Multiphase flow particle jet nozzle structure

Abstract

The invention discloses a multiphase flow particle jet nozzle structure, and belongs to the technical field of multiphase flow jet structures. The device comprises an outer pipe, an inner pipe, a shunting box, an isolating ring, an injection box and an air injection pipe array, the outer pipe and the inner pipe are coaxially connected, the inner pipe is arranged in the shunting box, the outer pipe is arranged outside the shunting box, at least one air injection inlet pipe is arranged on the lower portion of the shunting box, and the shunting box is connected with the injection box through the isolating ring; the injection box is provided with an inner pipe injection hole and a plurality of air injection pipe outlets, the inner pipe injection hole is connected with the inner pipe, the isolation ring is provided with a plurality of air injection pipe inlets and an air injection pipe array, the air injection pipe array comprises a plurality of air injection pipes, and the two ends of each air injection pipe are connected with the corresponding air injection pipe inlet and the corresponding air injection pipe outlet respectively. The problem that the quality of a wind tunnel test flow field is affected due to the accumulation phenomenon of solid particles such as ice crystals and sand dust in the jetting process at present is solved, and particle aggregation caused by advanced mixing in the nozzle is avoided.

Description

Technical Field

[0001] This invention relates to a multiphase flow particle jet nozzle structure, belonging to the technical field of multiphase flow jet structure. Background Technology

[0002] Wind tunnel testing is a crucial ground-based testing facility in the development of aircraft and other transportation vehicles. Environmental testing requires special conditions such as sand and dust tests and ice crystal particle tests. These tests necessitate the ejection of ice crystals and sand particles, thus requiring the use of a jet structure to achieve gas-solid two-phase flow.

[0003] However, uniform particle distribution is an unavoidable problem during multiphase flow jetting. Especially when an external flow field with a contraction function is present, multiphase flow particles will also contract and aggregate under the drag force of air, resulting in uneven particle distribution and seriously affecting the flow field quality and accuracy of test data in wind tunnel tests.

[0004] Currently, most multiphase flow nozzles use liquid water droplets as the main experimental medium, which is suitable for droplet spraying scenarios such as raindrops and atomization, but not for solid multiphase flow particles such as ice crystals and sand.

[0005] Therefore, there is an urgent need to propose a multiphase flow particle jet nozzle structure to solve the above-mentioned technical problems. Summary of the Invention

[0006] The purpose of this invention is to address the problem of accumulation of solid particles such as ice crystals and sand during the spraying process, which affects the flow field quality in wind tunnel tests. A brief overview of the invention is provided below to offer a basic understanding of certain aspects of it. It should be understood that this overview is not an exhaustive summary of the invention. It is not intended to identify key or essential parts of the invention, nor is it intended to limit the scope of the invention.

[0007] The technical solution of the present invention:

[0008] A multiphase flow particle jet nozzle structure includes an outer tube, an inner tube, a flow divider box, an isolation ring, a jet box, and an air jet pipe array. The outer tube and the inner tube are coaxially connected. The inner tube is disposed inside the flow divider box, and the outer tube is disposed outside the flow divider box. At least one air jet inlet pipe is disposed at the lower part of the flow divider box. The flow divider box is connected to the jet box through the isolation ring. The jet box is provided with an inner tube jet hole and multiple air jet pipe outlets. The inner tube jet hole is connected to the inner tube. Multiple air jet pipe inlets are disposed on the isolation ring. The air jet pipe array includes multiple air jet pipes, and the two ends of each air jet pipe are connected to the corresponding air jet pipe inlet and air jet pipe outlet, respectively.

[0009] Preferably, the surface of the diversion box is provided with multiple positioning pins, the surface of the isolation ring is provided with a first positioning hole that matches the positioning pins, and the surface of the spray box is provided with a second positioning hole that matches the positioning pins. The positioning pins cooperate with the first positioning hole and the second positioning hole to achieve positioning connection.

