Device and method for measuring burning rate of ignition component for thermal battery

Abstract

The invention discloses a device and a method for measuring the burning rate of an ignition component for a thermal battery, and relates to the technical field of thermal batteries, a measured ignition component is placed in a high-temperature-resistant closed shell with a transparent side cover plate, and a fixing plate is mounted to fix the measured component on the surface of an anti-ablation flat plate; the ignition part is located at one end edge of the tested sample; a heating or refrigerating assembly can be placed outside the shell for temperature control; the closed shell is provided with an air inlet valve and an air extraction valve to control the atmosphere and vacuum degree in the shell; placing a high-speed camera outside the cover plate, and fixing an electric welding black glass lens on the surface of the high-speed camera; during testing, the computer controls the programmable power supply to output ignition current to enable the ignition component to act, dazzling flame emitted by sample combustion is filtered and then recorded by the high-speed camera, a curve of sample combustion progress and time is obtained, and combustion speed data of the tested ignition component is finally obtained through data acquisition, processing and calculation of the computer.

Description

Technical Field

[0001] The invention belongs to the technical field of thermal batteries, and in particular relates to a burning rate measuring device and a measuring method for an ignition component of a thermal battery. Background Art

[0002] Thermal batteries are a type of primary storage battery that heats inorganic salt electrolytes that are non-conductive at room temperature to a molten state through its own ignition and heating system and begins to output electrical energy. Generally speaking, thermal batteries are usually composed of several groups of single cells connected in series and parallel to form a battery pack. At room temperature, there is no chemical reaction between the electrode material and the electrolyte in the battery, and the battery self-discharge is very small. When the battery is working, it is necessary to output a flame through a pyrotechnic to ignite the ignition component. The ignition component burns quickly and ignites the heating structure in each group of single cells, releasing heat and transferring it to the electrolyte to melt it into an ion conductor to achieve the purpose of external power supply. The activation time of a thermal battery is one of the most important performance indicators of the battery, and the burning speed of the ignition component and the heating component is an important basic data that needs to be paid attention to during the activation process of the thermal battery. The burning speed of the ignition component has a great influence on the activation time of the thermal battery. The traditional artificial ignition test method is easily affected by human factors and has poor safety. At present, there is no simple and convenient method reported to test the actual burning speed of the ignition component for thermal batteries under specified temperature, atmosphere, and pressure. Summary of the invention

[0003] In order to solve the technical problems existing in the known technology, the present invention provides a burning rate measuring device and a measuring method for an ignition component for a thermal battery. The device can accurately, conveniently and flexibly measure the burning rate of the ignition component for a thermal battery under specified temperature, air pressure, atmosphere and pressure, and is less affected by human factors and has a small detection error, thereby providing basic data support for material development and thermal battery design.

[0004] The present invention adopts the following technical scheme: a burning rate measuring device for an ignition component of a thermal battery, comprising a shell for placing a sample and a sensor and maintaining a closed state, the shell being composed of a side cover plate of a transparent material and a high-temperature resistant shell, an air intake valve and an air exhaust valve being connected to the high-temperature resistant shell, the air exhaust valve being connected to a vacuum pump, a pressure gauge being installed on a pipeline connecting the air exhaust valve and the shell, a mounting column being arranged on the inner side of a back plate of the high-temperature resistant shell, the sample to be tested together with an anti-ablation plate and a pressure sensor being fixed to the back plate of the high-temperature resistant shell by a fixing plate through the mounting column, an ignition assembly being placed on one side of the sample to be tested, the ignition assembly being connected to a programmable power supply and a computer for ignition operation, a temperature sensor being placed in the shell and being connected to a temperature controller together with a heating or cooling assembly installed outside the shell, a high-speed camera being placed outside the side cover plate, an electric welded black glass lens being fixed outside the lens of the high-speed camera, and the high-speed camera being connected to a computer through a data cable for collecting images of the test process.

[0005] The frame rate of the high-speed camera is above 240FPS.

[0006] The material of the high temperature resistant shell is one of stainless steel, copper, aluminum and aluminum alloy, titanium and titanium alloy, ceramic, and quartz material, and the material of the transparent high temperature resistant side cover is one of quartz, high borosilicate glass, sapphire glass, acrylic, and mica.

