Active regulation and control method and device for burning speed of electromagnetic sensitive solid propellant

Abstract

The invention discloses an active regulation and control method and device for the burning speed of an electromagnetic sensitive solid propellant, and the method comprises the steps: enabling a plurality of electromagnetic coils to be arranged around the electromagnetic sensitive solid propellant in parallel, combining a step-by-step scanning control strategy, and achieving the precise recognition of a burning surface position through the feedback of the current loaded by the electromagnetic coils, thereby achieving the active regulation and control of the burning speed of the electromagnetic sensitive solid propellant. And the program control system further turns on a certain unit electromagnetic coil power supply, so that the burning speed control of the electromagnetic sensitive solid propellant is realized, and the purpose of actively regulating and controlling the burning speed of the solid propellant is achieved. The device comprises a parameter determination unit, an installation unit, a wiring unit, a calculation unit, a judgment unit and an active regulation and control unit. The technical problems that the combustion process of the traditional Chinese medicine columns in a solid rocket engine cannot be regulated in real time, and the energy management level of the engine is poor are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of solid rocket engines, and in particular relates to a method and a device for actively controlling the burning rate of an electromagnetically sensitive solid propellant. Background Art

[0002] For a long time, missile weapons or rockets as a whole often hope that the thrust of the engine can be adjusted and controlled in real time to achieve efficient energy management in order to obtain better ballistic performance and use performance. However, once the solid grain of the traditional solid rocket engine is ignited in the combustion chamber, its combustion process cannot be regulated in real time, resulting in the difficulty of adjusting the engine thrust output in real time and poor energy management. In the existing technical solutions, the solid rocket engine that can change the thrust in real time is represented by the throat plug type variable thrust solid rocket engine. Its principle is to change the cross-sectional area of ​​the nozzle throat channel by controlling the movement of the throat plug, thereby changing the size of the engine thrust. However, since the throat plug is directly exposed to the harsh environment of high pressure, high temperature and high-speed multi-phase flushing of the nozzle, the throat plug has a very serious ablation problem, the profile is difficult to maintain, resulting in the difficulty of accurate thrust regulation, and there are strict requirements on the size and working time of the engine. In addition, the variable thrust solid rocket engine solution based on electronically controlled propellants is still in the exploratory stage, and there are disadvantages such as low energy level of propellants, difficult electrode arrangement, and the need for additional energy supply. Therefore, the existing technical solutions all have certain problems and application limitations. Summary of the invention

[0003] In order to overcome the defects of the above-mentioned prior art, the purpose of the present invention is to provide a method and device for actively controlling the burning rate of electromagnetically sensitive solid propellant, so as to solve the technical problems that the combustion process of the grain in the solid rocket engine cannot be controlled in real time and the engine energy management level is poor.

[0004] In order to achieve the above object, the present invention adopts the following technical solution: A method for actively controlling the burning rate of an electromagnetically sensitive solid propellant comprises the following steps: 1) Determine the size of electromagnetic sensitive solid propellant, the size of electromagnetic coil unit, the frequency and voltage parameters of electromagnetic generator; determine the number of electromagnetic coil units by the ratio of propellant height to electromagnetic coil unit height; 2) Place the electromagnetic sensitive solid propellant on the stage, and place the electromagnetic coil outside the propellant, ensuring that the electromagnetic coil and the propellant are coaxial and at the same height; 3) Using wires to connect each electromagnetic coil unit with the current sensor, the electromagnetic generator and the electromagnetic generator power supply to form a loop, and the electromagnetic coil units are connected in parallel in the circuit; 4) Turn off the power supply of the electromagnetic generator, use the laser igniter to ignite the electromagnetic sensitive propellant, turn on the high-speed camera to record the retreat of the propellant burning surface, use the Matlab program to calculate the propellant burning rate, and obtain the propellant burning rate r without electromagnetic field excitation. 0 ; 5) Turn on the power supply of the electromagnetic generator and set the voltage to U 1 , record the change of current I of electromagnetic sensitive propellant during the retreat process of each electromagnetic coil unit. When the burning surface passes through the electromagnetic sensitive material, the material melts due to high temperature, and the current in the electromagnetic coil unit is greatly reduced. Record the current value I in the circuit after the melting min is the current threshold, when the current I of the i-th electromagnetic coil unit i <I min When the electromagnetic sensitive material is considered to be melted, the burning surface passes through this place; 6) Design the host computer control program based on the current threshold in step 5), and adjust the on-off status of the electromagnetic coil unit according to the burning rate requirements, thereby realizing active control of the burning rate of the electromagnetic sensitive propellant.

