CN114414201B - Visual device of celadon kiln internal flow field simulation - Google Patents
Visual device of celadon kiln internal flow field simulation Download PDFInfo
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- CN114414201B CN114414201B CN202111683422.XA CN202111683422A CN114414201B CN 114414201 B CN114414201 B CN 114414201B CN 202111683422 A CN202111683422 A CN 202111683422A CN 114414201 B CN114414201 B CN 114414201B
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
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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 provides a celadon kiln internal flow field simulation visualization device. An internal flow field simulation visualization device of a celadon kiln, comprising: the scaling model body comprises a model shell and a bottom plate; the smoke simulation assembly comprises a fan for generating air flow, a trace particle generator for generating trace particles and an air flow pipeline for conveying and mixing the air flow and the trace particles to form simulated smoke; a laser tracing assembly includes a laser generator for generating laser light and a prism for at least partially altering the optical path of the laser light. According to the invention, the celadon kiln prototype is simulated with higher simulation degree by the scaling model main body, and the flow track of simulated smoke in the scaling model main body is displayed in a visual form through laser irradiation by utilizing the difference of the laser reflectivity of trace particles and air, so that the simulation analysis of the actual kiln flow field of the celadon kiln prototype is facilitated.
Description
Technical Field
The invention relates to a flow field simulation visualization device, in particular to a celadon kiln internal flow field simulation visualization device, and belongs to the technical field of kilns.
Background
In recent years, along with the development of the automation field, the automatic shuttle kiln has been widely used on white porcelain with lower requirements in the firing process, thereby effectively reducing the production cost of the white porcelain and greatly saving the kiln firing time. However, unlike white porcelain, celadon is very sensitive to temperature fields and redox atmospheres during firing, and typically yields less than 60%. Such low yields not only add significant time, labor costs, but also waste significant energy.
In the firing process of celadon, a speed field and a pressure field in a kiln are critical factors for influencing the internal temperature field of the celadon kiln in a steady state. In practical situations, the measurement of the speed field and the pressure field of a real kiln is very difficult, and the numerical simulation of the real kiln also requires that experimental data be supported, but in the prior art, although flow field tracing devices for some technical fields exist, effective simulation devices for the flow fields inside the kiln, especially the celadon kiln, are very lacking.
Disclosure of Invention
Based on the background, the invention aims to provide the celadon kiln internal flow field simulation visualization device which provides a basis for analysis of the celadon kiln internal flow field and solves the problems in the background technology.
In order to achieve the above object, the present invention provides the following technical solutions:
an internal flow field simulation visualization device of a celadon kiln, comprising:
the scaling model body comprises a model shell and a bottom plate, wherein the model shell is provided with a simulated flue gas inlet oriented to the vertical direction of the model shell and a simulated flue gas outlet oriented to the transverse direction of the model shell, the model shell is at least provided with one transparent side wall extending along the transverse direction of the model shell, an inner cavity is formed in the model shell, the bottom of the model shell is provided with an opening, and the bottom plate is detachably and fixedly connected to the bottom of the model shell and seals the opening at the bottom of the model shell;
the smoke simulation assembly comprises a fan for generating air flow, a trace particle generator for generating trace particles and an air flow pipeline for conveying and mixing the air flow and the trace particles to form simulated smoke, wherein the fan and the trace particle generator are respectively connected with the air flow pipeline and are communicated with a simulated smoke inlet through the air flow pipeline;
the laser tracing assembly comprises a laser generator for generating laser and a prism for at least partially changing a laser path, wherein the laser generator is arranged on the top wall surface of the inner cavity of the model shell and opposite to the simulated smoke inlet, the prism is arranged on the side wall surface of the inner cavity of the model shell, and at least one part of the prism is positioned on the laser initial path generated by the laser generator.
