Rotating disc type continuous liquid drop inclined impact test research device and method

Abstract

The invention discloses a rotating disc type continuous liquid drop inclined impact test research device and method. The device comprises a liquid drop generation system, a liquid drop acceleration system, a fixed bracket, a high-speed camera system and a target, the liquid drop generation system comprises a pressure gauge, a water tank, a needle head, a micro-vibrator, a corresponding conduit pipeline, a flow regulator and a sealing plug, can realize continuous and stable generation of liquid drops, and can control the diameter and dripping frequency of the liquid drops according to the pressure of the pressure gauge, the frequency of the micro-vibrator and the opening degree of the flow regulator; the liquid drop acceleration system comprises a rotating platform, a motor, an angle regulator and a control box, can realize liquid drop acceleration and track inclination, and controls initial conditions of liquid drop impact according to an inclination angle and a rotating speed; the high-speed camera shooting system comprises a high-speed camera, a computer, an LED light source and a calibration ruler, and liquid drop collision shooting at different angles and different frame rates is achieved. The invention provides an effective way for researching the complex dynamics problem after continuous and stable liquid drops impact different targets.

Description

Technical Field

[0001] The present invention belongs to the technical field of experimental research on multiphase hydrodynamic characteristics, and particularly relates to a rotary continuous droplet inclined impact experimental research device and method. Background Art

[0002] The phenomenon of droplet impact is ubiquitous in daily life and industrial production. Existing research mainly focuses on the vertical impact of droplets. In fact, droplets often impact the target surface at an inclined angle rather than the ideal vertical impact. The research on inclined impact can better reflect the droplet dynamic behavior in practical applications.

[0003] The experimental research on droplet inclined impact can be traced back to the 1960s. The main methods for generating inclined droplets in related experiments mainly include electric field or magnetic field acceleration, nozzle jet, air flow blowing, etc. However, in experimental applications, these methods have certain limitations in terms of controllability, consistency, and applicable range.

[0004] The electric field or magnetic field acceleration method is only applicable to charged droplets or liquid working media containing magnetic particles, and has high requirements for the charge characteristics or magnetic response ability of droplets. At the same time, the high electric field or magnetic field environment may change the surface tension and morphology of droplets, resulting in uncertainty in experimental results; although the nozzle jet can precisely control the initial velocity and direction of droplets, it is easy to form a liquid column, and it is difficult to keep the droplet diameter stable; the air flow blowing method can flexibly adjust the droplet movement direction, but it is easily affected by environmental disturbances, and the air flow may change the droplet morphology, affecting the impact dynamic behavior.

[0005] Therefore, developing a new method that is simple and convenient, can reduce external interference, achieve continuous and stable droplet generation, and optimize the control of droplet impact parameters is of great significance for in-depth experimental research on the dynamic characteristics of droplet inclined impact. Summary of the Invention

[0006] In order to solve the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a rotary continuous droplet inclined impact experimental research device and method, which is superior to the prior art in terms of controllability, stability, applicability, and data acquisition accuracy in droplet impact experiments.

[0007] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0008] A rotary continuous droplet inclined impact test research device includes a droplet generation system composed of a pressure device 1, a water tank 2, a sealing plug 3, a conduit 4, a flow regulator 5, a micro-vibrator 6, and a needle 7; a droplet acceleration system composed of a rotating platform 8, a motor 9, an angle regulator 10, and a control box 11; a high-speed imaging system composed of a high-speed camera 13, a computer 14, an LED light source 15, and a calibration scale 16; and a fixed bracket 12 and a target 17. In the droplet generation system, the pressure device 1 generates a stable pressure to control the liquid output rate of the water tank 2 and maintain the rate constant. The water tank 2 is connected to the pressure device 1 and the needle 7 through the conduit 4 respectively. A flow regulator 5 and a micro-vibrator 6 are arranged on the conduit 4 connecting the water tank 2 and the needle 7. The fixed bracket 12 is used to fix and adjust the relative positions of the water tank 2, the needle 7, and the target 17 to achieve the best inclined impact angle under various working conditions. In the droplet acceleration system, the control box 11 controls the rotation speed, start, and stop of the motor 9 and the rotating platform 8. The droplets fall on the rotating platform 8 and are accelerated under the action of surface tension, adhesion, centrifugal force, and gravity. The high-speed camera 13 is placed on one side of the target 17 to capture the evolution and motion behavior of droplet impact. The LED light source 15 is placed on the other side of the target 17 to meet the lighting requirements for shooting. A calibration scale 16 is pasted on the target 17, which can be used for calibrating the droplet size in the captured images. The high-speed camera 13 is connected to the computer 14, and the computer 14 is used to process and analyze the captured images.

