Fine sand directional throwing equipment based on jet airflow in high-pressure and high-temperature environment

Abstract

The invention provides fine sand directional throwing equipment based on jet airflow in a high-pressure and high-temperature environment. The fine sand directional throwing equipment comprises a combustion chamber shell, a measuring section wind tunnel shell, a sand throwing section wind tunnel shell, a measuring end downstream sleeve, a measuring end upstream sleeve, a jet airflow pipe, a flame tube, a combustion chamber flange plate and the like. The tail end of the jet airflow pipe is connected with the air inlet end of the measurement section sleeve, and then sand is thrown from the head end of the jet airflow pipe and jet airflow is introduced, so that sand grains can be jetted into the measurement section sleeve, and the sand grains are prevented from being accumulated at the bottom in a wind tunnel; the measuring section sleeve adopts a two-section type design, gas distribution is achieved, sand grains are effectively prevented from entering a flame tube cooling gas path, flame tube cooling holes are prevented from being blocked, the service life of a combustion chamber is guaranteed, and deformation and fracture caused by uneven heating of the flame tube are avoided.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of wind tunnel gas path separation, and relates to a fine sand isolation device for a wind tunnel, in particular to a fine sand directional feeding device based on jet airflow under a high-pressure and high-temperature environment. BACKGROUND

[0002] In daily life, for example, watering flowers, a watering can is usually used, and the watering can is used to push liquid in the can out at high speed by high-pressure airflow; in scientific research, for example, particle adhesion test of a normal-temperature wind tunnel, in the test, high-pressure airflow after heating is used to spray molten paraffin at high speed, and then the molten paraffin is uniformly atomized by an atomizing nozzle and mixed with the main airflow.

[0003] However, in the particle adhesion test of a high-temperature wind tunnel, the situation is different. If the scheme of feeding sand downstream of the combustion chamber is adopted, it is usually difficult to achieve and relatively dangerous due to the influence of high-temperature and high-pressure airflow at the outlet of the combustion chamber; if the scheme of feeding sand upstream of the combustion chamber is adopted, sand and dust particles are mixed with the airflow of the wind tunnel and then enter the combustion chamber, which may cause some particles to enter the cold bypass of the combustion chamber, thereby blocking the cooling holes of the flame tube of the combustion chamber, reducing the service life of the combustion chamber, and even causing the flame tube to deform and break due to uneven heating. SUMMARY

[0004] In view of the defects and deficiencies of the prior art, the purpose of the present application is to provide a fine sand directional feeding device based on jet airflow under a high-pressure and high-temperature environment, which solves the technical problem that feeding sand upstream of the combustion chamber may cause sand and dust to block the cooling holes of the combustion chamber in the prior art.

[0005] In order to solve the above technical problems, the present application adopts the following technical solutions: A fine sand directional feeding device based on jet airflow under a high-pressure and high-temperature environment, comprising a combustion chamber shell, a measurement section wind tunnel shell and a sand feeding section wind tunnel shell connected in sequence from back to front; a measurement end downstream sleeve and a measurement end upstream sleeve are arranged in the measurement section wind tunnel shell in sequence from back to front, and a space is left between the axial rear end of the measurement end downstream sleeve and the axial front end of the measurement end upstream sleeve.

[0006] A jet airflow pipe is arranged in the sand feeding section wind tunnel shell, the axial rear end of the jet airflow pipe extends into the axial front end of the measurement end upstream sleeve, the axial front end of the jet airflow pipe is integrally provided with an airflow pipe air inlet pipe, the airflow pipe air inlet pipe extends along the radial direction and the radial outer end thereof is fixed on the inner wall of the sand feeding section wind tunnel shell.

[0007] The combustion chamber shell is coaxially provided with a flame tube; the combustion chamber flange plate is arranged between the flame tube and the measuring end downstream sleeve; the measuring end downstream sleeve is fixedly connected with the combustion chamber flange plate through bolts; a plurality of swirler installation openings and a plurality of air holes are formed on the combustion chamber flange plate; the air holes are located on the radial outer side of the swirler installation openings; the swirler installation openings and the air holes are located in the inner cavity of the flame tube; and the swirler installation openings are installed with swirler.

[0008] A plurality of flame tube cooling gas inlets are formed on the combustion chamber flange plate; the flame tube cooling gas inlets are located on the radial outer side of the air holes; and the flame tube cooling gas inlets are located in the annular cavity between the outer wall of the flame tube and the inner wall of the combustion chamber shell.

[0009] The present application also has the following technical features: Specifically, the main oil pipeline reservation opening and the auxiliary oil pipeline reservation opening are respectively connected with the oil tank outside.