[0010] Preferably, the isolation ring is further provided with an outer tube and an inner tube connection hole, and the outer tube and the inner tube are connected to the diversion box through the outer tube and inner tube connection hole.

[0011] Preferably, the surface of the connecting hole between the outer tube and the inner tube is threaded, and the outer tube and the inner tube are connected to the distribution box by the thread.

[0012] Preferably, the number and / or tilt angle of the air jets in the air jet array are adjustable.

[0013] Preferably, the number and / or size of the air injection inlet pipes are adjustable.

[0014] Preferably, the spray hole of the inner tube of the spray box is connected to the inner tube by a thread.

[0015] Preferably, the surface of the outer tube and / or the inner tube is provided with piezoelectric ceramic.

[0016] Preferably, one end of the outer tube is threaded for connection with the distributor box.

[0017] Preferably, the multiphase flow particles include ice crystal particles or sand and dust particles.

[0018] The present invention has the following beneficial effects:

[0019] 1. This invention, through the cooperation of a flow divider, an isolation ring, and a jet box, forms two independent areas inside the nozzle: an inner tube and an outer tube that transport solid multiphase flow such as ice crystal particles and sand particles, and an air jet array that transports high-pressure jets. This achieves separate transport and independent control of the two media, avoiding particle agglomeration caused by premature mixing inside the nozzle.

[0020] 2. This invention sets up an air jet pipe array around the central particle jet, and the high-pressure airflow forms a jet state at a certain angle through the jet pipe, which has an impact and dispersing effect on the multiphase flow in the central region. This effectively solves the problem of solid particles agglomeration under the contraction of the external flow field, and significantly improves the uniformity of particle distribution and flow field quality.

[0021] 3. In this invention, the number of jet tubes and the tilt angle of the air jet tube array can be adjusted according to actual usage requirements, enabling operators to optimize the jet dispersion effect for different particle types, particle sizes and flow rates, obtain the optimal multiphase flow area distribution, and enhance the nozzle's adaptability to operating conditions.

[0022] 4. The present invention can increase the number and size of air injection inlet pipes according to test conditions, which facilitates the adjustment of the flow rate and pressure of high-pressure air and further optimizes the matching relationship between jet intensity and particle dispersion effect;

[0023] 5. In this invention, piezoelectric ceramics can be installed on the surfaces of the outer and inner pipes. When solid particles accumulate and cause blockage in the pipe, the piezoelectric ceramics are controlled to generate high-frequency vibrations to disperse the accumulated particle clusters, effectively preventing pipe blockage and ensuring the continuity and stability of the spraying process. Attached Figure Description

[0024] Figure 1 This is a three-dimensional diagram of a multiphase flow particle jet nozzle structure;

[0025] Figure 2 This is a diagram showing the assembly and installation of a multiphase flow particle jet nozzle structure;

[0026] Figure 3 This is a schematic diagram of a multiphase flow particle jet nozzle structure;

[0027] Figure 4 This is a 3D view of the distribution box;

[0028] Figure 5 This is a schematic diagram of the distribution box structure;

[0029] Figure 6 It is a 3D diagram of the inner tube;

[0030] Figure 7 It is a 3D view of the outer tube;

[0031] Figure 8 It is a 3D diagram of the isolation ring;

[0032] Figure 9 This is a schematic diagram of the isolation ring structure;

[0033] Figure 10 It is a 3D view of the spray box;

[0034] Figure 11 This is a schematic diagram of the spray box structure;

[0035] Figure 12 This is a schematic diagram of the air jet tube array;

[0036] Figure 13 It is an arrangement diagram of the four air injection pipes and their corresponding speed ratio curves, wherein (a) is a speed ratio curve of the four air injection pipes and (b) is an arrangement diagram of the four air injection pipes.

[0037] Figure 14It is an arrangement diagram of the eight air injection pipes and their corresponding speed ratio curves, wherein (a) is a speed ratio curve of the eight air injection pipes and (b) is an arrangement diagram of the eight air injection pipes.

