Solid propellant combustion residue complete collection system and method

Abstract

The invention discloses a solid propellant combustion residue complete collection system and method.The system comprises a combustion chamber shell, an ignition mechanism arranged in the combustion chamber shell, a clamping mechanism, a high-pressure gas cylinder and a buffer gas cylinder, and the high-pressure gas cylinder and the buffer gas cylinder are connected with the combustion chamber shell. The constant pressure in the combustion chamber shell can be realized, and the pressure fluctuation in the combustion chamber shell caused by combustion is effectively reduced; combustion residues generated by combustion of propellant medicine strips and particles dispersed in gas are collected through the collecting liquid and the outlet filter, and the technical problem that complete collection of solid propellant combustion residues is difficult to achieve only through a combustor device is solved. According to the method, the downward moving speed of the push rod is controlled to be equal to the combustion speed of the propellant strip, so that the distance between the propellant strip and the liquid level of the collecting liquid is kept constant, namely, the position of the combustion surface is kept unchanged, and the experiment reliability is further ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of solid propellant combustion, and in particular relates to a system and method for completely collecting solid propellant combustion residues. Background Art

[0002] As the requirements for energy performance and combustion performance of solid propellants become increasingly higher, in order to improve the thrust and specific impulse of solid rocket engines, solid propellant formulas usually contain 15-21% metal particles, such as aluminum powder, aluminum-magnesium alloy, etc. These materials have incomplete combustion, low combustion rate, high ignition temperature and obvious agglomeration during the combustion process, which seriously affects the combustion efficiency of solid propellants, causes secondary flow losses, and causes ablation and abrasion of the engine tail nozzle. Therefore, the collection of combustion residues has an important influence on the analysis of the combustion mechanism of solid propellants and the regulation of combustion performance.

[0003] In the prior art, the disclosed collection devices and collection methods mainly have the following defects: after the propellant strips are burned, a large number of fine particles are dispersed in the gas, and the combustion residues cannot be completely collected; when the propellant strips burn to the bottom, the combustion process is easily affected by the solid inner wall, and the propellant combustion temperature may decrease, or even quenching may occur, making it impossible for the propellant strips to be completely burned. The above defects have led to unclear understanding of the combustion mechanism of solid propellants, difficulty in suppressing particle agglomeration, and difficulty in regulating combustion performance.

[0004] Therefore, there is an urgent need for a system and method for completely collecting solid propellant combustion residues to achieve complete collection of solid propellant combustion residues. Summary of the invention

[0005] In view of the defects and shortcomings of the prior art, the purpose of the present invention is to provide a system and method for completely collecting solid propellant combustion residues, so as to solve the technical problems in the prior art that solid propellants are difficult to achieve complete combustion and the combustion residues are difficult to completely collect.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0007] A solid propellant combustion residue complete collection system, comprising a combustion chamber shell with an observation window, the combustion chamber shell being divided into an upper shell and a lower shell by an end cover arranged in the combustion chamber shell, the upper shell being provided with a mounting cavity, the lower shell being provided with a combustion cavity and a collection cavity, the mounting cavity, the combustion cavity and the collection cavity being connected from top to bottom;

[0008] The combustion chamber is provided with a clamping mechanism and an ignition mechanism, and a propellant strip is provided in the clamping mechanism; the ignition mechanism comprises an ignition column assembly passing through the end cover, and a heating wire arranged at the bottom end of the ignition column assembly, the heating wire is in contact with the bottom surface of the propellant strip, and the heating wire can generate heat to ignite the propellant strip;

[0009] A push rod capable of moving vertically is arranged in the installation cavity, and the lower end of the push rod passes through the end cover and is connected to the propellant strip;

[0010] The collecting chamber is filled with a collecting liquid, and the collecting liquid is used to collect condensed phase products generated by the combustion of the propellant strip;

[0011] The upper shell is also provided with an air inlet and an air outlet, both of which are connected to the combustion chamber; the air inlet is connected to an air inlet pipe, the air outlet is connected to an air outlet pipe, and the air outlet pipe is provided with an outlet filter, which is used to collect fine particles in the smoke generated after the propellant powder sticks are burned.

