Visual measurement device for combustion process of electronic control solid propellant and measurement method thereof

Abstract

The invention discloses a visual measurement device and method for the combustion process of an electronic control solid propellant. The measurement device comprises a grain sample, a power source, a control system, a high-speed camera, a constant-volume combustion bomb, a temperature controller and a gas supply system. The constant-volume combustion bomb comprises a heating element, a combustion chamber and an integrated seat, and the high-speed camera directly faces the visual window; the integrated seat comprises an adapter and an electrode assembly, the electrode assembly comprises an electrode column, an electrode clamping plate and an electrode slice, the electrode slice is attached to the side face of a grain sample, the grain sample is located in an electrode slice excitation area and comprises a medicine core and an insulating layer, and the lower end of the medicine core is an initial combustion section; according to the measuring device, the image technology and the controllable environment cavity are fused, the burning rate of the solid propellant under various working conditions is collected, the burning rate and related burning parameters can be accurately measured without interference under various set working conditions through a grain sample special for non-contact measurement and an exciting electrode assembly, and the measuring method can achieve synchronous triggering collection of multiple physical quantities, so that the measuring efficiency is improved. And the multi-physical coupling combustion characteristics of the propellant can be conveniently analyzed.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel combustion characteristic testing, and in particular to a visual measurement device and a measurement method for an electronically controlled solid propellant combustion process. Background Art

[0002] The burning rate of an electronically controlled solid propellant refers to the distance along the normal direction of the solid propellant's burning surface that the solid phase disappears per unit time. Electronically controlled solid propellants achieve adjustable ignition and burning rate control by adjusting the applied voltage or current. They have the advantages of compact structure, rapid response, and easy regulation. In the research of propellant formulations and the design of ignition control strategies, accurately obtaining their burning rate data under different electrical excitation and boundary conditions is the key foundation.

[0003] Currently, propellant burning rate measurement experiments primarily rely on contact-based methods such as the target wire method. This method requires pre-installed fusible wires in the propellant sample and calculates the burning rate based on the changes in the electrical signal caused by the propellant combustion. This method has significant drawbacks: First, the target wire implantation damages the propellant structure, affecting its natural combustion process; second, the inherent electrical conductivity of electronically controlled solid propellants can easily interfere with electrical signal acquisition, affecting the accuracy of burning rate determination; and due to the limitations of the electronically controlled fixed propellant structure, non-contact measurement is not possible.

[0004] In order to overcome the errors caused by contact testing, existing technologies have proposed non-contact image recording methods. For example, some public patents use high-speed video to record the propellant combustion process, and judge the time point when the combustion light passes through a specific small hole based on the image brightness (RGB value reaches a certain threshold), and then calculate the propellant burning rate based on this. Although this method avoids physical contact, it still has the following problems: First, this method uses a specific small hole as a reference distance and calculates the burning rate based on the combustion time passing through this distance. Its test accuracy is low, and it is impossible to achieve continuous and interference-free measurement of the combustion process; second, this type of solution fails to achieve synchronous acquisition with electrical parameters such as current and voltage, and lacks the ability to control environmental boundaries (pressure, temperature, etc.), making it difficult to meet the needs of systematic research on propellant combustion behavior under complex working conditions. Summary of the Invention

[0005] The purpose of the present invention is to overcome the defects in the prior art and provide a visual measurement device for the electronically controlled solid propellant combustion process, so as to overcome one or more problems caused by the limitations and defects of the relevant technology to a certain extent.

[0006] In order to achieve the above object, the technical solution of the present invention is as follows:

[0007] A visual measurement device for the combustion process of an electrically controlled solid propellant includes a dedicated grain sample, a power supply, a control system, a high-speed camera, a constant-volume incendiary bomb, a temperature controller, and an air supply system. The constant-volume incendiary bomb includes a heating element, a combustion chamber, and an integrated seat. The air supply system is connected to the combustion chamber. The heating element is located in the combustion chamber and is connected to the temperature controller. At least one visual window is provided on the side wall of the combustion chamber, and the high-speed camera is directly opposite the visual window.