Under the drive of the air current that the fan produced, follow the simulation flue gas export after the simulation flue gas import passes through model casing inner chamber and discharge, the tracer particle in the simulation flue gas is irradiated by the laser that laser tracer subassembly produced, because there is the difference in tracer particle and air to the reflectivity of laser, the trace of movement of tracer particle in model casing inner chamber can be gathered the record by outside particle image acquisition system and realize the visualization, realizes the effective simulation to celadon kiln inside flow field through above-mentioned technical scheme.
Preferably, the cross-sectional area of the simulated flue gas inlet is calculated by using the following equation of the stoneley-neuye method:
wherein f is the sectional area of the simulated flue gas inlet, f l Is the sectional area of a celadon kiln flue gas inlet, ρ 0 To simulate the gas flow density of the flue gas inlet ρ l The smoke density is the smoke density at the characteristic temperature of the celadon kiln, and l is the reduction ratio of the shrinkage ratio model main body relative to the prototype of the celadon kiln.
The structural size of the scaling model main body is obtained by scaling down the celadon kiln prototype according to a modeling theory, but because the kiln internal process of the celadon kiln prototype is a non-isothermal power process, the local correction of the scaling model main body can enable the simulation result to be closer to the actual non-isothermal power process in the celadon kiln prototype, the simulation flue gas inlet size of the scaling model main body is corrected by adopting a Stirling-Neubye method formula, the combustion process outside the simulation flue gas inlet as a simulation burner is essentially moved forward into the simulation flue gas inlet to simulate the change of the air flow density and the speed caused by the combustion, so that the processing leads the outlet of the simulation burner to be distorted, but the average speed of the simulation flue gas in the inner cavity of the model shell is closer to the flue gas speed in the actual kiln internal state condition of the celadon kiln prototype, and the simulation result is improved in the authenticity.
Preferably, the simulated flue gas inlets are arranged at the bottom of the model shell, a plurality of simulated flue gas inlets are arranged, and the simulated flue gas inlets are symmetrically distributed at two sides of the opening at the bottom of the model shell.
Preferably, the scaling model main body further comprises a plurality of kiln frames, the kiln frames are detachably and fixedly connected to the bottom plate, and the bottom plate is provided with a plurality of through holes for connecting the kiln frames.
The kiln frame is arranged to further improve the simulation of a celadon kiln prototype, the kiln frame is detachably and fixedly connected with the bottom plate through the through holes, when the kiln frame is not arranged, the through holes can be used as measuring holes, and an external pitot tube penetrates through the through holes to enter the inner cavity of the model shell so as to perform pressure measurement.
Preferably, the model shell is a rectangular body with an aspect ratio ranging from 1.5 to 3 and an aspect ratio ranging from 1 to 1.5, the ratio of the width of the bottom plate to the width of the bottom surface of the model shell is 1/4 to 1/3, the kiln frames are arranged at intervals, the ratio of the distance between the kiln frames to the diameter of the kiln frames is 2 to 3, and the ratio of the height of the kiln frames to the height of the model shell is 0.7 to 0.9.
Preferably, the material of the model shell and the bottom plate is glass or transparent ceramic.
When cold state (< 100 ℃) experiment is carried out, the model shell and the bottom plate can be made of glass, especially organic glass, and when hot state (< 1200 ℃) experiment is carried out, the model shell and the bottom plate can be made of high temperature resistant transparent ceramics such as AlON ceramics (AlON ceramics).
Preferably, the air flow pipeline comprises an air flow pipeline, a trace particle pipeline and an air flow mixing pipeline, the air flow pipeline is communicated with the fan and the air flow mixing pipeline, the trace particle pipeline is communicated with the trace particle generator and the air flow mixing pipeline, the air flow pipeline and the trace particle pipeline are communicated with the simulated smoke inlet through the air flow mixing pipeline, and the air flow mixing pipeline is provided with a valve and a flowmeter.
The simulated flue gas flow formed by mixing the air flow and the trace particles is measured through the flowmeter, and based on the measurement result, the simulated flue gas flow entering the simulated flue gas inlet is regulated and controlled in real time through the valve.