[0012] The present invention also has the following technical features:

[0013] Specifically, the ignition column assembly includes a first telescopic ignition column and a second telescopic ignition column symmetrically arranged on both sides of the propellant strip, the upper end of the first telescopic ignition column and the upper end of the second telescopic ignition column both extend into the installation cavity through the end cover and are both connected to the power supply; the lower end of the first telescopic ignition column and the lower end of the second telescopic ignition column are respectively connected to the two ends of the heating wire.

[0014] Furthermore, the clamping mechanism includes a push rod base, a fixing plate and a sleeve which are detachably connected from top to bottom, the propellant strip is arranged in the sleeve, and the top surface of the propellant strip can be connected to the bottom surface of the fixing plate.

[0015] Furthermore, the outlet pipe is provided with a first tee, the first tee is connected to a first pipeline and a second pipeline, the first pipeline is also provided with an outlet pressure gauge and an exhaust solenoid valve; the second pipeline is provided with an emergency exhaust valve; the first pipeline and the second pipeline are connected to a muffler and an exhaust treatment device after merging;

[0016] The first pipeline is connected with a first bypass, the first bypass is also connected with a vacuum pump and a buffer gas cylinder respectively through a second three-way connection, and a back pressure valve is arranged on the first bypass.

[0017] Furthermore, a third tee is provided on the air intake pipeline, and the third tee is connected to the high-pressure gas cylinder via a third pipeline and to the air source via a fourth pipeline; an inlet solenoid valve is provided on the third pipeline between the high-pressure gas cylinder and the third tee; a check valve and a front solenoid valve are provided on the fourth pipeline; a buffer solenoid valve is provided on the pipeline between the second tee and the buffer gas cylinder; and a gas washing solenoid valve is provided on the pipeline between the vacuum pump and the second tee.

[0018] Furthermore, an inlet pressure gauge and an inlet filter are also provided on the air intake pipe between the third tee and the air inlet; and a driving device for driving the push rod to move vertically is provided at the top end of the push rod.

[0019] Furthermore, a drain port connected to the collecting chamber is provided at the bottom of the lower shell; an air supply hole and an exhaust hole are provided through the end cover, and the two ends of the air supply hole are respectively connected to the installation chamber and the combustion chamber, and the two ends of the exhaust hole are also respectively connected to the installation chamber and the combustion chamber.

[0020] Furthermore, it also includes a stand, which includes a base, columns vertically arranged on both sides of the base and a flip plate arranged on the top of the column, a mounting hole is opened in the middle of the flip plate, and the upper shell is inserted into the mounting hole; a lifting device is also arranged on the base, and the upper end of the lifting device is connected to the lower shell; the lower end of the lifting device is connected to a slider slidably arranged on the base.

[0021] The present invention also protects a method for completely collecting solid propellant combustion residues, which is implemented by the above-mentioned solid propellant combustion residue complete collection system and comprises the following steps:

[0022] Step 1: Add the collecting liquid into the collecting chamber; stick the propellant strip to the bottom surface of the fixing plate, and remove the sleeve after the propellant strip is firmly bonded; complete the system connection;

[0023] Step 2, close the inlet solenoid valve, the front solenoid valve, the exhaust solenoid valve and the gas washing solenoid valve, adjust the back pressure valve to the set pressure value, open the inlet solenoid valve to send high-pressure gas into the combustion chamber shell, so that the pressure in the combustion chamber shell reaches the set back pressure valve pressure value;

[0024] Step 3, synchronously starting the ignition mechanism and the driving device to ignite the propellant strip; during the combustion of the propellant strip, the distance between the lower end surface of the propellant strip and the surface of the collecting liquid is kept constant;

[0025] Step 4: After the propellant is burned, open the exhaust solenoid valve until the pressure in the combustion chamber shell is equal to the atmospheric pressure; open the front solenoid valve and the gas washing solenoid valve, close the exhaust solenoid valve, and turn on the vacuum pump to make the fine particles dispersed in the gas in the combustion chamber shell gather on the filter membrane of the outlet filter;

[0026] Step 5, open the drain valve to discharge the collected liquid;

[0027] Step 6: Collect the residue in the collected liquid and the fine particles on the filter membrane of the outlet filter to complete the collection of the solid propellant combustion residue.

[0028] Furthermore, in step 2, the speed at which the push rod moves downward is equal to the burning speed of the propellant rod; and the pressure value is 0.1 to 20 MPa.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] (1) The system of the present invention collects the condensed phase products falling into the collecting liquid and the fine particles dispersed in the flue gas after the propellant sticks are burned through structural design, especially through the collection liquid and the filter membrane arranged in the combustion chamber shell, thereby achieving complete collection of the solid propellant combustion residues.

