Device and method for measuring free propagation flame of hydrogen combustion under action of sound waves

Abstract

The invention provides a device and a method for measuring free propagation flame of hydrogen combustion under the action of sound waves, relates to the field of hydrogen combustion measurement, and aims to solve the problems that the controllability of flame propagation and stability is poor and the influence of the sound waves on the hydrogen combustion flame is difficult to accurately obtain due to the lack of effective control and analysis on wall surface temperature in the conventional device. By arranging the wall surface cooling system, the temperature of the wall surface of the chamber is effectively controlled, and the influence of the wall surface on flame propagation and stability is reduced, so that the accuracy of an experiment for obtaining the influence of sound waves on hydrogen-burning flames is improved; the chemiluminescence detection system can more accurately measure the free radical concentration of the front edge of the flame, and complete dynamic analysis is provided for flame propagation and combustion efficiency; a wall surface cooling system and a chemiluminescence detection system are combined, so that experimental conditions can be more accurately controlled and analyzed, and a powerful tool is provided for research on free propagation of flames by hydrogen combustion under the action of sound waves.

Description

Technical Field

[0001] The invention relates to the field of hydrogen combustion measurement, and in particular to a device and method for measuring a free propagation flame of hydrogen combustion under the action of sound waves. Background Art

[0002] As a clean and efficient fuel, hydrogen has important applications in the future energy system. The flame propagation characteristics during hydrogen combustion have a significant impact on combustion stability and efficiency. It is of great significance to control flame propagation and avoid flashback or detonation and study the modulation effect of sound waves on hydrogen flames. In the existing technology, most studies focus on combustion in closed containers or flame propagation under the action of limited sound fields, but lack systematic research on high-precision measurement using heat capacity bombs.

[0003] A Chinese patent (publication number CN 108318254 B) discloses a device and method for measuring the influence of sound waves on a freely propagating flame, comprising a constant volume combustion bomb, a sampling system, an ignition system, an optical schlieren system and an acoustic system. The acoustic system is used to provide acoustic excitation to the chamber of the constant volume combustion bomb and process the acoustic wave information. The two flanges on the top and bottom surfaces of the chamber are both equipped with transparent windows, which serve as the optical path of the optical schlieren system to record the flame propagation process under the action of sound waves. Although the schlieren method has a certain transient capture capability, it is less efficient in analyzing complex flame structures. Moreover, during the hydrogen combustion process, the chamber wall temperature has a prominent influence on the flame propagation and stability. The current device lacks control analysis of the wall temperature, resulting in poor controllability of flame propagation and stability, and it is difficult to accurately obtain the influence of sound waves on the hydrogen combustion flame. Summary of the invention

[0004] The purpose of the present invention is to provide a measurement device and method for the free propagation of hydrogen burning flame under the action of sound waves in view of the defects of the prior art. A wall cooling system is configured to control the wall temperature to avoid wall interference. The chemiluminescence detection system can more accurately measure the free radical concentration at the flame front through the chemiluminescence method. The wall cooling system provides temperature data, and the chemiluminescence detection system provides free radical concentration data. The combination of the two provides a complete dynamic analysis of flame propagation and combustion efficiency, controls experimental conditions, and improves the experimental accuracy of obtaining the influence of sound waves on hydrogen burning flames.

[0005] The first object of the present invention is to provide a device for measuring a free propagation flame of hydrogen combustion under the action of acoustic waves, which adopts the following scheme:

[0006] include:

[0007] A constant volume incendiary bomb is provided with a chamber in which an ignition electrode is installed;

[0008] A sample injection system, including a gas cylinder, which is connected to the chamber through a main pipe with a control valve;

[0009] A wall cooling system, comprising a cooling pipe, a cooling pump and a temperature sensor, wherein the cooling pipe is coiled in the chamber and connected to the cooling pump, and the temperature sensor is installed in the chamber to measure the chamber temperature and send it to the controller;

[0010] The chemiluminescence detection system is provided with a detection end, which is installed on a window opened on the side wall of the chamber to collect images in the chamber and send them to the controller;

[0011] An acoustic system, including a speaker, is installed in the chamber and connected to a controller.

