Precision irradiation modular solid propellant laser ignition experimental device

Abstract

The present invention discloses an experimental device for precisely irradiating modular solid propellant laser ignition, which includes a laser adjustment part, an incident part, a combustion chamber, an observation window, a laser calibration part, an illumination part and a control part; the laser adjustment part includes a mounting plate, a CO2 laser, a laser frame, an electric turntable, a pitching table and an optical path part; the combustion chamber has an inner cavity and a top cover, and a medicine-containing square tube is arranged inside. The incident part is arranged on the top cover. Both the incident part and the top cover have light channels and are on the same vertical line as the opening of the medicine-containing square tube; the observation window is on the side wall of the combustion chamber; the laser calibration part includes a motor mounting seat, a first motor and a baffle. The baffle is detachably mounted on the rotating shaft through a first connecting piece, and a through cross-shaped hole is opened on the baffle; the illumination part includes a lamp holder and a lighting lamp; the control part is connected to the CO2 laser and the two motors. The present invention can adjust the laser direction in three-dimensional space without moving the laser frame, can easily align the laser with the propellant below, achieve precise incidence, and facilitate the laser ignition experiment.

Description

Technical Field

[0001] The invention belongs to the technical field of solid propellant ignition, and in particular relates to a precise irradiation modular solid propellant laser ignition experimental device. Background Art

[0002] Propellant is an important energy source for solid rocket engines, and its combustion characteristics have a significant impact on the performance and working capacity of the engine. Through combustion, the chemical energy in the solid propellant is first converted into heat energy, producing high-temperature and high-pressure combustion gas. The combustion gas expands and accelerates through the nozzle, thereby converting the heat energy into kinetic energy. The combustion gas is ejected backward at high speed, providing a reaction force for the engine, thereby generating thrust. Therefore, the combustion of solid propellants is also a research focus of solid rocket engines. Laser ignition is a common method for conducting solid propellant combustion tests. Laser ignition can more realistically simulate the combustion process of solid propellant in the engine.

[0003] The most common solid propellant laser ignition device is mainly composed of CO 2 The laser and its control device, combustion chamber (reactor), square tube for containing propellant, observation window, pressure sensor, temperature sensor, gas cylinder, high-speed camera, and computer acquisition system are composed. The propellant is placed on the square tube for containing propellant, and then the laser is adjusted to align it with the center of the square tube for containing propellant. The temperature sensor is installed on the reactor cover and connected to the data acquisition card, and the flame of the propellant burning is photographed using a high-speed camera and observation window. After the laser is emitted to ignite the propellant, the flame record during the combustion process and the changes in temperature and pressure in the combustion chamber can be obtained. However, there are some problems with this device: the adjustment of the laser can only be achieved by moving the laser bracket, and it is very troublesome to align the laser with the propellant. After each ignition, the laser needs to be realigned, which is cumbersome. In addition, because there is no lighting component to adjust the focal length of the high-speed camera, it becomes very troublesome to clearly photograph the combustion process of the propellant.

[0004] Therefore, how to conveniently adjust the laser and calibrate the laser to aim at the propellant below, and conveniently adjust the camera to record the combustion process, remains the focus of current research. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a precise irradiation modular solid propellant laser ignition experimental device.

[0006] The precise irradiation modular solid propellant laser ignition experimental device of the present invention comprises a laser adjustment part, an incident part, a combustion chamber, an observation window, a laser calibration part, an illumination part and a control part.

[0007] The laser adjustment unit includes a mounting plate with a through hole, a CO mounted on the mounting plate, 2Laser, mounted on mounting plate and connected to CO 2 The laser frame relative to the laser, an electric turntable connected to the laser frame that can slide and position, a pitching table installed on the electric turntable that can move in the horizontal plane, and a 2 The optical path portion of the laser that transforms the horizontal laser beam into a vertical laser beam, and the through hole is used for the vertical laser beam to pass through.

[0008] The combustion chamber is located below the optical path portion, and has an inner cavity and a top cover. A square tube for containing medicine with an opening facing upward is arranged in the combustion chamber. The incident portion is installed on the upper surface of the top cover, and has a first light channel that runs through from top to bottom. The top cover has a second light channel that runs through from top to bottom. The openings of the first light channel, the second light channel, and the square tube for containing medicine are on the same vertical line.

[0009] The observation window is located on the side wall of the combustion chamber.