[0008] The drug column sample is a square column structure, which is clamped on the integrated seat and along the vertical direction. The integrated seat includes an adapter and an electrode assembly. The electrode assembly is assembled on the adapter. The adapter is detachable and plugged into the upper port of the combustion chamber. The electrode assembly includes an electrode column, an electrode clamp and an electrode sheet. The electrode clamp is installed on the adapter. The two electrode sheets are respectively attached to the two opposite sides of the drug column sample and are arranged along the combustion direction of the drug column sample. The two electrode clamps are respectively located on the outside of the two electrode sheets and are used to apply relative clamping force to the two electrode sheets to clamp the drug column sample. The two electrode plates are respectively connected to the positive and negative poles of the power supply through the electrode column.

[0009] At least the lower section of the powder sample is located within the observation range of the visual window, and any of the other two opposite sides of the powder sample is directly opposite the visual window. The powder sample is located within the excitation area of ​​the two electrode sheets. The powder sample includes an inner powder core and an outer insulating layer. The lower end of the powder core extends out of the insulating layer to form an exposed initial combustion section.

[0010] Furthermore, the control system includes a host computer, an electronically controlled switch, a synchronous trigger and an electrical signal collector. The electronically controlled switch controls the current on and off of the electrode column. The host computer is electrically connected to the high-speed camera, the electronically controlled switch and the electrical signal collector through the synchronous trigger, and is used to synchronously send trigger signals to the high-speed camera, the electronically controlled switch and the electrical signal collector.

[0011] Furthermore, the insulating layer of the powder column sample is a Teflon film that decomposes when heated. The Teflon film is wrapped around the outside of the powder core and is used to gradually retreat axially as the burning surface advances to expose the conductive part of the powder core.

[0012] Furthermore, one electrode clamp is fixed to the adapter via a fixing block, and the other electrode clamp is fixedly connected to the adapter via an elastic support member, so as to form a clamping space with variable transverse elasticity between the two electrode clamps.

[0013] Furthermore, vertical positioning grooves are provided on both electrode clamps, which pass through the lower ends of the electrode clamps. Corresponding positioning protrusions are provided on the electrode sheets. The width of the electrode sheets is consistent with the width of the drug column sample, and the sides of the two are aligned. The positioning protrusions are plugged into the vertical positioning grooves for vertical positioning of the drug column sample.

[0014] A visual measurement method for an electronically controlled solid propellant combustion process comprises the following steps:

[0015] S1. Preparation of drug column samples;

[0016] a. Set a forming groove on the mold and mark the no-film line on the forming groove. Clean the forming groove and lay Teflon film. One end of the Teflon film should be flush with one end of the forming groove and the other end should be flush with the no-film line.

[0017] b. Under set temperature conditions, stir and mix the components of the raw material formula in a mixing container, and perform vacuum degassing on the propellant slurry under a vacuum environment to eliminate bubbles therein to obtain a propellant slurry;

[0018] c. Slowly inject the degassed propellant slurry into the forming tank until it is full. Cut the Teflon film on both sides of the forming tank to leave enough film width to wrap the core.

[0019] d. Place the mold filled with propellant slurry in a temperature-controlled box, set the curing time, temperature and humidity in the box, dry and solidify the propellant slurry into shape, stretch and wrap the reserved Teflon film to obtain the final grain sample;

[0020] e. Mark the sample number of the grain sample and inspect its quality. The dimensions and electrical properties of the grain sample that meets the quality standards shall be measured and recorded;

[0021] S2. Install the drug sample; the electrode sheets are attached to the two opposing forming surfaces of the drug sample, which are the two opposing sides in contact with the side walls of the forming groove, so that the drug sample is completely placed in the excitation area between the two electrode sheets. The drug sample and the electrode sheets are clamped and placed together between the two electrode clamps, and the drug sample is clamped to ensure that the drug is in a vertical position.

[0022] S3. Generate a measurement environment: Install the integrated base into the upper port of the combustion chamber and seal the connection. Set the temperature control temperature and the gas supply system to preset the gas supply pressure. Input high-pressure gas into the combustion chamber. The heating element heats the high-pressure gas in the combustion chamber to generate a measurement environment for the specified parameter.

[0023] S4. Burning rate measurement. The host computer sends a trigger signal to the high-speed camera, the electric control switch and the electrical signal collector through a synchronous trigger. The three are started synchronously and have the same time phase. The electrode is energized to ignite the initial combustion segment at the lower end of the propellant sample. At the same time, the electrical signal collector synchronously collects the voltage signal and current signal in the electrode assembly, and the high-speed camera synchronously collects the image of the propellant sample in the combustion chamber and sends them all to the host computer. The image data is analyzed and calculated to obtain the burning rate of the propellant sample under the corresponding excitation conditions.

