CN112326866A - Experimental device and experimental method for researching ignition combustion process of modified aluminum powder - Google Patents
Experimental device and experimental method for researching ignition combustion process of modified aluminum powder Download PDFInfo
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- CN112326866A CN112326866A CN202011189739.3A CN202011189739A CN112326866A CN 112326866 A CN112326866 A CN 112326866A CN 202011189739 A CN202011189739 A CN 202011189739A CN 112326866 A CN112326866 A CN 112326866A
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Abstract
The invention relates to an experimental device and a method suitable for researching the ignition combustion process of modified aluminum powder, wherein the device comprises a combustion chamber, an ignition device, a gas conveying device and a detection device, wherein the combustion chamber comprises a cover body arranged on an experimental platform, the cover body and the experimental platform form the combustion chamber, and an ignition window is arranged on the upper side surface of the cover body; the ignition device comprises a laser igniter and a laser light outlet, the laser light outlet is over against the ignition window, and the laser igniter ignites a sample in the combustion chamber through the laser light outlet; the gas conveying device comprises a high-pressure gas tank and a gas conveying pipe, and the gas conveying pipe conveys gas in the high-pressure gas tank into the combustion chamber; the detection device comprises the optical fiber spectrometer and the temperature acquisition device, and the device or the method can react in real time and record the combustion temperature in the experimental process, and can accurately define the time points of the ignition start and the combustion end of the modified aluminum powder.
Description
Technical Field
The invention relates to an experimental device and an experimental method for researching an ignition combustion process of modified aluminum powder, and belongs to the technical field of material performance testing.
Background
Aluminum is the most abundant metal element in the crust, and has many advantages, such as high energy density, large specific impulse, and the combustion products are safe to the environment and human body without pollution, and aluminum is the most abundant metal element in the crust, and the mining means and refining technology are mature, the acquisition channel is convenient, and the price has certain advantages. In particular, aluminum, which is a highly active metal, can be burned in various atmospheres, for example, in oxidizing water or carbon dioxide, and can satisfy various needs. However, for the modified aluminum powder, it is difficult to perform flow combustion in a conventional engine, and it is also a difficult problem to define the ignition start and the combustion end and observe the combustion process. Particularly, the modified aluminum powder is burnt in a specific atmosphere, so that the problems of sample replacement, difficult collection of combustion product residues and the like exist.
Disclosure of Invention
In order to solve the problems, the invention provides a device convenient for researching the combustion performance of modified aluminum powder and a method for carrying out experiments by the device, the device or the method can carry out real-time reaction and record the combustion temperature in the experiment process, and the time points of the ignition start and the combustion end of the modified aluminum powder are accurately defined by measuring the obtained signal by an optical fiber spectrometer.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: an experimental device suitable for researching the ignition and combustion process of modified aluminum powder comprises a combustion chamber, an ignition device, a gas conveying device and a detection device,
the sample to be ignited is arranged in the combustion chamber, the combustion chamber comprises a cover body arranged on an experimental platform, the cover body and the experimental platform form the combustion chamber, an inlet for the sample to enter is arranged on the side surface of the cover body, a sliding rail leading from the outside to the inside is arranged at the inlet, a sample feeding device sliding along the sliding rail is arranged on the sliding rail, and an ignition window is arranged on the upper side surface of the cover body;
the ignition device comprises a laser igniter and a laser light outlet, the laser light outlet is over against the ignition window, and the laser igniter ignites a sample in the combustion chamber through the laser light outlet;
the gas conveying device comprises a high-pressure gas tank and a gas conveying pipe, and the gas conveying pipe conveys gas in the high-pressure gas tank into the combustion chamber;
the detection device comprises an optical fiber spectrometer and a temperature acquisition device, the optical fiber spectrometer is used for acquiring spectrum signals of a burning sample, the optical fiber spectrometer measures the spectrum signals for a plurality of times at set time intervals when the sample is burnt, and the temperature acquisition device is used for acquiring the burning temperature.
Further, the light spectrometer and the ignition device are synchronously triggered, the optical fiber spectrometer is triggered to measure 100 times each time, and the time interval of each measurement is 500 microseconds.