[0010] The laser calibration part includes a motor mounting seat, a first motor and a baffle. The motor mounting seat is installed on the inner wall of the combustion chamber. The first motor is detachably mounted on the motor mounting seat. The rotating shaft of the first motor is vertical. The baffle is detachably mounted on the rotating shaft through a first connecting member. A cross-shaped hole is provided on the baffle. As the rotating shaft rotates, the baffle moves in a circular arc shape on the horizontal plane.

[0011] The lighting part comprises a lamp holder and a lighting lamp. The lamp holder is mounted on the inner wall of the combustion chamber, and the lighting lamp is mounted on the lamp holder.

[0012] Control Department and CO 2 Laser, first motor connection and control CO 2 Laser, first motor.

[0013] The baffle is driven to move between the opening of the medicine-containing square tube and the second light channel by the rotation of the first motor shaft, and the horizontal position of the pitch platform is adjusted by the electric turntable, and the pitch angle of the pitch platform is adjusted to make the light from the CO 2 The laser light of the laser falls into the opening of the medicine-containing square tube through the optical path part, the through hole, the first optical channel, the second optical channel and the cross-shaped hole.

[0014] Furthermore, the laser frame has a crossbar, and the crossbar is connected to the CO 2The laser travel direction of the laser is vertical, and a positioning groove is provided on the crossbar. The electric turntable includes a box body with an inner cavity and a disk located outside the box body. The disk surface is horizontal. A second motor, a worm coaxially connected to the rotating shaft of the second motor, and a worm wheel used in conjunction with the worm are installed in the box body. The rotating shaft of the worm wheel extends out of the box body and is coaxially connected to the disk; the second motor is connected to the control unit and controlled by the control unit. The box body of the electric turntable is slidably connected to the crossbar through a sliding sleeve. The sliding sleeve is provided with a through hole. The electric turntable is positioned by inserting a pin into the through hole on the sliding sleeve and the positioning groove on the crossbar. The pitch table is connected to the electric turntable through a second connecting member. The second connecting member is formed by connecting a horizontal plate and a vertical plate. The side of the disk away from the worm wheel is fixedly connected to the horizontal plate through a first connecting rod. The pitch table is installed on the vertical plate near the CO 2 On one side of the laser. 2 A bracket is installed on one side of the laser, and an optical path part is placed on the bracket. The optical path part includes a plane mirror and a focusing mirror.

[0015] The electric turntable is slidably connected to the crossbar through a sliding sleeve and can be positioned, so that the position of the electric turntable itself can be adjusted, which is conducive to laser calibration. The worm and worm gear structure drives the disc to rotate, and the rotation of the disc drives the displacement of the second connecting member, and the displacement of the second connecting member drives the displacement of the pitching platform, and the displacement of the pitching platform drives the displacement of the optical path part, thereby adjusting the position of the optical path part on the horizontal plane, and using laser calibration. By setting up the pitching platform, it is convenient to adjust the pitch angle of the optical path part connected to it, and use laser calibration.

[0016] Furthermore, the incident part includes an incident cover, selenium glass, an annular soft top and an annular hard cover. The first optical channel is located on the incident cover and is divided into a lower channel and an upper channel. The aperture of the lower channel is larger than that of the upper channel. In the lower channel, the hard cover, selenium glass and soft top are arranged in sequence from top to bottom; the diameter of the incident cover is smaller than the diameter of the top cover, and a sensor interface is provided on the top cover.

[0017] The light transmittance of the selenium glass is extremely high, which can ensure that the laser is smoothly incident on the combustion surface in the combustion chamber.

[0018] Furthermore, observation window mounting openings are respectively opened on the three side walls of the combustion chamber, and the observation window mounting openings are step holes. There are three observation windows, which are respectively installed in the three observation window mounting openings, and the laser calibration part and the lighting part are located on the remaining side wall; the observation window includes a glass mounting seat, optical glass, a glass mounting flange and two annular elastic rubber gaskets for sealing, one side of the glass mounting seat is provided with an inwardly concave groove for placing the optical glass, and the other side is a protruding end for use with the step hole, a through observation port is provided from the end face of the protruding end to the bottom face of the groove, and a through observation port is also provided in the middle of the glass mounting flange, the two rubber gaskets are respectively located on the two side faces of the optical glass, the optical glass and the two rubber gaskets are located between the glass mounting seat and the glass mounting flange, and the optical glass and the two rubber gaskets are fastened by installing the glass mounting flange to the glass mounting seat.

[0019] The above observation window is modular and easy to install and replace.

[0020] Furthermore, the control unit includes a computer, a control panel and a control box, and the computer and the control panel are connected to the CO 2 Laser and control CO 2 The laser is provided, and the control box is connected with the first motor and the second motor and controls the first motor and the second motor.