[0012] Furthermore, the sampling system also includes a vaporizer and a vacuum pump. The gas cylinder is connected to the main line through a first pipeline, the vaporizer is connected to the main line through a second pipeline, and is connected to a liquid sampling pump. The vacuum pump is connected to the main line through a third pipeline. The main line is also provided with a temperature control system and a pressure detection unit.

[0013] Furthermore, the first pipeline is provided with a first valve, the second pipeline is provided with a second valve, the third pipeline is provided with a third valve, the control valve is a fourth valve, and the pressure detection unit measures the pressure in the chamber and sends it to the controller.

[0014] Furthermore, the temperature control system includes a temperature control module, a first heating unit and a second heating unit, the first heating unit is installed on the main line and the pipeline connected to the main line, the second heating unit is installed in the chamber, and the temperature control module is connected to the controller.

[0015] Furthermore, the ignition electrode is connected to a power source, and a trigger of the ignition electrode is connected to a controller.

[0016] Furthermore, the range in which the cooling pipe acts on the chamber is divided into a plurality of cooling zones, and the cooling pipe corresponding to each cooling zone is independently distributed, so as to control the operation of the cooling pipe corresponding to the cooling zone respectively.

[0017] Furthermore, a plurality of temperature sensors are installed in the chamber, respectively corresponding to the plurality of cooling zones.

[0018] Furthermore, the detection end and the chamber of the chemiluminescence detection system are coaxially arranged.

[0019] The second object of the present invention is to provide a working method of the device for measuring a free propagation flame of hydrogen burning under the action of sound waves as described in the first object, comprising:

[0020] The premixed hydrogen and combustible gas are charged into the constant volume combustion bomb through the injection system;

[0021] The controller controls the speaker of the acoustic system to emit sound waves, keeps the chemiluminescence detection system in working state, and uses the wall cooling system to control the temperature in the chamber;

[0022] The hydrogen combustible gas in the chamber of the constant volume combustion bomb is ignited by the ignition electrode. The chemiluminescence detection system obtains the transient process of flame propagation and monitors the luminescence front of free radicals, captures the flame propagation speed, and sends it to the controller for analysis.

[0023] Furthermore, after an experiment is completed, the residual gas in the chamber is exhausted, and the premixed hydrogen combustible gas is refilled, and the temperature in the chamber is adjusted by using the wall cooling system before the experiment is carried out again.

[0024] Compared with the prior art, the present invention has the following advantages and positive effects:

[0025] (1) By configuring the wall cooling system, the temperature of the chamber wall is effectively controlled, reducing the influence of the wall on flame propagation and stability, thereby improving the accuracy of obtaining the effect of sound waves on hydrogen combustion flame experiments. The chemiluminescence detection system can more accurately measure the free radical concentration at the flame front, providing a complete dynamic analysis of flame propagation and combustion efficiency. Combining the wall cooling system and the chemiluminescence detection system, the experimental conditions can be more accurately controlled and analyzed to meet the research needs of free propagation of hydrogen combustion flames under the action of sound waves.

[0026] (2) The introduction of cooling pipes and temperature sensors solves the problem of the need to accurately control the chamber temperature in the injection system. By dividing the chamber into multiple cooling zones and controlling the operating status of each cooling pipe separately, and monitoring the temperature of each cooling zone in real time through temperature sensors, the flow rate and temperature of the coolant are adjusted according to the feedback from the temperature sensors. The cooling pump is used to transport the coolant to the cooling pipe, and the flow rate is adjustable to meet different temperature control requirements. This ensures that the chamber operates stably within the predetermined temperature range, thereby improving the accuracy and stability of the experiment.