[0038] Figure 15 It is an arrangement diagram of the 12 air jet pipes and their corresponding speed ratio curves, wherein (a) is the corresponding speed ratio curve of the 12 air jet pipes and (b) is the arrangement diagram of the 12 air jet pipes;

[0039] Figure 16 It is an arrangement diagram of the 16 air jet pipes and their corresponding speed ratio curves, wherein (a) is the corresponding speed ratio curve of the 16 air jet pipes and (b) is the arrangement diagram of the 16 air jet pipes.

[0040] Figure 17 It is an arrangement diagram of the 20 air jet pipes and their corresponding speed ratio curves, wherein (a) is a speed ratio curve of the 20 air jet pipes and (b) is an arrangement diagram of the 20 air jet pipes;

[0041] Figure 18 It is an arrangement diagram of the 24 air jet pipes and their corresponding speed ratio curves, wherein (a) is the corresponding speed ratio curve of the 24 air jet pipes and (b) is the arrangement diagram of the 24 air jet pipes;

[0042] Figure 19 It is an arrangement diagram of the 30 air jet pipes and their corresponding speed ratio curves, wherein (a) is the corresponding speed ratio curve of the 30 air jet pipes and (b) is the arrangement diagram of the 30 air jet pipes.

[0043] Figure 20 It is an arrangement diagram of the 36 air jet pipes and their corresponding speed ratio curves, wherein (a) is the corresponding speed ratio curve of the 36 air jet pipes and (b) is the arrangement diagram of the 36 air jet pipes;

[0044] Figure 21 It is an arrangement diagram of the four air injection pipes and their corresponding speed ratio curves, wherein (a) is a speed ratio curve of the four air injection pipes and (b) is an arrangement diagram of the four air injection pipes.

[0045] Figure 22 It is an arrangement diagram of the eight air injection pipes and their corresponding speed ratio curves, wherein (a) is a speed ratio curve of the eight air injection pipes and (b) is an arrangement diagram of the eight air injection pipes.

[0046] Figure 23It is an arrangement diagram of the 12 air jet pipes and their corresponding speed ratio curves, wherein (a) is the corresponding speed ratio curve of the 12 air jet pipes and (b) is the arrangement diagram of the 12 air jet pipes;

[0047] Figure 24 It is an arrangement diagram of the 16 air jet pipes and their corresponding speed ratio curves, wherein (a) is the corresponding speed ratio curve of the 16 air jet pipes and (b) is the arrangement diagram of the 16 air jet pipes.

[0048] Figure 25 It is an arrangement diagram of the 20 air jet pipes and their corresponding speed ratio curves, wherein (a) is a speed ratio curve of the 20 air jet pipes and (b) is an arrangement diagram of the 20 air jet pipes;

[0049] Figure 26 It is an arrangement diagram of the 24 air jet pipes and their corresponding speed ratio curves, wherein (a) is the corresponding speed ratio curve of the 24 air jet pipes and (b) is the arrangement diagram of the 24 air jet pipes;

[0050] Figure 27 It is an arrangement diagram of the 30 air jet pipes and their corresponding speed ratio curves, wherein (a) is the corresponding speed ratio curve of the 30 air jet pipes and (b) is the arrangement diagram of the 30 air jet pipes.

[0051] Figure 28 It is an arrangement diagram of the 36 air jet pipes and their corresponding speed ratio curves, wherein (a) is the corresponding speed ratio curve of the 36 air jet pipes and (b) is the arrangement diagram of the 36 air jet pipes;

[0052] Figure 29 It is an arrangement diagram of the four air injection pipes and their corresponding speed ratio curves, wherein (a) is a speed ratio curve of the four air injection pipes and (b) is an arrangement diagram of the four air injection pipes.