[0021] Furthermore, a product collection tray is provided at the bottom of the combustion chamber. In this way, it is convenient to collect the combustion residues for combustion product and combustion efficiency analysis. A through hole is opened on the side of the combustion chamber where the lamp holder is installed and a sealing cover is provided. In this way, when the precision irradiation modular solid propellant laser ignition experimental device is not in use, the aviation plug can be conveniently stored in the combustion chamber cavity through the through hole and sealed.

[0022] The present invention also provides a solid propellant laser ignition method using the above-mentioned precise irradiation modular solid propellant laser ignition experimental device, which comprises the following steps:

[0023] 1) Fix the mounting plate of the laser adjustment unit on the spare experimental table and install the combustion chamber under the laser adjustment unit;

[0024] 2) Place solid propellant in the center of the square tube containing powder in the combustion chamber and cover it with the top cover;

[0025] 3) Use the control unit to control the first motor to rotate and drive the baffle to move to the top of the opening of the medicine-containing square tube, and use the electric turntable and the pitch table to adjust the direction of laser incidence so that the laser incidence point falls exactly on the cross-shaped hole of the baffle;

[0026] 4) Use the control unit to control the first motor to remove the baffle, open the top cover, take out the first motor and the baffle, and close the top cover, connect the sensor to the sensor interface on the top cover, and connect the spare data acquisition card, and seal the combustion chamber to prevent air leakage during pressurization;

[0027] 5) Turn on the lighting, place the spare high-speed camera next to the observation window, adjust the focal length so that it can clearly capture the solid propellant and its burning flame, and then turn off the lighting;

[0028] 6) Use the control unit to control the laser injection, ignite the solid propellant, collect data and photograph the combustion process;

[0029] 7) Obtain temperature and pressure data in the combustion chamber through sensors and data acquisition cards, and analyze data changes before and after combustion;

[0030] 8) After the combustion is completed, open the top cover and analyze the combustion products and combustion efficiency of the burned medicine residue collected on the product collection plate;

[0031] 9) Install the first motor and baffle for use in the next experiment.

[0032] Beneficial effects: The present invention realizes the adjustment of the laser direction in three-dimensional space without moving the laser frame through the electric turntable, the pitch table, the baffle with a cross-shaped hole, the first motor and other components, and can easily align the laser with the propellant below, thereby realizing the precise incidence of the laser and making it more convenient to carry out the propellant laser ignition experiment; the electric turntable is slidably connected to the cross bar through a sliding sleeve and can be positioned, and the position of the electric turntable itself can be adjusted, which is beneficial to laser calibration; the disk is driven to rotate by the worm and worm gear structure, and the rotation of the disk drives the displacement of the second connecting member, and the displacement of the second connecting member drives the pitch table and the optical path part thereon to shift, which can arbitrarily perform forward and reverse rotation with extremely small backlash, thereby realizing the adjustment of the laser incident direction in the horizontal direction, and utilizing laser Calibration; by setting up a pitch platform, it is convenient to adjust the pitch angle of the optical path part connected to it, and use laser calibration; by setting a selenium glass with extremely high light transmittance at the incident part, it can ensure that the laser is smoothly incident on the burning surface in the combustion chamber; by setting the observation window to be modular, it is convenient to install and replace; the control part uses a computer, a control box, etc., which is convenient for operation and control; by placing a product collection plate on the periphery of the square tube containing medicine, it is convenient to analyze the combustion products and combustion efficiency of the collected burned medicine residues; by opening a through hole on the side of the combustion chamber where the lamp holder is installed and setting a sealing cover, when the precise irradiation modular solid propellant laser ignition experimental device is not in use, the aviation plug can be conveniently received into the inner cavity of the combustion chamber from the through hole and sealed. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1It is an overall three-dimensional schematic diagram of the present invention;

[0034] Figure 2 yes Figure 1 A partial enlarged view of the laser adjustment part;

[0035] Figure 3 yes Figure 1 A schematic diagram of a vertical cross section of the middle incident portion at the center;

[0036] Figure 4 is a schematic diagram of the combustion chamber;

[0037] Figure 5 It is a top view of the combustion chamber;

[0038] Figure 6 yes Figure 5 GG screenshots;

[0039] Figure 7 yes Figure 5 HH screenshots;

