CN111521841A - Device and method for measuring speed of particle image of inner wall flow field of crystallizer water gap model - Google Patents
Device and method for measuring speed of particle image of inner wall flow field of crystallizer water gap model Download PDFInfo
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- CN111521841A CN111521841A CN202010442291.5A CN202010442291A CN111521841A CN 111521841 A CN111521841 A CN 111521841A CN 202010442291 A CN202010442291 A CN 202010442291A CN 111521841 A CN111521841 A CN 111521841A
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- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/18—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the time taken to traverse a fixed distance
- G01P5/22—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the time taken to traverse a fixed distance using auto-correlation or cross-correlation detection means
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention belongs to the technical field of crystallizer nozzles in the metallurgical industry, and particularly relates to a device and a method for measuring the speed of a particle image of a flow field on the inner wall of a crystallizer nozzle model. The system comprises a liquid storage container, a speed measuring system, a liquid pump and a control system, wherein the liquid storage container, the liquid pump and the speed measuring system are communicated in a closed manner; the liquid pump and the speed measuring system are respectively arranged at two ends of the liquid storage container; the control system is in communication connection with the liquid storage container, the liquid pump and the speed measuring system; the speed measurement system simulates the roughness of the inner wall of the crystallizer nozzle by arranging refractory materials on the inner wall of the crystallizer nozzle model, so that the speed measurement is carried out on the flow field of the inner wall of the crystallizer nozzle model. The method can obtain the flow field information near the wall surface of the crystallizer nozzle model, and the information can be used for the aspects of motion behavior research of inclusions in the flow field, research and development of the crystallizer nozzle, development of a flow calculation mathematical model and the like.
Description
Technical Field
The invention belongs to the technical field of crystallizer nozzles in the metallurgical industry, and particularly relates to a device and a method for measuring the speed of a particle image of a flow field on the inner wall of a crystallizer nozzle model.
Background
The crystallizer water gap is positioned between the tundish and the crystallizer and plays a role in conveying molten steel in the tundish to the crystallizer. The flow of molten steel in the water port of the crystallizer is a high-temperature process, and the flow field of the molten steel is difficult to directly measure by the prior art means. At present, numerical simulation or physical simulation methods are generally adopted for researching the fluid flow field of the inner wall of the water gap of the crystallizer, but numerical calculation results are influenced by the grid quality, the boundary condition types and the mathematical model types adopted by flow calculation. Therefore, the research of the flow field of the molten steel on the inner wall of the water gap of the crystallizer is always a hotspot and a difficulty. Relevant research shows that water can be used as a medium for simulating the flow of molten steel according to the flow similarity principle.
The particle image velocimetry is a fluid velocimetry, compared with other fluid velocimetry methods, the method does not need to contact the fluid to be measured; a high-frequency laser and a high-speed camera are carried, so that a flow field with high time resolution and spatial resolution can be obtained, and a computer with a built-in cross-correlation algorithm can furthest mine flow field information under the condition of no repeated experiments. However, this measurement method requires a certain light transmittance in the region to be measured. The real crystallizer water gap is not light-tight, and the flow velocity of fluid inside the crystallizer cannot be directly measured by using particle image speed measuring equipment. At present, the physical simulation is used for researching the flow velocity of fluid in a crystallizer nozzle, a crystallizer nozzle model is manufactured by adopting a light-transmitting organic material according to the real geometric dimension of the crystallizer nozzle, but the model has a certain difference with the real surface characteristic of the crystallizer nozzle. Surface features can affect flow field measurements. And the water gap of the crystallizer has certain curvature, and the measurement of a model flow field with the curvature is always the difficulty of fluid speed measurement.
Disclosure of Invention
In order to solve the problems, the invention provides a device and a method for measuring the speed of a particle image of a flow field on the inner wall of a crystallizer water gap model. The method can obtain the flow field information near the wall surface of the crystallizer nozzle model, and the information can be used for the aspects of motion behavior research of inclusions in the flow field, research and development of the crystallizer nozzle, development of a flow calculation mathematical model and the like.
