An apparatus and method for measuring solid-liquid two-phase flow kinetic information

Abstract

The present application relates to a kind of device and method for measuring solid-liquid two-phase flow dynamics information, including measuring plate, glass plate, pore pressure sensor, filter screen, triaxial force sensor, force plate, outer pressure strip, inner pressure strip, sealing film, sensor bracket, dynamics information includes the pressure of liquid component in two-phase flow and the force of overall to force plate;The present application can ensure fluid seal when the mechanical sensor is reasonably measured dynamics information;Meanwhile, the present application can also realize the simultaneous measurement of solid-liquid two-phase flow kinematics and dynamics information by mechanical sensor cooperation high-speed camera technology.

Description

Technical Field

[0001] This invention relates to an apparatus and method for measuring the dynamic information of solid-liquid two-phase flow, belonging to the field of fluid measurement technology. Background Technology

[0002] Solid-liquid two-phase flow is widely observed in nature and engineering, including large-scale natural disasters such as debris flows and landslides, natural flow processes such as riverbed evolution and dune movement, and fluidized beds and hydrocyclones commonly used in industrial processes. The flow medium in these processes is mostly a mixture of particle and liquid phases. Properly measuring the flow characteristics of solid-liquid two-phase flows, such as the kinematic information of the two phases, the pressure of the liquid phase, and the forces exerted by the flow medium on the wall, is of great significance for in-depth research into the flow laws of such flows, and ultimately for disaster prevention and protection, and for improving the efficiency of industrial processes.

[0003] Traditional fluid experiments can measure liquid pressure by installing pressure sensors, but it is necessary to avoid the influence of particles on the liquid pressure measurement. For dry particle flows without liquid, force sensors can be used to measure the force information of particles on the wall. However, when measuring the force on the wall in solid-liquid two-phase flows, it is necessary to avoid particle blockage or liquid leakage, which would cause distortion of the force measurement. Traditional flow field observation can obtain kinematic information by shining a laser through a glass wall into the flow field and combining it with high-speed photography and image processing. However, in solid-liquid two-phase flows, it is a major challenge to obtain both kinematic and dynamic information of the flow in a specific area of ​​the experiment.

[0004] Therefore, it is necessary to design a device that integrates multiple sensors to reasonably measure the dynamic information of solid-liquid two-phase flow, and allows optical paths to pass through so as to combine with external devices for kinematic measurements. Summary of the Invention

[0005] The present invention addresses the following technical problem: In response to the above-mentioned defects or improvement needs of the prior art, it provides an apparatus and method for measuring the dynamic information of solid-liquid two-phase flow, which can reasonably measure the force of solid-liquid two-phase flow on the wall and the pressure of liquid components, while not affecting the laser optical path to facilitate motion observation.

[0006] In a first aspect, the present invention provides a device for measuring the dynamic information of a solid-liquid two-phase flow, comprising: a measuring plate 1, a glass plate 2, a pore pressure sensor 3, a filter screen 4, a triaxial force sensor 5, a force plate 6, an outer pressure strip 7, an inner pressure strip 8, a sealing film 9, and a sensor bracket 10. The dynamic information includes the pressure of the liquid component in the two-phase flow and the force exerted by the entire flowing medium on the force plate 6, wherein:

[0007] The measuring plate 1 has two through holes 11 on both sides, and a pore pressure sensor 3 for measuring the pressure of the liquid component in the two-phase flow is placed in each of the two through holes. Each through hole 11 has a filter screen groove 12 with a size larger than the through hole 11, and a filter screen 4 is placed in each filter screen groove 12. The filter screen 4 can block the solid component in the two-phase flow, so that the pore pressure sensor 3 can accurately measure the pressure of the liquid component.

[0008] The triaxial force sensor 5 is fixed to the force plate 6 and is used to measure the force acting on the force plate 6; the triaxial force sensor 5 is fixed on the sensor bracket 10 below, and the sensor bracket 10 is installed below the measuring plate 1.