[0005] A further improvement of the present invention is that the size of the electromagnetic sensitive solid propellant is determined, including: the shape, height, length, width or diameter of the electromagnetic sensitive propellant; the size of the electromagnetic coil unit is determined, including: the electromagnetic coil wire diameter, circumferential diameter and coil spacing.

[0006] A further improvement of the present invention is that the electromagnetic sensitive propellant is in the shape of a cuboid or a cylinder.

[0007] A further improvement of the present invention is that the method for determining the voltage of the electromagnetic generator is: energize a certain electromagnetic coil unit, gradually increase the voltage value from 0 V, and record the minimum voltage U that can cause the electromagnetic sensitive propellant to self-ignite 0 , ensure that the voltage applied subsequently is no greater than 0.7 U 0 .

[0008] A further improvement of the present invention is that the method for calculating the burning rate of the propellant using the Matlab program is as follows: the color image obtained by the high-speed camera is converted into a black and white image, i.e., a grayscale image, using the rgb2gray function in the Matlab software; a grayscale value threshold H is determined for finding the position of the burning surface of the propellant, the actual length corresponding to a single pixel is calculated, the height of the burning surface in each image is determined, the height L and time t of the retreat of the burning surface from the beginning to the end of combustion are calculated, and the burning rate of the propellant is obtained by the formula r=L / t.

[0009] A further improvement of the present invention is that the electromagnetic sensitive material includes copper, iron and silver, as well as iron-nickel alloy wire or rod.

[0010] A further improvement of the present invention is that the host computer control program includes: determining the electromagnetic coil unit current threshold value I min , determine the current I of unit i i with I min If the current I i Greater than I min , indicating that the electromagnetic sensitive material has not been melted, and the burning surface has not passed through the electromagnetic coil unit. At this time, there is no need to turn on the power supply to adjust the burning rate; if the current I i Less than I min , indicating that the electromagnetic sensitive material has melted, and the burning surface passes through the electromagnetic coil unit. Turn on the power supply of the electromagnetic generator, adjust the parameters of the electromagnetic coil unit, and adjust the burning rate.

[0011] An electromagnetically sensitive solid propellant burning rate active control device, comprising: A parameter determination unit is used to determine the size of electromagnetic sensitive solid propellant, the size of electromagnetic coil unit, the frequency and voltage parameters of electromagnetic generator; and the number of electromagnetic coil units is determined by the ratio of the propellant height to the electromagnetic coil unit height; The mounting unit is used to place the electromagnetic sensitive solid propellant on the stage, and the electromagnetic coil is placed outside the propellant to ensure that the electromagnetic coil is coaxial and at the same height as the propellant; A wiring unit, used to connect each electromagnetic coil unit with the current sensor, the electromagnetic generator and the electromagnetic generator power supply by means of a wire to form a loop, wherein the electromagnetic coil units are connected in parallel in the circuit; The calculation unit is used to turn off the power supply of the electromagnetic generator, ignite the electromagnetic sensitive propellant with a laser igniter, turn on the high-speed camera to record the retreat of the propellant burning surface, calculate the propellant burning rate using the Matlab program, and obtain the propellant burning rate r without electromagnetic field excitation. 0 ; The judgment unit is used to turn on the power supply of the electromagnetic generator and set the voltage to U 1 , record the change of current I of electromagnetic sensitive propellant during the retreat process of each electromagnetic coil unit. When the burning surface passes through the electromagnetic sensitive material, the material melts due to high temperature, and the current in the electromagnetic coil unit is greatly reduced. Record the current value I in the circuit after melting min is the current threshold, when the current I of the i-th electromagnetic coil unit i <I min When the electromagnetic sensitive material is considered to be melted, the burning surface passes through this place; The active control unit is used to design the upper computer control program according to the current threshold in the judgment unit, and to control the on-off status of the electromagnetic coil unit according to the burning rate requirements, thereby realizing the active control of the burning rate of the electromagnetic sensitive propellant.