Furthermore, the temperature acquisition device comprises a thermocouple and a temperature data acquisition instrument, and the thermocouple is arranged in the combustion chamber.
Furthermore, a sample placing platform and a push rod are arranged on the sample conveying device, the sample placing platform is connected with the slide rail in a sliding mode, a baffle used for blocking an inlet of a sample on the cover body is fixedly arranged on the push rod, and after the sample placing platform moves to a set position along the slide rail, the baffle blocks the inlet of the sample.
Further, the detection device comprises a camera device, the camera device records the combustion condition of the sample through the cover body, and the cover body is a transparent quartz cover.
Furthermore, the experiment platform is a steel plate, the height of the experiment platform is adjustable, and the experiment platform is fixedly connected with the quartz cover.
Furthermore, the optical fiber spectrometer is calibrated by using a standard halogen tungsten lamp, and the spectral intensity after calibration is correspondingly converted into the real-time temperature of sample combustion to be used as the comparison of the temperature acquired by the temperature data acquisition device.
Furthermore, the laser igniter is a laser igniter with the maximum power of 600W, and the power and the light emitting size of the laser igniter can be adjusted;
the invention also discloses a method for researching the ignition combustion process of the modified aluminum powder by using the experimental device, which comprises the following steps
Pulling out the sample feeding device, weighing modified aluminum powder, stacking the modified aluminum powder at a laser spot-emitting position, and feeding the sample feeding device into a combustion chamber;
opening the high-pressure gas tank, ventilating for the first time, exhausting the air in the transparent cover body, putting the sample in the transparent cover body, and ventilating for a set time again;
triggering the laser igniter, recording the combustion phenomenon of the sample in the combustion process by the camera, recording the spectral change in the combustion process by the optical fiber spectrometer, converting the illumination intensity into the real-time temperature change in the combustion process, and taking the real-time temperature change as the comparison of the temperature data measured by the temperature acquisition device to ensure the reliability of the temperature data. Triggering a temperature acquisition device to record temperature change;
the ignition delay is obtained through data measured by the optical fiber spectrometer, the combustion temperature is obtained through data measured by the temperature acquisition device, the flame morphology is obtained through the video camera, and the agglomeration degree of aluminum particles is analyzed through an optical image shot by the high-speed camera.
Furthermore, the temperature curve obtained by the temperature acquisition device is compared with the flame appearance shot by the high-speed camera, so that the rules of different temperatures corresponding to different flame appearances can be explored.
Furthermore, the optical fiber spectrometer captures the spectrum signal at a set time interval after being triggered, when the optical fiber spectrometer measures the peak value signal with the wavelengths of 471, 486 and 512nm (the combustion characteristic peak of AlO generally appears at the same time, and the peak value signal at 486nm is mainly used as the basis because the signal at 486nm is the strongest), the ignition delay of the sample can be calculated, and the ignition delay calculation formula of the sample is Id=9+ (n-1) × 500 μ s. Where 500 mus is the measurement time interval set by the fiber optic spectrometer.
Further, the high-speed camera, the optical fiber spectrometer, the laser igniter and the temperature acquisition device are synchronously triggered.
The beneficial effects produced by the invention comprise:
(1) according to the invention, a peak signal with the wavelength of 486nm is firstly measured by the fiber spectrometer to be used as an ignition start, the signal intensity of the ignition start at the position of lambda =486nm is recorded, and when the signal intensity measured by the fiber spectrometer reaches the value again, the moment is defined as the end of combustion.
(2) The invention relates to an experimental device and a measurement method suitable for the combustion performance of modified aluminum powder in a non-air atmosphere combustion process.