[0009] The pressure device 1 in the droplet generation system includes a graduated housing 1-1, a piston 1-2, and a fixed support 1-3. The piston 1-2 is connected to a slider 1-4 on the fixed support 1-3. By turning the screw rod 1-5, the slider 1-4 moves up and down in the movable groove 1-6 on the fixed support 1-3, thereby driving the piston 1-2 to move to achieve pressurization of the pressure device, so that a stable initial pressure is generated in the droplet generation system before the test.

[0010] The water tank 2 in the droplet generation system is airtight. There are three holes on the water tank 2. Two holes are located below the water tank 2 and are connected to the pressure device 1 and the needle 7 through the conduit 4 respectively. The heights of the conduits 4 of the two holes extending into the water tank 2 are the same, ensuring a stable outlet pressure at the needle 7 when generating droplets. The other hole is located above the water tank 2. Test liquid is added through this hole, and the water tank 2 is sealed by the sealing plug 3.

[0011] In the droplet generation system, the generation frequency and diameter of the droplets are controlled by the position of the piston 1-2 in the pressure device 1, the frequency of the micro-vibrator 6, and the opening degree of the flow regulator 5, ensuring the repeatability of droplet generation and the reproducibility of the test.

[0012] In the droplet acceleration system, the rotating platform 8 is controlled by the control box 11 to drive the motor 9 to achieve 360° rotation, and the control box 11 is used to adjust the rotation speed and start / stop of the motor 9. The droplets falling on the rotating platform 8 are accelerated under the action of surface tension, adhesion, centrifugal force and gravity; the angle regulator 10 is provided with scales and can rotate left by 0-90° and has a locking function, which is used to adjust the inclination angle of the rotating platform 8 so that the droplets can impact at the angles set for the working conditions.

[0013] In the high-speed imaging system, the high-speed camera 13 is fixed to the camera mount by threaded connection and can adjust its positions in the X, Y, and Z directions; the images captured by the high-speed camera 13 are connected to the computer 14 through a data cable for image processing and analysis.

[0014] The fixed bracket 12 is used to fix the droplet generation system, the droplet acceleration system, the high-speed imaging system and the target 17; the fixed bracket 12 can adjust the positions of the needle 7 in the X, Y, and Z directions; the fixed bracket 12 can adjust the positions of the target 17 in the X, Y, and Z directions; by adjusting the relative positions of the needle 7 and the target 17 and the angle of the rotating platform 8, the best impact angle under various working conditions can be achieved.

[0015] The target 17 is selected as a deep pool, a shallow pool, a liquid film or a wall surface according to the test objectives.

[0016] For the test method corresponding to the test research device, when conducting the research test on the inclined impact of continuous droplets, first fix each test device on the fixed bracket 12 and connect the droplet generation system through the conduit 4; inject deionized water to a certain height through the water inlet of the water tank 2 and seal the water tank 2 with the sealing plug 3, and turn the screw rod 1-5 to pressurize the pressure device 1; turn on the LED light source 15 and the high-speed camera 13 and set the shooting parameters of the high-speed camera 13; adjust the inclination angle of the rotating platform 8 through the angle regulator 10, turn on the motor 9 and set the rotational motion parameters of the rotating platform 8; turn on the micro-vibrator 6 and set the frequency of the micro-vibrator 6 according to the droplet dripping frequency; turn on the flow regulator 5 and adjust the outlet flow rate so that droplets of a set size are formed at the needle 7; the droplets fall on the rotating platform 8 and are accelerated under the action of surface tension, adhesion, centrifugal force and gravity; the droplets are thrown out of the rotating platform 8 and impact the target 17 at the required angles; during this test process, the high-speed imaging system is used to capture the motion parameters of the droplets and the evolution behavior after the droplets impact the target 17; after the test, turn off the high-speed camera 13 and the droplet acceleration system and restore each system to its initial state.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1) The present invention is superior to the prior art in terms of the controllability, stability, applicability, and data acquisition accuracy of the droplet impact test.

