CN115031923B - PIV solid-state trace particle generation device, system and method - Google Patents
PIV solid-state trace particle generation device, system and method Download PDFInfo
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- CN115031923B CN115031923B CN202210705763.0A CN202210705763A CN115031923B CN 115031923 B CN115031923 B CN 115031923B CN 202210705763 A CN202210705763 A CN 202210705763A CN 115031923 B CN115031923 B CN 115031923B
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- 239000002245 particle Substances 0.000 title claims abstract description 209
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000010926 purge Methods 0.000 claims abstract description 50
- 238000000926 separation method Methods 0.000 claims abstract description 28
- 238000003756 stirring Methods 0.000 claims abstract description 25
- 238000007664 blowing Methods 0.000 claims abstract description 7
- 239000007787 solid Substances 0.000 claims description 27
- 238000012360 testing method Methods 0.000 claims description 21
- 238000002485 combustion reaction Methods 0.000 claims description 12
- 230000001965 increasing effect Effects 0.000 claims description 10
- 238000003760 magnetic stirring Methods 0.000 claims description 8
- 230000001276 controlling effect Effects 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 239000002344 surface layer Substances 0.000 claims description 4
- 238000000917 particle-image velocimetry Methods 0.000 description 27
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/45—Magnetic mixers; Mixers with magnetically driven stirrers
- B01F33/453—Magnetic mixers; Mixers with magnetically driven stirrers using supported or suspended stirring elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
- B01F2101/23—Mixing of laboratory samples e.g. in preparation of analysing or testing properties of materials
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Abstract
The application provides a PIV solid-state trace particle generating device, a PIV solid-state trace particle generating system and a PIV solid-state trace particle generating method, which comprise the following steps: the shell assembly comprises a top cover and a tank-shaped shell, wherein the top cover is provided with a feed inlet and a particle discharge outlet, and the lower end of the tank-shaped shell is closed; the stirring system comprises a stirring part positioned at the inner bottom of the tank-shaped shell and a power part positioned below the tank-shaped shell; the air inlet purging system comprises an air inlet, an air inlet purging disc and a flow equalizing plate, wherein the air inlet purging disc and the flow equalizing plate are positioned inside the tank-shaped shell, the air inlet is positioned on the outer wall of the tank-shaped shell, and a plurality of small holes are formed in the wall, facing the particle pile, of the air inlet purging disc; the cyclone separation system is positioned above the air inlet blowing system and comprises a cyclone air inlet, a particle collecting plate and a turbulent flow component, wherein the particle collecting plate is positioned above the flow equalizing plate, the cyclone air inlet is tangential to the outer wall of the tank-shaped shell, and the turbulent flow component is positioned above the particle collecting plate. The application can prevent particles from agglomerating, and improves the output efficiency of particles and the uniformity of particle flow.
Description
Technical Field
The application relates to the technical field of trace particles, in particular to a PIV solid trace particle generation device, a PIV solid trace particle generation system and a PIV solid trace particle generation method.
Background
The existing flow field measuring means are mainly divided into two types, one type is traditional contact type measurement, the method requires that a physical probe is placed in a flow field to be measured, and information such as the speed, the pressure and the like of the flow field to be measured is obtained through the contact of the probe and air flow, and the method is simple to operate, but any probe can cause interference to the flow field, so that the measuring precision is reduced; the second type of non-contact measurement requires a particle generating device and a particle scattering device, which are used for generating particles displaying the track of a flow field and scattering the particles uniformly, continuously and stably to a region to be detected, and displacement of the particles in different interpretation regions is obtained by continuously taking two frames of pictures within a known extremely short time interval, so that the velocity distribution of the particles, namely the velocity distribution of the flow field, is obtained. Typical representatives are laser measurement techniques such as laser doppler velocimetry (LDV, laser Doppler Velocimetry), particle image velocimetry (PIV, particle Image Velocimetry), and the like. The high-speed laser optical measurement system is widely applied to measurement of a flow field speed field due to the advantages of non-contact, no interference, transient state, large range and the like. A typical PIV system is composed mainly of an illumination system, an imaging system, an image processing system, and the like. The lighting system mainly comprises a continuous or double-cavity double-pulse laser, an optical path system, a sheet light source optical lens group and the like; the imaging system comprises a CCD frame-crossing camera, a filter, a lens and the like; the control system is mainly a signal synchronizer; the image processing system is mainly analysis software and a workstation. When the laser measuring technologies such as LDV, PIV and the like are used for particle flow measurement, trace particle generation and dissemination are guarantees for obtaining ideal measuring results, and are one of limiting conditions for restricting the application of the laser measuring technologies. In order to accurately measure the speed and structure of the flow field, the trace particles must have good following property, high scattering rate for laser, uniform scattering in the measuring area and proper concentration. Therefore, both trace particle generation and transport are critical, and particle stability at high temperatures is also a concern for combustion diagnostics.