[0009] A gap is left between the measuring plate 1 and the force plate 6; at the same time, the gap between the measuring plate 1 and the force plate 6 needs to be sealed to prevent fluid leakage; the inner pressure strip 8 presses the sealing film 9 on the force plate 6, and the outer pressure strip 7 presses the sealing film 9 on the measuring plate 1, that is, the sealing film 9 is pressed tightly by the inner pressure strip 8 and the outer pressure strip 7, and the sealing film 9 plays a sealing role.

[0010] Furthermore, the device is also used to measure the kinematic information of solid-liquid two-phase flow. A laser emitting device can be set below the glass plate 2 to irradiate the medium under test through the glass plate 2, and the kinematic information of solid-liquid two-phase flow can be measured in conjunction with a high-speed camera.

[0011] Furthermore, when the sealing film 9 is pressed by the inner pressure strip 8 and the outer pressure strip 7, the sealing film 9 between the inner pressure strip 8 and the outer pressure strip 7 has a margin of safety, rather than being stretched, to ensure that the force plate 6 can move freely within a certain range, avoid generating initial stress on the triaxial force sensor 5, and ensure that the triaxial force sensor 5 can normally measure the force of the force plate 7.

[0012] Furthermore, the triaxial force sensor 5 is fixed to the force plate 6 by welding or bolting, and is fixed to the sensor bracket 10 below by welding or bolting. The sensor bracket 10 is a metal plate with an overall U-shaped shape. The sensor bracket 10 is fixed to the bottom of the measuring plate 1 by bolts, ensuring that the triaxial force sensor 5 can accurately measure the force of the force plate 6.

[0013] Furthermore, the upper surfaces of the force-bearing plate 6 and the measuring plate 1 are flush, so the device does not affect the two-phase flow during measurement.

[0014] Furthermore, the sealing film 9 has the same shape as the outer pressure strip 7 and the inner pressure strip 8.

[0015] Secondly, the present invention provides a method for measuring the dynamic information of a solid-liquid two-phase flow, which is implemented as follows:

[0016] 1) Fix the pore pressure sensor 3 to the wall of the solid-liquid two-phase flow device (taking the measuring plate 1 as an example) through the through hole 11, and install the filter screen 4 in the filter screen groove 12 to isolate the flowing solid components and ensure that the wall height does not change, thereby realizing the measurement of the liquid component pressure in the solid-liquid two-phase flow.

[0017] 2) The triaxial force sensor 5 is fixed to the wall of the solid-liquid two-phase flow device, taking the measuring plate 1 as an example, by means of the sensor bracket 10. There is a certain gap between the force plate 6 and the measuring plate 1, so as to ensure that the force plate 6 can move freely within a certain range, so that the triaxial force sensor 5 fixed to it can reasonably measure the three-dimensional force information of the flowing medium on the wall, taking the force plate 6 as an example. At the same time, in order to avoid the leakage of liquid components in the gap, the gap needs to be sealed by the outer pressure strip 7, the inner pressure strip 8 and the sealing film 9, and the sealing film 9 is guaranteed to have a margin to avoid the initial stress interfering with the accurate measurement of the triaxial force sensor 5.

[0018] 3) A transparent glass plate 2 is also integrated to allow the laser beam path to pass through, and combined with an external high-speed photography device to observe the kinematic information (such as velocity) of the measurement area, thereby realizing the simultaneous measurement of flow kinematic information and dynamic information.

[0019] The advantages of this invention compared to the prior art are as follows:

[0020] 1) This invention can integrate sensors to directly measure the dynamic information of solid-liquid two-phase flow, including the three-dimensional force of the flowing medium on the wall and the pressure of the liquid components. Its advantages lie in the use of ingenious sealing methods to prevent liquid leakage, allowing traditional force-bearing elements to directly measure the force of the solid-liquid two-phase flow on the wall; and the use of a filter to isolate the solid components, enabling traditional water pressure sensors to directly measure the pressure of the liquid components in the solid-liquid two-phase flow.

[0021] 2) In this invention, the mechanical sensor combined with high-speed camera technology can realize the simultaneous measurement of fluid kinematics and dynamics information.

[0022] 3) The sealing film structure described in this invention can achieve the sealing of fluid at the pressure plate.

[0023] 4) The sealing film leaves a margin between the inner and outer pressure strips, so it will not affect the measurement of the triaxial force sensor.