[0019] 2) The present invention combines precise pressure control with micro-vibration to ensure a stable droplet generation process and achieve a highly stable and repeatable droplet impact experiment.

[0020] 3) The present invention supports droplet impact on various target surfaces such as a wall surface, a liquid surface, and a liquid film, and can flexibly adjust parameters such as the impact angle, droplet size, and impact interval, making it suitable for a wider range of hydrodynamic and multiphase flow research.

[0021] 4) By accelerating the droplet through a turntable, the initial velocity, impact angle, and position of the droplet can be precisely controlled, effectively avoiding the problem of unstable initial conditions of the droplet in the prior art. Description of the Drawings

[0022] Figure 1 It is a schematic diagram of the overall structure of a turntable-type continuous droplet inclined impact research test device.

[0023] Figure 2 It is a schematic diagram of the pressure device structure.

[0024] Figure 3 It is a schematic diagram of a turntable-type continuous droplet acceleration method, where a is a front view and b is a side view. Detailed Embodiment

[0025] The present invention will be described in detail below with reference to the drawings and embodiments:

[0026] As Figure 1 shown, the present invention is a turntable-type continuous droplet inclined impact test research device, including a pressure device 1, a water tank 2, a sealing plug 3, a conduit 4, a flow regulator 5, a micro-vibrator 6, a needle 7, a rotating platform 8, a motor 9, an angle regulator 10, a control box 11, a fixed bracket 12, a high-speed camera 13, a computer 14, an LED light source 15, a calibration scale 16, and a target 17.

[0027] Among them, the droplet generation system is composed of the pressure device 1, the water tank 2, the sealing plug 3, the conduit 4, the flow regulator 5, the micro-vibrator 6, and the needle 7; the droplet acceleration system is composed of the rotating platform 8, the motor 9, the angle regulator 10, and the control box 11; the high-speed imaging system is composed of the high-speed camera 13, the computer 14, the LED light source 15, and the calibration scale 16.

[0028] In the droplet generation system, the pressure device 1 generates a stable pressure to control the liquid output rate of the water tank 2 and maintain the rate constant.

[0029] As Figure 2As shown in the figure, the pressure device 1 includes a graduated housing 1-1, a piston 1-2 and a fixed support 1-3. The piston 1-2 is connected to a slider 1-4 on the fixed support 1-3. By turning the screw rod 1-5, the slider 1-4 moves up and down in the movable groove 1-6 on the fixed support 1-3, thereby driving the piston (1-2) to move to achieve pressurization of the pressure device, enabling the droplet generation system to generate a stable initial pressure before the test.

[0030] The water tank 2 in the droplet generation system is airtight. There are three holes on the water tank 2. Two holes are located below the water tank 2 and are respectively connected to the pressure device 1 and the needle 7 through the conduit 4. The conduits 4 of the two holes extend into the water tank 2 at the same height, ensuring a stable outlet pressure at the needle 7 when generating droplets; the other hole is located above the water tank 2. Test liquid is added through this hole, and the water tank 2 is sealed by a sealing plug 3 to seal this hole.

[0031] In the droplet generation system, the generation frequency and droplet diameter of the droplets are controlled by the position of the piston 1-2 in the pressure device 1, the frequency of the micro-vibrator 6, and the opening degree of the flow regulator 5, ensuring the repeatability of droplet generation and the reproducibility of the test.

[0032] In the droplet acceleration system, the rotating platform 8 can be rotated 360° by controlling the motor 9 through the control box 11, and the rotation speed and start / stop of the motor 9 can be adjusted through the control box 11. The droplets falling on the rotating platform 8 are accelerated under the action of surface tension, adhesion, centrifugal force, gravity, etc.; the angle regulator 10 is graduated, can be rotated left by 0-90°, and has a locking function, which is used to adjust the inclination angle of the rotating platform 8, enabling the droplets to impact at the angle set for the working condition.