Preferably, the tracer particle generator is provided with a pitot tube, the tracer particles are water mist, fine particles after combustion of combustible substances or a mixture of the two substances, and the water mist is obtained by dry ice sublimation, water heating evaporation or water ultrasonic atomization.
The air flow velocity at the outlet of the trace particle generator is measured and the flow is calculated through the pitot tube, and the output of the trace particle generator is adjusted according to the flow so as to control the carrying amount of trace particles in the air.
Preferably, the connection end of the airflow pipeline and the simulated flue gas inlet is provided with a nozzle, the nozzle faces to the direction of the simulated flue gas inlet, and the nozzle is in a diameter tapered shape.
Preferably, the laser generator generates laser with a wavelength of 450nm to 532nm.
The reflectivity of the trace particles and the reflectivity of the air for the laser light in the wavelength range are greatly different, so that the visualization degree of the trace particles can be improved.
Preferably, the plurality of the laser generators are provided, the plurality of the prisms are provided, each laser generator corresponds to one group of prisms, and the prisms in each group are uniformly arranged at intervals along the initial light path of the laser generated by the corresponding laser generator.
The prisms are beneficial to forming a plurality of laser reflection light paths intersecting the laser initial light path to form a laser plane, and the tracer particles are better irradiated to be visualized.
Compared with the prior art, the invention has the following advantages:
according to the invention, the simulation visualization device for the internal flow field of the celadon kiln is used for simulating the prototype of the celadon kiln with a scaling model main body to a higher degree, trace particles are mixed into air to be used as simulation smoke, the difference of the trace particles and the air on the laser reflectivity is utilized, and the flow track of the simulation smoke in the scaling model main body is displayed in a visualized mode through laser irradiation, so that simulation analysis is conveniently carried out on the actual kiln flow field of the prototype of the celadon kiln, and a research basis is provided for optimization.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a schematic side view of the kiln frame and floor of the present invention;
FIG. 3 is a graph of flow resistance versus Re;
FIG. 4 is a schematic perspective view of an airflow pipeline according to the present invention;
FIG. 5 is a schematic view of the orientation of the arrangement of the prisms of the present invention;
fig. 6 is a schematic installation view of the laser generator of the present invention.
In the figure: 1. a model housing; 2. a kiln frame; 3. a bottom plate; 4. simulating a flue gas inlet; 5. a ball valve; 6. a trace particle generator; 7. a three-way valve; 8. a four-way valve; 9. a blower; 10. simulating a flue gas outlet; 11. a laser generator; 12. a prism; 13. an air flow main pipeline; 14. an air flow inlet line; 15. an air flow outlet pipeline; 16. a trace particle pipeline; 17. an air flow mixing pipeline; 18. a fixed support; 19. penetrating through the round hole; 20. a transparent filter; 21. and a through hole.
Detailed Description
The technical scheme of the invention is further specifically described below through specific embodiments and with reference to the accompanying drawings. It should be understood that the practice of the invention is not limited to the following examples, but is intended to be within the scope of the invention in any form and/or modification thereof.
In the present invention, unless otherwise specified, all parts and percentages are by weight, and the equipment, materials, etc. used are commercially available or are conventional in the art. The methods in the following examples are conventional in the art unless otherwise specified. The components and devices in the following examples are, unless otherwise indicated, all those components and devices known to those skilled in the art, and their structures and principles are known to those skilled in the art from technical manuals or by routine experimentation.