[0031] (2) The method of the present invention can achieve constant pressure in the combustion chamber shell by opening and closing each valve, and effectively reduce the pressure fluctuation in the combustion chamber shell caused by the combustion of the propellant strip.

[0032] (3) The system of the present invention is provided with a lifting device, a slider and a flip plate, so that the disassembly of the system and the installation of the propellant strips are more convenient, thereby improving the operating efficiency of the overall test system.

[0033] (4) The method of the present invention ensures that the distance between the propellant strip and the surface of the collecting liquid remains constant by controlling the downward movement speed of the push rod to be equal to the burning speed of the propellant strip, that is, ensures that the position of the burning surface remains unchanged, thereby ensuring the reliability of the experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall structure of the system of the present invention.

[0035] Figure 2 It is a schematic diagram of the local structure of the system device of the present invention along the main viewing direction;

[0036] Figure 3 It is a schematic diagram of the internal structure of the combustion chamber shell of the system of the present invention along the main viewing direction;

[0037] Figure 4 Schematic diagram of the gas flow inside the combustion chamber shell of the system of the present invention along the left viewing direction;

[0038] Figure 5 It is a schematic diagram of the structure of the clamping mechanism of the system of the present invention.

[0039] The symbols in the figure represent:

[0040] 1-end cover, 2-upper shell, 3-lower shell, 4-clamping mechanism, 5-ignition mechanism, 6-push rod, 7-buffer gas cylinder, 8-first three-way, 9-outlet filter, 10-outlet pressure gauge, 11-exhaust solenoid valve, 12-emergency exhaust valve, 13-muffler, 14-exhaust treatment device, 15-back pressure valve, 16-second three-way, 17-inlet pressure gauge, 18-vacuum pump, 19-third three-way, 20-high-pressure gas cylinder, 21-inlet solenoid valve, 22-check valve, 23-front solenoid valve, 24-buffer solenoid valve, 25-gas washing solenoid valve, 26-inlet filter, 27-driving device, 28-drain port, 29-stand, 30-drain valve;

[0041] 101-air supply hole, 102-air exhaust hole;

[0042] 201-installation cavity, 202-air inlet, 203-air outlet;

[0043] 301-combustion chamber, 302-collection chamber;

[0044] 401-propellant strip, 402-push rod base, 403-fixing plate, 404-sleeve;

[0045] 501-ignition column assembly, 502-heating wire;

[0046] 291-base, 292-column, 293-turning plate, 294-lifting device, 295-slider.

[0047] The specific contents of the present invention are further explained in detail below in conjunction with the accompanying drawings and specific embodiments. DETAILED DESCRIPTION

[0048] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0049] The terms "upper", "lower", "front", "back", "top", "bottom", etc. used in the present invention to indicate directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. "Inside" and "outside" refer to the inside and outside of the contour of the corresponding components, and the above terms should not be understood as limitations on the present invention.

[0050] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0051] In the present invention, unless otherwise specified, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, they can be connected, detachably connected or integrated; they can be mechanically connected or electrically connected; they can be directly connected or indirectly connected through an intermediate medium; they can be internal communication between two elements or an interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] Example 1

[0053] The present embodiment discloses a solid propellant combustion residue complete collection system, comprising a combustion chamber shell with an observation window, through which the combustion process of the propellant powder strip in the combustion chamber shell can be observed. Preferably, a plurality of observation windows can be arranged circumferentially on the combustion chamber shell, and the combustion chamber shell is divided into an upper shell 2 and a lower shell 3 by an end cover 1 arranged in the combustion chamber shell, and an installation cavity 201 is arranged in the upper shell 2, and a combustion cavity 301 and a collection cavity 302 are arranged in the lower shell 3, and the installation cavity 201, the combustion cavity 301 and the collection cavity 302 are connected from top to bottom;

[0054] A clamping mechanism 4 and an ignition mechanism 5 are provided in the combustion chamber 301. A propellant strip 401 is provided in the clamping mechanism 4. The clamping mechanism 4 is used to vertically place the propellant strip 401. The ignition mechanism 5 includes an ignition column assembly 501 penetrating the end cover 1, and a heating wire 502 provided at the bottom end of the ignition column assembly 501. The heating wire 502 is in contact with the bottom surface of the propellant strip 401, and the heating wire 502 can generate heat to ignite the propellant strip 401. The use of the heating wire 502 for ignition can reduce the ignition delay time of the propellant strip 401.