(3) The experimental device and the measuring method suitable for the combustion performance of the modified aluminum powder in the non-air atmosphere combustion process synchronously process data acquisition equipment such as a high-speed camera, a laser igniter, an optical fiber spectrometer, a temperature acquisition device and the like, are simple and convenient to operate, and are convenient for parallel comparison of experimental data;
(4) according to the experimental device and the measuring method suitable for the combustion performance of the modified aluminum powder in the non-air atmosphere combustion process, after the point injection focusing of the laser igniter is completed, the focusing operation is not required to be carried out for many times, and the laser is injected downwards, so that the operation is safe and simple;
the experimental device and the measuring method suitable for the combustion performance of the modified aluminum powder in the non-air atmosphere combustion process have comprehensive obtained experimental data, are convenient for further analyzing the ignition combustion performance such as ignition delay, self-sustaining combustion duration, serious combustion agglomeration and the like in the modified aluminum powder combustion engineering, and are favorable for fully and further researching the combustion mechanism of the modified aluminum powder.
Drawings
FIG. 1 is a schematic structural diagram of an experimental device suitable for the combustion performance of modified aluminum powder in a non-air atmosphere combustion process according to the present invention;
FIG. 2 is a schematic view of the structure of a combustor in accordance with the present invention;
FIG. 3 is a schematic structural view of a sample pushing apparatus according to the present invention;
FIG. 4 is a graph of the 4 th signal acquisition of the fiber optic spectrometer in the combustion process in example 3;
number designations in the schematic drawings illustrate that:
1. a high pressure gas tank; 2. a volumetric flow meter; 3. a gas delivery pipe; 4. a transparent quartz cover; 5. an air inlet; 6. a laser igniter body; 7. a laser exit port; 8. a laser port adjusting nut; 9. a test platform plane; 10. fixing angle iron; 11. a laser entrance port; 12. a slide rail groove; 13. a sample pushing device; 14. a push rod; 15. a glass plate; 16. a high-speed camera; 17. a high-resolution lens; 18. a triangular bracket; 19. a fiber optic spectrometer; 20. an optical fiber head; 21. a temperature data acquisition instrument; 22. a computer; 23. a thermocouple; 24. and lifting the nut.
Detailed Description
The present invention is explained in further detail below with reference to the drawings and the specific embodiments, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Example 1
Referring to fig. 1, fig. 2 and fig. 3, the experimental device for investigating the combustion performance of the modified aluminum powder in the non-air atmosphere combustion process of the present embodiment includes a gas delivery device, an ignition device, a combustion chamber and a detection device.
The gas conveying device comprises a high-pressure gas bottle 1, a volume flow meter 2, a gas conveying pipe 3 and a gas inlet 5. The high-pressure gas bottle is used for storing the combustion atmosphere needed in the experiment, and can be correspondingly replaced according to the experiment requirement, and carbon dioxide is adopted in the example. The export of high-pressure gas bottle 1 is connected with volumetric flowmeter 2, and volumetric flowmeter 2 detects the volume flow of gas transmission, and the other side of volumetric flowmeter connects gas delivery pipe 3, and gas delivery pipe 3 is connected with air inlet 5. After the experiment is started, the high-pressure gas bottle 1 is opened, gas in the bottle passes through the volume flow meter 2 and enters the combustion chamber through the gas conveying pipe 3 and the gas inlet 5, and the required reaction atmosphere in the whole experiment is maintained. The gas flow rate during the experiment was set at 40 ml/min.
The ignition device mainly comprises a laser igniter main body 6, a laser exit port 7 and a laser port adjusting nut 8, wherein a cooling water pipe, a power supply circuit and the like are arranged in the laser igniter main body 6, three nuts for adjusting the laser exit direction are arranged on the laser exit port 7, and the laser exit direction is adjusted to be vertical downward so as to ensure the safety of the experiment. The laser output power in this embodiment was set to 50% of the maximum power.