The embodiment of the invention provides a celadon kiln internal flow field simulation visualization device which comprises a scaling model main body, a smoke simulation assembly and a laser tracing assembly. The scaling model body comprises a model shell 1 and a bottom plate 3, wherein the model shell 1 is provided with a simulated flue gas inlet 4 facing the vertical direction of the model shell 1 and a simulated flue gas outlet 10 facing the transverse direction of the model shell 1, the model shell 1 is provided with at least one transparent side wall extending along the transverse direction of the model shell 1, an inner cavity is formed in the model shell 1, an opening is formed in the bottom of the model shell 1, and the bottom plate 3 is detachably and fixedly connected to the bottom of the model shell 1 and seals the opening of the bottom of the model shell 1. The flue gas simulation assembly comprises a fan 9 for generating air flow, a trace particle generator 6 for generating trace particles, and an air flow pipeline for conveying and mixing the air flow and the trace particles to form simulated flue gas, wherein the fan 9 and the trace particle generator 6 are respectively connected with the air flow pipeline and are communicated with the simulated flue gas inlet 4 through the air flow pipeline. The laser tracer assembly comprises a laser generator 11 for generating laser and a prism 12 for at least partially changing the laser path, wherein the laser generator 11 is arranged on the top wall surface of the inner cavity of the model shell 1 and opposite to the simulated smoke inlet 4, the prism 12 is arranged on the side wall surface of the inner cavity of the model shell 1, and at least one part of the prism 12 is positioned on the laser initial path generated by the laser generator 11.
According to the visual simulation device for the internal flow field of the celadon kiln, simulated flue gas is driven by air flow generated by the fan 9, is discharged from the simulated flue gas outlet 10 after passing through the inner cavity of the model shell 1 through the simulated flue gas inlet 4, trace particles in the simulated flue gas are irradiated by laser generated by the laser tracing component, and due to the fact that the difference exists between the trace particles and the reflectivity of air to the laser, the movement track of the trace particles in the inner cavity of the model shell 1 can be acquired and recorded by an external particle image acquisition system to realize visualization, so that effective simulation of the internal flow field of the celadon kiln is realized.
As shown in fig. 1, the scaled model body includes a model housing 1, a bottom plate 3, and a plurality of kiln frames 2 provided at intervals to the bottom plate 3. The mould shell 1 is provided with eight analogue flue gas inlets 4 oriented in the vertical direction of the mould shell 1 and two analogue flue gas outlets 10 oriented in the transverse direction of the mould shell 1. The mold shell 1 has an interior cavity inside, and the mold shell 1 has at least one transparent side wall extending in the transverse direction of the mold shell 1, so that the interior cavity of the mold shell 1 is visible to the outside. The bottom of the model shell 1 is provided with an opening, and the bottom plate 3 is detachably and fixedly connected to the bottom of the model shell 1 and seals the opening at the bottom of the model shell 1. The simulated flue gas inlets 4 are arranged at the bottom of the model shell 1 and symmetrically distributed at two sides of the opening at the bottom of the model shell 1. As shown in fig. 2, the kiln frame 2 is detachably and fixedly connected to the bottom plate 3, and the bottom plate 3 is provided with a plurality of through holes 21 for connecting the kiln frame 2. The model shell 1 is a rectangular body with an aspect ratio ranging from 1.5 to 3 and an aspect ratio ranging from 1 to 1.5, the ratio of the width of the bottom plate 3 to the width of the bottom surface of the model shell 1 is 1/4 to 1/3, the ratio of the interval between kiln frames 2 to the diameter of the kiln frames 2 is 2 to 3, and the ratio of the height of the kiln frames 2 to the height of the model shell 1 is 0.7 to 0.9. Of course, the number of the simulated flue gas inlets 4, the number of the simulated flue gas outlets 10, the number of the bottom openings of the model shell 1, the structural size of the bottom plate 3 and the structural size of the kiln frame 2 can be adjusted according to practical application scenes.
In this embodiment, the materials of the model housing 1 and the bottom plate 3 are made of high temperature resistant transparent ceramic AlON ceramics (AlON ceramics) to be suitable for thermal state (< 1200 ℃) test. In a further embodiment, the mould shell 1 and the base plate 3 can also be made of glass, in particular plexiglas, in order to accommodate cold (< 100 ℃) experiments.