[0012] A further improvement of the present invention is that in the parameter determination unit, the size of the electromagnetic sensitive solid propellant is determined, including: the shape, height, length, width or diameter of the electromagnetic sensitive propellant; the size of the electromagnetic coil unit is determined, including: the electromagnetic coil wire diameter, circumferential diameter and coil spacing.

[0013] A further improvement of the present invention is that, in the parameter determination unit, the method for determining the voltage of the electromagnetic generator is: energize a certain electromagnetic coil unit, gradually increase the voltage value from 0 V, and record the minimum voltage U that can cause the electromagnetic sensitive propellant to self-ignite. 0 , ensure that the voltage applied subsequently is no greater than 0.7 U 0 .

[0014] Compared with the prior art, the present invention has at least the following beneficial technical effects: The present invention provides a technical method and device for actively regulating the burning rate of solid propellant grains. The method arranges multi-stage electromagnetic heating coils in parallel around the solid propellant grains. When the burning rate of the solid propellant grains needs to be regulated, the program control system is used to open the high-frequency power supply chassis step by step for electromagnetic heating. According to the working current fed back in real time by the high-frequency power supply chassis, if the working current fed back by a certain unit high-frequency power supply is large, it means that the solid propellant inside the electromagnetic heating coil has not been completely burned out. The burning surface position is determined in this way, and then the power supply of the electromagnetic heating coil near the burning surface is turned on to regulate the burning rate. The subsequent unit coils are regulated in this way, and the electromagnetic heating effect is dynamically loaded with the change of the burning surface of the solid propellant. This scheme changes the disadvantage that the traditional solid propellant can only release energy according to a preset rule once ignited. At the same time, multiple unit electromagnetic coils are arranged in parallel and sequentially controlled to ensure safety and realize precise follow-up loading of electromagnetic excitation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 This is a schematic diagram of the host computer program.

[0017] Figure 2 Schematic diagram of the experimental device of the present invention.

[0018] Figure 3 Schematic diagram of the experimental results of Matlab processing of typical burning rates in Example.

[0019] Figure 4The present invention is a structural block diagram of an electromagnetically sensitive solid propellant burning rate active control device. DETAILED DESCRIPTION

[0020] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0021] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0022] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0023] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0024] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0025] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0026] Example 1 like Figure 2 As shown, the present invention provides an electromagnetic sensitive solid propellant burning rate active control method, comprising the following steps: 1) Determine the size of electromagnetic sensitive solid propellant, the size of electromagnetic coil unit, the frequency and voltage parameters of electromagnetic generator; determine the number of electromagnetic coil units by the ratio of propellant height to electromagnetic coil unit height; 2) Place the electromagnetic sensitive solid propellant on the stage, and place the electromagnetic coil outside the propellant, ensuring that the electromagnetic coil and the propellant are coaxial and at the same height; 3) Use wires to connect each electromagnetic coil unit with the current sensor, the electromagnetic generator, and the electromagnetic generator power supply to form a loop, and the electromagnetic coil units are connected in parallel in the circuit; 4) Turn off the power supply of the electromagnetic generator, use the laser igniter to ignite the electromagnetic sensitive propellant, turn on the high-speed camera to record the retreat of the propellant burning surface, use the Matlab program to calculate the propellant burning rate, and obtain the propellant burning rate r without electromagnetic field excitation. 0 ; 5) Turn on the power supply of the electromagnetic generator and set the voltage to U 1 , record the change of current I of electromagnetic sensitive propellant during the retreat process of each electromagnetic coil unit. When the burning surface passes through the electromagnetic sensitive material, the material melts due to high temperature, and the current in the electromagnetic coil unit is greatly reduced. Record the current value I in the circuit after the melting min is the current threshold, when the current I of the i-th electromagnetic coil unit i <I min When the electromagnetic sensitive material is considered to be melted, the burning surface passes through this place; 6) Design the host computer control program based on the current threshold in step 5), and adjust the on-off status of the electromagnetic coil unit according to the burning rate requirements, thereby realizing active control of the burning rate of the electromagnetic sensitive propellant.