The invention is realized by the following technical scheme:
a device for measuring speed of particle images of inner wall flow field of mold nozzle model of crystallizer, comprising:
the liquid storage container is used for containing liquid simulating a crystallization water gap flow field;
the speed measurement system is used for measuring the speed of the particles in the flow field on the inner wall of the crystallizer nozzle model;
the liquid pump is used for pumping liquid with trace particles into the crystallizer water gap model and controlling the flow rate of the liquid;
the control system is used for controlling the liquid storage container, the liquid pump and the speed measuring system and calculating the speed of the flow field particles;
the liquid storage container, the liquid pump and the speed measuring system are communicated in a closed mode;
the liquid pump and the speed measuring system are respectively arranged at two ends of the liquid storage container;
the control system is in communication connection with the liquid storage container, the liquid pump and the speed measuring system;
the speed measurement system simulates the roughness of the inner wall of the crystallizer nozzle by arranging refractory materials on the inner wall of the crystallizer nozzle model, so that the speed measurement is carried out on the flow field of the inner wall of the crystallizer nozzle model.
Further, the refractory material is an aluminum-carbon refractory material or a zirconium-carbon refractory material.
Further, the speed measuring system comprises: the device comprises a water prism, a refractory material block, a crystallizer water gap model, a cut-off filter, a medium-long working distance microscope, a high-speed camera and a sheet light source; the refractory material block is adhered to the inner wall of the crystallizer water gap model, and weather-resistant glue can be selected for adhering;
the water prism is connected with a crystallizer water port model; the water prism is arranged outside the crystallizer water port model and close to the liquid container;
the cut-off filter is arranged outside the water prism and close to the wall surface of the water prism;
the medium and long working distance microscope is connected with the high-speed camera; the medium-long working distance microscope is located on the outer side of the water prism and is 50-60 cm away from the outer wall of the water prism.
The sheet light source is arranged outside the water prism and is 10-30 cm away from the outer wall of the water prism.
Furthermore, the medium-long working distance microscope is arranged in front of the high-speed camera, the working distance of the medium-long working distance microscope is 45-60 cm, the working distance is larger than that of a traditional microscope, a millimeter-scale flow field near the inner wall surface of the crystallizer water gap model can be researched, and great difficulty exists in measurement of the millimeter-scale flow field.
Further, when the weather-resistant adhesive is used for adhering or sealing, after the weather-resistant adhesive is coated, the weather-resistant adhesive needs to wait for more than 6 hours under a dry condition to ensure that the weather-resistant adhesive is completely solidified.
Further, the water prism is used for shooting the tracer particles in the crystallizer water gap model with the curvature.
Further, the cutoff filter is used for eliminating reflected light on the inner wall of the crystallizer nozzle model, and only the fluorescence of the tracer particles is allowed to pass through the cutoff filter.
Further, the cut-off filter is used for filtering out visible light with the wavelength less than 540 nm.
Furthermore, the crystallizer water gap model and the water prism are both made of light-transmitting organic materials, and the refractive index of the organic materials is close to that of water.
Furthermore, the size of the refractory material block is 10-12 mm in length, 15-20 mm in width and 1-2 mm in thickness.
Further, the liquid pump is a water pump; the liquid storage container is a water tank; the control system is a computer.
Further, the water pump is a self-priming water pump or other water pumps.
Further, the device further comprises a flow meter; the flowmeter is arranged between the liquid pump and the speed measuring system.
Further, the liquid storage container, the flowmeter and the speed measuring system are communicated by adopting a connecting water pipe.
Further, the flowmeter is a rotameter or other type of flowmeter.
The invention also aims to provide a method for measuring the speed of the particle image of the flow field on the inner wall of the crystallizer nozzle model, which adopts the device to simulate the flow field at the crystallizer nozzle and measure the speed of the flow field, so as to obtain the flow field information of the simulated crystallizer nozzle, wherein the flow field information comprises the transient flow field speed, the time-averaged flow field speed, the flow field pulsation speed, the shearing and vortex intensity, the turbulent kinetic energy and the Reynolds stress.