[0024] Compared with the prior art, the visual measurement device and method for the electronically controlled solid propellant combustion process of the present invention have the following beneficial effects:

[0025] This measurement device combines image processing-assisted non-contact measurement technology with a controlled environment chamber design to simulate high-pressure, high-temperature, and electrical excitation conditions to test the burning rate of electronically controlled solid propellants. A dedicated grain sample and excitation electrode assembly for non-contact measurement are designed to enable accurate, non-interference measurement of the burning rate and related combustion parameters of electronically controlled solid propellants under various set conditions. This measurement device avoids sample structure damage and measurement errors caused by traditional target line methods and crude luminescence threshold methods, thereby improving the accuracy and reliability of burning rate measurements.

[0026] The outer layer of the grain sample is wrapped with an insulating layer, which is clamped in contact with the electrode sheet to avoid the risk of electrical breakdown. Since the electrode sheet maintains non-direct contact with the burning surface of the core, it effectively avoids the interference of the electrode on the burning surface temperature field and the combustion characteristics of the propellant, ensuring the authenticity and repeatability of the experimental data. The initial combustion section is preset at the lower end of the grain sample to control the initial burning surface. As the burning surface advances, the insulating layer retreats axially to avoid interfering with the advancement of the burning surface, and continuously and orderly exposes the core to form new conductive parts, which is conducive to orderly promotion of the stimulated combustion.

[0027] This measurement method can realize multi-condition combustion simulation of propellants and perform synchronous triggering and acquisition of multiple physical quantities, which is conducive to unifying the time base of current, voltage, image and other signals, and facilitates in-depth analysis of the multi-physical coupled combustion characteristics of propellants under electrical excitation; the molding method of the grain sample can realize the integrated molding of the core and Teflon insulating film, which simplifies the process flow, improves the consistency and reliability of the grain sample molding, and effectively improves the insulation performance of the grain sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the measuring device disclosed in the present invention;

[0029] Figure 2 for Figure 1 Schematic diagram of the structure of the aptamer;

[0030] Figure 3 for Figure 2 A partial enlarged view of point I in the middle;

[0031] Figure 4 The present invention is a flow chart of the measurement method disclosed in the present invention.

[0032] In the figure: 1. Host computer; 2. Synchronous trigger; 3. Electric control switch; 4. Electrical signal collector; 5. Power supply; 6. Integrated seat; 61. Adapter; 62. Electrode column; 63. Fixed block; 64. Fixed electrode clamp; 65. Movable electrode clamp; 66. Elastic support; 67. Cartridge sample; 67a. Cartridge core; 67b. Electrode sheet; 67c. Insulation layer; 7. Constant volume combustion bomb; 71. Heating element; 72. Visual window; 73. Combustion chamber; 8. High-speed camera; 9. Temperature controller; 10. High-pressure gas source; 11. Gas supply system; L, length of initial combustion section. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only the best embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] Based on the non-contact measurement technology, this embodiment provides a visual measurement device for the combustion process of an electronically controlled solid propellant. Figure 1-Figure 3 As shown, it includes a dedicated measurement charge sample 67, a power supply 5, a control system, a high-speed camera 8, a constant volume combustion bomb 7, a temperature controller 9 and a gas supply system 11;

[0035] The gas supply system 11 includes a high-pressure gas source 10, a gas supply branch, and an exhaust branch. The high-pressure gas source 10 is equipped with a pressure regulator to preset the gas supply pressure. Automatic valves and manual valves are provided in parallel on the gas supply branch and the exhaust branch. The exhaust branch is used to exhaust and adjust the gas after or during measurement. The gas supply system 11 provides a simulated gas pressure environment under various actual combustion conditions for the given volume incendiary bomb 7;

[0036] like Figure 2 As shown, the constant volume combustion bomb 7 includes a heating element 71, a combustion chamber 73 and an integrated seat 6. The heating element 71 is located at the bottom of the combustion chamber 73 and is connected to the temperature controller 9 to heat the high-pressure gas in the combustion chamber 73 to a preset temperature. The gas supply branch is connected to the bottom of the combustion chamber 73 and is in communication;

[0037] At least one visual window 72 is provided on the side wall of the combustion chamber 73. The multiple visual windows 72 should be evenly distributed circumferentially. The high-speed camera 8 is positioned directly opposite the velocity measurement side of the grain sample 67 through the corresponding visual window 72.

