Solid propellant combustion residue complete collection system and method

Abstract

The application discloses a solid propellant combustion residue complete collection system and method, which comprises a combustion chamber shell, an ignition mechanism arranged in the combustion chamber shell, a clamping mechanism, and a high-pressure gas cylinder and a buffer gas cylinder connected with the combustion chamber shell. The application can realize the constant of the pressure in the combustion chamber shell by reasonably adjusting the opening and closing of each electromagnetic valve in the system, effectively reduces the pressure fluctuation in the combustion chamber shell caused by combustion, realizes the collection of the combustion residue generated by the combustion of the propellant strip and the particles dispersed in the gas through the set collection liquid and outlet filter, and solves the technical problem that the complete collection of the solid propellant combustion residue is difficult to be realized only by relying on the burner device. The method of the application ensures that the distance between the propellant strip and the liquid surface of the collection liquid remains constant by controlling the speed of the push rod moving downward to be equal to the combustion speed of the propellant strip, that is, ensures that the combustion surface position remains unchanged, and further ensures the reliability of the experiment.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of solid propellant combustion, and particularly relates to a solid propellant combustion residue complete collection system and method. BACKGROUND

[0002] With the increasing requirements of solid propellant on energy performance and combustion performance, in order to improve the thrust and specific impulse of solid rocket engine, 15-21% of metal particles such as aluminum powder and aluminum-magnesium alloy are usually contained in the solid propellant formula. Such materials have the phenomena of incomplete combustion, low combustion rate, high ignition temperature and obvious agglomeration in the combustion process, which seriously affect the combustion efficiency of the solid propellant, cause secondary flow loss, and cause erosion and abrasion of the engine tail nozzle. Therefore, the collection of combustion residues has an important influence on the analysis of solid propellant combustion mechanism and the regulation of combustion performance.

[0003] In the prior art, the existing collection devices and collection methods mainly have the following defects: a large number of fine particles dispersed in the gas after the propellant grain burns, and the complete collection of combustion residues cannot be achieved; when the propellant grain burns to the bottom, the combustion process is easily affected by the solid inner wall, which may cause the combustion temperature of the propellant to decrease, and even quenching phenomenon occurs, so that the propellant grain cannot be completely burned. The above defects lead to unclear understanding of the solid propellant combustion mechanism, difficult inhibition of particle agglomeration, and difficult regulation of combustion performance.

[0004] Therefore, there is an urgent need for a solid propellant combustion residue complete collection system and method to achieve complete collection of solid propellant combustion residues. SUMMARY

[0005] In view of the defects and deficiencies of the prior art, the purpose of the present application is to provide a solid propellant combustion residue complete collection system and method to solve the technical problems of incomplete combustion of solid propellant and difficult complete collection of combustion residues in the prior art.

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

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

[0008] The combustion cavity is provided with a clamping mechanism and an ignition mechanism, the clamping mechanism is provided with a propellant strip, the ignition mechanism comprises an ignition column assembly penetrating the end cover and an electric heating wire arranged at the bottom end of the ignition column assembly, the electric heating wire is attached to the bottom surface of the propellant strip, and the electric heating wire can heat and ignite the propellant strip.

[0009] The installation cavity is provided with a push rod capable of moving vertically, the lower end of the push rod penetrates the end cover and is connected to the propellant strip.

[0010] The collection cavity is filled with a collection liquid for collecting condensed phase products generated by combustion of the propellant strip.

[0011] The upper shell is also provided with an air inlet and an air outlet, the air inlet and the air outlet are communicated with the combustion cavity, the air inlet is connected with an air inlet pipeline, the air outlet is connected with an air outlet pipeline, and the air outlet pipeline is provided with an outlet filter for collecting fine particulate matters in flue gas generated after combustion of the propellant strip.

[0012] The application also has the following technical features:

[0013] Specifically, the ignition column assembly comprises first and second telescopic ignition columns symmetrically arranged on both sides of the propellant strip, the upper ends of the first and second telescopic ignition columns penetrate the end cover and are connected to the power supply, and the lower ends of the first and second telescopic ignition columns are connected to the two ends of the electric heating wire.