[0053] Figure 30 It is an arrangement diagram of the eight air injection pipes and their corresponding speed ratio curves, wherein (a) is a speed ratio curve of the eight air injection pipes and (b) is an arrangement diagram of the eight air injection pipes.

[0054] Figure 31 It is an arrangement diagram of the 12 air jet pipes and their corresponding speed ratio curves, wherein (a) is the corresponding speed ratio curve of the 12 air jet pipes and (b) is the arrangement diagram of the 12 air jet pipes;

[0055] Figure 32It is an arrangement diagram of the 16 air injection pipes and their corresponding speed ratio curves, wherein (a) is the corresponding speed ratio curve of the 16 air injection pipes and (b) is the arrangement diagram of the 16 air injection pipes.

[0056] In the diagram, 1-outer tube, 2-inner tube, 3-diverter box, 4-isolation ring, 5-jet box, 6-air jet pipe array, 31-positioning pin, 32-air jet inlet pipe, 33-connection hole, 41-first positioning hole, 42-outer and inner tube connection hole, 43-air jet pipe inlet, 51-second positioning hole, 52-air jet pipe outlet, 53-inner tube jet hole. Detailed Implementation

[0057] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0058] Example 1: As Figure 1-12 As shown, this embodiment provides a multiphase flow particle jet nozzle structure, including an outer tube 1, an inner tube 2, a flow divider box 3, an isolation ring 4, a jet box 5, and an air jet pipe array 6.

[0059] The outer tube 1 and the inner tube 2 are coaxially arranged, with the inner tube 2 located inside the distribution box 3 and the outer tube 1 located outside the distribution box 3. One end of the outer tube 1 is threaded for connection with the distribution box 3. The outer tube 1 and the inner tube 2 are the main channels for transporting solid multiphase flows such as ice crystal particles and sand particles.

[0060] The lower part of the distribution box 3 is provided with at least one air injection inlet pipe 32 for connecting to a high-pressure airflow. The number and size of the air injection inlet pipes 32 can be increased or adjusted according to specific usage conditions to facilitate the regulation of the flow rate and pressure of the high-pressure air. The distribution box 3 is provided with a connection hole 33 for connecting the outer pipe 1 and the inner pipe 2. Specifically, the outer pipe 1 and the inner pipe 2 are fixedly connected to the distribution box 3 through the connection hole 33. The inner surface of the connection hole 33 can be threaded to achieve a tight connection with the outer pipe 1 and the inner pipe 2 through a threaded connection. The position of the connection hole 33 corresponds to the outer pipe and inner pipe connection hole 42 of the isolation ring 4, ensuring that the outer pipe 1 and the inner pipe 2 can pass through the isolation ring 4 and be securely connected to the distribution box 3.

[0061] The distributor box 3 is connected to the injection box 5 via the isolation ring 4. Specifically, as shown... Figure 4 , 5As shown in Figures 8, 9, 10, and 11, the surface of the diversion box 3 is provided with multiple positioning pins 31, the surface of the isolation ring 4 is provided with a first positioning hole 41 that matches the positioning pins 31, and the surface of the spray box 5 is provided with a second positioning hole 51 that matches the positioning pins 31. Through the cooperation of the positioning pins 31 with the first positioning hole 41 and the second positioning hole 51, the precise positioning and fixed connection of the diversion box 3, the isolation ring 4, and the spray box 5 are achieved.

[0062] The isolation ring 4 is also provided with an outer tube and inner tube connection hole 42 and multiple air injection pipe inlets 43. The outer tube and inner tube connection hole 42 is threaded, and the outer tube 1 and inner tube 2 are connected to the distribution box 3 through the outer tube and inner tube connection hole 42, specifically by tightening the threads.

[0063] The injection box 5 is provided with an inner tube injection hole 53 and multiple air injection pipe outlets 52. The inner tube injection hole 53 is connected to the inner tube 2, specifically by a threaded connection. The inner tube injection hole 53 is the final outlet for the multiphase flow of solid particles, where the particles are ejected in the form of a jet.