[0038] In order to reduce interference factors and facilitate contactless measurement of the drug column sample 67, the drug column sample 67 is set to a square column structure, clamped on the integrated seat 6 and along the vertical direction, and its electrical excitation is input from two opposite sides, such as Figure 2As shown, the integrated seat 6 can be disassembled as a whole to facilitate the installation of the drug sample 67. The integrated seat 6 includes an adapter 61 and an electrode assembly. The adapter 61 can be detachably plugged into the upper port of the combustion chamber 73 and sealed and installed on the top of the constant volume combustion bomb 7. The electrode assembly includes an electrode column 62, an electrode clamp and an electrode sheet 67b assembled on the adapter 61. The two electrode columns 62 are inserted through the adapter 61 and are symmetrical. The lower end of the electrode column 62 is connected to the electrode clamp on the corresponding side through the electrode wire, and the upper end is connected to the power supply 5 by the electrode wire. The two electrode clamps are installed in parallel on the adapter 61 and are in a vertical state, with a clamping space in the middle.

[0039] The electrode piece 67b can be detachably inserted into the electrode clamping plate, which facilitates the assembly of the grain sample 67 outside the combustion chamber 73 and facilitates the precise positioning and assembly of the grain sample 67 and the electrode piece 67b, ensuring that the grain sample 67 as a whole falls into the excitation area between the two electrode pieces 67b. The two electrode pieces 67b are respectively attached to the two opposite sides of the grain sample 67 and are arranged along the combustion direction of the grain sample 67. After the two electrode pieces 67b of the assembled grain sample 67 are placed in the clamping space, the electrode clamping plate provides elastic clamping force while electrically conducting the electrode pieces 67b.

[0040] Since the two sides of the powder sample 67 are in contact with the electrodes as a whole and completely fall into the excitation area of ​​the two electrode pieces 67b, in order to ignite the powder sample 67 at a fixed point and continuously promote combustion from bottom to top, the powder sample 67 includes an inner core 67a and an outer insulating layer 67c. The lower end of the core 67a extends out of the insulating layer 67c to form an exposed initial combustion section. Figure 3 As shown, the length L of the initial combustion section is 1mm±0.1mm. When the excitation voltage is released between the electrode sheets 67b, the initial combustion section exposed to the excitation area is ignited. The heat generated by the combustion of the grain sample 67 causes the insulating layer 67c near the burning surface to ablate, melt or decompose. As the burning surface advances, the core 67a is continuously exposed to form a new conductive part. After being exposed to the excitation area, the excitation combustion is orderly promoted to achieve continuous and interference-free burning rate measurement of the combustion process. The insulating layer 67c of the grain sample 67 is made of Teflon film. The Teflon film is an insulating film that is not resistant to high temperatures and has excellent dielectric properties. It is easy to wrap and can be well wrapped around the core 67a. As the burning surface advances, the Teflon film near the burning surface is rapidly decomposed by heat and thus retreats axially to form a conductive area of ​​the core 67a.

[0041] In order to facilitate the observation and collection of the burning surface image of the grain sample 67, at least the lower section of the grain sample 67 is located within the observation range of the visual window 72, and any of the other two opposite sides of the grain sample 67, that is, the velocity measurement side that is not in contact with the electrode sheet 67b, is directly opposite the visual window 72.

[0042] As a further technical solution, in order to synchronously collect the burning surface image and the electrical parameters such as current and voltage at the corresponding time phase, the control system includes a host computer 1, an electric control switch 3, a synchronous trigger 2 and an electrical signal collector 4. The electrical signal collector 4 is used to collect electrical parameters such as excitation voltage and excitation current, such as Figure 1 As shown, the electric switch 3 is set on the electrode wire connected to the electrode column 62 and the positive pole of the power supply 5. The host computer 1 is electrically connected to the high-speed camera 8, the electric switch 3 and the electric signal collector 4 through the synchronization trigger 2. The working instructions issued by the host computer 1 can be synchronously sent through the synchronization trigger 2 and trigger the start of the high-speed camera 8, the electric switch 3 and the electric signal collector 4, thereby realizing the precise synchronization of the excitation combustion and the voltage, current and image acquisition, facilitating the system research work, and the image values ​​are transmitted to the host computer 1 in real time.