[0027] (3) During the entire sampling process, the temperature control system and pressure detection unit will monitor the sample temperature and the pressure in the chamber in real time and send the data to the controller. The controller adjusts the sample temperature and the working state of the vacuum pump according to the monitoring data to ensure the stability and accuracy of the experimental conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0029] Figure 1 Schematic diagram of the measuring device for the free propagation flame of hydrogen burning under the action of sound waves in Examples 1 and 2 of the present invention.

[0030] Among them, 1. speaker; 2. ignition electrode; 3. second window; 4. first window; 5. gas cylinder; 6. liquid sampling pump; 7. vaporization tank; 8. pressure detection unit; 9. vacuum pump; 10. first pipeline; 11. second pipeline; 12. third pipeline; 13. main pipeline; 14. first valve; 15. second valve; 16. third valve; 17. fourth valve; 18. temperature control system; 20. high-speed camera; 21. computer system; 22. constant volume combustion bomb; 23. ignition system; 24. chamber; 25. first flange; 26. second flange; 28. lens; 30. aperture; 36. cooling pipe; 37. temperature control module; 38. cooling pump; 39. temperature sensor; 40. photomultiplier tube; 42. fifth valve. DETAILED DESCRIPTION

[0031] Example 1

[0032] In a typical embodiment of the present invention, Figure 1 As shown, a measuring device for the free propagation flame of hydrogen burning under the action of sound waves is given.

[0033] Although the traditional Schlieren method has a certain ability to capture transients, it is less efficient when analyzing complex flame structures and is difficult to meet the needs of high-precision and high-speed flame dynamic analysis. During hydrogen combustion, the wall temperature of chamber 24 has a significant impact on the propagation and stability of the flame. The existing device lacks effective control and analysis of the wall temperature, resulting in poor controllability of flame propagation and stability, and it is difficult to accurately obtain the impact of sound waves on hydrogen flames. Due to the influence of factors such as the above-mentioned wall temperature, it is difficult for the existing technology to achieve effective control of flame propagation and stability, thereby affecting the accuracy of the measurement of the impact of sound waves on hydrogen flames. Based on this, this embodiment provides a measurement device for the free propagation flame of hydrogen combustion under the action of sound waves. By configuring a wall cooling system, the temperature of the wall of chamber 24 is effectively controlled, and the impact of the wall on flame propagation and stability is reduced, thereby improving the accuracy of obtaining the experiment of the impact of sound waves on hydrogen flames. The chemiluminescence detection system can more accurately measure the free radical concentration at the flame front, providing a complete dynamic analysis of flame propagation and combustion efficiency. Combining the wall cooling system and the chemiluminescence detection system, the experimental conditions can be controlled and analyzed more accurately, providing a powerful tool for the study of the free propagation of hydrogen flames under the action of sound waves.

[0034] like Figure 1 As shown, the measuring device of the free propagation flame of hydrogen burning under the action of sound waves mainly includes a constant volume combustion bomb 22, a sampling system, a wall cooling system, a chemiluminescence detection system and an acoustic system. The constant volume combustion bomb 22 includes a chamber 24, in which an ignition electrode 2 is installed for igniting fuel. The chamber 24 provides a closed space with a constant volume for simulating and controlling the combustion process.

[0035] The injection system provides fuel gas to the constant volume combustion bomb 22, including a gas cylinder 5, which is connected to the chamber 24 through a main pipeline 13 with a control valve. The control valve is used to adjust the gas flow entering the chamber 24. The wall cooling system controls the temperature of the wall of the chamber 24 to reduce the influence of the wall on the flame propagation and stability. The wall cooling system includes a cooling pipe 36, a cooling pump 38 and a temperature sensor 39. The cooling pipe 36 is coiled in the chamber 24, and a cooling medium (such as water or coolant) is circulated through the cooling pump 38. The temperature sensor 39 is installed in the chamber 24 to measure the temperature of the chamber 24 and send it to the controller to adjust the cooling effect. The chemiluminescence detection system measures the free radical concentration of the flame front by chemiluminescence, providing more accurate flame dynamic information. The chemiluminescence detection system is provided with a detection end, which is installed on a window opened on the side wall of the chamber 24. The detection end can collect images in the chamber 24 and send them to the controller for analysis by optical or electronic means. The acoustic system provides acoustic wave excitation to the chamber 24 and processes the acoustic wave information. The acoustic system is provided with a speaker 1, which is installed in the chamber 24 and connected to the controller. The speaker 1 is used to generate sound waves, and the controller is used to control the frequency, amplitude and other parameters of the sound waves.