In the embodiment, the structural size of the scaled model main body is obtained by scaling down a celadon kiln prototype according to a modeling theory. Modeling theory is often applied to the fields of aerospace, waterpower and the like, and a large amount of materials are consumed for constructing an equal-proportion model, and the modeling theory is limited by time, space, experimental conditions and the like. The model which is similar to the prototype and is built under the guidance of the similarity theory can calculate the corresponding result of the prototype structure according to the model test result, so that a scaling model is built for the large combustion kiln, and the simulation of the internal airflow force field is an economically feasible scheme.
The similarity principle is used as a theoretical basis for model research, and is required to ensure that the model is similar to the flow of the prototype, so that a second similarity theorem must be observed: 1. whether the flow in the model or the prototype should be represented by the same complete system of equations, this requires the flow medium to be the same; 2. the fluid channels must be geometrically similar; 3. fluid properties at corresponding locations are similar; 4. the velocity profile of the inlet and outlet cross sections must be similar; 5. the initial conditions of flow must be similar for unsteady state; 6. the qualitative criterion number of flows is equal.
This example uses a method of approximate simulation study to study the prevailing conditions affecting flow. The cold simulation uses room temperature air as a medium and the measurement is performed at steady state. For kilns, the flow in the kiln is a pressurized flow, and the criterion number that determines is the reynolds number (Re). The effect of Re on flow is divided into three states, two thresholds, the first being referred to as the first threshold and the second being referred to as the second threshold. Since the Re criterion determines the state of fluid flow, when the Re number is less than the first critical value, the flow enters the first self-modeling zone, assuming a laminar flow state, where the flow state is independent of the Re number, i.e., the velocity profiles are similar to each other regardless of the flow rate. When the Re number is between the first and second critical values, the flow is in an intermediate state of transition from laminar to turbulent flow, and the flow velocity distribution is closely related to the size of the Re criterion. When the Re number continues to increase beyond the second threshold, and the flow regime reaches turbulent flow, the flow enters the second self-modeling zone where the flow regime and flow velocity profile are similar regardless of the Re number, as shown in fig. 3, and the flow resistance is independent of Re when Re is sufficiently large. In general, the second critical value of the water modulus Re number is 10 4 The second critical value of the air modulus Re number is taken as 5 multiplied by 10 4 。
Therefore, the study of the model does not have to absolutely follow the similar conditions proposed by the second law of similarity, but only guarantees the following aspects: 1. geometric similarity of model and prototype; 2. because the number of each flow Re in the original kiln is far greater than a second critical value, the flow state of the air flow in the model is ensured to be in a second self-model area; 3. to ensure that the boundary conditions of the model and the prototype are similar, the momentum ratio of each air flow in the model and the prototype kiln are equal.
However, because the kiln internal process of the celadon kiln prototype is a non-isothermal power process, the simulation result can be more approximate to the actual non-isothermal power process in the celadon kiln prototype by locally correcting the scaling model main body, and therefore, the sectional area of the simulated flue gas inlet 4 is calculated by adopting the following equation of the stonebye method:
wherein f is the sectional area of the simulated flue gas inlet 4, f l Is the sectional area of a celadon kiln flue gas inlet, ρ 0 To simulate the gas flow density of the flue gas inlet 4 ρ l The smoke density is the smoke density at the characteristic temperature of the celadon kiln, and l is the reduction ratio of the shrinkage ratio model main body relative to the prototype of the celadon kiln.
The essence of the correction is that the combustion process outside the simulated flue gas inlet 4 serving as the simulated burner is advanced into the simulated flue gas inlet 4 to simulate the change of the air flow density and the speed caused by combustion, so that the outlet of the simulated burner is distorted, but the average speed of the simulated flue gas in the inner cavity of the model shell 1 is more approximate to the flue gas speed in the actual kiln of the celadon kiln prototype, and the simulation result is improved in the simulation.
In a further embodiment, where the scaled mould body is not provided with a kiln frame 2 and the through-holes 21 are used as measuring holes, external pitot tubes can be passed through the through-holes 21 into the inner cavity of the mould shell 1 for pressure measurement.