[0027] In this embodiment, the size of the electromagnetic sensitive solid propellant is determined, including: the shape, height, length, width or diameter of the electromagnetic sensitive propellant; the size of the electromagnetic coil unit is determined, including: the electromagnetic coil wire diameter, circumferential diameter and coil spacing.

[0028] In this embodiment, the electromagnetic sensitive propellant is in the shape of a cuboid or a cylinder.

[0029] In this embodiment, the method for determining the voltage of the electromagnetic generator is as follows: energize a certain electromagnetic coil unit, gradually increase the voltage value from 0 V, and record the minimum voltage U that can cause the electromagnetic sensitive propellant to self-ignite. 0 , ensure that the voltage applied subsequently is no greater than 0.7 U 0 .

[0030] In this embodiment, the method for calculating the burning rate of the propellant using the Matlab program is as follows: the color image obtained by the high-speed camera is converted into a black and white image, i.e., a grayscale image, using the rgb2gray function in the Matlab software. The grayscale value threshold H is determined to find the position of the burning surface of the propellant, the actual length corresponding to a single pixel is calculated, the height of the burning surface in each image is determined, the height L and time t of the retreat of the burning surface from the start to the end of the combustion are calculated, and the burning rate of the propellant is obtained by the formula r=L / t.

[0031] In this embodiment, the electromagnetic sensitive material includes copper, iron and silver, as well as iron-nickel alloy wire or rod.

[0032] In this embodiment, the host computer control program, such as Figure 1 As shown, it includes: determining the electromagnetic coil unit current threshold I min , determine the current I of unit i i with I min If the current I i Greater than I min , indicating that the electromagnetic sensitive material has not been melted, and the burning surface has not passed through the electromagnetic coil unit. At this time, there is no need to turn on the power supply to adjust the burning rate; if the current I i Less than I min , indicating that the electromagnetic sensitive material has melted, and the burning surface passes through the electromagnetic coil unit. Turn on the power supply of the electromagnetic generator, adjust the parameters of the electromagnetic coil unit, and adjust the burning rate.