[0055] A push rod 6 capable of moving vertically is disposed in the installation cavity 201, and the lower end of the push rod 6 passes through the end cover 1 and is connected to the upper end of the propellant strip 401; in this embodiment, when the push rod 6 moves downward, it can drive the propellant strip 401 to move downward;

[0056] The collecting chamber 302 is filled with a collecting liquid, which is used to collect the condensed phase products generated by the combustion of the propellant strips 401; the collecting liquid has cooling and flame retardant effects as a cooling medium, and the collecting liquid includes water, liquid nitrogen and cooling oil, which can cool the condensed phase products.

[0057] The upper shell 2 is also provided with an air inlet 202 and an air outlet 203, both of which are connected to the combustion chamber 301; the air inlet 202 is connected to an air inlet pipe, and the air outlet 203 is connected to an air outlet pipe, and an outlet filter 9 is provided on the air outlet pipe, and a filter membrane is provided in the outlet filter 9 for collecting fine particles in the smoke generated after the propellant strip 401 is burned.

[0058] In this embodiment, the filter membrane is made of high-purity quartz fiber filter membrane, which can capture fine particles below 0.3 μm, and the capture rate can reach 99.998%. The outlet filter 9 is used to collect fine particles dispersed in the gas in the combustion chamber shell after the propellant strip 401 is burned.

[0059] As a preferred scheme of this embodiment, the ignition column assembly 501 includes a first telescopic ignition column and a second telescopic ignition column symmetrically arranged on both sides of the propellant strip 401. The lengths of the first telescopic ignition column and the second telescopic ignition column are adjustable, and the distance between the ignition wire 502 and the top of the collecting liquid can be adjusted by adjusting the heights of the first telescopic ignition column and the second telescopic ignition column. The upper ends of the first telescopic ignition column and the second telescopic ignition column are both extended into the installation cavity 201 through the end cover 1 and are both connected to a DC power supply; the lower end of the first telescopic ignition column and the lower end of the second telescopic ignition column are respectively connected to the two ends of the heating wire 502.

[0060] As a preferred solution of this embodiment, Figure 4 As shown, the clamping mechanism 4 includes a push rod base 402, a fixing plate 403 and a sleeve 404 which are detachably connected from top to bottom. A propellant strip 401 is arranged in the sleeve 404, and the top surface of the propellant strip 401 is connected to the bottom surface of the fixing plate 403.

[0061] In this embodiment, the push rod base 402 and the fixing plate 403 are connected by a clamping method, or by a threaded connection, and the fixing plate 403 and the sleeve 404 are connected by screws. The fixing plate 403 is made of a material with a small thermal conductivity, such as ceramic, glass, plastic or rubber, to reduce heat loss and enable the propellant strip 401 to burn completely. The fixing plate 403 and the propellant strip 401 are bonded by glue.

[0062] As a preferred solution of this embodiment, a first tee 8 is provided on the outlet pipe, a first pipeline and a second pipeline are connected to the first tee 8, an outlet pressure gauge 10 and an exhaust solenoid valve 11 are also provided on the first pipeline; an emergency exhaust valve 12 is provided on the second pipeline; the first pipeline and the second pipeline are connected to a muffler 13 and an exhaust gas treatment device 14 after merging;

[0063] The first pipeline is connected with a first bypass, which is also connected to a vacuum pump 18 and a buffer gas cylinder 7 through a second three-way 16, and a back pressure valve 15 is also provided on the first bypass. The buffer gas cylinder 7 is used to buffer the expansion pressure generated instantly when the propellant strip 401 burns.

[0064] As a preferred solution of this embodiment, a third tee 19 is provided on the air intake pipeline, and the third tee 19 is connected to the high-pressure gas cylinder 20 via the third pipeline and to the air source via the fourth pipeline; an inlet solenoid valve 21 is provided on the third pipeline between the high-pressure gas cylinder 20 and the third tee 19; a check valve 22 and a pre-solenoid valve 23 are provided on the fourth pipeline; a buffer solenoid valve 24 is provided on the pipeline between the second tee 16 and the buffer gas cylinder 7; and a gas washing solenoid valve 25 is provided on the pipeline between the vacuum pump 18 and the second tee 16.