[0043] As a further technical solution, in order to adapt to the different thicknesses of drug column samples 67, the clamping space between the electrode splints is a laterally elastic variable area. Specifically, the fixed electrode splint 64 is fixed to the adapter 61 through the fixed block 63 to provide a stable support base. The movable electrode splint 65 is fixedly connected to the adapter 61 through the elastic support member 66. The elastic support member 66 can be elastically extended and retracted laterally. The movable electrode splint 65 is set at its end to adapt to the thickness of the drug column sample 67 and provide clamping force, and prevent the drug core 67a from deformation or rupture. The assembly of the fixed electrode splint 64 and the movable electrode splint 65 should ensure that the two are aligned and vertical.

[0044] As a further technical solution, the verticality of the charge sample 67 should be ensured during installation to ensure the accuracy of the burning rate measurement. In order to facilitate the positioning of the charge sample 67, the width of the electrode piece 67b is designed to be consistent with the width of the charge sample 67. The dual-purpose electrode piece 67b positions the charge sample 67. A strip-shaped positioning protrusion (not shown) is raised on the contact surface of the electrode piece 67b with the electrode clamp. The positioning protrusion is parallel to the side edge of the electrode piece 67b. Corresponding vertical positioning grooves (not shown) are provided on both electrode clamps. The vertical positioning grooves run through the lower ends of the electrode clamps. After the two electrode pieces 67b are installed with the charge sample 67, it should be ensured that the charge sample 67 falls completely into the excitation area and the electrode piece 67b is aligned with the side of the charge sample 67. The electrode piece 67b and the charge sample 67 are kept aligned by holding, wrapping a rope or using a clamp. The positioning protrusion is aligned with the vertical positioning groove, and the assembly is inserted into the clamping space until the electrode clamp is completely clamped, completing the accurate installation of the charge sample 67.

[0045] Based on the visual measurement device of the above-mentioned best embodiment, this embodiment provides a measurement method for the visual measurement device of the electronically controlled solid propellant combustion process, such as Figure 4 As shown, it includes the following steps:

[0046] S1, the manufacturing process of the drug column sample 67 with a thin film integrated structure of the drug core 67a is as follows:

[0047] a. Set a forming groove on the mold. The length of the forming groove is less than or equal to the length of the electrode sheet 67b. Mark the forming groove with a non-film line. The non-film line is 1mm ± 0.1mm away from the end face of the groove. Clean and dry the surface of the forming groove of the mold to ensure that there is no impurity adhesion. Then lay Teflon film. One end of the Teflon film is flush with one end of the forming groove, and the other end is flush with the non-film line. The Teflon film must be flat and wrinkle-free, without bubbles. Ensure that a continuous and complete insulating layer 67c is formed on the side wall of the core 67a after molding. Sufficient width of the coating film is reserved on both sides or one side of the Teflon film outside the forming groove.

[0048] b. The raw material formula is mixed and degassed in two stages to improve the density and uniformity of the propellant after curing. First, under set temperature conditions, LiClO4, pure water, HBO3, plasticizer, etc. are poured into a mixing container and stirred, and then placed in a vacuum box for a primary temperature-controlled vacuum degassing to eliminate bubbles therein, completing the primary mixing. After alcohol washing and heat treatment, PVA is poured into a mixing container and stirred, and then placed in a vacuum box for a secondary temperature-controlled vacuum degassing to complete the secondary mixing; thus, a propellant slurry is obtained.

[0049] c. Slowly inject the degassed propellant slurry into the molding tank until it is full. Ensure that the slurry covers the mold evenly and fills the mold fully. After the slurry is injected, the Teflon film is pressed and protected. If the Teflon film is too long, the Teflon film on both sides of the molding tank can be cut to leave enough film width to wrap the core 67a.

[0050] d. Place the mold filled with propellant slurry in a temperature-controlled box, set the curing time, temperature and humidity in the box, and allow the propellant slurry to dry and solidify into a square columnar structure with good mechanical and insulating properties. Stretch and wrap the reserved Teflon film to obtain the final grain sample 67;

[0051] e. De-mold and mark the sample number of the grain sample 67, and inspect its molding quality. The dimensions and electrical properties of the grain sample 67 that meets the quality standards must be measured and recorded.