[0014] Further, the clamping mechanism comprises a push rod base, a fixed 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 is connected to the bottom surface of the fixed plate.

[0015] Further, the air outlet pipeline is provided with a first three-way joint, the first three-way joint is connected with a first pipeline and a second pipeline, the first pipeline is further provided with an outlet pressure gauge and an exhaust electromagnetic valve, the second pipeline is provided with an emergency exhaust valve, and the first pipeline and the second pipeline are connected to a silencer and an exhaust treatment device after being merged.

[0016] The first pipeline is connected with a first bypass, the first bypass is further connected to a vacuum pump and a buffer gas cylinder through a second three-way joint, and the first bypass is provided with a back pressure valve.

[0017] Further, the third three-way valve is provided on the air inlet pipeline, and the third three-way valve is connected with a high-pressure gas cylinder through a third pipeline and connected with an air source through a fourth pipeline, and an inlet electromagnetic valve is arranged on the third pipeline between the high-pressure gas cylinder and the third three-way valve; a check valve and a pre-electromagnetic valve are arranged on the fourth pipeline; a buffer electromagnetic valve is arranged on the pipeline between the second three-way valve and the buffer gas cylinder; a gas washing electromagnetic valve is arranged on the pipeline between the vacuum pump and the second three-way valve.

[0018] Further, an inlet pressure gauge and an inlet filter are further arranged on the air inlet pipeline between the third three-way valve and the air inlet; and a driving device for driving the push rod to move vertically is arranged at the top end of the push rod.

[0019] Further, the bottom of the lower shell is provided with a liquid discharge port communicated with the collecting cavity; and the end cover is provided with a gas feeding hole and a gas discharge hole, and the two ends of the gas feeding hole are respectively communicated with the mounting cavity and the combustion cavity, and the two ends of the gas discharge hole are also respectively connected with the mounting cavity and the combustion cavity.

[0020] Further, the device further comprises a rack, and the rack comprises a base, vertical columns arranged on both sides of the base, and a turnover plate arranged at the top end of the vertical columns, and the turnover plate is provided with a mounting hole in the middle, and the upper shell is arranged in the mounting hole; the base is further provided with a lifting device, and the upper end of the lifting device is connected with the lower shell; and the lower end of the lifting device is connected with a sliding block arranged on the base in a sliding mode.

[0021] The application also protects a solid propellant combustion residue complete collection method, and the method is realized by the above-mentioned solid propellant combustion residue complete collection system and comprises the following steps.

[0022] Step 1, adding a collecting liquid in the collecting cavity; sticking the propellant stick on the bottom surface of the fixed plate, and taking off the sleeve after the propellant stick is firmly bonded; and completing system connection;

[0023] Step 2, closing the inlet electromagnetic valve, the pre-electromagnetic valve, the gas discharge electromagnetic valve and the gas washing electromagnetic valve, adjusting the back pressure valve to a set pressure value, opening the inlet electromagnetic valve to send high-pressure gas into the combustion chamber shell, and making the pressure in the combustion chamber shell reach the pressure value of the set back pressure valve;

[0024] Step 3, synchronously starting the ignition mechanism and the driving device, and igniting the propellant stick; and keeping the distance between the lower end surface of the propellant stick and the liquid level of the collecting liquid constant during the combustion process of the propellant stick;

[0025] Step 4, after the combustion of the propellant stick is completed, opening the gas discharge electromagnetic valve until the pressure in the combustion chamber shell is equal to the atmospheric pressure; opening the pre-electromagnetic valve and the gas washing electromagnetic valve, closing the gas discharge electromagnetic valve, and opening the vacuum pump, so that the fine particulate matters dispersed in the gas in the combustion chamber shell are gathered on the filter membrane of the outlet filter.