[0040] In the figure, 1. mounting plate; 2. CO 2 Laser; 3. Laser frame; 31. Crossbar; 4. Electric turntable; 41. Disc; 42. Sleeve; 5. Pitch table; 51. Cross plate; 52. Vertical plate; 53. Bracket; 6. Optical path; 7. Combustion chamber; 71. Top cover; 711. Sensor interface; 72. Square tube for medicine; 8. Incident cover; 9. Selenium glass; 10. Soft top; 11. Hard cover; 12. Observation window; 121. Glass mounting seat; 122. Optical glass; 123. Glass mounting flange; 124. Rubber gasket; 13. Product collection tray; 14. Sealing cover; 15. Motor mounting seat; 16. First motor; 17. Baffle; 18. First connecting piece; 19. Lamp holder; 20. Illuminating lamp; 21. Control unit; 22. Terminal hole. DETAILED DESCRIPTION

[0041] The present invention will now be further described in detail by way of embodiments in conjunction with the accompanying drawings, but the present invention is not limited to the embodiments.

[0042] like Figure 1As shown, the present invention is a precise irradiation modular solid propellant laser ignition experimental device, comprising a laser adjustment unit, an incident unit, a combustion chamber 7, an observation window 12, a laser calibration unit, an illumination unit and a control unit 21. The laser adjustment unit is used to adjust the incident laser to ensure that it is aligned with the burning surface to ignite the solid propellant, the incident unit is used to ensure that the laser penetrates and enters the combustion chamber 7, the combustion chamber 7 is an internally sealed combustion chamber, and the interior of the combustion chamber 7 is the combustion space of the solid propellant, the observation window 12 is used to facilitate the observation of the flame shape and the recording of the combustion process, the laser calibration unit is used to correct the laser incident point so that it hits the solid propellant, and the illumination unit is used to illuminate the solid propellant to facilitate focusing when shooting the flame with a high-speed camera.

[0043] Specifically, if Figure 1-2 As shown, the laser adjustment unit includes a mounting plate 1 having a through hole, a CO mounted on the mounting plate 1 2 Laser 2, mounted on mounting plate 1 and connected to CO 2 The laser frame 3 is opposite to the laser 2, the electric turntable 4 connected to the laser frame 3 can slide and position, the pitching platform 5 installed on the electric turntable 4 can move in the horizontal plane, and the pitching platform 5 is installed on the pitching platform 5 for transmitting the laser beam from the CO 2 The optical path portion 6 of the laser 2 converts the horizontal laser beam into the vertical laser beam, and the through hole is used for the vertical laser beam to pass through. In this way, the laser adjustment in the horizontal direction and the vertical direction can be combined to achieve the adjustment of the laser incident direction in three-dimensional space.

[0044] The laser frame 3 has a cross bar 31 with a substantially square cross section. 2 The laser of the laser 2 travels in a vertical direction, and a positioning groove is provided on the crossbar 31 .

[0045] The electric turntable 4 includes a box body with an inner cavity and a disc 41 located above the box body. The disc surface of the disc 41 is horizontal. A second motor, a worm coaxially connected to the shaft of the second motor, and a worm wheel used in conjunction with the worm are installed in the box body. The shaft of the worm wheel extends out of the box body and is coaxially connected to the disc 41. The signal line of the second motor is led out of the box body to the outside of the box and connected to the control unit 21 and controlled by the control unit 21. The box body of the electric turntable 4 is slidably connected to the crossbar 31 through a square sliding sleeve 42. The sliding sleeve 42 is provided with a through hole. The electric turntable 4 is positioned by inserting a pin into the through hole on the sliding sleeve 42 and the positioning groove on the crossbar 31. The through hole on the sliding sleeve 42 can be a screw hole, and the pin can be a bolt.

[0046] The pitching platform 5 is connected to the electric turntable 4 through a second connecting member, which is composed of a horizontal plate 51 and a vertical plate 52. The side (upper side) of the disc 41 away from the worm gear is fixedly connected to the lower surface of the horizontal plate 51 through a first connecting rod. The pitching platform 5 is installed on the vertical plate 52 near the CO 2On one side of the laser 2, the vertical plate 52 is located between the electric turntable 4 and the tilting platform 5. The tilting platform 5 is close to the CO 2 A bracket 53 is installed on one side of the laser 2, and the optical path part 6 is placed on the bracket 53. The optical path part 6 includes a plane mirror and a focusing mirror. The specific structure of the optical path part 6 can refer to the prior art. The pitch table 5 adopts the SJ120-30 precision arc slide table. By manually adjusting the knob on the right side of the instrument, the upper plane of the instrument can produce a small range of pitch angles, thereby realizing the adjustment of the vertical angle of the laser.