The existing solid particle generator has the following defects: usually, an additional high-pressure air source is adopted for driving, and an additional flowmeter is needed for accurately measuring the air flow entering the combustion chamber, so that the use cost is increased; most particle generators directly blow the surface of a tracer particle stack body in a container by using high-speed air flow, and the tracer particles are wrapped and clamped by the air flow and enter a flow field test section through a fine nozzle, so that the problem of uneven dispersion of solid particles caused by blockage of an air path often occurs; the particle storage tank has a plurality of interfaces, the sealing is easy to fail, the sealing material cannot withstand high temperature, and the sealing material cannot be applied to a high-temperature high-pressure preheating combustion test.
Disclosure of Invention
In view of this, embodiments of the present application provide a PIV solid trace particle generating device, system, and method, which do not require an additional high-pressure air source, and do not change the air/fuel flow and the relative proportion thereof, and can avoid adding an additional flowmeter/flow controller; the sealing structure of the tank body is simplified, and the device is suitable for high-temperature high-pressure preheating combustion tests.
In a first aspect, an embodiment of the present application provides a PIV solid state trace particle generation device, including:
The shell assembly comprises a top cover and a tank-shaped shell which are connected, wherein the top cover is provided with a feed inlet and a particle discharge outlet, and the lower end of the tank-shaped shell is closed;
the stirring system comprises a stirring part and a power part, wherein the stirring part is positioned at the bottom in the tank-shaped shell, and the power part is positioned below the tank-shaped shell;
The air inlet purging system comprises an air inlet, an air inlet purging disc and a flow equalizing plate, wherein the air inlet purging disc and the flow equalizing plate are positioned in the tank-shaped shell, the air inlet is positioned on the outer wall of the tank-shaped shell, the air inlet and the air inlet purging disc are positioned at the same height and between the flow equalizing plate and the surface layer of the particle stack, and a plurality of small holes are formed in the wall, facing the particle stack, of the air inlet purging disc;
The cyclone separation system is located above the air inlet purging system and comprises a cyclone air inlet, a particle collecting plate and a turbulent flow component, the particle collecting plate is located above the flow equalizing plate, the cyclone air inlet is located on the outer wall of the tank-shaped shell and tangent to the outer wall, the height of the cyclone air inlet is higher than that of the particle collecting plate, the turbulent flow component is located above the particle collecting plate, and the turbulent flow component is used for forming swirling air flow and increasing turbulence of the air flow.
According to a specific implementation manner of the embodiment of the application, the turbulence assembly in the cyclone separation system comprises a turbulence plate and a turbulence plate upper connecting plate connected above the turbulence plate, wherein the turbulence plate is provided with rectangular plates with uniformly distributed round holes, a plurality of turbulence plates are uniformly distributed on the particle collecting plate along the circumferential direction, and planes of the turbulence plates penetrate through the center of the particle collecting plate.
According to a specific implementation manner of the embodiment of the application, the cyclone separation system further comprises a funnel structure, wherein the funnel structure is provided with a funnel, one end with a small opening, of the funnel structure is connected with the particle discharge outlet, and one end with a large opening of the funnel structure faces downwards; the height of the cyclone air inlet is positioned in the area between the particle collecting plate and the opening at the lower end of the hood.
According to a specific implementation manner of the embodiment of the application, the particle collecting plate is configured as a ring plate with a groove structure, the particle collecting plate is provided with a central opening, and the size of the opening is larger than that of the large end of the hood opening.
According to a specific implementation manner of the embodiment of the application, the stirring part of the stirring system is provided with a magnetic stirring rod, the power part is provided with a magnetic seat, the magnetic seat is provided with a knob for controlling the intensity of a magnetic field, and the magnetic stirring rod rotates under the action of the magnetic field.
According to a specific implementation manner of the embodiment of the application, the air inlet purge disc is arranged as an annular ring pipe, the small holes are uniformly distributed on the circumference of the annular ring pipe, and a certain included angle is formed between the axes of the small holes and the axis of the tank-shaped shell.
According to a specific implementation manner of the embodiment of the application, the flow equalizing plate is uniformly provided with a plurality of round holes with equal diameters.
According to a specific implementation manner of the embodiment of the application, the top cover is further provided with a pressure release valve installation interface and a pressure gauge installation interface, the particle discharge outlet is positioned at the center of the top cover, and the charging port, the pressure release valve installation interface and the pressure gauge installation interface are all arranged at the eccentric position of the top cover.
In a second aspect, an embodiment of the present application further provides a PIV solid trace particle generating system, configured to be used in a high-temperature and high-pressure preheating combustion test, where the PIV solid trace particle generating device according to any one of the first aspect, the system further includes a main gas path and a pipeline valve assembly connected to the main gas path, where the valve assembly includes a check valve, a ball valve, and a three-way joint sequentially disposed on a bypass gas path led from the main gas path, where the three-way joint is connected to the intake purge system and the cyclone separation system through two manifolds, where each of the two manifolds is provided with a needle valve, and a ratio of purge gas of the intake purge system to cyclone gas of the cyclone separation system is controlled by adjusting openings of the two needle valves.