Further, the method specifically comprises the following steps:
s1, water is filled in the liquid storage container, the crystallizer water gap model and the water prism, a graduated scale is placed in the measuring area, the position and the focal length of the medium-long working distance microscope are adjusted until scales on the graduated scale are clear and recognizable, and the size of the measuring area is calibrated by using a control system;
s2, starting a liquid pump, and sowing tracer particles into a liquid storage container; adjusting the thickness of the sheet light source in the measurement area;
s3, after the flow meter reading is stable, the control system sets the time interval of two laser beams and the exposure times of the camera, so that the maximum displacement of the tracer particle motion in the flow field under two exposures is between 5 and 10 pixels;
s4, emitting laser by the sheet light source, and synchronously exposing by the camera; and after exposure, the camera transmits the picture with the particle image into the control system, and the control system is used for analyzing the flow field result to finally obtain the flow field information of the simulated crystallizer water gap.
Further, the measuring area is the position of the refractory block and a few millimeters around the refractory block, and particularly, the few millimeters need to be determined according to actual measurement.
Further, the control system is built-in with a cross-correlation algorithm.
Further, a particle image speed measurement business software Davis8.4.0 software is installed in the control system, and the software is used for carrying out image acquisition control and image post-processing (a cross-correlation algorithm is used for calculating flow field information) on the flow field at the crystallization water gap model.
Further, the control system is a computer.
Furthermore, the diameter of the tracer particle is 1-55 μm, the maximum excitation wavelength is 570nm, and the maximum emission wavelength is 610 nm.
Further, the thickness of the sheet light is 1 +/-0.5 mm.
Further, the laser light emitted from the sheet light source is green light of 532nm wavelength emitted from a Nd: YAG laser.
Further, when the method is used for measuring the speed, the water quantity filled in the water prism is used for covering a measuring area; the water quantity in the liquid storage container is based on the water filling capacity of the crystallizer water gap model.
Further, the film light source emits laser twice, and the camera synchronously exposes twice.
Furthermore, when the position and the focal length of the medium-long working distance microscope are adjusted, the adjustment is needed until fluorescent tracing particles in a measuring area are clear and distinguishable; if the number of the trace particles in the measurement area is too small, the trace particles need to be supplemented into the liquid storage container.
Further, the relationship between the flow rate of the fluid in the crystallization nozzle and the continuous casting billet is as follows: the faster the continuous casting billet is pulled, the larger the fluid flow in the water gap of the crystallizer is, according to the mass conservation theorem, the pulling speed v (m/min), the width a (m) of the section of the casting blank, the thickness b (m) of the section of the casting blank, and the cross-sectional area s (m) in the water gap of the crystallizer2) And the flow rate Q (m) in the water port of the crystallizer3Min) has the following relationship:
the inner wall flow field information of the crystallizer water gap model at different pulling speeds (different flow rates) can be measured according to the formula (1).
Further, the specific content of the flow field result analysis performed by the computer is as follows:
dividing a flow field area acquired by a camera into a plurality of inquiry domain windows; extracting the gray function at the time of flow field t as F (i, j) and the gray function at the time of t +. DELTA.t as G (i, j) at each query domain window (i, j), and substituting into a cross-correlation function:
R(x,y)＝F(i,j)×G(i+x,j+y)＝F(i,j)×F(i+x-△x,j+y-△y)
r (x, y) is a cross-correlation function, the cross-correlation function obtains a peak value at a point (delta x, delta y), the (delta x, delta y) is a two-dimensional vector, namely the particle motion displacement at the inquiry domain window (i, j) under the time interval delta t; (ii) the velocity of the trace particle at (i, j) × (i, j) ═ Δ x/Δ t, vy (i, j) ═ Δ y/Δ t;
vx (i, j) is the x-direction velocity component at (i, j) in the flow field, vy (i, j) is the y-direction velocity component at (i, j) in the flow field, and Δ t is the time interval of the two beams of laser.
The invention has at least the following beneficial technical effects:
the method can obtain the flow field information near the wall surface of the crystallizer nozzle model, and the information can be used for researching the movement behavior of the impurities in the flow field, researching and developing the crystallizer nozzle, developing a flow calculation mathematical model and the like.