[0064] The air jet array 6 includes multiple air jets, each connected at both ends to a corresponding air jet inlet 43 and air jet outlet 52, forming a complete airflow channel. For example... Figure 7 As shown, multiple air jets are arranged in an array around the central axis.

[0065] In this embodiment, the isolation ring 4 plays a crucial role in regional separation: it divides the inside of the nozzle into two independent regions—the solid particle multiphase flow region transported by the inner pipe 2 and the outer pipe 1, and the high-pressure airflow region transported by the air jet array 6. After passing through the air jet array 6, the high-pressure airflow forms a jet state at a certain angle at the air jet outlet 52 of the spray box 5, which impacts and disperses the multiphase flow of particles ejected from the central region, effectively preventing particle aggregation under the contraction of the external flow field.

[0066] Example 2: Based on Example 1, this example further explains the adjustable parameters.

[0067] like Figures 13 to 32As shown, the number and tilt angle of the air jet pipes in the air jet pipe array 6 are adjustable. This adjustment method is mainly achieved by disassembling the air jet pipe array 6 and replacing it with nozzles of the required size and number, thus producing multiple jet array pipes of different sizes. Similarly, annular array fixing holes of the corresponding size are also machined above the annular cover plate at the front of the nozzle. When the number of air jet pipes required for the air jet pipe array 6 in the experiment is small, the other inner pipe jet holes (53) are sealed by plugging. When the number of air jet pipes required for the air jet pipe array 6 increases, the air jet pipes are installed and the corresponding plugging is removed, thus realizing the change of the corresponding array jet. Due to the limitation of the nozzle cross-sectional area, the tilt angle also changes when the size of the air jet pipe is changed.

[0068] By changing the number of air jets (e.g., 4, 8, 12, 16, 20, 24, 30, 36, etc.) and the angle between the air jets and the axis (e.g., 3.52°, 5.71°, 7.45°, etc.), the dispersion effect of the peripheral jet on the central particle flow can be optimized, resulting in the optimal multiphase flow region distribution. The velocity ratio distribution under different parameter combinations is shown in the attached figure. The velocity ratio is defined as the ratio of the jet velocity of each small air jet to the velocity of the large nozzle (364.27 m / s). The small air jets are numbered in counterclockwise order. These data can be used as a reference for nozzle design.

[0069] Meanwhile, the number of air injection inlet pipes (32) is multiple, and the number and size of the air injection inlet pipes 32 are also adjustable. This adjustment method is mainly achieved by disassembling the air injection pipe array 6 and replacing it with air injection pipes of the required size and number, that is, processing multiple air injection pipes of different sizes for the air injection pipe array 6. Similarly, annular array fixing holes of the corresponding size are processed above the annular cover plate at the front of the nozzle. When the number of air injection pipes required for the air injection pipe array 6 in the experiment is small, other injection holes are sealed with plugs. When the number of air injection pipes required for the air injection pipe array 6 increases, the air injection pipes are installed again, and the corresponding plugs are removed, thus realizing the change of the corresponding array injection. When it is necessary to increase the high-pressure air flow, the number of air injection inlet pipes 32 or their diameter can be increased accordingly to meet the needs of different test conditions.

[0070] Figure 13 The image shows a 3D graphic of four small array nozzles and the calculated ratio of the airflow velocity in each small nozzle to the airflow velocity in the central nozzle region. In this array case, it can be seen that the velocity ratios of the various array nozzles are not significantly different, ranging from 0.5 to 0.52.

[0071] Figure 14The image shows a three-dimensional graphic of eight small array nozzles and the calculated ratio of the airflow velocity in each small nozzle to the airflow velocity in the central nozzle region. It can be seen that the velocity ratio of the array nozzles is between 0.46 and 0.59.