The combustion chamber is composed of a transparent quartz cover 4, a laboratory bench plane 9, a fixed angle iron 10, a laser incident port 11, a slide rail groove 12, a sample pushing device 13, a push rod 14 and a glass plate 15, wherein an air inlet 5 is formed in one side of the transparent quartz cover 4, the air inlet 5 is made of quartz, the diameter of the air inlet is 5mm, a sealing ring is arranged at the joint of the air inlet and the transparent quartz cover, the transparent quartz cover 4 is fixed on the laboratory bench plane 9 through the fixed angle iron 10, the transverse section of the transparent quartz cover 4 is a square of 20x20cm, the height of the transparent quartz cover is 20cm, and angle irons are arranged around the transparent quartz cover for; the opening on the right side for the sample pushing device to enter and exit is 5cm wide and 1cm high; after the laser igniter 6 performs point shooting, the position of the transparent quartz cover 4 is adjusted, multiple times of focusing are not needed in the same group of experiments, the plane of the experiment table is a square plane with the side length of 30cm and the thickness of 4mm, the fixed angle iron 10 is made of a stainless steel plate, a lifting device below the plane of the experiment table is composed of 8 stainless steel pipes with the diameter of 5mm, two pairs of hinges and two nuts, the stainless steel pipes are connected in pairs through the hinges, the lifting height is 30-60cm by rotating the nuts, a laser entrance port 11 with the diameter of 10mm is reserved above the transparent quartz cover 4, a circular cover glass with the diameter of 15mm is arranged, gas is prevented from escaping in a large amount during gas inlet, a sliding rail groove 12 with the length of 15cm and the width of 2cm is arranged on the plane 9 of the experiment table, and can be used for a sample pushing device 13 to slide in and out, in the sample pushing device 13, the platform for placing the sample is made of a high-temperature-resistant tungsten plate with the size of 4x4cm, one side of the platform is connected with the push rod 14, the push rod 14 is pushed to push the sample pushing device 13 into the combustion chamber or take out combustion products from the combustion chamber, the length of the push rod 14 is 25cm, the push rod is made of stainless steel, a sealing glass plate 15 with the size of 6x2cm exists at the position of 12.5cm at the joint of the push rod 14 and the sample pushing device 13, and the inner side of the sealing glass plate is made of sealing rubber.
The detection device is composed of a high-speed camera 16, a high-resolution lens 17, a triangular support 18, a fiber spectrometer 19, a fiber head 20, a temperature data acquisition instrument 21, a computer 22 and a thermocouple 23. The model of the high-speed camera is Phantom, and is used for recording the flame appearance, the burning intensity, the self-sustaining burning duration and the burning situation of small splashed particles in the burning process of the modified aluminum powder, the shooting speed can be adjusted according to the resolution, the high-resolution lens 17 can be replaced by a micro-distance lens and the like according to the specific experimental requirements, in the embodiment, the resolution is set to be 320x720, the shooting speed is set to be 15000fps, the triangular support 18 is used for adjusting the position of the high-speed camera 16, the adjustment level comprises the adjustment level before the experiment, the high-resolution lens 17 is lifted to a proper position and the like, in the embodiment, after the triangular support 18 is adjusted to the sample burning area which can be clearly shot by the high-speed camera 16, the high-speed camera 16 is fixed by locking a movable buckle on the triangular support, the high-speed camera 16 is connected with, and standing by. The model of the optical fiber spectrometer 19 is Avantes8.11, the recording wavelength range is 400-plus 1100nm, and the optical fiber spectrometer is used for recording the spectrums of different wavelengths emitted by different substances during combustion of a sample, the optical fiber spectrum is provided with an optical fiber head 20 for enhancing signals in 19, the model is COL-UV/VIS-25, the optical fiber head 20 is fixed through a support on a test table plane 9 and collects spectrum signals, the height of the support is 5cm, the material is stainless steel, the optical fiber spectrometer 19 and a laser igniter 6 are synchronously triggered, the measurement is started 9 microseconds after the laser igniter 6 is ignited, the optical fiber spectrometer 19 measures 100 times with the time interval of 500 microseconds after triggering signals each time, the optical fiber spectrometer 19 can be calibrated by using a standard halogen tungsten lamp before the experiment is started, the spectrum intensity can be correspondingly converted into the real-time temperature of the sample combustion after calibration, in the embodiment, the aluminum powder combustion start is measured by the optical fiber spectrometer 19, The peak signals at 486nm and 512nm are based on, as shown in FIG. 4, the ignition delay of the sample is calculated as I when the peak signal is measured by the fiber spectrometer for the nth timed=9+（n-1）x500µAnd s. The model of the temperature data acquisition instrument 21 is Agilent 34972A, the thermocouple 23 is led out through the sliding rail groove 12 and is connected with the temperature data acquisition instrument 21, the temperature change condition of a sample during combustion can be reflected, the obtained temperature curve is subjected to secondary differentiation, a point with the temperature rise rate obviously increased is obtained, namely a first maximum value point in the secondary differentiation is used as a signal for sample ignition and can be compared with a signal measured by an optical fiber spectrometer, and the rigidness of an experiment is improved.