The flue gas simulation assembly comprises a fan 9 for generating air flow, a trace particle generator 6 for generating trace particles, and an air flow pipeline for conveying and mixing the air flow and the trace particles to form simulated flue gas, wherein the fan 9 and the trace particle generator 6 are respectively connected with the air flow pipeline and are communicated with the simulated flue gas inlet 4 through the air flow pipeline.
In the present embodiment, the fan 9 is a centrifugal fan 9 that sends an air flow into an air flow line. In other embodiments, the centrifugal fan 9 may be provided with a filter, and the filter core of the filter is composed of a low-efficiency filter core, a medium-efficiency filter core and a high-efficiency filter core, so as to filter fine particles with the particle size of less than 0.5 micron in the air, thereby reducing the influence of dust particles in the air flow on laser tracing in the scaling model body.
The trace particle generator 6 is a device for ultrasonically atomizing water and then mixing fine particles after combustion of combustible substances to generate a mixture of water mist and fine particles in the present embodiment. In further embodiments, the tracer particle generator 6 can also generate a mist by sublimation of dry ice or by evaporation at elevated temperatures. Alternatively, the tracer particle generator 6 is provided with a pitot tube, the flow rate of the air at the outlet of the tracer particle generator 6 is measured and the flow rate is calculated by the pitot tube, and the output of the tracer particle generator 6 is adjusted according to the flow rate to control the carrying amount of the tracer particles in the air.
The air flow pipeline comprises an air flow pipeline, a trace particle pipeline 16 and an air flow mixing pipeline 17, the air flow pipeline is communicated with the fan 9 and the air flow mixing pipeline 17, the trace particle pipeline 16 is communicated with the trace particle generator 6 and the air flow mixing pipeline 17, the air flow mixing pipeline 17 is communicated with the air flow pipeline and the trace particle pipeline 16 to the simulated flue gas inlet 4, and a valve and a flowmeter are arranged on the air flow mixing pipeline 17.
In this embodiment, as shown in fig. 4, the air flow pipeline specifically comprises an air flow main pipeline 13, two air flow inlet pipelines 14 and eight air flow outlet pipelines 15, two fans 9 are correspondingly arranged, eight trace particle pipelines 16 are correspondingly arranged, eight trace particle generators 6 are correspondingly arranged, and eight air flow mixing pipelines 17 are correspondingly arranged and correspond to eight simulated flue gas inlets 4. The two air flow inlet pipelines 14 respectively connect the two fans 9 to the air flow main pipeline 13, the air flow main pipeline 13 divides the air flow into eight air flow outlet pipelines 15, each air flow outlet pipeline 15 is connected with the bottom end of one air flow mixing pipeline 17, meanwhile, the bottom end of the air flow mixing pipeline 17 is also connected with one trace particle generator 6 through one trace particle pipeline 16, and the top end of the air flow mixing pipeline 17 is connected with one simulated flue gas inlet 4. Each airflow mixing pipeline 17 is provided with a ball valve 5 with a floating ball flowmeter, so that the functions of a valve and a flowmeter are realized, the flow of the simulated smoke formed by mixing air flow and trace particles is measured through the floating ball flowmeter, and based on the measurement result, the flow of the simulated smoke entering the simulated smoke inlet 4 is regulated and controlled in real time through the ball valve 5.
In this embodiment, the above-mentioned pipeline adopts the silica gel hose to make to be equipped with three-way valve 7 and the cross valve 8 of a plurality of PVC materials in pipeline junction, above-mentioned pipeline can be directly plug with three-way valve 7 or cross valve 8, and the junction is fixed by stainless steel activity binding clip, guarantees that the gas tightness can dismantle simultaneously, makes things convenient for later stage to change and overhaul.
In this embodiment, the connection end of the airflow mixing pipeline 17 and the simulated flue gas inlet 4 is provided with a nozzle, the nozzle faces the direction of the simulated flue gas inlet 4, and the nozzle is in a diameter tapered shape.