[0072] Figure 15 The image shows a three-dimensional graphic of 12 small array nozzles and the calculated ratio of the airflow velocity in each small nozzle to the airflow velocity in the central nozzle region. It can be seen that the velocity ratio of the array nozzles is between 0.27 and 0.45.

[0073] Figure 16 The image shows a three-dimensional graphic of 16 small array nozzles and the calculated ratio of the airflow velocity in each small nozzle to the airflow velocity in the central nozzle region. It can be seen that the velocity ratio of the array nozzles is between 0.26 and 0.52.

[0074] Figure 17 The image shows a three-dimensional graphic of 20 small array nozzles and the calculated ratio of the airflow velocity in each small nozzle to the airflow velocity in the central nozzle region. It can be seen that the velocity ratio of the array nozzles is between 0.45 and 0.54.

[0075] Figure 18 The image shows a three-dimensional graphic of 24 small array nozzles and the calculated ratio of the airflow velocity in each small nozzle to the airflow velocity in the central nozzle region. It can be seen that the velocity ratio of the array nozzles is between 0.43 and 0.56.

[0076] Figure 19 The image shows a three-dimensional graphic of 30 small array nozzles and the calculated ratio of the airflow velocity in each small nozzle to the airflow velocity in the central nozzle region. It can be seen that the velocity ratio of the array nozzles is between 0.18 and 0.39.

[0077] Figure 20 The image shows a three-dimensional graphic of 36 small array nozzles and the calculated ratio of the airflow velocity in each small nozzle to the airflow velocity in the central nozzle region. It can be seen that the velocity ratio of the array nozzles is between 0.46 and 0.54.

[0078] Figure 21 The image shows a 3D graphic of four medium-sized array nozzles and the calculated ratio of the airflow velocity in each medium-sized nozzle to the airflow velocity in the central nozzle region. It can be seen that the velocity ratio of the array nozzles is between 0.67 and 0.69.

[0079] Figure 22The image shows a three-dimensional graphic of eight medium-sized array nozzles and the calculated ratio of the airflow velocity in each medium-sized nozzle to the airflow velocity in the central nozzle region. It can be seen that the velocity ratio of the array nozzles is between 0.65 and 0.67.

[0080] Figure 23 The image shows a three-dimensional graphic of 12 medium-sized array nozzles and the calculated ratio of the airflow velocity in each medium-sized nozzle to the airflow velocity in the central nozzle region. It can be seen that the velocity ratio of the array nozzles is between 0.54 and 0.61.

[0081] Figure 24 The image shows a three-dimensional graphic of 16 medium-sized array nozzles and the calculated ratio of the airflow velocity in each medium-sized nozzle to the airflow velocity in the central nozzle region. It can be seen that the velocity ratio of the array nozzles is between 0.47 and 0.58.

[0082] Figure 25 The image shows a three-dimensional graphic of 20 medium-sized array nozzles and the calculated ratio of the airflow velocity in each medium-sized nozzle to the airflow velocity in the central nozzle region. It can be seen that the velocity ratio of the array nozzles is between 0.40 and 0.51.

[0083] Figure 26 The image shows a three-dimensional graphic of 24 medium-sized array nozzles and the calculated ratio of the airflow velocity in each medium-sized nozzle to the airflow velocity in the central nozzle region. It can be seen that the velocity ratio of the array nozzles is between 0.36 and 0.48.

[0084] Figure 27 The image shows a three-dimensional graphic of 30 medium-sized array nozzles and the calculated ratio of the airflow velocity in each medium-sized nozzle to the airflow velocity in the central jet region. It can be seen that the velocity ratio of the array nozzles is between 0.26 and 0.43.

[0085] Figure 28 The image shows a three-dimensional graphic of 36 medium-sized array nozzles and the calculated ratio of the airflow velocity in each medium-sized nozzle to the airflow velocity in the central nozzle region. It can be seen that the velocity ratio of the array nozzles is between 0.20 and 0.36.