When the device is used, the laser igniter 6 is firstly opened, the sample pushing device 13 is sent into the combustion chamber by the push rod 14, the laser igniter 6 shoots, and the ignition position is determined. Fixing the transparent quartz cover 4, erecting the high-speed camera 16, synchronizing the high-speed camera 16, the optical fiber spectrometer 19 and the laser igniter 6, and waiting for triggering. And pulling out the sample pushing device 13, weighing 50mg of modified aluminum powder, stacking the modified aluminum powder at a laser spot-shooting position, enabling the thermocouple 23 to be close to a sample combustion area, and sending the sample pushing device 13 into a combustion chamber. Opening the Ar gas steel cylinder 1, adjusting the gas flow to 40ml/min, ventilating for 10min for the first time, exhausting the air in the transparent quartz cover 4, and then when replacing the sample and burning, ventilating for 3 min. Triggering the laser igniter 6, recording the combustion phenomenon of the sample in the combustion process by the high-speed camera 16, recording the spectrum change in the combustion process by the optical fiber spectrometer 19, and converting the illumination intensity into the real-time temperature change in the combustion process. All data can be processed and analyzed at the computer 22 after combustion is complete. In this embodiment, the modified aluminum powder can be applied to CO2Ignition delay, ignition temperature, self-sustaining combustion duration, flame morphology, particle agglomeration degree and the like in the atmosphere are researched, and the combustion products can be analyzed and tested by a Scanning Electron Microscope (SEM), a Transmission Electron Microscope (TEM), X-ray diffraction (XRD) and the like, so that the combustion mechanism of the modified aluminum powder is researched.
Example 2
The experimental device for researching the combustion performance of the modified aluminum powder in the combustion process in the non-air atmosphere in the embodiment has the same basic structure as that in the embodiment 1, except that: the sample placing area was changed to a heat-resistant crucible, and an argon (Ar) cylinder was used as a high-pressure gas cylinder 1 connected to a volume flow meter 2 and a gas delivery pipe 3.
When the high-energy fuel combustion chamber is used, 100mg of aluminum/water-based high-energy fuel is weighed and placed in an ignition area, the thermocouple 23 is close to a sample combustion area, the sample pushing device 13 is sent into the combustion chamber, then the high-pressure gas bottle 1 is slowly opened, Ar gas is introduced into the combustion chamber for ten minutes at the speed of 40ml/min, the laser igniter 6 is used for ignition, the high-speed camera 16 and the optical fiber spectrometer 19 are synchronously triggered, visual images of the combustion process and spectral signals in the combustion process are respectively recorded, and the intensity of the spectral signals can be converted into the temperature in the combustion process. The temperature signals collected by the fiber spectrometer and the temperature collecting device can comprehensively reflect the ignition delay, the combustion temperature, the self-sustaining combustion duration and the like of the aluminum-based fuel, and the optical image shot by the high-speed camera can analyze the flame appearance and the agglomeration degree of aluminum particles. In the embodiment, the ignition delay, the ignition temperature, the self-sustaining combustion duration, the flame morphology, the particle agglomeration degree and the like of the aluminum-based fuel with certain fluidity in the Ar atmosphere can be studied, and the combustion product can be analyzed and tested by a Scanning Electron Microscope (SEM), a Transmission Electron Microscope (TEM), X-ray diffraction (XRD) and the like, so that the combustion mechanism of the modified aluminum powder can be studied.
Example 3
The experimental device for researching the combustion performance of the modified aluminum powder in the combustion process in the non-air atmosphere in the embodiment has the same basic structure as that in the embodiment 1, except that: and (3) approaching the thermocouple 23 to the sample combustion area, and connecting the thermocouple 23 with the temperature data acquisition instrument 21 through the slide rail groove 12 and completing synchronization with the laser igniter 6. The thermocouple model is K type.