[0047] The combustion chamber 7 (reactor) is located below the optical path portion 6. Figure 4 , Figure 5 As shown, the combustion chamber 7 has an inner cavity surrounded by four side walls and a top cover 71 for sealing the inner cavity. A square tube 72 for containing powder with an upward opening and vertical is arranged in the combustion chamber 7. The structure of the combustion chamber 7 can refer to the prior art. Figure 3 As shown, the incident part is installed on the upper surface of the top cover 71, and the middle part of the incident part has a first light channel that runs through from top to bottom, and the middle part of the top cover 71 has a second light channel that runs through from top to bottom. The openings of the first light channel, the second light channel, and the square tube 72 for medicine are on the same vertical line. The incident part includes an incident cover 8, selenium glass 9, an annular soft top 10, and an annular hard cover 11. The first light channel is located on the incident cover 8 and is divided into a lower channel and an upper channel. The aperture of the lower channel is larger than that of the upper channel. In the lower channel, the hard cover 11, selenium glass 9, and soft top 10 are arranged and installed in sequence from top to bottom, which can ensure that there is no air leakage when the combustion chamber 7 is pressurized, and can ensure that the laser can be smoothly shot into the combustion chamber 7. The selenium glass 9 is specifically zinc selenide glass. The diameter of the incident cover 8 is smaller than that of the top cover 71. The incident cover 8 is provided with a plurality of through holes, and the top cover 71 is provided with corresponding screw holes. Bolts are passed through the through holes of the incident cover 8 and screwed into the screw holes of the top cover 71 to fasten the incident cover 8 to the top cover 71. The top cover 71 is provided with a sensor interface 711. A product collection tray 13 is placed outside the square tube 72 for containing charge at the bottom of the combustion chamber 7 to collect the residue after combustion, so as to facilitate SEM to study its combustion products.

[0048] The observation window 12 is located on the side wall of the combustion chamber 7. There are three observation windows 12, which are respectively installed in the observation window installation openings opened on the three side walls. The observation window installation openings are step holes. The laser calibration part and the lighting part are located on the remaining side wall of the combustion chamber.

[0049] like Figure 7As shown, the observation window 12 includes a glass mounting seat 121, an optical glass 122, a glass mounting flange 123 and two annular elastic rubber gaskets 124 for sealing. One side of the glass mounting seat 121 is provided with an inwardly concave groove for placing the optical glass 122, and the other side is a protruding end for use with the step hole of the observation window mounting port. A through observation port is provided from the end face of the protruding end to the bottom face of the groove, and a through observation port is also provided in the middle of the glass mounting flange 123. The two rubber gaskets 124 are respectively located on the two side faces of the optical glass 122 for sealing. The optical glass 122 and the two rubber gaskets 124 are located between the glass mounting seat 121 and the glass mounting flange 123. The optical glass 122 and the two rubber gaskets 124 are fastened by mounting the glass mounting flange 123 to the glass mounting seat 121 using bolts and nuts. The above-mentioned glass mounting seat 121, optical glass 122 and glass mounting flange 123 are connected together to form a module, and then the glass mounting seat 121 of the module is fixed to the side wall of the combustion chamber 7 with bolts. From the outside to the inside, the side of the combustion chamber 7 is composed of the glass mounting seat 121, rubber gasket 124, optical glass 122, rubber gasket 124 and glass mounting flange 123.

[0050] like Figure 6 As shown, the laser calibration part includes a motor mounting base 15, a first motor 16 and a baffle 17. The motor mounting base 15 is installed on the inner wall of the combustion chamber 7 by bolts. The first motor 16 is detachably installed on the motor mounting base 15 by bolts. The first motor 16 is a stepper motor with a vertical rotating shaft. The first motor 16 and the baffle 17 are connected by a first connecting member 18. The first connecting member 18 includes a second connecting rod and a coupling connected to one end of the second connecting rod. The coupling is detachably connected to the rotating shaft of the first motor 16. A mounting hole is provided at the end of the second connecting rod away from the coupling. A mounting hole is also provided on the baffle 17. Bolts and nuts are used to fasten the baffle 17 and the second connecting rod. The second connecting rod is perpendicular to the rotating shaft. A cross-shaped hole is provided on the baffle 17.

[0051] The lighting unit includes a lamp holder 19 and a lighting lamp 20. The lamp holder 19 is installed on the inner wall of the combustion chamber 7 by bolts, and the lighting lamp 20 is installed on the lamp holder 19. Two terminal holes 22 are provided on the side wall of the combustion chamber 7. After the terminal holes are connected, the first motor 16 and the lighting lamp 20 are powered respectively. In this way, the lighting in the combustion chamber 7 can be realized, and the focus of the high-speed camera can be easily adjusted when shooting the burning flame. A through hole is provided on the side of the combustion chamber 7 where the lamp holder 19 is installed, and a sealing cover 14 is provided. When the experimental device is not in use, the sealing cover 14 can be opened to store the aviation plug into the inner cavity of the combustion chamber 7, and then the sealing cover 14 is covered to seal it.