[0033] In the high-speed imaging system, the high-speed camera 13 and the LED light source 15 are placed on both sides of the target 17; a calibration scale 16 is pasted on the surface of the target 17 for calibrating the droplet size in the captured image; the high-speed camera 13 is fixed to the camera mount through a threaded connection and can achieve position adjustment in the X, Y, and Z directions; the image captured by the high-speed camera 13 is connected to the computer 14 through a data cable for image processing and analysis.

[0034] The fixed bracket 12 is used to fix the droplet generation system, the droplet acceleration system, the high-speed imaging system, and the target 17; the fixed bracket 12 can achieve position adjustment of the needle 7 in the X, Y, and Z directions; the fixed bracket 12 can achieve position adjustment of the target 17 in the X, Y, and Z directions.

[0035] As Figure 3 shown in a and b, by adjusting the relative positions of the needle 7 and the target 17 and the angle of the rotating platform 8, the best impact angle under each working condition is achieved.

[0036] The target 17 can be selected as a deep pool, a shallow pool, a liquid film or a wall surface according to the test objective.

[0037] When conducting the research experiment on continuous droplet inclined impact, first fix each test device on the fixed bracket 12, and connect the droplet generation system through the conduit 4; inject deionized water to a certain height through the water inlet of the water tank 2, and seal the water tank 2 with the sealing plug 3, and turn the screw rod 1-5 to pressurize the pressure device 1; turn on the LED light source 15 and the high-speed camera 13, and set the shooting parameters of the high-speed camera 13; adjust the inclination angle of the rotating platform 8 through the angle adjuster 10, and turn on the motor 9 to set the rotational motion parameters of the rotating platform 8; turn on the micro-vibrator 6, and set the frequency of the micro-vibrator 6 according to the droplet dripping frequency; turn on the flow regulator 5 to adjust the outlet flow rate so that a set droplet size is formed at the needle 7; the droplet falls on the rotating platform 8 and is accelerated under the action of surface tension, adhesion, centrifugal force, gravity, etc.; the droplet is thrown out of the rotating platform 8 and impacts the target 17 at the required angle; during this test process, the high-speed imaging system is used to capture the motion parameters of the droplet and the evolution behavior after the droplet impacts the target 17; after the test, turn off the high-speed camera 13 and the droplet acceleration system, and return each system to its initial state.

Claims

1. A rotary continuous droplet inclined impact test research device, characterized in that: The droplet generation system includes a pressure device (1), a water tank (2), a sealing plug (3), a conduit (4), a flow regulator (5), a micro-vibrator (6), and a needle (7); the droplet acceleration system includes a rotating platform (8), a motor (9), an angle regulator (10), and a control box (11); the high-speed imaging system includes a high-speed camera (13), a computer (14), an LED light source (15), and a calibration scale (16), as well as a fixed bracket (12) and a target (17). In the droplet generation system, the pressure device (1) generates a stable pressure to control the liquid output rate of the water tank (2) and maintain a constant rate. The water tank (2) is connected to the pressure device (1) and the needle (7) through the conduit (4). A flow regulator (5) and a micro-vibrator (6) are provided on the conduit (4) connecting the water tank (2) to the needle (7). The fixed bracket (12) is used to fix and adjust the relative positions of the water tank (2), the needle (7), and the target (17) to achieve the best tilt impact angle under various working conditions. In the droplet acceleration system, the control box (11) controls the rotation speed, start, and stop of the motor (9) and the rotating platform (8). The droplets fall on the rotating platform (8) and are accelerated under the action of surface tension, adhesion, centrifugal force, and gravity. The high-speed camera (13) is placed on one side of the target (17) to capture the evolution and motion behavior of the droplet impact. An LED light source (15) is placed on the other side of the target (17) to meet the lighting requirements for shooting. A calibration scale (16) is pasted on the target (17) and can be used for calibrating the droplet size in the captured images. The high-speed camera (13) is connected to the computer (14), and the computer (14) is used to process and analyze the captured images.