[0007] The high temperature resistant shell is processed with an annular groove at the connection with the transparent side cover plate, so as to facilitate the installation of an "O" type sealing ring.

[0008] The ignition assembly wire and the temperature sensor wire pass through the side wall of the high temperature resistant housing by glass sealing or installing a sealed joint.

[0009] The high-speed camera is fixed on a camera bracket, and the bracket has a telescopic function for adjusting the position of the high-speed camera and selecting a suitable field of view to achieve maximum resolution.

[0010] The fixing plate is customized according to the characteristics of the ignition component to be tested and the test requirements, and is a metal and transparent material structure combined flat plate, a metal hollow flat plate, a pure transparent material flat plate, a metal or non-metallic fixing strip, and uses reusable materials or disposable components; the fixing plate is connected to the mounting column on the back plate of the shell through studs, and the clamping force applied to the sample is controlled by adjusting the tightening force.

[0011] A method for measuring the burning rate of an ignition component for a thermal battery, using the above-mentioned device for measuring the burning rate of an ignition component for a thermal battery, comprises the following steps:

[0012] 1) Control the pressure and install the sample into the shell of the test device, cover the transparent side cover and adjust the valve and vacuum pump to achieve the required atmosphere and vacuum degree, set the temperature controller to the required temperature and wait for the temperature to stabilize;

[0013] 2) The computer obtains the sampling frequency of the high-speed camera and sets the shape and size information of the ignition component;

[0014] 3) The computer issues instructions under the user's operation to control the programmable power supply to output the ignition current, controls the ignition component to ignite the ignition component under test, and starts the high-speed camera to record at the same time;

[0015] 4) The computer acquires the high frame rate video captured by the high-speed camera, extracts frame-by-frame images, and screens effective images through image analysis software;

[0016] 5) The computer automatically or manually analyzes the combustion progress data of each frame of the image through image analysis software, and summarizes the burning rate data based on the frame rate and size information. The burning rate is equal to the length of the combustion position advancement within a certain period of time.

[0017] The advantages and positive effects of the present invention are: the present invention can achieve simple and fast separation from man and machine during the test process, avoiding safety issues when testing the burning rate of the ignition component for the thermal battery, accurately measuring the burning rate information of the ignition component for the thermal battery under specified temperature, air pressure, atmosphere, and pressure, and recording the combustion process, providing basic data for studying the generation mechanism of the gas inside the thermal battery and the simulation of the convection process, and providing data support for the development of thermal battery ignition materials and thermal battery activation design. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the present invention;

[0019] Figure 2 A side view of the test housing of the present invention;

[0020] Figure 3 1 is a diagram showing test results of an embodiment of the present invention.

[0021] Among them: 1. Computer; 2. High-speed camera; 3. Camera bracket; 4. Electric welding black glass lens; 5. Heating or cooling component; 6. High temperature resistant shell; 7. Pressure sensor; 8. Anti-ablation plate; 9. Ignition component for the thermal battery under test; 10. Fixing plate; 11. Mounting column; 12. Transparent side cover; 13. O-ring; 14. Lock; 15. Ignition component; 16. Programmable power supply; 17. Pressure display instrument; 18. Temperature sensor; 19. Temperature controller; 20. Inlet valve; 21. Pressure gauge; 22. Exhaust valve; 23. Vacuum pump; 24. Test base. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation methods described herein are only used to explain the present invention and are not used to limit the present invention.