Drawings
Fig. 1 is a schematic structural diagram of a device for measuring speed of particle images of a flow field on an inner wall of a water gap of a crystallizer in an embodiment of the present invention.
Fig. 2 is a schematic diagram of an arrangement of a fluid flow rate measurement optical path in an embodiment of the present invention.
FIG. 3 is a schematic diagram of an experimental procedure in an embodiment of the present invention.
Fig. 4 is an example of a measurement result of a crystallizer nozzle inner wall flow field cross-correlation algorithm in the embodiment of the invention.
Fig. 5 is a flow field measurement result in an embodiment of the present invention.
Description of reference numerals: the method comprises the following steps of 1-a water prism, 2-a crystallizer water gap model, 3-a water tank, 4-a connecting water pipe, 5-a valve, 6-a water pump, 7-a flowmeter, 8-a right-angle elbow, 9-a straight-through reducing, 10-a refractory material block, 11-a cut-off filter, 12-a light source, 13-a medium-long working distance microscope and 14-a high-speed camera.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
On the contrary, the invention is intended to cover alternatives, modifications, equivalents and alternatives which may be included within the spirit and scope of the invention as defined by the appended claims. Furthermore, in the following detailed description of the present invention, certain specific details are set forth in order to provide a better understanding of the present invention. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details.
Referring to fig. 1 and fig. 2, in this embodiment, a device for measuring speed of particle images of a flow field on an inner wall of a mold nozzle of a crystallizer is provided, the device comprising:
the liquid storage container is used for containing liquid simulating a crystallization water gap flow field;
the speed measurement system is used for measuring the speed of the particles in the flow field on the inner wall of the crystallizer nozzle model;
the liquid pump is used for pumping liquid with trace particles into the crystallizer water gap model and controlling the flow rate of the liquid;
the control system is used for controlling the liquid storage container, the liquid pump and the speed measuring system and calculating the speed of the flow field particles;
the liquid storage container, the liquid pump and the speed measuring system are communicated in a closed mode;
the liquid pump and the speed measuring system are respectively arranged at two ends of the liquid storage container;
the control system is in communication connection with the liquid storage container, the liquid pump and the speed measuring system;
the speed measurement system simulates the roughness of the inner wall of the crystallizer nozzle by arranging refractory materials on the inner wall of the crystallizer nozzle model, so that the speed measurement is carried out on the flow field of the inner wall of the crystallizer nozzle model.
In this embodiment and other embodiments, the device adopts a right-angle elbow and a straight-through reducing to realize the closed communication of the liquid storage container, the liquid pump and the speed measuring system; valves are used to control the flow of liquid.
In this embodiment, the refractory material is an aluminum-carbon refractory material.
In other embodiments, the refractory material is a zirconium carbon refractory material.
In this embodiment, the speed measuring system includes: the device comprises a water prism 1, a refractory material block 10, a crystallizer water gap model 2, a cut-off filter plate 11, a medium-long working distance microscope 13, a high-speed camera 14 and a sheet light source 12; the refractory material block 10 is pasted on the inner wall of the crystallizer water gap model 2, and weather-resistant glue can be selected for pasting;
the refractory material block 10 is a refractory material taken down from the inner wall of a real crystallizer water gap after molten steel pouring is finished;
the water prism 1 is connected with a crystallizer water gap model 2; the water prism 1 is arranged outside the crystallizer water gap model 2 and close to the liquid container;
the cut-off filter plate 11 is arranged outside the water prism 1 and close to the wall surface of the water prism 1;
the medium-long working distance microscope 13 is connected with the high-speed camera 14; the medium-long working distance microscope 13 is located on the outer side of the water prism 1 and is 50-60 cm away from the outer wall of the water prism 1.
The sheet light source 12 is arranged outside the water prism 1 and is 10-30 cm away from the outer wall of the water prism 1.
In this embodiment, the long and medium working distance microscope 13 is disposed in front of the high-speed camera 14, the working distance of the long and medium working distance microscope 13 is 45-60 cm, the working distance is greater than that of a conventional microscope, a millimeter-scale flow field near the inner wall surface of the mold nozzle model 2 can be studied, and measurement of the millimeter-scale flow field is difficult.