[0086] Figure 29 The image shows a three-dimensional graphic of four large array nozzles and the calculated ratio of the airflow velocity in each large nozzle to the airflow velocity in the central nozzle region. It can be seen that the velocity ratio of the array nozzles is between 0.57 and 0.65.

[0087] Figure 30The image shows a three-dimensional graphic of eight large array nozzles and the calculated ratio of the airflow velocity in each large nozzle to the airflow velocity in the central nozzle region. It can be seen that the velocity ratio of the array nozzles is between 0.37 and 0.48.

[0088] Figure 31 The image shows a three-dimensional graphic of 12 large array nozzles and the calculated ratio of the airflow velocity in each large nozzle to the airflow velocity in the central nozzle region. It can be seen that the velocity ratio of the array nozzles is between 0.22 and 0.39.

[0089] Figure 32 The image shows a three-dimensional graphic of 16 large array nozzles and the calculated ratio of the airflow velocity in each large nozzle to the airflow velocity in the central nozzle region. It can be seen that the velocity ratio of the array nozzles is between 0.15 and 0.34.

[0090] The air jet array designed in this embodiment can be modified by increasing the number of air jets and changing their diameter to meet specific application requirements. By changing these two parameters, different effects can be generated on the central nozzle region, thereby achieving the experimental requirements for related multiphase flow. The main design method is based on the outer cross-sectional dimensions of the nozzle. As long as the cross-sectional dimensions are sufficient to accommodate the number of annularly arranged air jets, the number of air jets can be increased. Furthermore, in addition to changing the number of air jets, the diameter and tilt angle of the air jets can also be changed, provided the nozzle cross-sectional dimensions can accommodate them.

[0091] Example 3: Based on Example 1 or 2, this example adds an anti-clogging design.

[0092] like Figure 1-3 As shown, the surfaces of the outer tube 1 and / or the inner tube 2 are equipped with piezoelectric ceramics. When solid particles such as ice crystals and sand particles accumulate and clog the pipes, the piezoelectric ceramics generate high-frequency vibrations to break up the clogged particles and restore the flow. This design effectively ensures the continuity and stability of the nozzle during long-term operation and avoids test interruptions caused by clogging.

[0093] Example 4: Combination Figures 1 to 12 The working principle of this nozzle will be explained in detail.

[0094] Inside the nozzle, two independent zones are formed by the isolation ring 4:

[0095] First, the particle conveying area: solid multiphase flow such as ice crystal particles and sand particles is conveyed through the outer pipe 1 and the inner pipe 2, passes through the internal channel of the diversion box 3, and is finally ejected from the inner pipe injection hole 53 of the injection box 5 to form a central particle jet.

[0096] Second, the high-pressure airflow region: High-pressure air enters from the air jet inlet pipe 32 at the bottom of the split box 3, is split by the air jet pipe inlet 43 of the isolation ring 4 to each air jet pipe array 6, and is ejected from the air jet pipe outlet 52 of the jet box 5 to form an outer high-pressure jet.

[0097] The high-pressure jet from the periphery is ejected at a certain angle, impacting and breaking up the multiphase flow of particles in the central region. This design effectively solves the problem of solid particles easily agglomerating under the contraction of the external flow field, resulting in a more uniform particle distribution and significantly improving the flow field quality of wind tunnel tests.

[0098] Example 5: This example provides parameter configurations under various spraying conditions, which can be used as a reference when designing nozzles.

[0099] like Figures 8 to 20 As shown, the first injection condition is as follows: nozzle radius 59mm, large nozzle radius 38mm, small nozzle radius 1mm, air supply pipe radius 10mm, small nozzle pipe angle with axis 0.130032rad (7.45°), large nozzle inlet pressure 90000Pa, large nozzle velocity 364.27m / s, and small nozzle inlet pressure 90000Pa. Correspondingly, structural diagrams of 4, 8, 12, 16, 20, 24, 30, and 36 small nozzles and their velocity ratio distributions are displayed.