[0023] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by terms such as “upper”, “middle”, “lower”, “inside”, “outside”, and “both sides” are based on the orientations or positional relationships shown in the accompanying drawings, and are only simplified descriptions for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] like Figure 1 , 2 As shown, the burning rate measuring device for the ignition component of the thermal battery of the present invention includes a shell for placing a sample and a sensor and maintaining a closed state, the shell is composed of a side cover plate 12 made of a transparent material and a high temperature resistant shell 6, an air intake valve 20 and an air extraction valve 22 are connected to the high temperature resistant shell 6, the air extraction valve 22 is connected to a vacuum pump 23, a pressure gauge 21 is installed on the pipeline connecting the air extraction valve 22 and the shell, a mounting column 11 is arranged on the inner side of the back plate of the high temperature resistant shell 6, the sample to be tested is fixed to the back plate of the high temperature resistant shell 6 together with the anti-ablation plate 8 and the pressure sensor 7 by the fixing plate 10 through the mounting column 11, an ignition component 15 is placed on one side of the sample, the ignition component 15 is connected to the programmable power supply 16 and the computer 1 for ignition operation, a temperature sensor 18 is placed in the shell and is connected to the temperature controller 19 together with the heating or cooling component 5 installed outside the shell, a high-speed camera 2 is placed outside the side cover plate 12, an electric welding black glass lens 4 is fixed outside the lens of the high-speed camera, and the high-speed camera 2 is connected to the computer 1 through a data line for collecting images of the test process.

[0026] The frame rate of the high-speed camera 2 is above 240 FPS.

[0027] The material of the high temperature resistant shell 6 is one of stainless steel, copper, aluminum and aluminum alloy, titanium and titanium alloy, ceramic, and quartz material, and the material of the transparent high temperature resistant side cover plate 12 is one of quartz, high borosilicate glass, sapphire glass, acrylic, and mica.

[0028] 4. The burning rate measuring device for the ignition component of a thermal battery according to claim 1 is characterized in that an annular groove is processed at the connection between the high temperature resistant shell 6 and the transparent side cover plate 12 to facilitate the installation of the "O" type sealing ring 13.

[0029] The wires of the ignition assembly 15 and the temperature sensor 18 pass through the side wall of the high temperature resistant housing 6 by means of glass sealing or installing a sealed joint.

[0030] The high-speed camera 2 is fixed on a camera bracket 3, and the bracket has a telescopic function for adjusting the position of the high-speed camera and selecting a suitable field of view to achieve maximum resolution.

[0031] The fixing plate 10 is customized according to the characteristics of the ignition component to be tested and the test requirements, and is a metal and transparent material structure combined flat plate, a metal hollow flat plate, a pure transparent material flat plate, a metal or non-metallic fixing strip, and uses reusable materials or disposable components; the fixing plate is connected to the mounting column 11 on the back plate of the shell through studs, and the clamping force applied to the sample is controlled by adjusting the tightening force.

[0032] A method for measuring the burning rate of an ignition component for a thermal battery, using the above-mentioned ignition component burning rate measuring device for a thermal battery, is characterized in that it comprises the following steps:

[0033] 1) Control the pressure and install the sample into the shell of the test device, cover the transparent side cover and adjust the valve and vacuum pump to achieve the required atmosphere and vacuum degree, set the temperature controller to the required temperature and wait for the temperature to stabilize;

[0034] 2) The computer obtains the sampling frequency of the high-speed camera and sets the shape and size information of the ignition component;

[0035] 3) The computer issues instructions under the user's operation to control the programmable power supply to output the ignition current, controls the ignition component to ignite the ignition component under test, and starts the high-speed camera to record at the same time;

[0036] 4) The computer acquires the high frame rate video captured by the high-speed camera, extracts frame-by-frame images, and screens effective images through image analysis software;

[0037] 5) The computer automatically or manually analyzes the combustion progress data of each frame of the image through image analysis software, and summarizes the burning rate data based on the frame rate and size information. The burning rate is equal to the length of the combustion position advancement within a certain period of time.

