Multi-modal profiling flow field data acquisition device and data acquisition method

Abstract

The invention discloses a multi-modal profiling flow field data acquisition device and a data acquisition method, a liquid flow maintaining box is fixed above a workbench of the data acquisition device, a profiling liquid flow table and a jet flow table which are coaxially and reversely connected are arranged in the liquid flow maintaining box, the profiling liquid flow table is located below the jet flow table, and a spiral blade is fixedly arranged on the upper surface of the profiling liquid flow table; at least one stage of flow channel is arranged in the jet flow table, each stage of flow channel extends to the circumferential direction of the jet flow table to form a jet flow opening, a hollow sliding rod is arranged in a center hole of the jet flow table, the upper end of the sliding rod is connected with a liquid supply device through a pipeline, the middle is dynamically sealed with the upper surface of the jet flow table, and the lower end is in threaded connection with the jet flow table. At least one group of liquid outlets are formed in the lower part of the sliding rod, a test plate is fixedly mounted in the liquid flow maintaining box, two groups of pressure sensors are arranged at the joints of the test plate and the left and right ends of the liquid flow maintaining box, and nine or eight distance measuring sensors are uniformly arranged on the test plate. The device can realize a multi-level and multi-mode jet scene.

Description

Technical Field

[0001] This invention belongs to the fields of precision manufacturing and fluid dynamics testing technology, and particularly relates to a multimodal conformal flow field data acquisition device and data acquisition method. Background Technology

[0002] Gear pumps are one of the application scenarios for high-speed jet flow fields. Due to the low viscosity of the working medium, the extreme and complex operating conditions, and the requirement for high reliability, it is necessary to design a high-speed jet test device to simulate this complex flow field. In the field of fuel system applications, high-precision simulation is required, at least in terms of flow field distribution and scientifically reasonable acquisition of simulation data. Currently, most jet test devices for data acquisition have fixed jet flow field nozzles, which cannot achieve multi-stage integrated injection and generally do not provide contour turbulence simulation, thus failing to meet the data acquisition requirements during equipment testing. Therefore, reliable improvements can be made to their structural design and jet method. Summary of the Invention

[0003] To provide a multi-level integrated jet-induced turbulent flow field simulation, this invention provides a multi-modal flow field data acquisition device and method.

[0004] The objective of this invention is achieved in the following manner: A multimodal contoured flow field data acquisition device includes a worktable, a liquid flow holding box fixedly disposed above the worktable, a discharge pipe disposed in the liquid flow holding box, a throttle valve disposed on the discharge pipe, a contoured liquid flow turntable and a jet turntable disposed inside the liquid flow holding box, the contoured liquid flow turntable being located below the jet turntable, the contoured liquid flow turntable and the jet turntable being connected by a coaxial reversing mechanism, the output shaft of the coaxial reversing mechanism passing through the liquid flow holding box and the worktable and connected to a drive motor, the drive motor being fixedly mounted below the worktable, a helical blade fixedly disposed on the upper surface of the contoured liquid flow turntable, and at least one flow channel disposed inside the jet turntable, each flow channel being respectively A jet nozzle is formed extending to the circumference of the jet turntable. Each group of jet nozzles has at least four nozzles evenly distributed around the circumference of the jet turntable. A hollow slide rod is installed in the central hole of the jet turntable. The upper end of the slide rod is connected to the liquid supply device through a pipe. The middle part of the slide rod is dynamically sealed to the upper surface of the jet turntable. The lower end of the slide rod extends into the interior of the jet turntable and is threadedly connected to the jet turntable. At least one set of liquid outlets is provided at the lower part of the slide rod. The number of sets of liquid outlets is adapted to the number of stages of the flow channel. A test plate is fixedly installed in the liquid flow holding box. Two sets of pressure sensors are installed at the connection between the test plate and the left and right ends of the liquid flow holding box. Each set has at least three sensors. Nine or eight distance sensors are evenly arranged on the test plate.