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

[0027] Step 6, collect the residue in the collection liquid and the fine particles on the filter membrane of the outlet filter, and complete the collection of the solid propellant combustion residue.

[0028] Further, in the step 2, the speed of the downward movement of the push rod is equal to the combustion speed of the propellant stick; and the pressure value is 0.1-20 MPa.

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

[0030] (1) The system of the present application realizes the complete collection of the solid propellant combustion residue by collecting the condensed phase products falling into the collection liquid and the fine particles dispersed in the flue gas after the combustion of the propellant stick through the structural design, especially through the collection liquid and the filter membrane arranged in the combustion chamber shell.

[0031] (2) The method of the present application realizes the constant pressure in the combustion chamber shell through the opening and closing of each valve, and effectively reduces the pressure fluctuation in the combustion chamber shell caused by the combustion of the propellant stick.

[0032] (3) The system of the present application is more convenient for disassembly and installation of the propellant stick through the arrangement of the lifting device, the sliding block and the turnover plate, and improves the operation efficiency of the overall test system.

[0033] (4) The method of the present application ensures the constant distance between the propellant stick and the liquid surface of the collection liquid by controlling the speed of the downward movement of the push rod to be equal to the combustion speed of the propellant stick, that is, ensures the constant combustion surface position, and further ensures the reliability of the experiment. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is the overall structure schematic diagram of the system of the present application.

[0035] Figure 2 is the local structure schematic diagram of the system device of the present application along the front direction;

[0036] Figure 3 is the internal structure schematic diagram of the combustion chamber shell of the system of the present application along the front direction;

[0037] Figure 4 is the internal gas flow schematic diagram of the combustion chamber shell of the system of the present application along the left direction;

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

[0039] The various reference signs in the drawings 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 joint, 9-outlet filter, 10-outlet pressure gauge, 11-exhaust electromagnetic valve, 12-emergency exhaust valve, 13-silencer, 14-tail gas treatment device, 15-back pressure valve, 16-second three-way joint, 17-inlet pressure gauge, 18-vacuum pump, 19-third three-way joint, 20-high pressure gas cylinder, 21-inlet electromagnetic valve, 22-check valve, 23-prevalve, 24-buffer electromagnetic valve, 25-gas washing electromagnetic valve, 26-inlet filter, 27-driving device, 28-drainage port, 29-stand, 30-drainage valve;

[0041] 101-gas feeding hole, 102-gas exhaust hole;

[0042] 201-mounting cavity, 202-gas inlet, 203-gas outlet;

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

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

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

[0046] 291-base, 292-stand, 293-flip plate, 294-lifting device, 295-sliding block.

[0047] The specific content of the present application is further explained in detail in combination with the drawings and specific embodiments. DETAILED DESCRIPTION

[0048] The following gives specific embodiments of the present application, it should be noted that the present application is not limited to the following specific embodiments, any equivalent transformation made on the basis of the technical scheme of the present application falls within the protection scope of the present application.

[0049] The terms "upper", "lower", "front", "rear", "top", "bottom" and the like used in the present application indicate the orientation or positional relationship only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, "inner", "outer" refers to the inner and outer of the corresponding part contour, the above terms should not be understood as a limitation on the present application.

[0050] In addition, the ordinal numbers such as "first", "second" and the like are used only for descriptive purpose and cannot be understood as indicating or implying relative importance or implying the number of the technical features indicated. Thus, the features defined with "first", "second" can explicitly or implicitly include one or more of the features.

[0051] In the present application, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense unless otherwise specified, for example, it can be connected, or detachable or integrated; it can be mechanical connection or electrical connection; it can be directly connected or indirectly connected through intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0052] Embodiment 1

[0053] The present embodiment discloses a solid propellant combustion residue complete collection system, which comprises a combustion chamber shell with an observation window, through which the combustion process of the propellant stick in the combustion chamber shell can be observed. As preferred, a plurality of observation windows can be arranged circumferentially on the combustion chamber shell. 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. The upper shell 2 is provided with a mounting cavity 201, and the lower shell 3 is provided with a combustion cavity 301 and a collection cavity 302. The mounting cavity 201, the combustion cavity 301 and the collection cavity 302 are communicated from top to bottom.