[0033] Example 2 1) The size of electromagnetic sensitive solid propellant is determined to be 5 mm × 5 mm × 50 mm. The electromagnetic sensitive material is 0.4 mm iron wire located in the center of the propellant. The size of the electromagnetic coil unit includes a wire diameter of 2.5 mm, a circumferential diameter of 50 mm, a coil spacing of 5 mm, an electromagnetic coil unit height of 10 mm, an electromagnetic generator frequency of 77 kHz, and an adjustable voltage of 0-55 V. The number of electromagnetic coil units is determined to be 5 by the ratio of the propellant height of 50 mm to the electromagnetic coil unit height of 10 mm. 2) Place a 50 mm electromagnetic sensitive solid propellant on the stage, and place five 10 mm electromagnetic coil units around the propellant, ensuring that the electromagnetic coils are coaxial and at the same height as the propellant; 3) Use wires to connect each electromagnetic coil unit with the current sensor, the electromagnetic generator, and the electromagnetic generator power supply to form a loop, and the electromagnetic coil units are connected in parallel in the circuit; 4) Turn off the power supply of the electromagnetic generator, use the laser igniter to ignite the electromagnetic sensitive propellant, turn on the high-speed camera (resolution 500×800, frame rate 2000 fps) to record the propellant burning surface retreat, and use the Matlab program to calculate the propellant burning rate, such as Figure 3 As shown in the figure, the propellant burning rate r is obtained in the first electromagnetic coil unit without electromagnetic field excitation. 0 =1.16 mm / s; 5) Turn on the power supply of the electromagnetic generator and set the voltage to U 1=60 V, record the change of current I of electromagnetic sensitive propellant during the retreat process of the first and second electromagnetic coil units. When the burning surface passes through the electromagnetic sensitive material, the material melts due to high temperature, and the current in the first electromagnetic coil unit is greatly reduced. Record the current value I in the circuit after the melting. min =0.01 A is the current threshold. When the current I 2 <I min When the electromagnetic sensitive material is considered to be melted, the burning surface passes through this place; 6) Based on the current threshold in step 5), the host computer control program is designed to adjust the voltage and evaluation rate of the second electromagnetic coil unit, achieving a control effect of doubling the burning rate of the electromagnetic sensitive propellant.

[0034] Example 3 like Figure 4 As shown, the present invention provides an electromagnetic sensitive solid propellant burning rate active control device, comprising: A parameter determination unit is used to determine the size of electromagnetic sensitive solid propellant, the size of electromagnetic coil unit, the frequency and voltage parameters of electromagnetic generator; and the number of electromagnetic coil units is determined by the ratio of the propellant height to the electromagnetic coil unit height; The mounting unit is used to place the electromagnetic sensitive solid propellant on the stage, and the electromagnetic coil is placed outside the propellant to ensure that the electromagnetic coil is coaxial and at the same height as the propellant; A wiring unit, used to connect each electromagnetic coil unit with the current sensor, the electromagnetic generator and the electromagnetic generator power supply by means of a wire to form a loop, wherein the electromagnetic coil units are connected in parallel in the circuit; The calculation unit is used to turn off the power supply of the electromagnetic generator, ignite the electromagnetic sensitive propellant with a laser igniter, turn on the high-speed camera to record the retreat of the propellant burning surface, calculate the propellant burning rate using the Matlab program, and obtain the propellant burning rate r without electromagnetic field excitation. 0 ; The judgment unit is used to turn on the power supply of the electromagnetic generator and set the voltage to U 1 , record the change of current I of electromagnetic sensitive propellant during the retreat process of each electromagnetic coil unit. When the burning surface passes through the electromagnetic sensitive material, the material melts due to high temperature, and the current in the electromagnetic coil unit is greatly reduced. Record the current value I in the circuit after melting min is the current threshold, when the current I of the i-th electromagnetic coil unit i <I min When the electromagnetic sensitive material is considered to be melted, the burning surface passes through this place; The active control unit is used to design the upper computer control program according to the current threshold in the judgment unit, and to control the on-off status of the electromagnetic coil unit according to the burning rate requirements, thereby realizing the active control of the burning rate of the electromagnetic sensitive propellant.

[0035] In this embodiment, in the parameter determination unit, the size of the electromagnetic sensitive solid propellant is determined, including: the shape, height, length, width or diameter of the electromagnetic sensitive propellant; the size of the electromagnetic coil unit is determined, including: the electromagnetic coil wire diameter, circumferential diameter and coil spacing.

[0036] In this embodiment, in the parameter determination unit, the method for determining the voltage of the electromagnetic generator is: energize a certain electromagnetic coil unit, gradually increase the voltage value from 0 V, and record the minimum voltage U that can cause the electromagnetic sensitive propellant to self-ignite. 0 , ensure that the voltage applied subsequently is no greater than 0.7 U 0 .