The laser tracer assembly comprises a laser generator 11 for generating laser and a prism 12 for at least partially changing the laser path, wherein the laser generator 11 is arranged on the top wall surface of the inner cavity of the model shell 1 and opposite to the simulated smoke inlet 4, the prism 12 is arranged on the side wall surface of the inner cavity of the model shell 1, and at least one part of the prism 12 is positioned on the laser initial path generated by the laser generator 11.
In this embodiment, the laser generator 11 generates laser light having a wavelength of 450nm or 532nm. The reflectivity of the trace particles and the reflectivity of the air for the laser with the wavelength are greatly different, so that the visualization degree of the trace particles can be improved. Of course, the laser wavelength can also be chosen within a range between the two values mentioned above.
In the present embodiment, there are eight laser generators 11, each laser generator 11 corresponding to one simulated flue gas inlet 4. Eight groups of prisms 12 are provided, each group being provided with three prisms 12, each prism 12 being a 45 ° coated rectangular prism 12. Each laser generator 11 corresponds to a group of prisms 12, as shown in fig. 5, three prisms 12 in each group are uniformly spaced along the initial optical path of the laser generated by the corresponding laser generator 11, and the prisms 12 in opposite groups are respectively located on two side wall surfaces of the inner cavity of the model housing 1 and are in staggered arrangement. Part of laser output by the laser generator 11 can penetrate through the centers of the three prisms 12 and is projected in the range of +/-1/4 diameter of the center of the simulated flue gas inlet 4, and the other part of laser is reflected by the prisms 12 to form a new light path, and the new light path is perpendicular to the initial light path of the laser to form a laser plane for tracing the simulated flue gas. Wherein in each group of prisms 12 located on the same side, the shortest distance from the bottommost one prism 12 to the bottom surface of the model housing 1 is 0.35 times the height of the model housing 1, the pitch of the prisms 12 is 0.23 times the height of the model housing 1, and in the other group of prisms 12 on the other side, the shortest distance from the bottommost one prism 12 to the bottom surface of the model housing 1 is 0.23 times the height of the model housing 1, the pitch of the prisms 12 is 0.23 times the height of the model housing 1, thereby forming a staggered arrangement of the prisms 12 of the opposite group. The arrangement mode is beneficial to forming a plurality of laser reflection light paths intersecting with the laser initial light path to form a laser plane, and the tracer particles are better irradiated to be visualized. Of course, the number of the laser generators 11 and the number of the prisms 12 may be adjusted according to the actual application scene.
In this embodiment, as shown in fig. 6, a fixed support 18 is mounted on the body of the laser generator 11, a through round hole 19 matched with the laser generator 11 is provided at the top of the model housing 1, and the fixed support 18 is connected with the top of the model housing 1 by bolts. The detachable transparent filter 20 is arranged on the laser generator 11, so that a laser light source can be protected in simulated smoke carrying trace particles, the transparent filter 20 can be detached in the later stage, the transparent filter 20 is cleaned and dedusted, and the intensity of laser is ensured.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (6)
1. The utility model provides a celadon kiln inside flow field simulation visualization device which characterized in that: the celadon kiln internal flow field simulation visualization device comprises:
the scaling model body comprises a model shell (1) and a bottom plate (3), wherein the model shell (1) is provided with a simulated flue gas inlet (4) facing the vertical direction of the model shell (1) and a simulated flue gas outlet (10) facing the transverse direction of the model shell (1), the model shell (1) is at least provided with a transparent side wall extending along the transverse direction of the model shell (1), an inner cavity is formed in the model shell (1), the bottom of the model shell (1) is provided with an opening, the bottom plate (3) is detachably and fixedly connected to the bottom of the model shell (1) and seals the opening at the bottom of the model shell (1), the simulated flue gas inlet (4) is arranged at the bottom of the model shell (1), the simulated flue gas inlets (4) are arranged in a plurality, and the simulated flue gas inlets (4) are symmetrically distributed on two sides of the opening at the bottom of the model shell (1);