[0054] The combustion cavity 301 is provided with a clamping mechanism 4 and an ignition mechanism 5. The clamping mechanism 4 is provided with a propellant stick 401, and is used for vertically placing the propellant stick 401. The ignition mechanism 5 comprises an ignition column assembly 501 arranged in the end cover 1, and an electric heating wire 502 arranged at the bottom end of the ignition column assembly 501. The electric heating wire 502 is attached to the bottom surface of the propellant stick 401, and can heat and ignite the propellant stick 401. The use of the electric heating wire 502 for ignition can reduce the ignition delay time of the propellant stick 401.

[0055] The mounting cavity 201 is provided with a push rod 6 which can move vertically. The lower end of the push rod 6 passes through the end cover 1 and is connected to the upper end of the propellant stick 401. In the present embodiment, the downward movement of the push rod 6 can drive the propellant stick 401 to move downward.

[0056] The collection cavity 302 is filled with a collection liquid, which is used to collect the condensed phase products generated by the combustion of the propellant stick 401. The collection liquid has cooling and fire-retardant effect as a cooling medium, and can cool the condensed phase products. The collection liquid comprises water, liquid nitrogen and cooling oil.

[0057] The upper shell 2 is further provided with an air inlet 202 and an air outlet 203, both of which are communicated with the combustion chamber 301; the air inlet 202 is connected with an air inlet pipeline, and the air outlet 203 is connected with an air outlet pipeline, which is provided with an outlet filter 9 having a filter membrane for collecting fine particles in the smoke generated after the combustion of the propellant stick 401.

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

[0059] As a preferred scheme of this embodiment, the ignition column assembly 501 includes first and second telescopic ignition columns symmetrically arranged on both sides of the propellant stick 401. The lengths of the first and second telescopic ignition columns can be adjusted, and the distance between the ignition wire 502 and the surface of the collection liquid can be adjusted by adjusting the heights of the first and second telescopic ignition columns. The upper ends of the first and second telescopic ignition columns are inserted into the mounting cavity 201 through the end cover 1 and are connected with the direct current power supply. The lower ends of the first and second telescopic ignition columns are connected with the two ends of the electric heating wire 502.

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

[0061] In this embodiment, the push rod base 402 and the fixed plate 403 are connected in a clamping manner, and can also be connected in a threaded manner. The fixed plate 403 and the sleeve 404 are connected by means of screws. The fixed 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 stick 401 to be completely combusted. The fixed plate 403 is bonded to the propellant stick 401 by glue.

[0062] As a preferred scheme of this embodiment, the air outlet pipeline is provided with a first three-way pipe 8, and the first three-way pipe 8 is connected with a first pipeline and a second pipeline. The first pipeline is further provided with an outlet pressure gauge 10 and an exhaust electromagnetic valve 11. The second pipeline is provided with an emergency exhaust valve 12. The first pipeline and the second pipeline are connected with a muffler 13 and an exhaust treatment device 14 after being merged.

[0063] The first pipeline is connected with a first bypass, the first bypass is further connected with a vacuum pump 18 and a buffer gas cylinder 7 through a second three-way joint 16, and a back pressure valve 15 is arranged on the first bypass. The buffer gas cylinder 7 is used for buffering the expansion gas pressure generated instantaneously when the propellant strip 401 is burned.

[0064] As a preferred scheme of the embodiment, a third three-way joint 19 is arranged on the air inlet pipeline, the third three-way joint 19 is connected with a high-pressure gas cylinder 20 through a third pipeline and connected with an air source through a fourth pipeline, an inlet electromagnetic valve 21 is arranged on the third pipeline between the high-pressure gas cylinder 20 and the third three-way joint 19; a check valve 22 and a pre-positioned electromagnetic valve 23 are arranged on the fourth pipeline; a buffer electromagnetic valve 24 is arranged on the pipeline between the second three-way joint 16 and the buffer gas cylinder 7; and a gas washing electromagnetic valve 25 is arranged on the pipeline between the vacuum pump 18 and the second three-way joint 16.