[0065] The high-pressure gas cylinder 20 is used to provide an inert gas pressure environment in the combustion chamber 301. As a preferred embodiment, the gas in the high-pressure gas cylinder 20 can be an inert gas such as nitrogen, helium, argon, etc.; the buffer gas cylinder 7 is used to buffer the instantaneous pressure expansion caused by the combustion of the propellant strip, to avoid damage to the combustion chamber 301 and the pipeline connected to the combustion chamber 301 due to instantaneous pressure shock, and to ensure the safety of the collection system and test personnel; the imported solenoid valve 21 is used to control the gas output of the high-pressure gas cylinder 20; the check valve 22 is used to control the direction of the airflow. When the front solenoid valve 23 and the vacuum pump 18 are opened, air can enter the combustion chamber shell and flow in the direction of the vacuum pump 18, to avoid the front solenoid valve 4 being opened at the moment when the pressure in the combustion chamber 301 is greater than the ambient air The pressure causes a backflow; the front solenoid valve 23 is used to connect the ambient air to the air inlet 202 through a pipeline; the vacuum pump 18 is used to provide power for the gas flow after the propellant cartridge 401 is burned and the combustion chamber 301 is depressurized, so that the ambient air enters the combustion chamber shell from the air inlet 202, and drives the fine particles dispersed in the gas in the combustion chamber shell to gather on the filter membrane of the outlet filter 9; when the propellant cartridge is burned and the combustion chamber 301 is depressurized, the high-pressure gas in the pipeline can be blocked from flowing through the vacuum pump 18 to cause damage to it by controlling the gas washing solenoid valve 25, and when the exhaust solenoid valve 11 is closed and the vacuum pump 18 is turned on, the gas washing solenoid valve 25 can control the gas in the system pipeline to flow from the combustion chamber 301 to the vacuum pump 18.

[0066] The back pressure valve 15 is used to control the pressure value of the combustion chamber and the entire system pipeline. When the entire system does not reach the set pressure value, the back pressure valve 15 remains closed. When the entire system exceeds the set pressure value, the back pressure valve 15 automatically opens to discharge gas.

[0067] As a preferred solution of this embodiment, an inlet pressure gauge 17 and an inlet filter 26 are further provided on the air intake pipe between the third three-way valve 19 and the air intake port 202; a driving device 27 for driving the push rod 6 to move vertically is provided at the top of the push rod 6. The inlet filter 26 is used to ensure that the gas entering the combustion chamber housing is pure and free of impurities and particles.

[0068] As a preferred solution of this embodiment, a drain port 28 connected to the collecting chamber 302 is provided at the bottom of the lower shell body 3, and a drain valve 30 is provided on the drain port 28; an air supply hole 101 and an exhaust hole 102 are provided through the end cover 1, and the two ends of the air supply hole 101 are respectively connected to the installation chamber 201 and the combustion chamber 301, and the two ends of the exhaust hole 102 are also respectively connected to the installation chamber 201 and the combustion chamber 301.

[0069] As a preferred solution of this embodiment, it also includes a stand 29, which includes a base 291, columns 292 vertically arranged on both sides of the base 291 and a flip plate 293 arranged on the top of the column 292, and a mounting hole is opened in the middle of the flip plate 293, and the upper shell 2 is inserted into the mounting hole; a lifting device 294 is also arranged on the base 291, and the upper end of the lifting device 294 is connected to the lower shell 3; the lower end of the lifting device 294 is connected to a slider 295 slidably arranged on the base 291.

[0070] The lifting device 294 can be used to displace the combustion chamber shell in the vertical direction; the slider 295 can be used to move the combustion chamber shell in the horizontal direction; the flip plate 293 can be used to flip the ignition device mechanism 5, the clamping mechanism 4, the end cover 2, the push rod 6 and other components in the system within the range of 0 to 120 degrees, which is convenient for disassembly of the system and installation of the propellant strip.

[0071] When assembling the system of the present invention: add 5L of liquid nitrogen as the collecting liquid into the collecting chamber; remove the end cover 1, adjust the position of the lifting device 294 and the slider 295, stick the propellant strip 401 to the fixing plate 403, and fix the propellant strip 401 with the sleeve 404, and the top surface of the fixing plate 403 is connected to the push rod 6; after the propellant strip 401 is firmly fixed, remove the sleeve 404, cover the end cover 1, and then complete the connection between the combustion chamber shell and other components in the system.