[0036] like Figure 1 As shown, the chamber 24 of the constant volume incendiary bomb 22 can accommodate hydrogen with a certain pressure and equivalence ratio, the injection system provides hydrogen and combustion-supporting gas to the chamber 24 of the constant volume incendiary bomb 22, the ignition electrode 2 in the chamber 24 is used to ignite the hydrogen, and the acoustic system uses a speaker 1 as a sound wave generating device, which is used to provide sound wave excitation in the chamber 24 of the constant volume incendiary bomb 22 and process the sound wave information.

[0037] The wall cooling system is to spirally install the cooling pipe 36 along the inner wall of the chamber 24, and coolant flows in the cooling pipe 36 to ensure that the coolant evenly covers each area of ​​the chamber 24. The side wall of the chamber 24 of the constant volume combustion bomb 22 is fixed with two opposite flanges, and a transparent plate is installed to form a window, one of which is a first window 4, which is used to cooperate with the detection end of the chemiluminescence detection system, and the other window is a second window 3, which is used for observation. The transparent plate can be made of quartz glass with high light transmittance to allow the chemiluminescence detection system to non-destructively observe the chemiluminescence in the flame. A high-temperature sealing design is used between the window and the chamber 24 to prevent leakage of combustion products and ensure optical stability under high temperature environment.

[0038] A flange is installed on the top and bottom surfaces of the chamber 24 . The top surface of the chamber 24 is a first flange 25 for mounting the loudspeaker 1 of the acoustic system, and the bottom surface of the chamber 24 is a second flange 26 for mounting the ignition electrode 2 .

[0039] like Figure 1As shown, the sampling system also includes a vaporizer 7 and a vacuum pump 9. The gas cylinder 5 is connected to the main line 13 through a first pipeline 10. The vaporizer 7 is connected to the main line 13 through a second pipeline 11 and is connected to a liquid sampling pump 6. The vacuum pump 9 is connected to the main line 13 through a third pipeline 12. The main line 13 is also provided with a temperature control system 18 and a pressure detection unit 8.

[0040] Specifically, the sampling system is responsible for accurately and stably introducing the sample into the chamber 24. The gas cylinder 5 is used as a gas source and is connected to the main pipeline 13 through the first pipeline 10. A first valve 14 is provided on the first pipeline 10 to control the flow of gas. The vaporizer 7 is used to vaporize the liquid sample for subsequent analysis or reaction. The vaporizer 7 is connected to the main pipeline 13 through the second pipeline 11, and is connected to a liquid sampling pump 6 for accurately controlling the injection amount of the liquid sample. A second valve 15 is provided on the second pipeline 11 to control the flow of the liquid sample. The vacuum pump 9 is connected to the main pipeline 13 through the third pipeline 12 to adjust the pressure in the system to ensure the pressure environment required for the experiment or detection. A third valve 16 is provided on the third pipeline 12 to control the opening and closing of the vacuum pump 9. The main pipeline 13 is a channel connecting various components and is responsible for introducing gas or vaporized liquid samples into the analysis system or reaction chamber 24. The control valve is located on the main pipeline 13 as a fourth valve 17 to control the opening and closing of the entire sampling system.

[0041] During operation, according to the experimental requirements, select the appropriate gas cylinder 5 or liquid sample, and prepare the corresponding vaporizer 7 and sampling pump. Open the fourth valve 17, start the liquid sampling pump 6, and send the liquid sample into the vaporizer 7 for vaporization. At the same time, start the temperature control system 18 to adjust the temperature of the heating unit to the required value. Open the first valve 14 (if using a gas sample) or the second valve 15 (if using a vaporized liquid sample) to allow the sample to enter the main line 13. At the same time, start the vacuum pump 9 and adjust the pressure in the system to the required value through the third pipeline 12. When the sample reaches the required temperature and pressure in the main line 13, the controller will control the opening of the fourth valve 17 to introduce the sample into the chamber 24.

