generator and a power amplifier connected in sequence, and the power amplifier is connected to the piezoelectric transducer.

4. The system for single particle combustion diagnosis in different atmospheres according to claim 1, characterized in that: The measurement and control system includes a computer, a laser igniter arranged on the outside of one of the lenses, an infrared thermal imager, a spectrometer and a high-speed camera, and a pressure sensor arranged on the outside of the lens on the symmetrical side. The high-speed camera is used to record the entire process of a single particle from ignition to complete combustion, providing data support for subsequent analysis; the infrared thermal imager receives infrared radiation energy during the combustion process and feeds it back to the photosensitive element to obtain an infrared thermal image; the spectrometer observes, analyzes and processes the structure and composition of the burning particles; and the computer is used to record and receive data.

5. The system for single particle combustion diagnosis in different atmospheres according to claim 4, characterized in that: The exhaust system includes an exhaust valve, which is controlled to open and close by the computer and is used to exhaust the exhaust gas in the suspended combustion chamber and balance the internal and external pressures.

6. The system for single particle combustion diagnosis in different atmospheres according to claim 1, characterized in that: The number of the piezoelectric transducers is adjustable and they are connected in parallel with each other. The operating frequency is 40kHz and the adjustable voltage range is 10-100V.

7. The system for single particle combustion diagnosis in different atmospheres according to claim 1, characterized in that: The outer diameter of the shell is 50mm to 60mm, and the inner diameter is 45mm to 55mm. The piezoelectric transducer is 40mm away from the center of the shell, and the diameter of the lens is 10mm.

8. The system for single particle combustion diagnosis in different atmospheres according to claim 1, characterized in that: The lens is a zinc selenide glass window, the edge of the lens is threaded, and is connected to the housing via threads.

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