[0065] The high-pressure gas cylinder 20 is used for providing an inert gas pressure environment in the combustion chamber 301. As a preferred scheme, the gas in the high-pressure gas cylinder 20 can be nitrogen, helium, argon or other inert gas. The buffer gas cylinder 7 is used for buffering the instantaneous pressure expansion generated by the burning of the propellant strip, avoiding damage to the combustion chamber 301 and the pipeline connected with the combustion chamber 301 due to the instantaneous pressure impact, and ensuring the safety of the collection system and the test personnel. The inlet electromagnetic valve 21 is used for controlling the gas output of the high-pressure gas cylinder 20. The check valve 22 is used for controlling the direction of gas flow. When the pre-positioned electromagnetic valve 23 and the vacuum pump 18 are opened, the air can enter the combustion chamber shell and flow towards the vacuum pump 18, avoiding backflow due to the fact that the pressure in the combustion chamber 301 is greater than the ambient air pressure when the pre-positioned electromagnetic valve 4 is opened instantaneously. The pre-positioned electromagnetic valve 23 is used for connecting the ambient air through the pipeline and the air inlet 202. The vacuum pump 18 is used for providing power for gas flow after the burning of the propellant strip 401 is completed and the combustion chamber 301 is depressurized, so that the ambient air enters the combustion chamber shell from the air inlet 202, and the fine particulate matter dispersed in the gas in the combustion chamber shell is driven to gather on the filter membrane of the outlet filter 9. When the propellant strip is burned and the combustion chamber 301 is depressurized, the gas washing electromagnetic valve 25 can be controlled to block the high-pressure gas in the pipeline from flowing through the vacuum pump 18 and causing damage to the vacuum pump 18. When the exhaust electromagnetic valve 11 is closed and the vacuum pump 18 is opened, the gas washing electromagnetic valve 25 can control the gas in the system pipeline to flow from the combustion chamber 301 to the direction of the vacuum pump 18.

[0066] The back pressure valve 15 is used for controlling 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 in a closed state. When the entire system exceeds the set pressure value, the back pressure valve 15 automatically opens to discharge the gas.

[0067] As a preferred scheme of the embodiment, an inlet pressure gauge 17 and an inlet filter 26 are further arranged on the gas inlet pipeline between the third three-way valve 19 and the gas inlet 202; the top end of the push rod 6 is provided with a driving device 27 for driving the push rod 6 to move vertically.

[0068] As a preferred scheme of the embodiment, the bottom of the lower shell 3 is provided with a liquid discharge port 28 communicated with the collecting cavity 302, and the liquid discharge port 28 is provided with a liquid discharge valve 30; the end cover 1 is provided with a gas feeding hole 101 and a gas discharge hole 102, and the two ends of the gas feeding hole 101 are respectively communicated with the mounting cavity 201 and the combustion cavity 301, and the two ends of the gas discharge hole 102 are also respectively connected with the mounting cavity 201 and the combustion cavity 301.

[0069] As a preferred scheme of the embodiment, the system further comprises a rack 29, which comprises a base 291, vertical columns 292 arranged on both sides of the base 291, and a turnover plate 293 arranged at the top end of the vertical columns 292, and the turnover plate 293 is provided with a mounting hole in the middle, and the upper shell 2 is arranged in the mounting hole; the base 291 is further provided with a lifting device 294, and the upper end of the lifting device 294 is connected with the lower shell 3; the lower end of the lifting device 294 is connected with a sliding block 295 arranged on the base 291 in a sliding manner.

[0070] The lifting device 294 can realize the displacement of the combustion chamber shell in the vertical direction; the sliding block 295 can realize the movement of the combustion chamber shell in the horizontal direction; and the turnover plate 293 can realize the angle turnover of the components such as the ignition device mechanism 5, the clamping mechanism 4, the end cover 2 and the push rod 6 in the system within the range of 0-120°. The system is convenient for disassembly and installation of the propellant rod.