[0042] During the entire sampling process, the temperature control system 18 and the pressure detection unit 8 monitor the temperature of the sample and the pressure in the chamber 24 in real time and send the data to the controller. The controller adjusts the sample temperature and the working state of the vacuum pump 9 according to the monitoring data to ensure the stability and accuracy of the experimental conditions.

[0043] like Figure 1As shown, the temperature control system 18 includes a temperature control module 37, a first heating unit and a second heating unit. The temperature control module 37 is also connected to a temperature sensor 39 to assist the operation of the wall cooling system. The first heating unit is installed on the main line 13 and the first pipeline 10, the second pipeline 11, and the third pipeline 12 connected to the main line 13, and is used to heat the gas or liquid sample to ensure that it reaches the required temperature before entering the chamber 24. The second heating unit is installed in the chamber 24, and is used to heat the chamber 24, and is combined with the wall cooling system to jointly control the temperature of the chamber 24 to meet the requirements. The temperature control module 37 is connected to the controller, receives the control instructions of the controller, and is used to monitor and adjust the temperature of the heating unit in real time. Both the first heating unit and the second heating unit can use electromagnetic heating elements or heating wires.

[0044] The temperature control system 18 can adjust the temperature of the constant volume combustion bomb 22 and the pipeline so that it is maintained at the set temperature within the allowable error range. In order to conduct experimental research on liquid fuel, the temperature control system 18 is required to adjust the combustion bomb and the pipeline system to a temperature that makes the saturated vapor pressure of the fuel higher than the required fuel partial pressure. The liquid fuel is controlled by the liquid sampling pump 6 to enter the gasification tank 7 for gasification, and then passed into the combustion bomb for gas distribution.

[0045] The pressure detection unit 8 measures the pressure in the chamber 24 and sends the data to the controller. The controller adjusts the working state of the vacuum pump 9 according to the pressure data to ensure the stability of the pressure in the chamber 24. The pressure detection unit 8 can be a pressure sensor, a piezoelectric module, etc., which can measure the required pressure value and send it to the controller.

[0046] Specifically, the pressure detection unit 8 can monitor the pressure inside the chamber 24 of the constant volume combustion bomb 22 in real time. During the experiment, it is necessary to configure a combustible mixed gas of a certain equivalence ratio. Through the molecular formula of the studied fuel and the equivalence ratio of the required combustible mixed gas, the ratio of the mole fraction of hydrogen fuel and air can be calculated. Since the pressure of the combustible mixed gas required for the experiment is known, under the initial pressure and temperature conditions required by the experiment, both hydrogen and air can be processed according to ideal gas. Therefore, according to Dalton's law of partial pressures, the respective partial pressures of hydrogen and air can be obtained by the mole fraction ratio of hydrogen to air. During gas distribution, the pressure inside the chamber 24 of the constant volume combustion bomb 22 is monitored by the pressure detection unit 8, and the combustible mixed gas of the required equivalence ratio can be distributed. The pressure detection unit 8 can be realized by a commonly used pressure sensor device.

[0047] By precisely controlling the working states of the liquid sample pump 6, the heating unit and the vacuum pump 9, the sample injection system can achieve high-precision sample processing and stable experimental conditions. The sample injection system can not only process gas samples, such as the required hydrogen, combustion-supporting gas, etc., but also process liquid samples through the gasification tank 7, broadening the scope of application of the system. By real-time monitoring and adjustment of the temperature of the heating unit and the working state of the vacuum pump 9 by the controller, intelligent control is achieved, and the automation and efficiency of the experiment are improved.