[0052] The control unit 21 includes a computer, a control panel and a control box. The computer and the control panel are connected to the CO 2 Laser 2 and control CO 2Laser 2, the control box is connected to the first motor 16 and the second motor and controls the first motor 16 and the second motor. The computer has a host and a display connected to the host. The computer host chip model is AMD FX (tm) -8300 Eight-Core Processor, and the computer is installed with AutoLaser V3.2.6 software (developed by Taizhi Technology Co., Ltd.). Computer, control panel control CO 2 The laser loading time and heat flux density of the laser 2 can be specifically referred to the prior art. A wire hole is provided at the position of the motor mounting seat 15 on the side wall of the combustion chamber 7. One end of the signal line extends into the wire hole and is connected to the motor mounting seat 15, and the other end is connected to the control box of the control unit 21. After the first motor 16 is installed on the motor mounting seat 15, the control box controls the operation of the first motor 16. As the shaft rotates, the baffle 17 moves in an arc shape on the horizontal plane, and the baffle 17 can be easily adjusted to the specified position, so that the cross-shaped hole on the baffle 17 can be aligned with the opening of the medicine-containing square tube 72. In addition, the control box is also connected to the signal line of the second motor and controls the operation of the second motor.

[0053] Specifically, the control box controls the rotation of the first motor 16 shaft to drive the baffle 17 to move between the opening of the medicine-containing square tube 72 and the second light channel, and controls the second motor shaft in the electric turntable 4 to rotate to adjust the horizontal position of the pitch table 5, and manually adjusts the pitch angle of the pitch table 5 (i.e., vertical adjustment) so that the light from the CO 2 The laser of the laser 2 passes through the optical path portion 6, the through hole, the first optical channel, the second optical channel and the cross-shaped hole and falls into the opening of the square tube 72 containing medicine; then the baffle 17 is retracted by the first motor 16, so that the laser can directly hit the opening of the square tube 72 containing medicine.

[0054] The method for performing solid propellant laser ignition using the above-mentioned precision irradiation modular solid propellant laser ignition experimental device comprises the following steps:

[0055] 1) Use expansion bolts to fix the mounting plate 1 of the laser adjustment unit on the spare experimental table through the preset through holes, and install the combustion chamber 7 under the laser adjustment unit;

[0056] 2) Put solid propellant in the center of the square tube 72 in the combustion chamber 7 and cover it with the top cover 71;

[0057] 3) Use the control box of the control unit 21 to control the first motor 16 to rotate and drive the baffle 17 to move to the top of the opening of the medicine-containing square tube 72, use the control box of the control unit 21 to control the second motor in the electric turntable 4 to rotate to adjust the horizontal position of the pitch table, and manually adjust the pitch angle of the pitch table 5 to adjust the direction of laser incidence so that the laser incidence point falls exactly on the cross-shaped hole of the baffle 17;

[0058] 4) Use the control box of the control unit 21 to control the first motor 16 to move the baffle 17, open the top cover 71, take out the first motor 16 and the baffle 17, and cover the top cover 71, connect the sensor to the sensor interface 711 on the top cover 71, and connect the spare data acquisition card, and seal the terminal hole 22, the wire hole of the first motor, and the holes through which the pipes of the pressurization system and the pressure relief system pass to prevent air leakage during pressurization;

[0059] 5) Turn on the lighting 20, place the spare high-speed camera next to the observation window 12, adjust the focal length so that the solid propellant and its burning flame can be clearly photographed, and turn off the lighting after the camera is focused;

[0060] 6) Press the data acquisition button, the trigger line button of the high-speed camera, and the buttons on the computer and control panel of the control unit 21 to operate the CO 2 Laser incident, the laser directly hits the solid propellant to ignite the solid propellant, and collects data and photographs the combustion process;

[0061] 7) Obtain the temperature and pressure data in the combustion chamber 7 through sensors and data acquisition cards, and analyze the data changes before and after combustion;

[0062] 8) After the combustion is completed, the top cover 71 is opened, and the combustion products and combustion efficiency of the burned residue collected on the product collection plate 13 are analyzed;

[0063] 9) Install the first motor 16 and the baffle 17 for use in the next experiment.