[0005] The ranging sensor is a lidar sensor, with one transmitter and one receiver fixedly mounted on the test plate and the other fixedly mounted on the inner wall of the liquid flow holding tank opposite the test plate.

[0006] Each group has at least two liquid outlets evenly distributed around the circumference of the slide bar.

[0007] A liquid storage space is provided between the liquid outlet and the flow channel inlet.

[0008] The liquid discharge pipe of the liquid holding tank is connected to the liquid supply device through a return pipe.

[0009] A pressure regulating valve is installed on the pipe connecting the upper end of the slide rod to the liquid supply device.

[0010] The multimodal contour flow field data acquisition method implemented using the above-mentioned device includes the following steps: Step a: Zero the pressure sensor and complete the initial value calibration of the distance sensor to bring both readings to zero; Step b: Control the drive motor under the worktable to rotate at a given speed, and drive the contouring fluid turntable and the fluid turntable to rotate in opposite directions on the same axis; Step c: Adjust the position of the slide bar so that the liquid outlet at the bottom of the slide bar is connected to the flow channel inlet on the jet turntable to control the jet mode; Step d: Open the liquid supply device and input the required pressure of liquid flow into the slide bar. At this time, the initial pressure value of the two sets of pressure sensors is F. Synchronously adjust the throttle valve on the liquid flow holding tank discharge pipe to maintain the liquid level height in the liquid flow holding tank. Step e: During the process of high-speed jet scouring the test plate, two sets of pressure sensors perform real-time measurements to obtain real-time pressure values ​​F2 and F3, and calculate the pressure difference ∆F2=F2-F and ∆F3=F3-F; the distance sensor performs real-time measurements to obtain the real-time distance difference Ψ2 (9), and calculates the real-time flatness value ∆Ψ of the test piece according to the triangle algorithm to characterize the surface wear of the test piece.

[0011] By controlling the number of conduction stages in the flow channel, adjusting the connection area between the liquid outlet and the flow channel inlet, adjusting the pressure of the liquid entering the slide bar, and adjusting the number, tilt angle, and rotation direction of the spiral blades, a multi-level, multi-gradient, and multi-modal high-speed jet flow field can be obtained.

[0012] The two sets of pressure difference values ​​and flatness values ​​are fed back to the system software to draw the stress curves on different sides of the tested plate and the real-time scouring wear failure diagram.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting up a contoured liquid flow stage, the actual working conditions can be effectively simulated. By changing the number of spiral blades, tilt angle, and direction of rotation on the contoured liquid flow stage, or by replacing the contoured liquid flow stage, a multi-modal high-speed jet flow field can be obtained.

[0014] 2. The jet turntable is designed with multiple flow channels inside. Different slide rods have different numbers of liquid outlets. By changing different slide rods, the number of flow channel stages can be adjusted, which can realize multi-level jet conversion and match various scenarios.

[0015] 3. Control the connection area between the liquid outlet at the bottom of the slide bar and the inlet of the jet turntable, and adjust the pressure to realize more modes of jet realization scenarios.

[0016] 4. By setting up pressure sensors and distance sensors for composite sensing, and matching them with a real-time data acquisition system, the accuracy, real-time performance, and effective data mining capabilities of the measurement process are enhanced.

[0017] 5. The device of the present invention has a simple structure and strong stability, and can be applied to jet experiments with working media including but not limited to fuel. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the contour fluid transfer stage.

[0020] Figure 3 This is a schematic diagram of the connection structure between the jet turntable and the slide bar.

[0021] In the figure, 1-worktable; 2-fluid flow holding box; 3-contour fluid flow turntable; 31-spiral blade; 4-jet turntable; 41-flow channel; 42-jet port; 5-slide rod; 51-liquid outlet; 52-first sealing plate; 53-second sealing plate; 54-sealing ring; 55-compression spring; 6-test plate; 7-pressure sensor; 8-distance sensor; 9-liquid storage space. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. After reading the contents of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by this invention.