the smoke simulation assembly comprises a fan (9) for generating air flow, a trace particle generator (6) for generating trace particles, and an air flow pipeline for conveying and mixing the air flow and the trace particles to form simulated smoke, wherein the fan (9) and the trace particle generator (6) are respectively connected with the air flow pipeline and are communicated with a simulated smoke inlet (4) through the air flow pipeline, the trace particle generator (6) is provided with a pitot tube, and the trace particles are water mist, fine particles after combustion of combustible substances or a mixture of the two substances, and the water mist is obtained by dry ice sublimation, water heating evaporation or water ultrasonic atomization;
the laser tracing assembly comprises a laser generator (11) for generating laser and prisms (12) for at least partially changing a laser light path, wherein the laser generator (11) is arranged on the top wall surface of an inner cavity of the model shell (1) and is arranged at an even interval relative to a simulated flue gas inlet (4), the prisms (12) are arranged on the side wall surfaces of the inner cavity of the model shell (1), at least one part of the prisms (12) is positioned on the laser initial light path generated by the laser generator (11), the laser wavelength generated by the laser generator (11) is 450-532 nm, the laser generator (11) is provided with a plurality of prisms (12), the prisms (12) are provided with a plurality of groups, each of the prisms (12) in each group are uniformly arranged along the laser initial light path generated by the corresponding laser generator (11), the prisms (12) in the opposite groups are respectively positioned on two side wall surfaces of the inner cavity of the model shell (1) and are staggered, the prisms (12) in the opposite groups are positioned on the same side, the prisms (12) are positioned on the same side, the shortest distance from one prism (12) to the shell (1) is 0.35 times the height of the model shell (1) of the other prism (12) from the bottom surface (1) to the other prism (1) of the model 1), the shortest distance from the bottommost prism (12) to the bottom surface of the model shell (1) is 0.23 times of the height of the model shell (1), and the distance between the prisms (12) is 0.23 times of the height of the model shell (1).
2. The celadon kiln internal flow field simulation visualization device according to claim 1, wherein: the sectional area of the simulated flue gas inlet (4) is calculated by adopting the following equation of the Stein-Neuba method:
3. The celadon kiln internal flow field simulation visualization device according to claim 1, wherein: the scaling model main body further comprises a plurality of kiln frames (2), the kiln frames (2) are detachably and fixedly connected to the bottom plate (3), and the bottom plate (3) is provided with a plurality of through holes (21) for connecting the kiln frames (2).
4. A celadon kiln internal flow field simulation visualization device according to claim 3, characterized in that: the model shell (1) is a rectangular body with an aspect ratio ranging from 1.5 to 3 and an aspect ratio ranging from 1 to 1.5, the ratio of the width of the bottom plate (3) to the width of the bottom surface of the model shell (1) is 1/4 to 1/3, the kiln frames (2) are arranged at intervals, the ratio of the spacing of the kiln frames (2) to the diameter of the kiln frames (2) is 2 to 3, and the ratio of the height of the kiln frames (2) to the height of the model shell (1) is 0.7 to 0.9.
5. The celadon kiln internal flow field simulation visualization device according to claim 1, wherein: the air flow pipeline comprises an air flow pipeline, a trace particle pipeline (16) and an air flow mixing pipeline (17), wherein the air flow pipeline is communicated with a fan (9) and the air flow mixing pipeline (17), the trace particle pipeline (16) is communicated with a trace particle generator (6) and the air flow mixing pipeline (17), the air flow mixing pipeline (17) is communicated with the air flow pipeline and the trace particle pipeline (16) in the simulated flue gas inlet (4), and a valve and a flowmeter are arranged on the air flow mixing pipeline (17).
6. The celadon kiln internal flow field simulation visualization device according to claim 1, wherein: the connecting end of the airflow pipeline and the simulated flue gas inlet (4) is provided with a nozzle, the nozzle faces to the direction of the simulated flue gas inlet (4), and the nozzle is in a diameter tapered shape.
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