[0064] At present, it is still difficult to adjust and calibrate the laser in the laser ignition experiment. The experimental device uses an electric turntable 4 and a pitch table 5 to adjust the laser incident direction, and uses a first motor 16 for calibration, which can achieve precise laser incidence. The pressure sensor and the temperature sensor are used to observe the changes in pressure and temperature in the combustion chamber 7. The experimental scheme is simple and easy to implement, and can more conveniently carry out solid propellant laser ignition experiments and study the combustion characteristics of different solid propellants. It has a high promotion and application value.

[0065] The above-mentioned technologies not specifically mentioned are all referred to the prior art.

[0066] Based on the above-mentioned ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above-mentioned description. The technical scope of the present invention is not limited to the contents of the specification.

Claims

1. A precision irradiation modular solid propellant laser ignition experimental device, characterized in that: It comprises a laser adjustment unit, an incident unit, a combustion chamber (7), an observation window (12), a laser calibration unit, an illumination unit and a control unit (21); The laser adjustment unit comprises a mounting plate (1) having a through hole, a CO2 laser (2) mounted on the mounting plate (1), a laser frame (3) mounted on the mounting plate (1) and opposite to the CO2 laser (2), an electric turntable (4) connected to the laser frame (3) and capable of sliding and positioning, a pitching table (5) mounted on the electric turntable (4) and capable of moving in a horizontal plane, and an optical path unit (6) mounted on the pitching table (5) and used for converting a horizontal laser beam from the CO2 laser (2) into a vertical laser beam, wherein the through hole is used for the vertical laser beam to pass through; The combustion chamber (7) is located below the optical path portion (6), the combustion chamber (7) having an inner cavity and a top cover (71), a square tube (72) for containing medicine with an opening facing upward is arranged in the combustion chamber (7), the incident portion is mounted on the upper surface of the top cover (71), and has a first light channel that passes through from top to bottom, the top cover (71) has a second light channel that passes through from top to bottom, and the openings of the first light channel, the second light channel, and the square tube (72) for containing medicine are on the same vertical line; The observation window (12) is located on the side wall of the combustion chamber (7); The laser calibration portion comprises a motor mounting seat (15), a first motor (16) and a baffle (17); the motor mounting seat (15) is mounted on the inner wall of the combustion chamber (7); the first motor (16) is detachably mounted on the motor mounting seat (15); the rotating shaft of the first motor (16) is vertical; the baffle (17) is detachably mounted on the rotating shaft via a first connecting member (18); a cross-shaped hole is formed on the baffle (17); as the rotating shaft rotates, the baffle (17) moves in an arc shape on a horizontal plane; The lighting unit comprises a lamp holder (19) and a lighting lamp (20), wherein the lamp holder (19) is mounted on the inner wall of the combustion chamber (7), and the lighting lamp (20) is mounted on the lamp holder (19); The control unit (21) is connected to the CO2 laser (2) and the first motor (16) and controls the CO2 laser (2) and the first motor (16); The baffle (17) is driven to move between the opening of the medicine-containing square tube (72) and the second optical channel by the rotation of the rotating shaft of the first motor (16), and the horizontal position of the pitch platform (5) is adjusted by the electric turntable (4), and the pitch angle of the pitch platform (5) is adjusted so that the laser light from the CO2 laser (2) falls into the opening of the medicine-containing square tube (72) through the optical path portion (6), the through hole, the first optical channel, the second optical channel and the cross-shaped hole; The incident portion comprises an incident cover (8), selenium glass (9), an annular soft top (10) and an annular hard cover (11); the first light channel is located on the incident cover (8) and is divided into a lower channel and an upper channel; the aperture of the lower channel is larger than the aperture of the upper channel; in the lower channel, the hard cover (11), the selenium glass (9) and the soft top (10) are arranged in sequence from top to bottom; the diameter of the incident cover (8) is smaller than the diameter of the top cover (71); and a sensor interface (711) is provided on the top cover (71).