[0052] S2. Install the drug sample 67; remove the electrode sheet 67b from the electrode clamping plate, and fit the two opposite molding surfaces of the drug sample 67 onto the electrode sheet 67b. To ensure uniform clamping, the two opposite molding surfaces are the two opposite side surfaces that are in contact with the two side walls of the molding groove. Use a flat surface to align the four end surfaces of the electrode sheet 67b and the drug sample 67 to ensure the alignment of the two electrode sheets 67b and ensure that the drug sample 67 falls completely into the excitation area and its two side surfaces are aligned and flat with the side surfaces of the electrode sheet 67b. Clamp the drug sample 67 and the electrode sheet 67b, and place them together between the two electrode clamping plates. Clamp and ensure that the drug sample is in a vertical position.

[0053] S3. Generate a measurement environment; insert the integrated seat 6 into the upper port of the combustion chamber 73 and seal the connection; the temperature controller 9 presets the temperature control temperature, the gas supply system 11 presets the gas supply pressure, and inputs high-pressure gas into the combustion chamber 73. The heating element 71 heats the high-pressure gas in the combustion chamber 73, and a measurement environment with specified temperature and pressure boundary conditions can be generated in the cavity; the power supply 5 can be set with different excitation voltages to simulate combustion parameters under different working conditions; the measuring device supports the generation of the measurement environment, which is conducive to adjusting different environmental pressures, temperatures and electrical excitation conditions according to the working conditions such as the initial ignition and secondary ignition of the grain sample 67, and has good adaptability and scalability, meeting the needs of visualization and quantitative research on the combustion behavior of electronically controlled solid propellants under complex working conditions;

[0054] S4, burning rate measurement; the high-speed camera 8 sets the frame rate of the collected image, the electrical signal collector 4 is connected to the transmission electrode wire of the electrode column 62, and the excitation voltage of the power supply 5 is set. The host computer 1 sends a trigger signal to the high-speed camera 8, the electric control switch 3 and the electrical signal collector 4 through the synchronization trigger 2. The three are started synchronously and have the same time phase. The electrode piece 67b is energized to ignite the initial combustion section at the lower end of the charge sample 67. At the same time, the electrical signal collector 4 synchronously collects the voltage signal and current signal in the electrode assembly. The high-speed camera 8 synchronously and continuously collects the combustion image of the charge sample 67 in the combustion chamber 73 and sends it to the host computer 1 in real time. The image processing program of the host computer 1 extracts the burning surface position frame by frame, and calculates the instantaneous burning rate curve based on the time interval of each frame; the voltage and current signals obtained by the electrical signal collector 4 are synchronously uploaded to the host computer 1 in real time. The image processing program aligns and synchronously processes the image data and the electrical signal data to determine the burning rate. At the same time, in-depth research is conducted on the coupling relationship between the burning rate and the electrical parameters under electronic control.

[0055] The directional words such as "upper", "lower", "side", "end", "bottom", "inside", "outside" mentioned in this article are reference to Figure 1-Figure 3 These terms are mainly used to better describe the present invention and its embodiments, and are not intended to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation;

[0056] Furthermore, some of the above terms may be used to express other meanings besides indicating a direction or positional relationship. For example, the terms "on" and "in" may also be used to express a dependency or connection relationship in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0057] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A visual measurement device for an electronically controlled solid propellant combustion process, characterized in that: The device comprises a dedicated measurement charge sample, a power supply, a control system, a high-speed camera, a constant-volume incendiary bomb, a temperature controller, and an air supply system; the constant-volume incendiary bomb comprises a heating element, a combustion chamber, and an integrated seat; the air supply system is connected to the combustion chamber; the heating element is located in the combustion chamber and is connected to the temperature controller; at least one visual window is provided on a side wall of the combustion chamber; the high-speed camera is directly opposite the visual window; The drug column sample is a square column structure, which is clamped on the integrated seat and along the vertical direction. The integrated seat includes an adapter and an electrode assembly. The electrode assembly is assembled on the adapter. The adapter is detachable and plugged into the upper port of the combustion chamber. The electrode assembly includes an electrode column, an electrode clamp and an electrode sheet. The electrode clamp is installed on the adapter. The two electrode sheets are respectively attached to the two opposite sides of the drug column sample and are arranged along the combustion direction of the drug column sample. The two electrode clamps are respectively located on the outside of the two electrode sheets and are used to apply relative clamping force to the two electrode sheets to clamp the drug column sample. The two electrode plates are respectively connected to the positive and negative poles of the power supply through the electrode columns; At least the lower section of the drug substance sample is located within the observation range of the visual window, and any of the other two opposite sides of the drug substance sample is directly opposite the visual window. The drug substance sample is located within the excitation area of ​​the two electrode sheets. The drug substance sample includes an inner drug core and an outer insulating layer. The lower end of the drug core extends out of the insulating layer to form an exposed initial combustion section.