In this embodiment, when the weather-resistant adhesive is used for adhering or sealing, after the weather-resistant adhesive is applied, the weather-resistant adhesive needs to wait for more than 6 hours under a dry condition to ensure that the weather-resistant adhesive is completely solidified
In the present embodiment, the water prism 1 is used for photographing tracer particles in a mold nozzle model 2 with curvature.
In this embodiment, the cut-off filter 11 is used to eliminate the reflected light from the inner wall of the mold gate model 2, and only the fluorescence of the trace particles is allowed to pass through the cut-off filter 11.
In this embodiment, the cut-off filter 11 is used to filter out visible light with a wavelength of less than 540 nm.
In this embodiment, the crystallizer nozzle model 2 and the water prism 1 are made of light-transmitting organic materials, and the refractive index of the organic materials is close to that of water.
In this embodiment, the refractory block 10 has dimensions of 10mm in length, 15mm in width and 1mm in thickness.
In this embodiment, the liquid pump is a water pump 6; the liquid storage container is a water tank 3; the control system is a computer.
In this and other embodiments, the water pump 6 is a self-priming pump.
In this embodiment, the apparatus further comprises a flow meter 7; the flowmeter 7 is arranged between the liquid pump and the speed measuring system.
In this embodiment, the liquid storage container, the flow meter 7 and the speed measuring system are communicated by a connecting water pipe 4.
In this embodiment, the flowmeter 7 is a rotameter, and the rotameter needs to be vertically placed.
Referring to fig. 3, in this embodiment and other embodiments, a method for measuring speed of particle images in a flow field on an inner wall of a mold nozzle model 2 is provided, where the method uses the above apparatus to simulate the flow field at the mold nozzle and measure the speed of the flow field, so as to obtain flow field information of the simulated mold nozzle, where the flow field information includes a transient flow field speed, a time-averaged flow field speed, a flow field pulsation speed, shear and swirl strength, a turbulent kinetic energy, and a reynolds stress.
In this embodiment and other embodiments, the method specifically includes the following steps:
s1, water is filled in the liquid storage container, the crystallizer water gap model 2 and the water prism 1, a graduated scale is placed in the measuring area, the position and the focal length of the medium-long working distance microscope 13 are adjusted until scales on the graduated scale are clear and recognizable, and the size of the measuring area is calibrated by using a control system;
s2, starting a liquid pump, and sowing tracer particles into a liquid storage container; adjusting the thickness of the sheet of light in the measurement area of the sheet light source 12;
s3, after the reading of the flowmeter 7 is stable, the control system sets the time interval of two laser beams and the exposure times of the camera, so that the maximum displacement of the tracer particle motion in the flow field under two exposures is between 5 and 10 pixels;
s4, emitting laser by the light source 12 and synchronously exposing by the camera; and after exposure, the camera transmits the picture with the particle image into the control system, and the control system is used for analyzing the flow field result to finally obtain the flow field information of the simulated crystallizer water gap. The measurement area is within a few millimeters of the position of the refractory block 10 and its surroundings, and specifically, several millimeters need to be based on actual measurement.
In this and other embodiments, the control system has a built-in cross-correlation algorithm.
In this embodiment and other embodiments, the computer is installed with a particle image velocimetry business software davis8.4.0 software, and the software is used for image acquisition control and image post-processing (cross-correlation algorithm calculates flow field information) on the flow field at the crystallization nozzle model.
In this and other embodiments, the control system is a computer.
In this example, the tracer particles have a diameter of 10 μm, a maximum excitation wavelength of 570nm and a maximum emission wavelength of 610 nm.
In another embodiment, the tracer particles have a diameter of 1 μm.
In other embodiments, the tracer particles have a diameter of 55 μm.
In this and other embodiments, the sheet of light has a thickness of 1 mm.
In this and other embodiments, the sheet light source 12 emits laser light of 532nm wavelength green light emitted by a Nd: YAG laser.