[0024] 5) The surface of the measuring plate can be used as the wall of the solid-liquid two-phase flow domain, and can be used in conjunction with various experimental flow channels, with a wide range of applications. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the device for measuring the dynamic information of solid-liquid two-phase flow according to the present invention.

[0026] Figure 2 This is a schematic diagram of the measuring plate structure;

[0027] Figure 3 This is a schematic diagram of the measuring plate and the load-bearing plate structure;

[0028] Figure 4 This is a schematic diagram of a sensor bracket;

[0029] Figure 5 This is a schematic diagram of the sensor bracket-triaxial force sensor-force plate structure;

[0030] Figure 6 This is a schematic diagram illustrating how the sealing film works. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0032] like Figure 1 As shown, the present invention provides a device for measuring the dynamic information of solid-liquid two-phase flow, including a measuring plate 1, a glass plate 2, a pore pressure sensor 3, a filter screen 4, a triaxial force sensor 5, a force plate 6, an outer pressure strip 7, an inner pressure strip 8, a sealing film 9, and a sensor bracket 10.

[0033] like Figure 2 As shown, the measuring plate 1 has two through holes 11 on both sides. Each through hole 11 has a filter groove 12 with a size larger than the through hole. Each filter groove 12 contains a filter 4, which can block the solid components in the two-phase flow, so that the pore pressure sensor 3 can accurately measure the pressure of the liquid components. The measuring plate 1 has two rectangular holes. A force plate 6 is placed in the rectangular hole 13. The force plate 6 is slightly smaller than the rectangular hole 13. A larger rectangular groove 15 is superimposed on the other rectangular hole 14, in which the glass plate 2 is placed. A bracket for a laser emitting device can be set below the glass plate 2 to irradiate the medium under test through the glass plate 2, and to measure the kinematic information of the medium under test in conjunction with a high-speed camera. The pore pressure sensor 3 is installed in the two through holes 11 of the measuring plate 1.

[0034] like Figure 3As shown, the size of the force plate 6 is smaller than the rectangular hole 13 on the measuring plate 1, so that the force plate 6 does not contact the measuring plate 1, and the magnitude of the force in three directions of the medium to be measured can be accurately measured.

[0035] like Figure 4 As shown, the sensor bracket 10 is a metal plate with an overall U-shaped shape, which is installed under the measuring plate 1 by means of bolts or other means;

[0036] like Figure 5 As shown, the triaxial force sensor 5 is fixed to the force plate 6 by welding or bolting, and is fixed to the sensor bracket 10 below by welding or bolting.

[0037] like Figure 6 As shown, the sealing film 9, the outer pressure strip 7, and the inner pressure strip 8 are all rectangular rings. The sealing film 9 is pressed tightly against the lower surface of the measuring plate 1 and the force plate 6 by the inner pressure strip 8 and the outer pressure strip 7, which can ensure the sealing of the medium to be measured between the measuring plate 1 and the force plate 6. The sealing film 9 has a margin between the outer pressure strip 7 and the inner pressure strip 8, rather than being stretched, which ensures that the force plate 6 can move freely within a certain range and will not affect the measurement of the triaxial force sensor 5.

[0038] The working process of this invention is as follows: When any solid-liquid two-phase flow passes through this measuring device, the flowing medium exerts a force on the force-bearing plate 6, which is measured by the triaxial force sensor 5 fixed to it; the flowing liquid components flow into the through-hole 11 through the filter screens 4 on both sides and act on the pressure-bearing area of ​​the pore pressure sensor, thereby measuring the pressure of the liquid components. At the same time, a laser can be introduced at the middle glass plate 2, which facilitates flow observation in combination with specific observation methods.