[0010] Specifically, the isolation pipe is fixedly installed on the jet airflow pipe; the isolation pipe is located downstream of the airflow pipe air inlet pipe; the radial outer end of the isolation pipe is in contact with the inner wall of the sand injection section wind tunnel shell; the sand injection section wind tunnel shell is provided with an isolation pipe clamping seat; and the bottom of the isolation pipe clamping seat is connected with the isolation pipe.

[0011] Specifically, the outer wall of the measuring end upstream sleeve is fixedly provided with a plurality of sleeve installation seats; the sleeve installation seats extend outward along the radial direction and extend out of the measuring section wind tunnel shell.

[0012] Specifically, the combustion chamber shell, the measuring section wind tunnel shell and the sand injection section wind tunnel shell are connected through flanges and bolts.

[0013] Specifically, the axial rear end of the measuring end upstream sleeve is provided with an extension plate; and the axial rear end of the extension plate extends into the measuring end downstream sleeve.

[0014] Specifically, the airflow pipe clamping seat is installed on the sand injection section wind tunnel shell; and the bottom of the airflow pipe clamping seat is fixedly connected with the airflow pipe air inlet pipe.

[0015] Compared with the prior art, the present application has the following beneficial technical effects: (I) The tail end of the jet airflow pipe is connected with the gas inlet end of the measuring section sleeve, then sand is poured from the head end of the jet airflow pipe and the jet airflow is introduced, so that the sand particles can be sprayed into the measuring section sleeve, preventing the sand particles from accumulating at the bottom of the wind tunnel. The measuring section sleeve is designed in two sections, and a space is left between the two end sleeves. After the main flow gas flows through the annular space between the outer wall of the measuring end upstream sleeve and the wind tunnel shell, it is then divided at the gap between the two end sleeves and flows into the inner cavity of the flame tube and the flame tube cooling gas path. Through the above design, the present application effectively prevents part of the sand particles from entering the flame tube cooling gas path, thereby avoiding the blockage of the flame tube cooling hole, ensuring the service life of the combustion chamber, and further avoiding the deformation and fracture of the flame tube due to uneven heating.

[0016] (II) The present application designs an isolation pipe at the sand pouring port, which can effectively prevent fine sand from being blown into the main flow gas in advance, thereby minimizing the pollution of the sand particles to the flame tube cooling gas path. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 is a structural schematic view of the jet airflow pipe and the measuring end sleeve.

[0018] Fig. 2 is a structural schematic view of the jet airflow pipe, the measuring end sleeve and the wind tunnel shell.

[0019] Fig. 3 is a structural schematic view of the jet airflow pipe.

[0020] Fig. 4 is a structural schematic view of the measuring section sleeve.

[0021] The meanings of the reference numbers in the figure are as follows: 1-jet airflow pipe, 2-measuring end upstream sleeve, 3-measuring end downstream sleeve, 4-sand pouring section wind tunnel shell, 5-measuring section wind tunnel shell, 6-combustion chamber flange, 7-flange, 8-airflow pipe clamp seat, 9-isolation pipe, 10-sleeve mounting seat, 11-main oil pipe reserved port, 12-flame tube cooling gas inlet, 13-flame tube, 14-cyclone installer port, 15-vent hole, 16-secondary oil pipe reserved port, 17-combustion chamber shell, 18-elongated plate, 19-airflow pipe gas inlet pipe, 20-isolation pipe clamp seat.

[0022] The technical solutions of the present application are further described below in conjunction with embodiments. DETAILED DESCRIPTION

[0023] In the present application, "high pressure and high temperature environment" refers to an environment with a temperature above 1200℃ and a pressure above 0.4MPa.

[0024] It should be noted that the components used in the present application are conventional components known in the prior art, unless otherwise specified.