2. The visual measurement device for the electronically controlled solid propellant combustion process according to claim 1, characterized in that: The control system includes a host computer, an electric control switch, a synchronous trigger and an electrical signal collector. The electric control switch controls the current on and off of the electrode column. The host computer is electrically connected to the high-speed camera, the electric control switch and the electrical signal collector through the synchronous trigger, and is used to synchronously send trigger signals to the high-speed camera, the electric control switch and the electrical signal collector.

3. The visual measurement device for the electronically controlled solid propellant combustion process according to claim 1, characterized in that: The insulating layer of the drug column sample is a Teflon film that decomposes when heated. The Teflon film is wrapped around the drug core and is used to gradually retreat axially as the burning surface advances to expose the conductive part of the drug core.

4. The visual measurement device for the electronically controlled solid propellant combustion process according to claim 3, characterized in that: One of the electrode clamps is fixed to the adapter via a fixing block, and the other electrode clamp is fixedly connected to the adapter via an elastic support member, so as to form a laterally elastic and variable clamping space between the two electrode clamps.

5. The visual measurement device for the electronically controlled solid propellant combustion process according to any one of claims 1 to 4, characterized in that: Both electrode clamps are provided with vertical positioning grooves, which pass through the lower ends of the electrode clamps. Corresponding positioning protrusions are provided on the electrode sheets. The width of the electrode sheets is consistent with the width of the drug column sample, and the sides of the two are aligned. The positioning protrusions are plugged into the vertical positioning grooves for positioning the drug column sample for vertical installation.

6. A visual measurement method for the combustion process of an electronically controlled solid propellant, characterized in that: The following steps are involved: S1. Preparation of drug column samples; a. Set a forming groove on the mold and mark the no-film line on the forming groove. Clean the forming groove and lay Teflon film. One end of the Teflon film should be flush with one end of the forming groove and the other end should be flush with the no-film line. b. Under set temperature conditions, stir and mix the components of the raw material formula in a mixing container, and perform vacuum degassing on the propellant slurry under a vacuum environment to eliminate bubbles therein to obtain a propellant slurry; c. Slowly inject the degassed propellant slurry into the forming tank until it is full. Cut the Teflon film on both sides of the forming tank to leave enough film width to wrap the core. d. Place the mold filled with propellant slurry in a temperature-controlled box, set the curing time, temperature and humidity in the box, dry and solidify the propellant slurry into shape, stretch and wrap the reserved Teflon film to obtain the final grain sample; e. Mark the sample number of the grain sample and inspect its quality. The dimensions and electrical properties of the grain sample that meets the quality standards shall be measured and recorded; S2. Install the drug sample; the electrode sheets are attached to the two opposing forming surfaces of the drug sample, which are the two opposing sides in contact with the side walls of the forming groove, so that the drug sample is completely placed in the excitation area between the two electrode sheets. The drug sample and the electrode sheets are clamped and placed together between the two electrode clamps, and the drug sample is clamped and ensured to be in a vertical position. S3. Generate a measurement environment: Install the integrated base into the upper port of the combustion chamber and seal the connection. Set the temperature control temperature and the gas supply system to preset the gas supply pressure. Input high-pressure gas into the combustion chamber. The heating element heats the high-pressure gas in the combustion chamber to generate a measurement environment for the specified parameter. S4. Burning rate measurement. The host computer sends a trigger signal to the high-speed camera, the electric control switch and the electrical signal collector through a synchronous trigger. The three are started synchronously and have the same time phase. The electrode is energized to ignite the initial combustion segment at the lower end of the propellant sample. At the same time, the electrical signal collector synchronously collects the voltage signal and current signal in the electrode assembly, and the high-speed camera synchronously collects the image of the propellant sample in the combustion chamber and sends them all to the host computer. The image data is analyzed and calculated to obtain the burning rate of the propellant sample under the corresponding excitation conditions.

Images