[0023] like Figures 1-3As shown, a multimodal contoured flow field data acquisition device includes a workbench 1, a liquid flow holding box 2 fixedly mounted above the workbench 1, a liquid flow holding box 2 equipped with a discharge pipe, and a throttle valve mounted on the discharge pipe. A contoured liquid flow turntable 3 and a jet turntable 4 are mounted inside the liquid flow holding box 2. The contoured liquid flow turntable 3 is located below the jet turntable 4. The contoured liquid flow turntable 3 and the jet turntable 4 are connected by a coaxial reversing mechanism. The output shaft of the coaxial reversing mechanism passes through the liquid flow holding box 2 and the workbench 1 and is connected to a drive motor. The drive motor is fixedly mounted below the workbench 1. A spiral blade 31 is fixedly mounted on the upper surface of the contoured liquid flow turntable 3. At least one flow channel 41 is provided inside the jet turntable 4. Each flow channel 41 extends to the circumference of the jet turntable 4 to form a jet nozzle 42. At least four jet nozzles 42 are evenly distributed in each group along the circumference of the jet turntable 4. A central hole of the jet turntable 4 is provided with... A hollow slide rod 5 has its upper end connected to a liquid supply device via a pipe. The middle part of the slide rod 5 is dynamically sealed to the upper surface of the jet turntable 4. The lower end of the slide rod 5 extends into the interior of the jet turntable 4 and is threadedly connected to the jet turntable 4. At least one set of liquid outlets 51 is provided at the lower part of the slide rod 5. The number of sets of liquid outlets 51 is adapted to the number of stages of the flow channel 41. A test plate 6 is fixedly installed inside the liquid flow holding box 2. A set of pressure sensors 7 is provided at the left and right connection points between the test plate 6 and the liquid flow holding box 2. Specifically, slots are provided on the left and right side walls of the liquid flow holding box 2. The two ends of the test plate 6 are locked in the slots. A set of pressure sensors 7 is provided between the test plate 6 and the liquid flow holding box 2 in the left and right slots. Nine or eight ranging sensors 8 are evenly distributed on the test plate 6. The nine ranging sensors 8 are arranged in a square array. If eight ranging sensors 8 are arranged, the center of the square array is omitted.

[0024] The internal flow channels of the jet turntable 4 can be designed with one, two, three, or more stages. Flow channels with more than one stage can be fully open, or not fully open, with only one or two stages open, etc. For example... Figure 1 As shown, the jet turntable 4 has a three-stage flow channel 41 inside. Depending on the needs, the three-stage flow channel can be partially or fully opened. To test partial opening, different slide rods 5 are selected or replaced. Different slide rods 5 have different numbers of liquid outlets 51. A slide rod 5 can have one, two, or three sets of liquid outlets 51. When designing two sets of liquid outlets 51, there are several possibilities, each corresponding to any two stages of the three-stage flow channel.

[0025] The correspondence between the number of outlets 51 and the number of stages in the flow channel 41 means that the number of stages in the flow channel 41 corresponds one-to-one with the number of outlets 51 on the slide bar, or the number of outlets 51 on the slide bar is less than the number of stages in the flow channel 41 designed on the jet turntable 4, that is, the number of flow channel conduction stages is less than the designed number of stages. Different slide bars 5 have different numbers of outlets. By changing different slide bars 5, the number of conduction stages in the flow channel 41 can be adjusted, enabling multi-stage jet conversion to match various scenarios.

[0026] The ranging sensor 8 is a lidar sensor, with one transmitter and one receiver fixedly mounted on the test plate 6 and the other fixedly mounted on the inner wall of the liquid flow holding tank 2 opposite the test plate 6. It can accurately determine the flatness value of the test plate 6 as needed, and by recording data in real time and making predictive models, it provides data support for practical applications.