When the device is used, 50mg of modified aluminum powder added with 0%, 2%, 5%, 8% and 10% of Ammonium Perchlorate (AP) is weighed, argon (Ar) is used as a combustion atmosphere, a high-speed camera 16 and a fiber spectrometer 19 are used after ignition, a combustion process visual image and a combustion process spectral signal are recorded respectively, and the spectral signal intensity can be converted into the combustion process temperature. Since the light spectrometer is triggered by the signal of the laser igniter, the ignition delay of the sample can be measured by the fiber optic spectrometer. In this embodiment, the fiber optic spectrometer mainly measuresThe spectral signal during the experiment, the measurement interval of the fiber spectrometer is 850 mus, wherein the fourth measurement signal of the fiber spectrometer is shown in figure 4, and a distinct peak signal appears at 486nm, so that the moment is defined as the ignition start of the sample and the ignition delay time I of the sampled=9+850 × 3=2.559 ms. The temperature data acquisition instrument 21 can also record temperature signals in the combustion process, and can compare the temperature signals with data obtained by analysis of the fiber spectrometer 19 and the high-speed camera 16, so that the experimental rigor is improved.
Example 4
Step one, arranging modified aluminum powder (such as modified aluminum powder):
opening the laser igniter (6), pushing the sample conveying device (13) into the quartz glass cover (4), and performing point shooting by the laser igniter (6) to determine the ignition position of the laser igniter;
pulling out the sample conveying device (13) through a push rod (14), placing a proper amount (about 20 micrograms) of prepared modified aluminum powder on an ignition position of a laser igniter, feeding the sample conveying device again, and sealing a glass plate (15);
step two, introducing gas, synchronizing the equipment:
opening an air valve of the high-pressure gas tank (1), and covering a laser incident port (11) with a cover glass; opening the high-speed camera, the optical fiber spectrometer and the temperature data acquisition device to complete synchronization;
step three, data acquisition:
temperature change signals of a sample during combustion are collected through the thermocouple (23), and the electric signals are transmitted to the computer (22) to be converted into temperature values, and the computer (22) can record the temperature values in real time; meanwhile, the high-speed camera (16) records the burning video of the sample when the sample starts to burn, and the shooting speed can be adjusted according to the size of the pixel; when the laser igniter (6) starts to ignite, the optical fiber spectrometer starts to record a spectrum signal, and the recording range is 400-1100 nm; after the combustion experiment is finished, the gas valve of the high-pressure gas bottle (1), the temperature data acquisition instrument (23), the high-speed camera (16), the optical fiber spectrometer (19), the laser igniter (6) and the computer (22) are closed in sequence.
In the description of the present application, it is to be understood that the terms "central," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be considered limiting of the claimed invention.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the content of the embodiment. It will be apparent to those skilled in the art that various changes and modifications can be made within the technical scope of the present invention, and any changes and modifications made are within the protective scope of the present invention.
Claims (10)
1. The utility model provides an experimental apparatus suitable for research modified aluminite powder ignition combustion process which characterized in that: comprises that
A combustion chamber, an ignition device, a gas delivery device and a detection device,
the combustion chamber is used for placing a sample to be ignited, the combustion chamber comprises a cover body arranged on an experimental platform, the cover body and the experimental platform form the combustion chamber, an inlet for the sample to enter is arranged on the side surface of the cover body, a sliding rail leading from the outside to the inside is arranged at the inlet, a sample feeding device sliding along the sliding rail is arranged on the sliding rail, and an ignition window is arranged on the upper side surface of the cover body;
the ignition device comprises a laser igniter and a laser light outlet, the laser light outlet is over against the ignition window, and the laser igniter ignites a sample in the combustion chamber through the laser light outlet;
the gas conveying device comprises a high-pressure gas tank and a gas conveying pipe, and the gas conveying pipe conveys gas in the high-pressure gas tank into the combustion chamber;
the detection device comprises an optical fiber spectrometer and a temperature acquisition device, the optical fiber spectrometer is used for acquiring spectrum signals of a burning sample, the optical fiber spectrometer measures the spectrum signals for a plurality of times at set time intervals when the sample is burnt, and the temperature acquisition device is used for acquiring the burning temperature.