[0048] The ignition electrode 2 is a component in the sample injection system for igniting gas or vaporized liquid samples. It consists of an electrode head and a trigger. The ignition electrode 2 is connected to a power source to generate an arc or spark to ignite the sample. The trigger is connected to a controller to receive a control signal and trigger an ignition action. The ignition electrode 2, the power source, and the trigger together constitute an ignition system 23.

[0049] The electrode head is made of high temperature resistant and corrosion resistant materials to ensure that it will not be damaged when igniting the sample. The shape and size of the electrode head may vary according to the experimental needs to optimize the ignition effect and stability. The trigger is an electronic component that receives a control signal from the controller. When the controller issues an ignition command, the trigger responds quickly and activates the electrode head to generate an arc or spark to ignite the sample. The introduction of the ignition electrode 2 solves the problem of needing to ignite the sample in the injection system for subsequent chemical reactions or analysis. By precisely controlling the trigger timing and ignition energy of the ignition electrode 2, it can be ensured that the sample is ignited at the predetermined time and conditions, thereby improving the accuracy and stability of the experiment.

[0050] The cooling pipe 36 is a component used to reduce the temperature of the chamber 24. It is usually arranged around the chamber 24 and removes heat by circulating a cooling medium (such as water, coolant or air). In order to more accurately control the temperature distribution of the chamber 24, the range of action of the cooling pipe 36 is divided into multiple cooling zones, each cooling zone corresponds to an independent cooling pipe 36. At the same time, multiple temperature sensors 39 are installed in the chamber 24, corresponding to the multiple cooling zones, for real-time monitoring of the temperature of each cooling zone.

[0051] In this embodiment, the cooling pipe 36 is usually made of high temperature resistant and corrosion resistant materials to ensure that it will not be damaged in a long-term high temperature environment. It uses copper alloy or stainless steel, and the coolant uses ethylene glycol-water solution. Each cooling zone corresponds to an independent cooling pipe 36, and the operating state of each cooling pipe 36 can be controlled by the controller, such as opening, closing or adjusting the flow of the cooling medium.

[0052] The temperature sensor 39 can sense and measure the temperature. In the chamber 24, multiple temperature sensors 39 are respectively installed near each cooling zone to monitor the temperature of each cooling zone in real time. The data of the temperature sensor 39 will be sent to the controller so that the experimenter can adjust it as needed. The cooling pipe 36 and the temperature sensor 39 solve the problem of accurately controlling the temperature of the chamber 24 in the injection system. By dividing multiple cooling zones and controlling the operating status of each cooling pipe 36 respectively, and monitoring the temperature of each cooling zone in real time through the temperature sensor 39, the flow rate and temperature of the coolant are adjusted according to the feedback of the temperature sensor 39. In order to meet the regulation of the coolant flow rate, a fifth valve 42 is also provided on the pipeline where the cooling pipe 36 is connected to the cooling pump 38 to control the pipeline flow.

[0053] The chemiluminescence detection system is an instrument for detecting chemiluminescence generated during a chemical reaction. In the sample injection system, the detection end of the chemiluminescence detection system is usually coaxially arranged with the chamber 24 to ensure that the detected chemiluminescence signal comes from the chemical reaction area in the chamber 24. The detection end is the core component of the chemiluminescence detection system, which usually includes a highly sensitive photodetector. In this embodiment, a photomultiplier tube 40 is used to capture the chemiluminescence signal generated during a chemical reaction. The detection end is coaxially arranged with the chamber 24 to ensure that the detected signal comes from the chemical reaction area in the chamber 24, thereby improving the accuracy and sensitivity of the detection.

[0054] The photomultiplier tube 40 and the filter combination are installed at the end of the optical path of the chemiluminescence detection system to detect extremely low-intensity free radical signals. A narrow-band filter is arranged in the optical path to select specific band signals (such as 310nm for OH* and 431nm for CH*) to ensure that the detector receives the luminescent signal of the target free radical. The chemiluminescence detection system also includes a high-speed camera 20 for capturing transient processes of flame propagation, such as flashback and extinguishing. It can share part of the optical path with the photomultiplier tube 40, and the shared optical path part is provided with a lens 28 and an aperture 30, and multi-point synchronous measurement is achieved through a spectroscope.