[0071] When the system is assembled, 5L of liquid nitrogen is added in the collecting cavity as the collecting liquid; the end cover 1 is removed, the positions of the lifting device 294 and the sliding block 295 are adjusted, the propellant rod 401 is adhered to the fixed plate 403, and the propellant rod 401 is fixed by the sleeve 404, and the top surface of the fixed plate 403 is connected with the push rod 6; after the propellant rod 401 is firmly adhered, the sleeve 404 is removed, the end cover 1 is covered, and then the connection between the combustion chamber shell and other components in the system is completed.

[0072] Embodiment 2

[0073] The embodiment discloses a complete collection method of solid propellant combustion residues, which is realized by the complete collection system of solid propellant combustion residues disclosed in the embodiment 1, and comprises the following steps.

[0074] Step 1, adding a collecting liquid in the collecting cavity; adhering the propellant rod 401 to the bottom surface of the fixed plate 403, and removing the sleeve 404 after the propellant rod 401 is firmly adhered; completing the connection of the system;

[0075] Step 2, manually set the pressure value of the back pressure valve 15 to 0.1-20 MPa, close the pre-electromagnetic valve 23, the exhaust electromagnetic valve 11 and the gas washing electromagnetic valve 25, open the inlet electromagnetic valve 21, make the high pressure gas 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, ignite the propellant stick 401; during the combustion of the propellant stick 401, the driving device 27 drives the push rod 6 to move downward, and then drives the propellant stick 401 to move downward; during the combustion of the propellant stick, the distance between the lower end surface of the propellant stick and the liquid surface of the collecting liquid is kept constant;

[0077] With the combustion of the propellant stick 401, the push rod 6 moves downward under the driving of the driving device 27, the movement speed of the push rod 6 is equal to the combustion speed of the propellant stick 401, and the working time is equal to the combustion time of the propellant stick 401, the downward movement of the push rod 6 compensates for the increase of the distance between the propellant stick 401 and the liquid surface caused by the combustion of the burning surface, that is, the position of the burning surface is kept unchanged. The agglomerated particles generated after combustion are rapidly cooled and frozen by the collecting liquid.

[0078] Step 4, after the combustion of the propellant stick 401 is completed, open the exhaust electromagnetic valve 11 until the pressure in the combustion chamber shell is equal to the atmospheric pressure; open the pre-electromagnetic valve 23 and the gas washing electromagnetic valve 25, close the exhaust electromagnetic valve 11, and open the vacuum pump 18, so that the fine particulate matters dispersed in the gas in the combustion chamber shell are gathered on the filter membrane of the outlet filter 9;

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

[0080] Step 6, collect the residues in the collecting liquid and the fine particulate matters on the filter membrane of the outlet filter 9, and complete the collection of the solid propellant combustion residues.

[0081] As a preferred scheme of the embodiment, the downward movement speed of the push rod 6 is equal to the combustion speed of the propellant stick 401, and the downward movement speed of the push rod 6 is less than 50 mm / s. By controlling the downward movement speed of the push rod 6 to be equal to the combustion speed of the propellant stick 401, it can be ensured that the distance between the lower end surface of the propellant stick 401 and the liquid surface of the collecting liquid is kept constant during the combustion process, and the distance in the embodiment is 10 mm.