2. The precise irradiation modular solid propellant laser ignition experimental device according to claim 1 is characterized in that: The laser frame (3) has a crossbar (31), the crossbar (31) is perpendicular to the direction of travel of the laser from the CO2 laser (2), and a positioning groove is provided on the crossbar (31); The electric turntable (4) comprises a box body having an inner cavity and a disc (41) located outside the box body, the disc surface of the disc (41) being horizontal, a second motor, a worm coaxially connected to the rotating shaft of the second motor, and a worm wheel used in conjunction with the worm wheel are installed in the box body, the rotating shaft of the worm wheel protruding from the box body and coaxially connected to the disc (41); the second motor is connected to the control unit (21) and is controlled by the control unit (21); The housing of the electric turntable (4) is slidably connected to the crossbar (31) by means of a sliding sleeve (42), the sliding sleeve (42) is provided with a through hole, and the electric turntable (4) is positioned by inserting a latch into the through hole on the sliding sleeve (42) and the positioning groove on the crossbar (31); The pitch platform (5) is connected to the electric turntable (4) via a second connecting member, the second connecting member being formed by connecting a horizontal plate (51) and a vertical plate (52), a side of the disk (41) away from the worm gear being fixedly connected to the horizontal plate (51) via a first connecting rod, and the pitch platform (5) is mounted on a side surface of the vertical plate (52) close to the CO2 laser (2); A bracket (53) is installed on a side of the pitch platform (5) close to the CO2 laser (2), and an optical path portion (6) is placed on the bracket (53), wherein the optical path portion (6) comprises a plane mirror and a focusing mirror.

3. The precise irradiation modular solid propellant laser ignition experimental device according to claim 2 is characterized in that: Observation window mounting openings are respectively provided on the three side walls of the combustion chamber (7), the observation window mounting openings being step holes, there are three observation windows (12), which are respectively installed in the three observation window mounting openings, and the laser calibration part and the lighting part are located on the remaining side wall; the observation window (12) comprises a glass mounting seat (121), an optical glass (122), a glass mounting flange (123) and two annular elastic rubber gaskets (124) for sealing; one side of the glass mounting seat (121) is provided with an inwardly concave groove for placing the optical glass (122), and the other side is provided with a convex groove for accommodating the optical glass (122). The end is used to cooperate with the step hole, a through observation port is provided from the end surface of the protruding end to the bottom surface of the groove, and a through observation port is also provided in the middle of the glass mounting flange (123). Two rubber gaskets (124) are respectively located on two side surfaces of the optical glass (122), and the optical glass (122) and the two rubber gaskets (124) are located between the glass mounting seat (121) and the glass mounting flange (123). The optical glass (122) and the two rubber gaskets (124) are fastened by mounting the glass mounting flange (123) on the glass mounting seat (121).

4. The precise irradiation modular solid propellant laser ignition experimental device according to claim 3 is characterized in that: The control unit (21) comprises a computer, a control panel and a control box, the computer and the control panel are connected to the CO2 laser (2) and control the CO2 laser (2), and the control box is connected to the first motor (16) and the second motor and controls the first motor (16) and the second motor.

5. The precise irradiation modular solid propellant laser ignition experimental device according to claim 4 is characterized in that: A product collecting plate (13) is provided at the bottom of the combustion chamber (7), and a through opening and a sealing cover (14) are provided on the side of the combustion chamber (7) where the lamp holder (19) is installed.

6. A solid propellant laser ignition method using the precision irradiation modular solid propellant laser ignition experimental device according to any one of claims 1 to 5, characterized in that: The following steps are involved: 1) Fix the mounting plate (1) of the laser adjustment unit on a spare experimental table, and install the combustion chamber (7) below the laser adjustment unit; 2) placing solid propellant in the center of the square tube (72) containing propellant in the combustion chamber (7) and covering it with a top cover (71); 3) using the control unit (21) to control the first motor (16) to rotate and drive the baffle (17) to move to the position just above the opening of the medicine-containing square tube (72), and using the electric turntable (4) and the pitch table (5) to adjust the direction of laser incidence so that the laser incidence point falls exactly into the cross-shaped hole of the baffle (17); 4) using the control unit (21) to control the first motor (16) to move the baffle (17), opening the top cover (71), taking out the first motor (16) and the baffle (17), and closing the top cover (71), connecting the sensor to the sensor interface (711) on the top cover (71), and connecting a spare data acquisition card, and sealing the combustion chamber (7) to prevent air leakage during pressurization; 5) Turn on the lighting (20), place a spare high-speed camera next to the observation window (12), adjust the focal length so that the solid propellant and its burning flame can be clearly photographed, and then turn off the lighting (20); 6) using the control unit (21) to control the laser incidence, ignite the solid propellant, collect data and photograph the combustion process; 7) Obtaining temperature and pressure data in the combustion chamber (7) through sensors and a data acquisition card, and analyzing data changes before and after combustion; 8) After the combustion is completed, the top cover (71) is opened, and the combustion products and combustion efficiency of the burned medicine residue collected on the product collection plate (13) are analyzed; 9) Install the first motor (16) and the baffle (17) for use in the next experiment.

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