[0039] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An apparatus for measuring solid-liquid two-phase flow kinetic information, characterized in that, The device comprises a measuring plate (1), a glass plate (2), a pore pressure sensor (3), a filter screen (4), a triaxial force sensor (5), a force-receiving plate (6), an outer pressure strip (7), an inner pressure strip (8), a sealing film (9), a sensor bracket (10), a through hole (11), and a filter screen groove (12). The two sides of the measuring plate (1) are provided with two through holes (11), and a pore pressure sensor (3) is arranged in each through hole (11) to measure the pressure of the liquid component in the two-phase flow; each through hole (11) is provided with a filter screen groove (12) with a size slightly larger than the through hole (11), and the filter screen (4) is arranged in each filter screen groove (12); the filter screen (4) can block the solid component in the two-phase flow, so that the pore pressure sensor (3) can accurately measure the pressure of the liquid component; The triaxial force sensor (5) is fixed with the force-receiving plate (6) and is used for measuring the force acting on the force-receiving plate (6); the triaxial force sensor (5) is fixed below the sensor bracket (10) by welding or bolt, and the sensor bracket (10) is installed below the measuring plate (1). A gap is left between the measuring plate (1) and the force-receiving plate (6); meanwhile, the gap between the measuring plate (1) and the force-receiving plate (6) needs to be sealed to avoid fluid leakage; the inner pressure strip (8) presses the sealing film (9) on the force-receiving plate (6), and the outer pressure strip (7) presses the sealing film (9) on the measuring plate (1), that is, the sealing film (9) is pressed tightly by the inner pressure strip (8) and the outer pressure strip (7), and the sealing film (9) plays a sealing role; The device is also used for measuring the kinematic information of the solid-liquid two-phase flow, a laser emitting device is arranged below the glass plate (2), laser is emitted through the glass plate (2) to the medium to be measured, and a high-speed camera is used to measure the kinematic information of the solid-liquid two-phase flow. When the sealing film (9) is pressed tightly by the inner pressure strip (8) and the outer pressure strip (7), the sealing film (9) between the inner pressure strip (8) and the outer pressure strip (7) has a surplus amount, so that the force-receiving plate (6) can move freely within a certain range, initial stress is avoided on the triaxial force sensor (5), and the triaxial force sensor (5) can normally measure the force acting on the force-receiving plate (6).

2. The device for measuring solid-liquid two-phase flow kinetic information of claim 1, wherein: The triaxial force sensor (5) is fixed with the force-receiving plate (6) by welding or bolt, and is fixed below the sensor bracket (10) by welding or bolt; the sensor bracket (10) is a metal plate with a U-shaped overall shape, and is fixed below the measuring plate (1) by bolt, so that the triaxial force sensor (5) can accurately measure the force acting on the force-receiving plate (6).

3. The device for measuring solid-liquid two-phase flow kinetic information of claim 1, wherein: The upper surfaces of the force-receiving plate (6) and the measuring plate (1) are flush, and the device does not affect the flow of the two-phase flow during measurement.

4. The device for measuring solid-liquid two-phase flow kinetic information of claim 1, wherein: The sealing film (9) has the same shape as the outer pressure strip (7) and the inner pressure strip (8).

5. The device for measuring solid-liquid two-phase flow kinetic information of claim 1, wherein: The following is achieved:

6. A method for measuring solid-liquid two-phase flow kinetic information, characterized by, ​ 1) The measuring plate (1) is used as the wall of the solid-liquid two-phase flow device. The hole pressure sensor (3) is fixed on the measuring plate (1) through the through hole (11). The filter screen (4) is installed in the filter screen groove (12) to isolate the flowing solid components and ensure that the wall height does not change, thereby realizing the measurement of the pressure of the liquid component in the solid-liquid two-phase flow. 2) The measuring plate (1) is used as the wall of the solid-liquid two-phase flow device. The triaxial force sensor (5) is fixed on the measuring plate (1) through the sensor bracket (10). The force plate (6) and the measuring plate (1) have a gap, thereby ensuring that the force plate (6) can move freely within a certain range, so that the triaxial force sensor (5) fixed to it can reasonably measure the three-dimensional force information of the wall, such as the force plate (6). At the same time, in order to avoid the leakage of the liquid component in the gap, the gap needs to be sealed by the outer pressure strip (7), the inner pressure strip (8) and the sealing film (9), and the sealing film (9) is left with a surplus to avoid the initial stress interference with the accurate measurement of the triaxial force sensor (5). 3) The transparent glass plate (2) is also integrated to allow the laser light path to pass through, combined with the external observation device to measure the kinematics of the flow, thereby realizing the simultaneous measurement of the kinematics and dynamics of the solid-liquid two-phase flow.

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