[0055] In the free flame propagation, the chemiluminescence method can accurately capture the flame propagation speed by monitoring the luminescence front of the OH* or CH* free radical. Combined with the high-speed camera 20, the transient propagation speed measurement under high time resolution can be achieved. The constant volume combustion bomb 22, the aperture 30 and the high-speed camera 20 are coaxially arranged in sequence. The aperture 30 is arranged at the focus of the lens 28. The chemiluminescence detection system can also be implemented using other components known in the art. The signal processing unit is used to receive the chemiluminescence signal captured by the detection end, and amplify, filter and digitally process it for subsequent data analysis and processing.

[0056] The introduction of the chemiluminescence detection system solves the problem of needing to detect the chemiluminescence signal generated during the chemical reaction in the injection system. Through the highly sensitive photoelectric detector and signal processing unit, the chemiluminescence signal generated during the chemical reaction can be captured and analyzed in real time, thereby providing important information about the chemical reaction process.

[0057] The acoustic system includes a speaker 1 and a protection unit, and a metal mesh is provided on the outside of the speaker 1. The side wall of the speaker 1 uses a metal sleeve to wrap the internal electronic and circuit components of the speaker 1, leaving only the diaphragm that vibrates and produces sound exposed. Its high specific heat capacity ensures that the inside of the speaker 1 will not be heated and damaged by the surrounding high-temperature gas, and can protect the speaker 1. When the flame spreads to the vicinity of the speaker 1, the metal mesh can quench the flame, thereby ensuring that the speaker 1 will not be directly burned by the high-temperature flame.

[0058] The controller in this embodiment can be a computer system 21. The computer system 21 enables the speaker 1 to emit sound waves of different frequencies, and further processes the image information obtained by the chemiluminescence detection system and the sound wave information of the acoustic system, thereby obtaining the physical law of the sound wave affecting the free propagation of flames.

[0059] Example 2

[0060] In another typical embodiment of the present invention, Figure 1 As shown, a working method of a device for measuring a free propagation flame of hydrogen burning under the action of sound waves is provided, using the device for measuring a free propagation flame of hydrogen burning under the action of sound waves as in Example 1.

[0061] A working method of a device for measuring a free propagation flame of hydrogen combustion under the action of acoustic waves, comprising:

[0062] The premixed hydrogen and combustible gas are charged into the constant volume combustion bomb 22 through the sample injection system;

[0063] The controller controls the speaker 1 of the acoustic system to emit sound waves, keeps the chemiluminescence detection system in working state, and uses the wall cooling system to control the temperature in the chamber 24;

[0064] The hydrogen combustible gas in the chamber 24 of the constant volume combustion bomb 22 is ignited by the ignition electrode 2, and the chemiluminescence detection system obtains the transient process of flame propagation and monitors the luminescence front of free radicals, captures the flame propagation speed, and sends it to the controller for analysis.

[0065] After one experiment is finished, the residual gas in the chamber 24 is exhausted, and the premixed hydrogen combustible gas is refilled, and the temperature in the chamber 24 is adjusted by using the wall cooling system before the experiment is carried out again.