[0072] Example 2

[0073] This embodiment discloses a method for completely collecting solid propellant combustion residues. The method is implemented by the solid propellant combustion residue complete collection system disclosed in Embodiment 1, and comprises the following steps:

[0074] Step 1, add the collecting liquid into the collecting chamber; stick the propellant strip 401 to the bottom surface of the fixing plate 403, and remove the sleeve 404 after the propellant strip 401 is firmly bonded; complete the system connection;

[0075] Step 2, manually set the pressure value of the back pressure valve 15 to 0.1-20 MPa, close the front solenoid valve 23, the exhaust solenoid valve 11 and the gas washing solenoid valve 25, open the inlet solenoid valve 21, allow the high-pressure gas to enter the combustion chamber shell, and make the pressure in the combustion chamber shell reach the set pressure value of 0.1-20 MPa;

[0076] Step 3, synchronously start the ignition mechanism 5 and the driving device 27 to ignite the propellant strip 401; during the combustion of the propellant strip 401, the driving device 27 drives the push rod 6 to move downward, thereby driving the propellant strip 401 to move downward; during the combustion of the propellant strip, the distance between the lower end surface of the propellant strip and the liquid surface of the collection liquid is kept constant;

[0077] As the propellant strip 401 burns, the push rod 6 moves downward under the drive device 27, and the movement speed of the push rod 6 is equal to the burning speed of the propellant strip 401, and the working time is equal to the burning time of the propellant strip 401. The downward movement of the push rod 6 compensates for the increase in the distance between the propellant strip 401 and the liquid surface caused by the burning surface, that is, it ensures that the position of the burning surface remains unchanged. The agglomerated particles produced after combustion are quickly cooled and frozen by the collection liquid.

[0078] Step 4: After the propellant strip 401 is burned, the exhaust solenoid valve 11 is opened until the pressure in the combustion chamber shell is equal to the atmospheric pressure; the pre-solenoid valve 23 and the gas washing solenoid valve 25 are opened, the exhaust solenoid valve 11 is closed, and the vacuum pump 18 is turned on to make the fine particles dispersed in the gas in the combustion chamber shell gather on the filter membrane of the outlet filter 9;

[0079] Step 5, open the drain valve 30 to discharge the collected liquid;

[0080] Step 6: Collect the residue in the collected liquid and the fine particles on the filter membrane of the outlet filter 9 to complete the collection of the solid propellant combustion residue.

[0081] As a preferred solution of this embodiment, the speed at which the push rod 6 moves downward is equal to the burning speed of the propellant strip 401, and the speed at which the push rod 6 moves downward is less than 50 mm / s. By controlling the speed at which the push rod 6 moves downward to be equal to the burning speed of the propellant strip 401, it is possible to ensure that during the combustion process, a constant distance is maintained between the lower end surface of the propellant strip 401 and the surface of the collected liquid, and the distance in this embodiment is 10 mm.

[0082] In this embodiment, the gas flow in the system includes the following stages:

[0083] (1) Gas pressurization stage before combustion: open the high-pressure gas cylinder 20 and the inlet solenoid valve 21, and close the front solenoid valve 23, the exhaust solenoid valve 11 and the gas washing solenoid valve 25. At this time, the gas starts from the high-pressure gas cylinder 20 and flows through the inlet filter 26, the combustion chamber air inlet 202, the installation cavity 201, the combustion chamber 301, the gas outlet 203, the outlet filter 9, the back pressure valve 15 and the muffler 13 to enter the exhaust gas treatment device 14;

[0084] (2) Gas expansion stage during combustion: the buffer solenoid valve 24 is opened, and the inlet solenoid valve 21, the front solenoid valve 23, the exhaust solenoid valve 11 and the gas washing solenoid valve 25 are closed. At this time, the expansion gas generated by the combustion is discharged through the gas outlet 203, and after flowing through the outlet filter 9, a part of the gas flows through the buffer solenoid valve 24 to the buffer gas cylinder 7, and the other part of the gas flows through the back pressure valve 15 and the muffler 13 to enter the exhaust gas treatment device 14;