[0038] Specifically, the burning rate measuring device of the ignition component for thermal battery of the present invention comprises a closed test shell composed of a high temperature resistant shell 6 and a transparent side cover plate 12 fixed on a test base 24 for a combustion test, wherein an annular groove is processed on the high temperature resistant shell 6, an O-ring 13 is installed, and fastened by a lock 14; an air intake valve 20, an air exhaust valve 22, and a pressure gauge 21 are processed and connected to the shell, and are connected to a vacuum pump 23 to control the internal atmosphere and vacuum degree; a mounting column 11 is processed on the back plate of the high temperature resistant shell 6, and a fixing plate 10 is connected to the mounting column 11 by a stud to fix the ignition component 9, the anti-ablation plate 8, and the pressure sensor 7 for the tested thermal battery in the high temperature resistant shell 6 at a specified pressure, and the pressure sensor 7 is connected to the high temperature resistant shell 6 by a wire. A pressure display instrument 17; an ignition assembly 15 is placed on one side of the ignition component 9 for the thermal battery to be tested, and the wire of the ignition assembly 15 is connected to the programmable power supply 16, and the programmable power supply 16 is connected to the computer 1 through a data line to realize remote control of the test start; a temperature sensor 18 is placed outside the fixed plate 10 and connected to the temperature controller 19 through a wire, and the temperature controller 19 is connected to the heating or cooling assembly 5 fixed outside the back plate of the high-temperature resistant shell 6 to achieve the purpose of controlling the test temperature; a high-speed camera 2 is installed on the camera bracket 3 at a designated position opposite to the transparent side cover plate 12, and a welded black glass lens 4 is installed on the lens surface of the high-speed camera 2. The high-speed camera 2 is connected to the computer 1 through a data line for collecting images of the test process.

[0039] The present invention is arranged through the above-mentioned structure. During the test, the operating computer 1 controls the programmable power supply 16 to output the ignition current to the ignition component 15. The ignition component outputs a flame to ignite the ignition component 9 for the thermal battery under test. The flame of the burning ignition component 9 for the thermal battery under test passes through the transparent side cover plate 12 and is filtered by the welding black glass lens 4 and then recorded by the high-speed camera 2.

[0040] The ignition assembly 15 of the present invention can output flame in a short time when the ignition current is passed. The flame is small and can only ignite the ignition component 9 for the thermal battery under test, and will not affect the combustion image recorded by the high-speed camera 2.

[0041] When the high temperature resistant shell 6 and the transparent side cover plate 12 in the present invention are assembled, an O-type sealing ring 13 is installed in the annular groove of the high temperature resistant shell 6, and high vacuum silicone grease is applied to the surface of the O-type sealing ring 13, and the locking buckle 14 is fastened to ensure that the contact surface is leak-proof. The high temperature resistant shell 6 is processed and connected with an air inlet valve 20, a pressure gauge 21, and an air extraction valve 22. The air inlet valve 20 can be connected to a gas cylinder for gas supply, and the pressure gauge 21 is used to indicate the internal pressure of the test shell. The air extraction valve 22 can be connected to a vacuum pump 23 when a certain vacuum degree is required to adjust the vacuum degree in the shell. When replacing the atmosphere, the air inlet valve 20 is closed, the vacuum pump 23 is opened, and the air extraction valve 22 is opened to start vacuuming. When the pressure gauge 21 shows close to -0.1MPa and does not move, the air extraction valve 22 and the vacuum pump 23 are closed, and the air inlet valve 20 connected to the gas cylinder is opened to start gas supply. When the pressure gauge 21 shows close to normal pressure, the air inlet valve 20 is closed, and the vacuum pump 23 and the air extraction valve 22 are opened to vacuum again. After repeating this three times, it can be considered that the replacement is completed.

[0042] The test temperature in the present invention can be set to -40°C ~ +85°C, which is achieved by setting the temperature controller 19 to control the heating or cooling component 5. The heating or cooling component 5 refers to a heating component installed when heating is required. The heating component heats up the test high-temperature resistant shell 6, and the temperature sensor 18 collects temperature data and transmits it back to the temperature controller 19 to form a closed-loop control; when cooling is required, a high-efficiency refrigeration component is installed at the position of the heating or cooling component 5, and the refrigeration plate creates a low-temperature environment through the high-temperature resistant shell 6. The temperature sensor 18 is also used to collect temperature data and transmit it back to the temperature controller 19 to form a closed-loop control.

[0043] The execution of the test of the present invention and the post-processing of the data acquisition by the computer include the following steps:

[0044] 1) Control the pressure: Install the ignition component 9 for the thermal battery to be tested into the test high temperature resistant shell 6, cover the transparent side cover 12 and adjust the air inlet valve 20, air exhaust valve 22 and vacuum pump 23 to achieve the required atmosphere and vacuum degree, set the temperature controller 19 to the required temperature and wait for the temperature to stabilize.