2. The experimental device suitable for researching the ignition combustion process of the modified aluminum powder as claimed in claim 1, wherein: the light ray spectrometer and the ignition device are synchronously triggered, the optical fiber spectrometer is triggered to measure 100 times each time, and the time interval of each measurement is 500 microseconds.
3. The experimental device suitable for researching the ignition combustion process of the modified aluminum powder as claimed in claim 1, wherein: the temperature acquisition device comprises a thermocouple and a temperature data acquisition instrument, and the thermocouple is arranged in the combustion chamber.
4. The experimental device suitable for researching the ignition combustion process of the modified aluminum powder as claimed in claim 1, wherein: the sample feeding device is provided with a sample placing platform and a push rod, the sample placing platform is connected with the slide rail in a sliding mode, a baffle used for blocking a sample inlet in the cover body is arranged on the push rod, and after the sample placing platform moves to a set position along the slide rail, the baffle blocks the sample inlet.
5. The experimental device suitable for researching the ignition combustion process of the modified aluminum powder as claimed in claim 1, wherein: the detection device comprises a camera device, the camera device records the combustion condition of the sample through the cover body, and the cover body is a transparent quartz cover.
6. The experimental device suitable for researching the ignition combustion process of the modified aluminum powder as claimed in claim 1, wherein: the experiment platform is a steel plate, the height of the experiment platform is adjustable, and the experiment platform is fixedly connected with the quartz cover.
7. The experimental device suitable for researching the ignition combustion process of the modified aluminum powder as claimed in claim 1, wherein: the optical fiber spectrometer is calibrated by using a standard halogen tungsten lamp, and the spectral intensity after calibration is correspondingly converted into the real-time temperature of sample combustion.
8. A method for researching the ignition combustion process of modified aluminum powder by using the experimental device of claim 1, which is characterized in that: comprises the following steps
Pulling out the sample feeding device, weighing the modified aluminum powder, placing the modified aluminum powder on the sample feeding device, and feeding the sample feeding device into a combustion chamber;
opening the high-pressure gas tank, ventilating for the first time, exhausting the air in the transparent cover body, putting the sample in the transparent cover body, and ventilating for a set time again;
triggering a laser igniter to ignite the modified aluminum powder, recording a combustion phenomenon in a sample combustion process by a camera, recording a spectral change in the combustion process by an optical fiber spectrometer, converting illumination intensity into a change in the combustion process, and triggering a temperature acquisition device to record a temperature change;
the ignition delay is obtained through data measured by the optical fiber spectrometer, the combustion temperature is obtained through data measured by the temperature acquisition device, the flame morphology is obtained through the camera, and the agglomeration degree of the aluminum particles is analyzed through an optical image shot by the camera.
9. The method for researching the ignition combustion process of the modified aluminum powder as claimed in claim 8, wherein: the time point of a typical characteristic peak signal of the aluminum oxygen combustion measured by the optical fiber spectrometer is the ignition starting point of the sample, the optical fiber spectrometer obtains a characteristic peak in the spectral signal obtained at the nth time, and the ignition delay calculation formula of the sample is IdAnd the t is the measurement time interval set by the fiber spectrometer, and is =9+ (n-1) t.
10. The method for researching the ignition combustion process of the modified aluminum powder as claimed in claim 9, wherein: typical characteristic peaks of alundum combustion are 471, 486 and 512 nm.
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| CN113640453A (en) * | 2021-08-19 | 2021-11-12 | 常州大学 | Combustion device and method suitable for testing properties of solid-liquid fuel |
| CN113686920A (en) * | 2021-08-19 | 2021-11-23 | 常州大学 | Experimental device and method suitable for suspension combustion of solid propellant |
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| CN114687890A (en) * | 2022-04-26 | 2022-07-01 | 常州大学 | High-efficient laser ignition solid fuel combustion device |
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| CN117092277A (en) * | 2023-07-07 | 2023-11-21 | 华中科技大学 | Dynamic analysis device and method for dynamic parameters of solid fuel combustion reaction |
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