[0037] In summary, the present invention arranges multiple stages of electromagnetic heating coils in parallel around the solid propellant grains and uses electromagnetic heating to control the burning rate. When the burning rate of the solid propellant grains needs to be controlled, the program control system is used to open the high-frequency power supply chassis step by step for electromagnetic heating. According to the working current fed back in real time by the high-frequency power supply chassis, if the working current fed back by a certain unit high-frequency power supply is large, it means that the solid propellant inside the electromagnetic heating coil has not been completely burned out. The burning surface position is determined in this way, and then the power supply of the electromagnetic heating coil near the burning surface is turned on to control the burning rate. The subsequent unit coils are controlled in this way, and the electromagnetic heating effect is dynamically loaded as the burning surface of the solid propellant changes. This scheme changes the shortcoming that traditional solid propellants can only release energy according to a preset rule once ignited. At the same time, multiple unit electromagnetic coils are arranged in parallel and sequentially controlled to ensure safety and realize precise control loading of electromagnetic excitation.

[0038] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0039] In addition, it should be understood that although this specification is described in accordance with the implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A method for actively controlling the burning rate of electromagnetically sensitive solid propellants, characterized in that: The following steps are involved: 1) Determine the size of electromagnetic sensitive solid propellant, the size of electromagnetic coil unit, the frequency and voltage parameters of electromagnetic generator; determine the number of electromagnetic coil units by the ratio of propellant height to electromagnetic coil unit height; 2) Place the electromagnetic sensitive solid propellant on the stage, and place the electromagnetic coil outside the propellant, ensuring that the electromagnetic coil and the propellant are coaxial and at the same height; 3) Using wires to connect each electromagnetic coil unit with the current sensor, the electromagnetic generator and the electromagnetic generator power supply to form a loop, and the electromagnetic coil units are connected in parallel in the circuit; 4) Turn off the power supply of the electromagnetic generator, use the laser igniter to ignite the electromagnetic sensitive propellant, turn on the high-speed camera to record the retreat of the propellant burning surface, use the Matlab program to calculate the propellant burning rate, and obtain the propellant burning rate r0 without electromagnetic field excitation; 5) Turn on the power supply of the electromagnetic generator, set the voltage to U1, and record the change of the current I of the electromagnetic sensitive propellant during the retreat process of each electromagnetic coil unit. When the burning surface passes through the electromagnetic sensitive material, the material melts due to the high temperature, and the current in the electromagnetic coil unit is greatly reduced. Record the current value I in the circuit after the melting. min is the current threshold, when the current I of the i-th electromagnetic coil unit i <I min When the electromagnetic sensitive material is considered to be melted, the burning surface passes through this place; 6) Design the host computer control program based on the current threshold in step 5), and adjust the on-off status of the electromagnetic coil unit according to the burning rate requirements, thereby realizing active control of the burning rate of the electromagnetic sensitive propellant.

2. The method for actively controlling the burning rate of electromagnetically sensitive solid propellant according to claim 1, characterized in that: The size of the electromagnetic sensitive solid propellant is determined, including: the shape, height, length, width or diameter of the electromagnetic sensitive propellant; the size of the electromagnetic coil unit is determined, including: the electromagnetic coil wire diameter, circumferential diameter and coil spacing.

3. The method for actively controlling the burning rate of electromagnetically sensitive solid propellant according to claim 2, characterized in that: The electromagnetic sensitive propellant is in the shape of a cuboid or a cylinder.

4. The method for actively controlling the burning rate of electromagnetically sensitive solid propellant according to claim 1, characterized in that: The method for determining the voltage of the electromagnetic generator is as follows: energize a certain electromagnetic coil unit, gradually increase the voltage value from 0 V, record the minimum voltage U0 that can cause the electromagnetic sensitive propellant to self-ignite, and ensure that the subsequent applied voltage value is no greater than 0.7 U0.