[0027] The contour-following liquid flow turntable 3 adopts a contour-following design, which can simulate the flow field generated by the working medium driven by the high-speed movement of gears in the gearbox. By changing the level and pressure of the jet flow sprayed by the jet turntable, the high-speed flow field of this type can be comprehensively simulated.

[0028] Furthermore, at least two liquid outlets 51 in each group are evenly distributed in the circumferential direction of the slide bar 5, preferably three.

[0029] A liquid storage space 9 is provided between the liquid outlet 51 and the flow channel inlet. The liquid storage space 9 can stabilize the flow when the liquid flow rate is small or the viscosity of the liquid medium is low, or when certain factors change.

[0030] Furthermore, the liquid discharge pipe of the liquid flow holding tank 2 is connected to the liquid supply device through a return pipe, and the liquid flowing out of the liquid discharge pipe of the liquid flow holding tank 2 enters the liquid supply device for recycling.

[0031] A pressure regulating valve is installed on the pipe connecting the upper end of the slide rod 5 to the liquid supply device, and the pressure of the liquid entering the slide rod 5 is adjusted by the pressure regulating valve.

[0032] The dynamic seal between the middle of the slide bar 5 and the upper surface of the jet turntable 4 is achieved through the following specific methods: Figure 3 As shown, a T-shaped mounting groove is set in the center of the jet turntable 4. A first sealing plate 52 and a second sealing plate 53 are installed in the horizontal groove of the T-shaped mounting groove. The sum of the thicknesses of the first sealing plate 52 and the second sealing plate 53 is slightly less than the height of the horizontal groove of the T-shaped mounting groove. The first sealing plate 52 and the slide rod 5 are integral structures. Sealing rings 54 are respectively set on the lower surface of the first sealing plate 52 and the upper surface of the second sealing plate 53. The lower end of the slide rod 5 extends into the vertical groove of the T-shaped mounting groove and is threadedly connected to the jet turntable 4. A compression spring 55 is also set between the first sealing plate and the second sealing plate. The lower limit of the movement of the slide rod 5 in the jet turntable 4 corresponds to the maximum connection area between the liquid outlet 51 and the inlet of the flow channel 41. Adjusting the connection area between the liquid outlet 51 and the inlet of the flow channel 41, that is, reducing the conduction area, requires rotating the slide rod 5 upward. The upward movement distance of the slide rod is generally 0.2-0.5mm. When the slide bar 5 moves upward, the first sealing plate moves together with the slide bar, and the compression spring 55 presses the second sealing plate downward. The gap between the first sealing plate and the second sealing plate is sealed by the sealing ring 54.

[0033] Furthermore, an end cap is installed on the T-shaped mounting groove to fix the first sealing plate inside the T-shaped mounting groove. The end cap and the T-shaped mounting groove are well sealed, and the liquid in the liquid holding tank 2 will not enter the jet turntable 4 through the gap between the end cap and the T-shaped mounting groove.

[0034] The multimodal contour flow field data acquisition method implemented using the above-mentioned device includes the following steps: Step a: Zero the pressure sensor 7, complete the initial value calibration of the distance sensor 8, and bring the readings of both to zero. The distance between the test plate 6 and the inner wall of the liquid flow holding box opposite it is 150mm. Step b: Control the drive motor under the worktable 1 to rotate at a given speed of 5000 r / min, and drive the contouring fluid turntable 3 and fluid turntable 4 to rotate coaxially in opposite directions; Step c: The jet turntable 4 has three-stage flow channels 41, and the lower part of the slide bar 5 is equipped with three sets of liquid outlets 51. Adjust the position of the slide bar 5 so that all three-stage flow channels 41 on the jet turntable 4 are open. Step d: Open the liquid supply device and input a constant pressure of 2 MPa liquid flow into the slide bar 5. At this time, the initial pressure value of the two sets of pressure sensors 2 is F=20. Synchronously adjust the throttle valve on the liquid flow holding tank 2 to keep the liquid level in the liquid flow holding tank 2 flush with the upper surface of the contour liquid flow turntable 3. Step e: Two sets of pressure sensors 7 are set at the connection between the test plate 6 and the liquid flow holding box 2 at the left and right ends, four in each set. Nine distance sensors 8 are arranged in a square array on the test plate 6. During the process of high-speed jet scouring the test plate 6, the pressure sensors 7 perform real-time measurement to obtain real-time pressure values ​​F2 and F3, and calculate the pressure difference F2 (4) = (20.112, 20.131, 20.122, 20.300) and F3 (4) = (20.303, 20.344, 20.233, 20.206). The distance sensors 8 perform real-time measurement to obtain real-time distance difference Ψ2 (9) (4.6.5; 3.0.4; 2.6.1). The real-time flatness value ∆Ψ = 6 of the test piece is calculated according to the triangle algorithm to characterize the surface wear of the test piece.