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

[0083] (1)Gas charging stage before combustion: open high-pressure cylinder 20 and inlet electromagnetic valve 21, close pre-electromagnetic valve 23, exhaust electromagnetic valve 11 and gas washing electromagnetic valve 25, at this time, the gas flows from high-pressure cylinder 20, in turn, through inlet filter 26, combustion chamber gas inlet 202, installation cavity 201, combustion cavity 301, gas outlet 203, outlet filter 9, back pressure valve 15 and silencer 13 into tail gas treatment device 14;

[0084] (2)Gas expansion stage during combustion: open buffer electromagnetic valve 24, close inlet electromagnetic valve 21, pre-electromagnetic valve 23, exhaust electromagnetic valve 11 and gas washing electromagnetic valve 25, at this time, the expansion gas generated by combustion is discharged through gas outlet 203, after flowing through outlet filter 9, part of the gas flows through buffer electromagnetic valve 24 to buffer cylinder 7, and the other part of the gas flows through back pressure valve 15 and silencer 13 into tail gas treatment device 14;

[0085] (3)Pressure relief stage after combustion: open exhaust electromagnetic valve 11 and buffer electromagnetic valve 24, close inlet electromagnetic valve 21, pre-electromagnetic valve 23 and gas washing electromagnetic valve 25, at this time, part of the gas is discharged through gas outlet 203, in turn, through outlet filter 9, exhaust electromagnetic valve 11 and silencer 13 into tail gas treatment device 14; the other part of the gas flows from buffer cylinder 7, in turn, through buffer electromagnetic valve 24, exhaust electromagnetic valve 11 and silencer 13 into tail gas treatment device 14;

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

[0087] In summary, the method of the present application can realize the constant pressure in the combustion chamber shell through the opening and closing of each valve; effectively reduces the pressure fluctuation in the combustion chamber shell caused by the combustion of the propellant stick, and ensures that the distance between the propellant stick and the liquid surface of the collection liquid remains constant by controlling the speed of the push rod moving downward to be equal to the burning speed of the propellant stick, that is, ensures that the burning surface position remains unchanged, and further ensures the reliability of the experiment.

[0088] Each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction, as long as it does not deviate from the idea of the present application, and should be regarded as disclosed by the present application.

Claims

1. A solid propellant combustion residue complete collection system, comprising a combustion chamber housing with an observation window, wherein the combustion chamber housing is divided into an upper housing (2) and a lower housing (3) by an end cover (1) arranged in the combustion chamber housing, characterized in that: The upper shell (2) is provided with a mounting chamber (201), the lower shell (3) is provided with a combustion chamber (301) and a collection chamber (302), and 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 provided in the combustion chamber (301), and a propellant strip (401) is provided in the clamping mechanism (4); the ignition mechanism (5) comprises an ignition column assembly (501) passing through the end cover (1), and a heating wire (502) provided at the bottom end of the ignition column assembly (501), the heating wire (502) being in contact with the bottom surface of the propellant strip (401), and the heating wire (502) being capable of generating heat to ignite the propellant strip (401); A push rod (6) capable of moving vertically is provided 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, 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 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 pipe is provided with a first tee (8), the first tee (8) being connected to a first pipeline and a second pipeline, the first pipeline being further provided with an outlet pressure gauge (10) and an exhaust solenoid valve (11); the second pipeline being provided with an emergency exhaust valve (12); the first pipeline and the second pipeline being connected to a muffler (13) and an exhaust gas treatment device (14) after merging; The first pipeline is connected to a first bypass, which 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 inlet 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); 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).

8. The solid propellant combustion residue complete collection system according to claim 1, characterized in that: The utility model further 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), wherein 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), wherein 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 the solid propellant combustion residue complete collection system according to any one of claims 1 to 8, comprising the following steps: Step 1: Add the collection liquid into the collection chamber (302); stick the propellant strip (401) to the bottom surface of the fixing plate (403); remove the sleeve (404) after the propellant strip (401) is firmly bonded, and then complete the system connection; Step 2: close the inlet solenoid valve (21), the front solenoid valve (23), the exhaust solenoid valve (11) and the gas washing solenoid valve (25), adjust the back pressure valve (15) to the set pressure value, open the inlet solenoid valve (21) to feed high-pressure gas into the combustion chamber shell, and make the pressure in the combustion chamber shell reach the set back pressure valve pressure value; 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 distance between the lower end surface of the propellant strip (401) and the surface of the collected 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 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 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: Open 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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