[0025] Following the above technical solutions, 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 modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0026] Example 1: This embodiment provides a fine sand directional delivery device based on jet airflow under high pressure and high temperature conditions, such as... Figs. 1 to 4 As shown, the structure includes a combustion chamber shell 17, a measuring section wind tunnel shell 5, and a sand-feeding section wind tunnel shell 4, connected sequentially from back to front. Inside the measuring section wind tunnel shell 5, a downstream measuring sleeve 3 and an upstream measuring sleeve 2 are arranged sequentially from back to front, with a space between the axial rear end of the downstream measuring sleeve 3 and the axial front end of the upstream measuring sleeve 2. A jet airflow pipe 1 is installed inside the sand-feeding section wind tunnel shell 4. The axial rear end of the jet airflow pipe 1 extends into the axial front end of the upstream measuring sleeve 2. An airflow pipe inlet pipe 19 is integrally provided at the axial front end of the jet airflow pipe 1, extending radially and having its radial outer end fixed to the inner wall of the sand-feeding section wind tunnel shell 4. A flame tube 13 is coaxially arranged inside the combustion chamber shell 17. A combustion chamber flange 6 is provided between the flame tube 13 and the downstream sleeve 3 of the measuring end. The downstream sleeve 3 of the measuring end is fixedly connected to the combustion chamber flange 6 by bolts. The combustion chamber flange 6 has multiple cyclone mounting ports 14 and multiple vent holes 15. The vent holes 15 are located radially outside the cyclone mounting ports 14. Both the cyclone mounting ports 14 and the vent holes 15 are located in the inner cavity of the flame tube 13. A cyclone is installed in the cyclone mounting port 14. The combustion chamber flange 6 has multiple flame tube cooling gas inlets 12. The flame tube cooling gas inlets 12 are located radially outside the vent holes 15. The flame tube cooling gas inlets 12 are located in the annular cavity between the outer wall of the flame tube 13 and the inner wall of the combustion chamber shell 17.

[0027] As a specific solution in this embodiment, the outer shell 5 of the wind tunnel in the measurement section is provided with a main oil pipeline reserved port 11 and a secondary oil pipeline reserved port 16; the main oil pipeline reserved port 11 and the secondary oil pipeline reserved port 16 are respectively connected to the external oil tank, and the cylindrical gap between the downstream sleeve 3 of the measurement end and the upstream sleeve 2 of the measurement end is reserved for the oil pipeline.

[0028] As a specific scheme of the embodiment, the isolation pipe 9 is fixedly installed on the jet air pipe 1, the isolation pipe 9 is located downstream of the air pipe inlet pipe 19, the radial outer end of the isolation pipe 9 is in contact with the inner wall of the sand-throwing section wind tunnel shell 4, the isolation pipe holder 20 is installed on the sand-throwing section wind tunnel shell 4, and the bottom of the isolation pipe holder 20 is connected with the isolation pipe 9; in the embodiment, in order that the sand particles are not blown into the main flow channel from the position of the sand-throwing port, the isolation pipe 9 is installed at the sand-throwing port, the isolation pipe holder 20 is inserted into the wind tunnel from the upper side of the sand-throwing port, and the jet air pipe 1 is connected with the isolation pipe 9 through interference fit.

[0029] As a specific scheme of the embodiment, a plurality of sleeve mounting seats 10 are fixedly arranged on the outer wall of the measurement end upstream sleeve 2, the sleeve mounting seats 10 extend outward along the radial direction and protrude out of the measurement section wind tunnel shell 5; in the embodiment, the sleeve mounting seats 10 protruding out of the measurement section wind tunnel shell 5 are provided with external threads, the measurement section upstream sleeve 2 is fixed with the measurement section wind tunnel shell 5 from the outside by using a nut, and thus the influence of the measurement end sleeve on the flow distribution of the combustion chamber can be reduced.

[0030] As a specific scheme of the embodiment, the combustion chamber shell 17, the measurement section wind tunnel shell 5 and the sand-throwing section wind tunnel shell 4 are connected through the flange 7 and the bolt.

[0031] As a specific scheme of the embodiment, the axial rear end of the measurement end upstream sleeve 2 is provided with the extension plate 18, and the axial rear end of the extension plate 18 extends into the measurement end downstream sleeve 3; in the embodiment, the tail of the measurement section upstream sleeve 2 is provided with the extension plate 18 connected with the measurement end downstream sleeve 3, and thus the sand particles can be prevented from falling into the cooling channel.

[0032] As a specific scheme of the embodiment, the air pipe holder 8 is installed on the sand-throwing section wind tunnel shell 4, and the bottom of the air pipe holder 8 is fixedly connected with the air pipe inlet pipe 19; in the embodiment, the inner wall of the air pipe inlet pipe 19 is provided with internal threads, the air pipe holder 8 is fixed with the sand-throwing section wind tunnel shell 4 through the external threads on the outer wall of the bottom end of the air pipe holder 8, and the gaskets are arranged above and below the air pipe holder 8 for sealing. The lumen of the jet air pipe 1 is connected with the outside through the center hole of the air pipe holder 8 and the air pipe inlet pipe 19.