[0066] In this embodiment, the hydroxyl group of the hydrogen-blended fuel after combustion is more obvious in the optical instrument, and more intuitive observation results can be easily obtained in combination with the characteristics of hydrogen. The cooling system combined with the wall of the heat capacity combustion bomb can not only control the combustion reaction under safe reaction conditions, but more importantly, it can reflect the influence of different temperatures on the flame characteristics of hydrogen combustion under temperature control conditions. Considering that the gas turbine cavity environment simulated in the experiment is relatively complex, this embodiment maximizes the simulation of the real steam turbine combustion environment, which provides a more intuitive expression for the flame characteristics of hydrogen combustion in the gas turbine and the influence of the control variables of the combustion wall temperature environment.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for measuring a free propagation flame of hydrogen combustion under the action of acoustic waves, characterized in that: include: A constant volume incendiary bomb is provided with a chamber in which an ignition electrode is installed; A sample injection system, including a gas cylinder, which is connected to the chamber through a main pipe with a control valve; A wall cooling system, comprising a cooling pipe, a cooling pump and a temperature sensor, wherein the cooling pipe is coiled in the chamber and connected to the cooling pump, and the temperature sensor is installed in the chamber to measure the chamber temperature and send it to the controller; The chemiluminescence detection system is provided with a detection end, which is installed on a window opened on the side wall of the chamber to collect images in the chamber and send them to the controller; An acoustic system, including a speaker, is installed in the chamber and connected to a controller.

2. The device for measuring the free propagation flame of hydrogen combustion under the action of sonic waves as claimed in claim 1, characterized in that: The sampling system also includes a gasification tank and a vacuum pump. The gas cylinder is connected to the main line through a first pipeline, the gasification tank is connected to the main line through a second pipeline, and is connected to a liquid sampling pump. The vacuum pump is connected to the main line through a third pipeline. The main line is also provided with a temperature control system and a pressure detection unit.

3. The device for measuring the free propagation flame of hydrogen combustion under the action of sonic waves as claimed in claim 2, characterized in that: The first pipeline is provided with a first valve, the second pipeline is provided with a second valve, the third pipeline is provided with a third valve, the control valve is a fourth valve, and the pressure detection unit measures the pressure in the chamber and sends it to the controller.

4. The device for measuring the free propagation flame of hydrogen combustion under the action of sonic waves as claimed in claim 2 or 3, characterized in that: The temperature control system comprises a temperature control module, a first heating unit and a second heating unit. The first heating unit is installed on the main pipe and the pipe connected to the main pipe, the second heating unit is installed in the chamber, and the temperature control module is connected to the controller.

5. The device for measuring the free propagation flame of hydrogen combustion under the action of sonic waves as claimed in claim 1, characterized in that: The ignition electrode is connected to a power source, and a trigger of the ignition electrode is connected to a controller.

6. The device for measuring the free propagation flame of hydrogen combustion under the action of sonic waves as claimed in claim 1, characterized in that: The range in which the cooling pipe acts on the chamber is divided into a plurality of cooling zones, and the cooling pipe corresponding to each cooling zone is independently distributed to control the operation of the cooling pipe corresponding to the cooling zone respectively.

7. The device for measuring the free propagation flame of hydrogen combustion under the action of sonic waves as claimed in claim 6, characterized in that: A plurality of temperature sensors are installed in the chamber, respectively corresponding to the plurality of cooling zones.

8. The device for measuring the free propagation flame of hydrogen combustion under the action of sonic waves as claimed in claim 1, characterized in that: The detection end and the chamber of the chemiluminescence detection system are coaxially arranged.

9. A method for operating a device for measuring a free propagation flame of hydrogen combustion under the action of sound waves, using the device for measuring a free propagation flame of hydrogen combustion under the action of sound waves as claimed in any one of claims 1 to 8, characterized in that: include: The premixed hydrogen and combustible gas are charged into the constant volume combustion bomb through the injection system; The controller controls the speaker of the acoustic system to emit sound waves, keeps the chemiluminescence detection system in working state, and uses the wall cooling system to control the temperature in the chamber; The hydrogen combustible gas in the chamber of the constant volume combustion bomb is ignited by the ignition electrode. The chemiluminescence detection system obtains the transient process of flame propagation and monitors the luminescence front of free radicals, captures the flame propagation speed, and sends it to the controller for analysis.

10. The working method of the device for measuring the free propagation flame of hydrogen combustion under the action of sonic waves as claimed in claim 9, characterized in that: After an experiment is completed, the residual gas in the chamber is exhausted, and the premixed hydrogen combustible gas is refilled. The temperature in the chamber is adjusted using the wall cooling system before the experiment is carried out again.

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