[0085] (3) Pressure relief stage after combustion: the exhaust solenoid valve 11 and the buffer solenoid valve 24 are opened, and the inlet solenoid valve 21, the front solenoid valve 23 and the gas washing solenoid valve 25 are closed. At this time, a part of the gas is discharged through the gas outlet 203, and enters the exhaust gas treatment device 14 through the outlet filter 9, the exhaust solenoid valve 11 and the muffler 13 in sequence; the other part of the gas starts from the buffer gas cylinder 7, and enters the exhaust gas treatment device 14 through the buffer solenoid valve 24, the exhaust solenoid valve 11 and the muffler 13 in sequence;

[0086] (4) Gas washing stage after combustion: open the front solenoid valve 23, the gas washing solenoid valve 25 and the vacuum pump 18, and close the inlet solenoid valve 21, the exhaust solenoid valve 11 and the buffer solenoid valve 24. At this time, air flows through the front solenoid valve 23, the check valve 22, the inlet filter 26, the air inlet 202, the installation cavity 201, the combustion cavity 301, the air outlet 230, the outlet filter 9, the gas washing solenoid valve 25 and the vacuum pump 18.

[0087] In summary, the method of the present invention can achieve constant pressure in the combustion chamber shell by opening and closing each valve; effectively reduce the pressure fluctuation in the combustion chamber shell caused by the combustion of the propellant strip, and ensure that the distance between the propellant strip and the surface of the collecting liquid remains constant by controlling the downward movement speed of the push rod to be equal to the combustion speed of the propellant strip, that is, ensure that the position of the combustion surface remains unchanged, thereby ensuring the reliability of the experiment.

[0088] The various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A solid propellant combustion residue complete collection system, comprising a combustion chamber shell with an observation window, wherein the combustion chamber shell is divided into an upper shell (2) and a lower shell (3) by an end cover (1) arranged in the combustion chamber shell, characterized in that: The upper shell (2) is provided with a mounting chamber (201), and the lower shell (3) is provided with a combustion chamber (301) and a collection chamber (302); the mounting chamber (201), the combustion chamber (301) and the collection chamber (302) are connected from top to bottom; A clamping mechanism (4) and an ignition mechanism (5) are arranged in the combustion chamber (301), and a propellant strip (401) is arranged in the clamping mechanism (4); the ignition mechanism (5) comprises an ignition column assembly (501) inserted into the end cover (1), and a heating wire (502) arranged at the bottom end of the ignition column assembly (501), the heating wire (502) is in contact with the bottom surface of the propellant strip (401), and the heating wire (502) can generate heat to ignite the propellant strip (401); A push rod (6) capable of moving vertically is arranged in the installation cavity (201), and the lower end of the push rod (6) passes through the end cover (1) and is connected to the propellant strip (401); The collecting chamber (302) is filled with a collecting liquid, and the collecting liquid is used to collect condensed phase products generated by the combustion of the propellant strip (401); The upper shell (2) is also provided with an air inlet (202) and an air outlet (203), both of which are in communication with the combustion chamber (301); the air inlet (202) is connected to an air inlet pipe, the air outlet (203) is connected to an air outlet pipe, and an outlet filter (9) is provided on the air outlet pipe, and the outlet filter (9) is used to collect fine particles in the smoke generated after the propellant strip (401) is burned.

2. The solid propellant combustion residue complete collection system according to claim 1, characterized in that: The ignition column assembly (501) comprises a first telescopic ignition column and a second telescopic ignition column symmetrically arranged on both sides of the propellant strip (401); the upper end of the first telescopic ignition column and the upper end of the second telescopic ignition column are both extended into the installation cavity (201) through the end cover (1) and are both connected to the power supply; the lower end of the first telescopic ignition column and the lower end of the second telescopic ignition column are respectively connected to the two ends of the heating wire (502).

3. The solid propellant combustion residue complete collection system according to claim 1, characterized in that: The clamping mechanism (4) comprises a push rod base (402), a fixing plate (403) and a sleeve (404) which are detachably connected from top to bottom, the propellant strip (401) is arranged in the sleeve (404), and the top surface of the propellant strip (401) can be connected to the bottom surface of the fixing plate (403).

4. The solid propellant combustion residue complete collection system according to claim 1, characterized in that: The outlet pipeline is provided with a first tee (8), the first tee (8) is connected to a first pipeline and a second pipeline, the first pipeline is also provided with an outlet pressure gauge (10) and an exhaust solenoid valve (11); the second pipeline is provided with an emergency exhaust valve (12); the first pipeline and the second pipeline are connected to a muffler (13) and an exhaust gas treatment device (14) after merging; The first pipeline is connected to a first bypass, the first bypass is also connected to a vacuum pump (18) and a buffer gas cylinder (7) via a second tee (16), and a back pressure valve (15) is provided on the first bypass.