[0035] Furthermore, the two sets of pressure difference values ​​and flatness values ​​are fed back to the system software to plot the stress curves and real-time scouring wear failure diagrams of different sides of the tested plate 6. By replacing slide bars with different numbers of outlet groups, adjusting the number of conduction stages in the multi-stage flow channel, controlling the connection area between outlet 51 and the inlet of flow channel 41, and adjusting the number, tilt angle, and rotation direction of the spiral blades 31, a multi-stage, multi-modal high-speed jet flow field can be obtained. Furthermore, the pressure difference and flatness values ​​are fed back to the system software to obtain pressure curves and real-time erosion wear failure diagrams under different stages and modes.

[0036] The multimodal conformal flow field data acquisition device and method disclosed in this invention can be used for the acquisition and analysis of experimental data on the failure mechanism of gear pump friction pair structural components.

[0037] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting up a contoured liquid flow stage, the actual working conditions can be effectively simulated. By changing the number of spiral blades, tilt angle, and direction of rotation on the contoured liquid flow stage, or by replacing the contoured liquid flow stage, a multi-modal high-speed jet flow field can be obtained.

[0038] 2. The jet turntable is designed with multiple flow channels inside. Different slide rods have different numbers of liquid outlets. By changing different slide rods, the number of flow channel stages can be adjusted, which can realize multi-level jet conversion and match various scenarios.

[0039] 3. Control the connection area between the liquid outlet at the bottom of the slide bar and the inlet of the jet turntable, and adjust the pressure to realize more modes of jet realization scenarios.

[0040] 4. By setting up pressure sensors and distance sensors for composite sensing, and matching them with a real-time data acquisition system, the accuracy, real-time performance, and effective data mining capabilities of the measurement process are enhanced.

[0041] 5. The device of the present invention has a simple structure and strong stability, and can be applied to jet experiments with working media including but not limited to fuel.

[0042] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present invention, and these should also be considered within the scope of protection of the present invention.

Claims

1. A multimodal contour flow field data acquisition device, characterized in that: The system includes a workbench (1), a liquid flow holding box (2) fixedly installed above the workbench (1), a liquid flow holding box (2) with a discharge pipe and a throttle valve on the discharge pipe, a contoured liquid flow turntable (3) and a jet turntable (4) installed inside the liquid flow holding box (2), the contoured liquid flow turntable (3) being located below the jet turntable (4), the contoured liquid flow turntable (3) and the jet turntable (4) being connected by a coaxial reversing mechanism, the output shaft of the coaxial reversing mechanism passing through the liquid flow holding box (2) and the workbench (1) and connected to a drive motor, the drive motor being fixedly installed below the workbench (1), a spiral blade (31) fixedly installed on the upper surface of the contoured liquid flow turntable (3), and at least one flow channel (41) installed inside the jet turntable (4), each flow channel (41) extending to the circumference of the jet turntable (4) to form a jet port (4). 2) At least four jet ports (42) are evenly distributed around the circumference of the jet turntable (4). A hollow slide rod (5) is installed in the center hole of the jet turntable (4). The upper end of the slide rod (5) is connected to the liquid supply device through a pipe. The middle part of the slide rod (5) is dynamically sealed to the upper surface of the jet turntable (4). The lower end of the slide rod (5) extends into the interior of the jet turntable (4) and is threadedly connected to the jet turntable (4). At least one set of liquid outlets (51) is set at the lower part of the slide rod (5). The number of sets of liquid outlets (51) is adapted to the number of stages of the flow channel (41). The test plate (6) is fixedly installed in the liquid flow holding box (2). Two sets of pressure sensors (7) are set at the connection between the test plate (6) and the left and right ends of the liquid flow holding box (2). There are at least three in each set. Nine or eight distance sensors (8) are evenly arranged on the test plate (6).