5. The method for actively controlling the burning rate of electromagnetically sensitive solid propellant according to claim 1, characterized in that: The method for calculating the burning rate of propellant using Matlab program is as follows: the color image obtained by the high-speed camera is converted into a black and white image, i.e., a grayscale image, using the rgb2gray function in Matlab software; the grayscale value threshold H is determined to find the position of the burning surface of the propellant, the actual length corresponding to a single pixel is calculated, the height of the burning surface in each image is determined, the height L and time t of the retreat of the burning surface from the beginning to the end of combustion are calculated, and the burning rate of the propellant is obtained by the formula r=L / t.

6. The method for actively controlling the burning rate of electromagnetically sensitive solid propellant according to claim 1, characterized in that: Electromagnetically sensitive materials include copper, iron, and silver, as well as iron-nickel alloy wires or rods.

7. The method for actively controlling the burning rate of electromagnetically sensitive solid propellant according to claim 1, characterized in that: The host computer control program includes: determining the electromagnetic coil unit current threshold I min , determine the current I of unit i i with I min If the current I i Greater than I min , indicating that the electromagnetic sensitive material has not been melted, and the burning surface has not passed through the electromagnetic coil unit. At this time, there is no need to turn on the power supply to adjust the burning rate; if the current I i Less than I min , indicating that the electromagnetic sensitive material has melted, and the burning surface passes through the electromagnetic coil unit. Turn on the power supply of the electromagnetic generator, adjust the parameters of the electromagnetic coil unit, and adjust the burning rate.

8. An electromagnetically sensitive solid propellant burning rate active control device, characterized in that: include: A parameter determination unit is used to determine the size of electromagnetic sensitive solid propellant, the size of electromagnetic coil unit, the frequency and voltage parameters of electromagnetic generator; and the number of electromagnetic coil units is determined by the ratio of the propellant height to the electromagnetic coil unit height; The mounting unit is used to place the electromagnetic sensitive solid propellant on the stage, and the electromagnetic coil is placed outside the propellant to ensure that the electromagnetic coil is coaxial and at the same height as the propellant; A wiring unit, used to connect each electromagnetic coil unit with the current sensor, the electromagnetic generator and the electromagnetic generator power supply by means of a wire to form a loop, wherein the electromagnetic coil units are connected in parallel in the circuit; The calculation unit is used to turn off the power supply of the electromagnetic generator, ignite the electromagnetic sensitive propellant using a laser igniter, turn on a high-speed camera to record the retreat of the propellant burning surface, calculate the propellant burning rate using a Matlab program, and obtain the propellant burning rate r0 without electromagnetic field excitation; The judgment unit is used to turn on the power supply of the electromagnetic generator, set the voltage to U1, and record the change of the current I of the electromagnetic sensitive propellant during the retreat process of each electromagnetic coil unit. When the burning surface passes through the electromagnetic sensitive material, the material melts due to the high temperature, and the current in the electromagnetic coil unit is greatly reduced. The current value I in the circuit after the melting is recorded min is the current threshold, when the current I of the i-th electromagnetic coil unit i <I min When the electromagnetic sensitive material is considered to be melted, the burning surface passes through this place; The active control unit is used to design the upper computer control program according to the current threshold in the judgment unit, and to control the on-off status of the electromagnetic coil unit according to the burning rate requirements, thereby realizing the active control of the burning rate of the electromagnetic sensitive propellant.

9. The electromagnetic sensitive solid propellant burning rate active control device according to claim 8, characterized in that: In the parameter determination unit, the size of the electromagnetic sensitive solid propellant is determined, including: the shape, height, length, width or diameter of the electromagnetic sensitive propellant; the size of the electromagnetic coil unit is determined, including: the electromagnetic coil wire diameter, circumferential diameter and coil spacing.

10. The electromagnetic sensitive solid propellant burning rate active control device according to claim 8, characterized in that: In the parameter determination unit, the method for determining the voltage of the electromagnetic generator is as follows: energize a certain electromagnetic coil unit, gradually increase the voltage value from 0 V, record the minimum voltage U0 that can cause the electromagnetic sensitive propellant to self-ignite, and ensure that the subsequent applied voltage value is no more than 0.7 U0.

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