5. The solid propellant combustion residue complete collection system according to claim 4, characterized in that: The air intake pipeline is provided with a third three-way connection (19), the third three-way connection (19) is connected to a high-pressure gas cylinder (20) via a third pipeline and is connected to an air source via a fourth pipeline; an inlet solenoid valve (21) is provided on the third pipeline between the high-pressure gas cylinder (20) and the third three-way connection (19); a check valve (22) and a front solenoid valve (23) are provided on the fourth pipeline; a buffer solenoid valve (24) is provided on the pipeline between the second three-way connection (16) and the buffer gas cylinder (7); and a gas washing solenoid valve (25) is provided on the pipeline between the vacuum pump (18) and the second three-way connection (16).

6. The solid propellant combustion residue complete collection system according to claim 5, characterized in that: An inlet pressure gauge (17) and an inlet filter (26) are also provided on the air intake pipe between the third tee (19) and the air intake port (202); and a driving device (27) for driving the push rod (6) to move vertically is provided at the top end of the push rod (6).

7. The solid propellant combustion residue complete collection system according to claim 1, characterized in that: The bottom of the lower shell (3) is provided with a liquid discharge port (28) connected to the collecting chamber (302), and a liquid discharge valve (30) is provided on the liquid discharge port (28); the end cover (1) is provided with an air supply hole (101) and an air exhaust hole (102), the two ends of the air supply hole (101) are respectively connected to the installation chamber (201) and the combustion chamber (301), and the two ends of the air exhaust hole (101) are also respectively connected to the installation chamber (201) and the combustion chamber (301).

8. The solid propellant combustion residue complete collection system according to claim 1, characterized in that: The invention also comprises a stand (29), wherein the stand (29) comprises a base (291), columns (292) vertically arranged on both sides of the base (291), and a flip plate (293) arranged at the top of the column (292); a mounting hole is provided in the middle of the flip plate (293), and the upper shell (2) is inserted into the mounting hole; a lifting device (294) is also provided on the base (291), and the upper end of the lifting device (294) is connected to the lower shell (3); and the lower end of the lifting device (294) is connected to a slider (295) slidably arranged on the base (291).

9. A method for completely collecting solid propellant combustion residues, characterized in that: The method is implemented by a solid propellant combustion residue complete collection system according to any one of claims 1 to 8, comprising the following steps: Step 1, adding a collecting liquid into the collecting chamber (302); sticking the propellant strip (401) to the bottom surface of the fixing plate (403), removing the sleeve (404) after the propellant strip (401) is firmly bonded, and then completing the system connection; Step 2, closing the inlet solenoid valve (21), the front solenoid valve (23), the exhaust solenoid valve (11) and the gas washing solenoid valve (25), adjusting the back pressure valve (15) to a set pressure value, opening the inlet solenoid valve (21) to feed high-pressure gas into the combustion chamber shell, so that the pressure in the combustion chamber shell reaches the set back pressure valve pressure value; Step 3, synchronously starting the ignition mechanism (5) and the driving device (27) to ignite the propellant strip (401); during the combustion of the propellant strip (401), the distance between the lower end surface of the propellant strip (401) and the liquid surface of the collection liquid is kept constant; Step 4: After the propellant strip (401) is burned, the exhaust solenoid valve (11) is opened until the pressure in the combustion chamber shell is equal to the atmospheric pressure; the front solenoid valve (23) and the gas washing solenoid valve (25) are opened, the exhaust solenoid valve (11) is closed, and the vacuum pump (18) is turned on to allow the fine particles dispersed in the gas in the combustion chamber shell to gather on the filter membrane of the outlet filter (9); Step 5, opening the drain valve (30) to discharge the collected liquid; Step 6: Collect the residue in the collected liquid and the fine particles on the filter membrane of the outlet filter (9), thereby completing the collection of the solid propellant combustion residue.

10. The method for completely collecting solid propellant combustion residues according to claim 9, characterized in that: In step 2, the speed at which the push rod (6) moves downward is equal to the burning speed of the propellant strip (401); and the pressure value is 0.1 to 20 MPa.

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