In this embodiment and other embodiments, in the method, during speed measurement, the water quantity contained in the water prism 1 is taken as the standard to cover the measurement area; the water quantity in the liquid storage container is based on the water filling of the crystallizer water gap model 2.
In this and other embodiments, the sheet light source 12 emits laser light twice, and the camera is synchronously exposed twice.
In this and other embodiments, when adjusting the position and focal length of the medium-and-long working distance microscope 13, the adjustment is required until the fluorescent trace particles in the measurement area are clearly distinguishable; if the number of the trace particles in the measurement area is too small, the trace particles need to be supplemented into the liquid storage container.
In this embodiment and other embodiments, the relationship between the flow rate of the fluid in the crystallization nozzle and the continuous casting slab is as follows: the faster the continuous casting billet is pulled, the larger the fluid flow in the water gap of the crystallizer is, according to the mass conservation theorem, the pulling speed v (m/min), the width a (m) of the section of the casting blank, the thickness b (m) of the section of the casting blank, and the cross-sectional area s (m) in the water gap of the crystallizer2) And the flow rate Q (m) in the water port of the crystallizer3Min) has the following relationship:
according to the formula (1), the information of the inner wall flow field of the crystallizer water gap model 2 at different pulling speeds (different flow rates) can be measured.
In this embodiment and other embodiments, the specific content of the flow field result analysis performed by the control system is as follows:
dividing a flow field area acquired by a camera into a plurality of inquiry domain windows;
extracting the gray function at the time of flow field t as F (i, j) and the gray function at the time of t +. DELTA.t as G (i, j) at each query domain window (i, j), and substituting into a cross-correlation function:
R(x,y)＝F(i,j)×G(i+x,j+y)＝F(i,j)×F(i+x-△x,j+y-△y)
r (x, y) is a cross-correlation function, the cross-correlation function obtains a peak value at a point (delta x, delta y), the (delta x, delta y) is a two-dimensional vector, namely the particle motion displacement at the inquiry domain window (i, j) under the time interval delta t; (ii) the velocity of the trace particle at (i, j) × (i, j) ═ Δ x/Δ t, vy (i, j) ═ Δ y/Δ t;
vx (i, j) is the x-direction velocity component at (i, j) in the flow field, vy (i, j) is the y-direction velocity component at (i, j) in the flow field, and Δ t is the time interval of the two beams of laser.
In this embodiment and other embodiments, the device and the method are applied to a straight-through crystallizer nozzle in a certain domestic factory, a model of the straight-through crystallizer nozzle is placed in the device, and then the method is adopted to carry out inner wall flow field particle image velocity measurement on the model of the straight-through crystallizer nozzle.
The inner diameter of the straight-through crystallizer nozzle is 40mm, the section of a casting blank is 220mm multiplied by 260mm, the pulling speed is 0.9m/min, and the water flow at the crystallizer nozzle model 2 is 41L/min according to the formula (1).
The device and the method for measuring the speed of the particle image of the inner wall flow field of the mold nozzle model of the crystallizer provided by the embodiment of the application are introduced in detail above. The above description of the embodiments is only for the purpose of helping to understand the method of the present application and its core ideas; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
As used in the specification and claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect. The description which follows is a preferred embodiment of the present application, but is made for the purpose of illustrating the general principles of the application and not for the purpose of limiting the scope of the application. The protection scope of the present application shall be subject to the definitions of the appended claims.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The foregoing description shows and describes several preferred embodiments of the present application, but as aforementioned, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the application as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the application, which is to be protected by the claims appended hereto.
Claims (10)
1. A device for measuring speed of particle images of a flow field on the inner wall of a mold nozzle of a crystallizer is characterized by comprising:
the liquid storage container is used for containing liquid simulating a crystallization water gap flow field;
the speed measurement system is used for measuring the speed of the particles in the flow field on the inner wall of the crystallizer nozzle model;
the liquid pump is used for pumping liquid with trace particles into the crystallizer water gap model and controlling the flow rate of the liquid;
the control system is used for controlling the liquid storage container, the liquid pump and the speed measuring system and calculating the speed of the flow field particles;
the liquid storage container, the liquid pump and the speed measuring system are communicated in a closed mode;
the liquid pump and the speed measuring system are respectively arranged at two ends of the liquid storage container;
the control system is in communication connection with the liquid storage container, the liquid pump and the speed measuring system;
the speed measurement system simulates the roughness of the inner wall of the crystallizer nozzle by arranging refractory materials on the inner wall of the crystallizer nozzle model, so that the speed measurement is carried out on the flow field of the inner wall of the crystallizer nozzle model.