2. The rotary continuous droplet inclined impact test research device according to claim 1, wherein: The pressure device (1) in the droplet generation system includes a graduated housing (1-1), a piston (1-2), and a fixed support (1-3). The piston (1-2) is connected to a slider (1-4) on the fixed support (1-3). By turning the screw rod (1-5), the slider (1-4) moves up and down in the movable slot (1-6) of the fixed support (1-3), thereby driving the piston (1-2) to move to pressurize the pressure device, so that a stable initial pressure is generated in the droplet generation system before the test.

3. The rotary continuous droplet inclined impact test research device according to claim 1, characterized in that: The water tank (2) in the droplet generation system is airtight. There are three holes on the water tank (2). Two holes are located below the water tank (2) and are respectively connected to the pressure device (1) and the needle (7) through the conduit (4). The conduits (4) of the two holes extend into the water tank (2) at the same height to ensure a stable outlet pressure at the needle (7) when generating droplets. The other hole is located above the water tank (2). Test liquid is added through this hole, and the water tank (2) is sealed by the sealing plug (3).

4. The rotary continuous droplet inclined impact test research device according to claim 1, characterized in that: In the droplet generation system, the generation frequency and diameter of the droplets are controlled by the position of the piston (1-2) in the pressure device (1), the frequency of the micro-vibrator (6), and the opening degree of the flow regulator (5), and the repeatability of droplet generation and the reproducibility of the test are ensured.

5. The rotary continuous droplet inclined impact test research device according to claim 1, characterized in that: In the droplet acceleration system, the rotating platform (8) controls the motor (9) through the control box (11) to achieve 360° rotation, and adjusts the rotation speed, start and stop of the motor (9) through the control box (11). The droplets falling on the rotating platform (8) are accelerated under the action of surface tension, adhesion, centrifugal force and gravity; the angle adjuster (10) is provided with scales and can rotate left by 0-90° and has a locking function, which is used to adjust the inclination angle of the rotating platform (8) so that the droplets can obtain the angles set in the working conditions for impact.

6. The rotary continuous droplet inclined impact test research device according to claim 1, characterized in that: In the high-speed imaging system, the high-speed camera (13) is fixed to the camera stand by threaded connection and can adjust the positions in the X, Y, and Z directions; the images captured by the high-speed camera (13) are connected to the computer (14) through a data cable for image processing and analysis.

7. The rotary continuous droplet inclined impact test research device according to claim 1, characterized in that: The fixed bracket (12) is used to fix the droplet generation system, droplet acceleration system, high-speed imaging system and target (17); the fixed bracket (12) can adjust the positions of the needle (7) in the X, Y, and Z directions; the fixed bracket (12) can adjust the positions of the target (17) in the X, Y, and Z directions; by adjusting the relative positions of the needle (7) and the target (17) and the angle of the rotating platform (8), the best impact angle under each working condition can be achieved.

8. The rotary continuous droplet inclined impact test research device according to claim 1, characterized in that: The target (17) is selected as a deep pool, a shallow pool, a liquid film or a wall surface according to the test target.

9. The test method corresponding to the test research device according to any one of claims 1 to 8, characterized in that: When conducting the research experiment on the inclined impact of continuous droplets, first fix each test device on the fixed bracket (12), and connect the droplet generation system through the conduit (4); inject deionized water to a certain height through the water inlet of the water tank (2), and use the sealing plug (3) to seal the water tank (2), and turn the screw rod (1-5) to pressurize the pressure device (1); turn on the LED light source (15) and the high-speed camera (13), and set the shooting parameters of the high-speed camera (13); adjust the inclination angle of the rotating platform (8) through the angle adjuster (10), and turn on the motor (9) to set the rotation motion parameters of the rotating platform (8); turn on the micro-vibrator (6) and set the frequency of the micro-vibrator (6) according to the droplet dripping frequency; turn on the flow regulator (5) and adjust the outlet flow rate so that droplets of a set size are formed at the needle (7); the droplets fall on the rotating platform (8) and are accelerated under the action of surface tension, adhesion, centrifugal force and gravity. The droplets are thrown out of the rotating platform (8) and impact the target (17) at the required angles; during this test process, the high-speed imaging system is used to capture the motion parameters of the droplets and the evolution behavior after the droplets impact the target (17); after the test, turn off the high-speed camera (13) and the droplet acceleration system, and return each system to its initial state.

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