[0045] 2) The computer 1 obtains the sampling frequency of the high-speed camera 2 and sets the shape and size information of the ignition component 9 for the thermal battery to be tested.

[0046] 3) The computer 1 issues instructions under the user's operation to control the programmable power supply 16 to output the ignition current, controls the ignition assembly 15 to ignite the ignition component 9 for the thermal battery under test, and starts the high-speed camera 2 to record the video.

[0047] 4) The computer 1 obtains the high frame rate video captured by the high-speed camera 2, extracts frame-by-frame images, and screens effective images through image analysis software.

[0048] 5) The computer 1 automatically or manually analyzes the combustion progress data of each frame of the image through image analysis software, and summarizes and calculates the burning speed data in combination with the frame rate and size information. The burning speed is equal to the length of the combustion position advancement within a certain period of time.

[0049] The high-speed camera 2 communicates with the computer 1 via a data line using a set protocol, and can transmit information such as the frame rate of the high-speed camera 2 and the shooting time of each frame in real time. The image analysis software on the computer 1 can filter effective images through brightness information, and can automatically or manually analyze the combustion progress of each frame of the image. Combined with the sample size and the corresponding pixel relationship data, the burning rate information can be automatically calculated. The burning rate is equal to the length of the combustion position advancement within a certain time difference.

[0050] The specifications of the welding black glass lens 4 are adjusted according to the composition and combustion brightness of the ignition assembly 9 for the thermal battery to be tested, and the adjustment is based on the collected combustion image being moderately bright and clear.

[0051] The welded black glass lens 4 fixed in front of the high-speed camera lens is used to remove stray light, so that the combustion image captured by the high-speed camera has moderate brightness, is clear and has no ghosting. The high-speed camera is fixed on a camera bracket, and the bracket has a telescopic function, which can be used to adjust the position of the high-speed camera and select a suitable field of view to achieve maximum resolution.

[0052] The air inlet valve, air exhaust valve, pressure gauge and vacuum pump connected to the shell together constitute an atmosphere vacuum control system. When it is necessary to control the atmosphere, the air inlet valve pipeline is connected to the gas cylinder or other gas supply pipeline, the air inlet valve is closed, and the air exhaust valve and the vacuum pump are opened to perform vacuum extraction. After the vacuum extraction is completed, the air exhaust valve and the vacuum pump are closed, and the air inlet valve is opened to start gas supply. At the same time, the pressure gauge is observed to inflate to the required pressure, and finally the air inlet valve is closed to complete the gas replacement. When it is necessary to control the vacuum degree, the air inlet valve is closed, the air exhaust valve and the vacuum pump are opened, and when the pressure gauge displays the set vacuum degree, the air exhaust valve and the vacuum pump are closed to complete the vacuum extraction.

[0053] The present invention fixes the ignition component of the tested thermal battery in a transparent shell of a side cover plate, controls the pressing pressure through a fixing plate and a pressure sensor, controls the atmosphere and pressure in the shell through an air intake valve, an air extraction valve, a pressure gauge and a vacuum pump, controls the test temperature through a heating or cooling component and a temperature sensor, uses a computer to control a programmable power supply to enable an ignition component to ignite the tested ignition component, and the dazzling flames emitted by the combustion are filtered by a welding black glass lens, received by a high-speed camera and transmitted to a computer for analysis to obtain burning rate information.

[0054] like Figure 3 The image data shown is the image data collected by the computer 1 and transmitted by the high-speed camera 2 and processed by the image analysis software. The frame rate of the high-speed camera is 1000FPS, and the interval between each frame is 0.001s. Figure 3The time interval between the two pictures is 0.037s, the combustion progress advances 43.2mm, and the calculated combustion speed is 43.2mm / 0.037s=1167.6mm / s=116.76cm / s.