2. The device for measuring the speed of the particle image in the inner wall flow field of the mold nozzle model of the crystallizer according to claim 1, wherein the speed measuring system comprises: the device comprises a water prism, a refractory material block, a crystallizer water gap model, a cut-off filter, a medium-long working distance microscope, a high-speed camera and a sheet light source;
the refractory material block is adhered to the inner wall of the crystallizer water gap model;
the water prism is connected with a crystallizer water port model; the water prism is arranged outside the crystallizer water port model and close to the liquid container;
the cut-off filter is arranged outside the water prism and close to the wall surface of the water prism;
the medium and long working distance microscope is connected with the high-speed camera;
the medium and long working distance microscope is positioned outside the water prism;
the sheet light source is arranged outside the water prism.
3. The device for measuring the speed of the particle image of the inner wall flow field of the mold nozzle model according to claim 1, wherein the mold nozzle model and the water prism are made of light-transmitting organic materials.
4. The device for measuring the speed of the particle image of the inner wall flow field of the mold nozzle model of the crystallizer according to claim 1, wherein the liquid pump is a water pump; the liquid storage container is a water tank; the control system is a computer.
5. The device for measuring the speed of the particle image of the inner wall flow field of the mold nozzle model of the crystallizer as claimed in claim 1, further comprising a flow meter; the flowmeter is arranged between the liquid pump and the speed measuring system.
6. A method for measuring the speed of particle images of a flow field on the inner wall of a mold nozzle model of a crystallizer by using the device as claimed in any one of claims 1-4, which is characterized by comprising the following steps:
s1, water is filled in the liquid storage container, the crystallizer water gap model and the water prism, a graduated scale is placed in the measuring area, the position and the focal length of the medium-long working distance microscope are adjusted until scales on the graduated scale are clear and recognizable, and the size of the measuring area is calibrated by using a control system;
s2, starting a liquid pump, and sowing tracer particles into a liquid storage container; adjusting the thickness of the sheet light source in the measurement area;
s3, after the flow meter reading is stable, the control system sets the time interval of two laser beams and the exposure times of the camera, so that the maximum displacement of the tracer particle motion in the flow field under two exposures is between 5 and 10 pixels;
s4, emitting laser by the sheet light source, and synchronously exposing by the camera; and after exposure, the camera transmits the picture with the particle image into the control system, and the control system is used for analyzing the flow field result to finally obtain the flow field information of the simulated crystallizer water gap.
7. The method for measuring the speed of the particle image of the flow field on the inner wall of the mold nozzle model of the crystallizer as claimed in claim 6, wherein the diameter of the trace particle is 1-55 μm, the maximum excitation wavelength is 570nm, and the maximum emission wavelength is 610 nm.
8. The method for measuring the speed of the particle image of the inner wall flow field of the mold nozzle model of the crystallizer as claimed in claim 6, wherein the thickness of the sheet light is 1 ± 0.5 mm.
9. The method for measuring the speed of the particle image of the inner wall flow field of the mold nozzle model of the crystallizer as claimed in claim 6, wherein the method is characterized in that during the speed measurement, the water quantity filled in the water prism is taken as the standard for covering the measurement area; the water quantity in the liquid storage container is based on the water filling capacity of the crystallizer water gap model.
10. The method for measuring the speed of the particle image of the flow field inside the mold nozzle of the crystallizer according to claim 6, wherein when the position and the focal length of the microscope with the medium-long working distance are adjusted, the adjustment is required until fluorescent tracer particles in a measurement area are clear and distinguishable; if the number of the trace particles in the measurement area is too small, the trace particles need to be supplemented into the liquid storage container.
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