2. The multi-modal profiling flow field data acquisition device of claim 1, wherein: The ranging sensor (8) is a lidar sensor, with one transmitter and one receiver fixedly installed on the test plate (6) and the other fixedly installed on the inner wall of the liquid flow holding tank (2) opposite the test plate (6).

3. The multi-modal profiling flow field data acquisition device of claim 1, wherein: At least two liquid outlets (51) in each group are evenly distributed in the circumferential direction of the slide bar (5).

4. The multi-modal profiling flow field data acquisition device of claim 1, wherein: A liquid storage space (9) is provided between the liquid outlet (51) and the flow channel inlet.

5. The multi-modal profiling flow field data acquisition device of claim 1, wherein: The liquid discharge pipe of the liquid holding tank (2) is connected to the liquid supply device through a return pipe.

6. The multi-modal profiling flow field data acquisition device of claim 1, wherein: A pressure regulating valve is installed on the pipe connecting the upper end of the slide bar (5) to the liquid supply device.

7. A multimodal conformal flow field data acquisition method implemented using the apparatus described in any one of claims 1-6, characterized in that: Includes the following steps, Step a: Zero the pressure sensor (7) and complete the initial value calibration of the distance sensor (8) so that the readings of both are zero; Step b: Control the drive motor under the worktable (1) to rotate at a given speed, and drive the contouring fluid turntable (3) and fluid turntable (4) to rotate in opposite directions on the same axis; Step c: Adjust the position of the slide bar (5) so that the liquid outlet (51) at the bottom of the slide bar (5) is connected to the inlet of the flow channel (41) on the jet turntable (4) to control the jet mode; Step d: Open the liquid supply device and input the required pressure of liquid flow into the slide bar (5). At this time, the initial pressure value of the two pressure sensors (2) is F. Synchronously adjust the throttle valve on the liquid flow holding tank (2) discharge pipe to maintain the liquid level in the liquid flow holding tank (2). Step e: During the process of high-speed jet scouring the test plate (6), two sets of pressure sensors (2) perform real-time measurements to obtain real-time pressure values ​​F2 and F3, and calculate the pressure difference ∆F2=F2-F and ∆F3=F3-F; the distance sensor (8) performs real-time measurements to obtain the real-time distance difference Ψ2 (9), and calculates the real-time flatness value ∆Ψ of the test piece according to the triangle algorithm to characterize the surface wear of the test piece.

8. The multimodal conformal flow field data acquisition method according to claim 7, characterized in that: By controlling the number of conduction stages of the flow channel, adjusting the connection area between the liquid outlet (51) and the inlet of the flow channel (41), adjusting the pressure of the liquid entering the slide bar (5), and adjusting the number, tilt angle, and rotation direction of the spiral blades (31), a multi-level, multi-gradient, and multi-modal high-speed jet flow field can be obtained.

9. The multimodal contour flow field data acquisition method according to claim 7 or 8, characterized in that: The two sets of pressure difference values ​​and flatness values ​​are fed back to the system software to draw the stress curves and real-time scouring and wear failure diagrams of different sides of the tested plate (6).

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