[0055] The embodiments of the present invention are described in detail above, but the contents are only embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A burning rate measuring device for an ignition component of a thermal battery, characterized in that: The invention comprises a closed housing for placing a sample and a sensor, the housing comprising a side cover plate (12) made of a transparent material and a high temperature resistant housing (6), an air inlet valve (20) and an air extraction valve (22) are connected to the high temperature resistant housing (6), the air extraction valve (22) is connected to a vacuum pump (23), a pressure gauge (21) is installed on the pipeline connecting the air extraction valve (22) and the housing, a mounting column (11) is arranged on the inner side of the back plate of the high temperature resistant housing (6), and the sample to be tested, the anti-ablation plate (8) and the pressure sensor (7) are fixed by a fixing plate (10) through the mounting column (11). The device is fixed on the back plate of the high temperature resistant shell (6), an ignition assembly (15) is placed on one side of the sample to be tested, the ignition assembly (15) is connected to a programmable power supply (16) and a computer (1) to perform an ignition operation, a temperature sensor (18) is placed in the shell and is connected to a temperature controller (19) together with a heating or cooling assembly (5) installed outside the shell, a high-speed camera (2) is placed outside the side cover (12), a welded black glass lens (4) is fixed outside the lens of the high-speed camera, and the high-speed camera (2) is connected to the computer (1) via a data cable to collect images of the test process.

2. The burning rate measuring device for the ignition component of the thermal battery according to claim 1, characterized in that: The frame rate of the high-speed camera (2) is above 240 FPS.

3. The burning rate measuring device for the ignition component of the thermal battery according to claim 1, characterized in that: The material of the high temperature resistant shell (6) is one of stainless steel, copper, aluminum and aluminum alloy, titanium and titanium alloy, ceramic, and quartz material, and the material of the transparent high temperature resistant side cover plate (12) is one of quartz, high borosilicate glass, sapphire glass, acrylic, and mica.

4. The burning rate measuring device for the ignition component of the thermal battery according to claim 1, characterized in that: The high temperature resistant shell (6) is machined with an annular groove at the connection with the transparent side cover plate (12) to facilitate the installation of an "O" type sealing ring (13).

5. The burning rate measuring device for the ignition component of the thermal battery according to claim 1, characterized in that: The ignition assembly (15) wire and the temperature sensor (18) wire pass through the side wall of the high temperature resistant housing (6) by means of glass sealing or installing a sealed joint.

6. The burning rate measuring device for the ignition component of the thermal battery according to claim 1, characterized in that: The high-speed camera (2) is fixed on a camera bracket (3), and the bracket has a telescopic function for adjusting the position of the high-speed camera and selecting a suitable field of view to achieve maximum resolution.

7. The burning rate measuring device for the ignition component of the thermal battery according to claim 1, characterized in that: The fixing plate (10) is customized according to the characteristics of the ignition component to be tested and the test requirements, and is a metal and transparent material structure combined flat plate, a metal hollow flat plate, a pure transparent material flat plate, a metal or non-metal fixing strip, and uses reusable materials or disposable components; the fixing plate is connected to the mounting column (11) on the back plate of the shell through a stud, and the pressing force applied to the sample is controlled by adjusting the tightening force.

8. A method for measuring the burning rate of an ignition component for a thermal battery, using the burning rate measuring device for an ignition component for a thermal battery according to any one of claims 1 to 7, characterized in that: The steps include: 1) Control the pressure and install the sample into the shell of the test device, cover the transparent side cover and adjust the valve and vacuum pump to achieve the required atmosphere and vacuum degree, set the temperature controller to the required temperature and wait for the temperature to stabilize; 2) The computer obtains the sampling frequency of the high-speed camera and sets the shape and size information of the ignition component; 3) The computer issues instructions under the user's operation to control the programmable power supply to output the ignition current, controls the ignition component to ignite the ignition component under test, and starts the high-speed camera to record at the same time; 4) The computer acquires the high frame rate video captured by the high-speed camera, extracts frame-by-frame images, and screens effective images through image analysis software; 5) The computer automatically or manually analyzes the combustion progress data of each frame of the image through image analysis software, and summarizes the burning rate data based on the frame rate and size information. The burning rate is equal to the length of the combustion position advancement within a certain period of time.

Images