[0033] The working process of the present application is as follows: Main flow gas is blown into the wind tunnel from the right arrow, part of the flow first flows into the annular channel between the outer wall of the upstream sleeve 2 and the outer shell 5 of the measuring section, then flows into the downstream sleeve 3 from the gap between the upstream sleeve 2 and the downstream sleeve 3, and then enters the inner cavity of the flame tube 13 through the swirler on the combustion chamber flange 6 and the air hole 15; another part of the flow enters the annular channel between the outer wall of the flame tube 13 and the inner wall of the combustion chamber shell 17 through the flame tube cooling gas inlet 12 to cool the inner cavity of the flame tube 13. At the same time, the injection gas flow enters the injection gas flow tube 1 from the gas flow tube clamp seat 8, and then mixes with the sand particles at the isolation tube 9, pushing the sand particles out of the injection gas flow tube 1 at high speed. After the sand particles are ejected from the injection gas flow tube 1, they are uniformly mixed with the main flow gas in the inner cavity of the sleeve in the measuring section wind tunnel shell 5, and finally enter the combustion chamber through the swirler and air hole 15.

Claims

1. A high-pressure high-temperature environment based on the injection of air flow fine sand directional delivery equipment, comprising a combustion chamber shell (17), a measuring section wind tunnel shell (5) and a sand delivery section wind tunnel shell (4) connected in turn; characterized in that: the measuring section wind tunnel shell (5) is provided with a measuring end downstream sleeve (3) and a measuring end upstream sleeve (2), and a space is left between the measuring end downstream sleeve (3) and the measuring end upstream sleeve (2); the sand delivery section wind tunnel shell (4) is provided with an injection air flow pipe (1), the axial rear end of the injection air flow pipe (1) extends into the measuring end upstream sleeve (2), and the axial front end of the injection air flow pipe (1) is integrally provided with an air flow pipe air inlet pipe (19); the combustion chamber shell (17) is coaxially provided with a flame tube (13), the flame tube (13) and the measuring end downstream sleeve (3) are provided with a combustion chamber flange (6), the measuring end downstream sleeve (3) is fixedly connected with the combustion chamber flange (6), a plurality of swirler mounting holes (14) and a plurality of air holes (15) are formed in the combustion chamber flange (6), and the swirler mounting holes (14) and the air holes (15) are located in the inner cavity of the flame tube (13); a plurality of flame tube cooling gas inlets (12) are formed in the combustion chamber flange (6), the flame tube cooling gas inlets (12) are located on the radial outer side of the air holes (15), and the flame tube cooling gas inlets (12) are located in the annular cavity between the outer wall of the flame tube (13) and the inner wall of the combustion chamber shell (17). The main oil pipe preformed hole (11) and the auxiliary oil pipe preformed hole (16) are formed in the measuring section wind tunnel shell (5). The isolation pipe (9) is fixedly installed on the injection air flow pipe (1), the isolation pipe (9) is located downstream of the air flow pipe air inlet pipe (19), the radial outer end of the isolation pipe (9) is in contact with the inner wall of the sand delivery section wind tunnel shell (4), the isolation pipe clamping seat (20) is installed on the sand delivery section wind tunnel shell (4), and the bottom of the isolation pipe clamping seat (20) is connected with the isolation pipe (9). The outer wall of the measuring end upstream sleeve (2) is fixedly provided with a plurality of sleeve mounting seats (10), the sleeve mounting seats (10) extend outward along the radial direction and out of the measuring section wind tunnel shell (5). The combustion chamber shell (17), the measuring section wind tunnel shell (5) and the sand delivery section wind tunnel shell (4) are connected through the flange (7) and the bolt.

2. The high pressure high temperature environment based jet stream based fine sand directional placement apparatus as claimed in claim 1, wherein, The axial rear end of the measuring end upstream sleeve (2) is provided with an extension plate (18), and the axial rear end of the extension plate (18) extends into the measuring end downstream sleeve (3).

3. The high pressure high temperature environment based jet stream based fine sand directional placement apparatus as claimed in claim 1, wherein, The air flow pipe clamping seat (8) is installed on the sand delivery section wind tunnel shell (4), and the bottom of the air flow pipe clamping seat (8) is fixedly connected with the air flow pipe air inlet pipe (19).

4. The high pressure high temperature environment based jet stream based fine sand directional placement apparatus as claimed in claim 1, wherein, ​ 5. The high pressure high temperature environment based jet stream based fine sand directional placement apparatus as claimed in claim 1, wherein, ​ 6. The high pressure high temperature environment based jet stream based fine sand directional placement apparatus as claimed in claim 1, wherein, ​ 7. The high pressure high temperature environment based jet stream based fine sand directional placement apparatus as claimed in claim 1, wherein, ​

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