[0100] like Figures 16 to 28 As shown, the second injection condition is as follows: nozzle radius 59mm, large nozzle radius 38mm, small nozzle radius 3mm, supplementary air pipe radius 10mm, and the angle between the small nozzle and the axis is 0.099669rad (5.71°). Other parameters are the same. The velocity ratio distribution of 4 to 36 small injection pipes is shown accordingly.

[0101] like Figures 29 to 32 As shown, the third injection condition has the following parameters: nozzle radius 59mm, large nozzle radius 38mm, small nozzle radius 5mm, supplementary air pipe radius 10mm, and the angle between the small nozzle and the axis is 0.061423rad (3.52°). Other parameters are the same. The velocity ratio distributions of 4, 8, 12, and 16 small nozzles are also shown.

[0102] The parameters and figures above show that by adjusting the number, size, and angle of the air jets, different peripheral jet velocity distributions can be obtained, thereby achieving optimized control over the dispersion effect of the central particle flow.

[0103] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A multiphase flow particle jet nozzle structure, characterized in that: It includes an outer tube (1), an inner tube (2), a distribution box (3), an isolation ring (4), a jet box (5), and an air jet pipe array (6). The outer tube (1) and the inner tube (2) are coaxially connected. The inner tube (2) is located inside the distribution box (3), and the outer tube (1) is located outside the distribution box (3). At least one air jet inlet pipe (32) is provided at the lower part of the distribution box (3). The distribution box (3) is connected to the jet box (5) through the isolation ring (4). The jet box (5) is provided with an inner tube jet hole (53) and multiple air jet pipe outlets (52). The inner tube jet hole (53) is connected to the inner tube (2). Multiple air jet pipe inlets (43) are provided on the isolation ring (4). The air jet pipe array (6) includes multiple air jet pipes. The two ends of each air jet pipe are connected to the corresponding air jet pipe inlet (43) and air jet pipe outlet (52), respectively.

2. The multiphase flow particle jet nozzle structure according to claim 1, characterized in that: The surface of the diversion box (3) is provided with multiple positioning pins (31), the surface of the isolation ring (4) is provided with a first positioning hole (41) that matches the positioning pins (31), and the surface of the spray box (5) is provided with a second positioning hole (51) that matches the positioning pins (31). The positioning pins (31) cooperate with the first positioning hole (41) and the second positioning hole (51) to achieve positioning connection.

3. The multiphase flow particle jet nozzle structure according to claim 1, characterized in that: The isolation ring (4) is also provided with an outer tube and inner tube connection hole (42), and the outer tube (1) and the inner tube (2) are connected to the diversion box (3) through the outer tube and inner tube connection hole (42).

4. The multiphase flow particle jet nozzle structure according to claim 3, characterized in that: The outer tube and inner tube connecting hole (42) is threaded, and the outer tube (1) and inner tube (2) are connected to the diverter box (3) by threads.

5. The multiphase flow particle jet nozzle structure according to claim 1, characterized in that: The number and / or tilt angle of the air jet array (6) can be configured to different numbers / angles.

6. The multiphase flow particle jet nozzle structure according to claim 1, characterized in that: The number of air injection inlet pipes (32) is multiple.

7. The multiphase flow particle jet nozzle structure according to claim 1, characterized in that: The inner tube injection hole (53) of the injection box (5) is connected to the inner tube (2) by a thread.

8. The multiphase flow particle jet nozzle structure according to claim 1, characterized in that: The outer tube (1) and / or the inner tube (2) are provided with piezoelectric ceramics.

9. The multiphase flow particle jet nozzle structure according to claim 1, characterized in that: One end of the outer tube (1) is threaded for connection with the diverter box (3).

10. A multiphase flow particle jet nozzle structure according to any one of claims 1-9, characterized in that: The multiphase flow particles include ice crystal particles or sand and dust particles.

Images