In a third aspect, an embodiment of the present application further provides a PIV solid state tracer particle generation method, using a PIV solid state tracer particle generation system as described in the second aspect, the method comprising:
Adjusting the ball valve to control the air flow entering the PIV solid trace particle generating device from the main air path, and roughly adjusting the concentration of trace particles;
Regulating needle valves respectively connected with the air inlet purging system and the cyclone separation system, and finely regulating the concentration of trace particles to ensure that the ratio of purge gas to cyclone gas is in the range of 3:1-1:3;
And after the test is finished, closing the ball valve to cut off the air flow of the bypass air passage.
Advantageous effects
According to the PIV solid-state trace particle generating device, the PIV solid-state trace particle generating system and the PIV solid-state trace particle generating method, particle flow generated by an air inlet purging system is rectified on one side through the arrangement of the flow equalizing plate, and slag-bonding particles with larger particles are primarily screened out; on the other hand, the cyclone air flow generated by the cyclone separation system is prevented from affecting the rising of the air flow in the space below the flow equalizing plate, so that the particle output efficiency is affected.
Through setting up mixing system, prevent effectively that the particle from caking to increase particle generator's work efficiency, greatly simplified jar body seal structure for motor stirring device, be applicable to high temperature high pressure and preheat combustion test.
By the cyclone separation system, particles with larger particles have large mass and large inertia, cannot do spiral ascending motion along with the cyclone, collide with the wall surface of the turbulent flow plate under the action of inertia and then slide into the grooves of the particle collecting plate; the particles with smaller particles have small inertia and can do spiral ascending motion along with the cyclone, and then enter the blast cap and are discharged from the particle discharge port into the test section. The particle size of the trace particle flow is uniform, and the air flow following performance is good, so that the test precision of a flow field test is effectively improved.
Through setting up the hood, increased the area of particle discharge port, improved particle output efficiency.
Two manifolds connected with the air inlet blowing system and the cyclone separation system are respectively provided with a needle valve, and the proportion of blowing air and cyclone air is controlled by adjusting the opening of the two, so that the dual purposes of reasonably controlling the uniformity of particle size and particle concentration are achieved.
The invention does not need an extra high-pressure air source, does not change the air/fuel flow and the relative proportion thereof, and can avoid adding an extra flowmeter/flow controller.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view showing the overall structure of a particle generating apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic view showing an internal structure of a particle generating apparatus according to an embodiment of the present invention;
FIG. 3 is a top view of a particle generating apparatus according to an embodiment of the present invention;
FIG. 4 is a cross-sectional view taken along line A-A in FIG. 2;
FIG. 5 is a schematic view of an inlet purge tray of a particle generating apparatus according to an embodiment of the present invention;
FIG. 6 is a schematic view of a particle collection sheet and turbulence sheet assembly of a particle generating apparatus according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a pipeline valve system for connecting a particle generating apparatus to a main gas circuit according to an embodiment of the present invention.
In the figure: 11. a top cover; 12. a can-shaped housing; 13. a graphite gasket; 111. a pressure relief valve mounting interface; 112. a pressure gauge mounting interface; 113. a particle discharge port; 114. a feed inlet; 115. a charging port plug; 116. a feeding tube; 121. an upper flange mounting edge; 122. a gasket mounting groove; 123. a flow equalizing plate mounting seat; 124. a particle collection plate mount; 21. a magnetic stirring rod; 22. a magnetic base; 221. a knob; 31. an air inlet; 32. an air inlet joint; 33. an air inlet purge disc; 34. a flow equalizing plate; 331. a small hole; 341. round hole: 41. a cyclone air inlet; 42. a cyclone air inlet joint; 43. a hood; 44. a particle collection plate; 45. a turbulence plate; 46. a connecting plate is arranged on the turbulent flow plate; 451. and a turbulent flow plate round hole.
Detailed Description
Embodiments of the present application will be described in detail below with reference to the accompanying drawings.
Other advantages and effects of the present application will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present application with reference to specific examples. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. The application may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present application. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It is noted that various aspects of the embodiments are described below within the scope of the following claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the present disclosure, one skilled in the art will appreciate that one aspect described herein may be implemented independently of any other aspect, and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. In addition, such apparatus may be implemented and/or such methods practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
It should also be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present application by way of illustration, and only the components related to the present application are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.
In addition, in the following description, specific details are provided in order to provide a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects may be practiced without these specific details.
The applicant of the present application has found through research that the patent with publication number CN 111238766A provides a solid-state trace particle generator adopting a double-layer structure of an inner cylinder and an outer cylinder, a flat filter is adopted to divide the space of the inner cylinder into two parts, trace particles are placed on the filter, an air inlet is arranged on the side wall of the inner cylinder below the flat filter, and experiments show that the following problems exist in the arrangement: (1) The filtering grade (mesh size) of the flat filter is not good, if the mesh is too large, particles are easy to scatter below the flat filter through the filter, if the mesh is too small, the filter is easy to be blocked by the particles, the blowing pressure loss is increased due to the too fine mesh, and the requirement on the air source pressure is high; (2) The flat filter is generally made of cotton-flax polymer, cannot withstand high temperature and is not suitable for high-temperature high-pressure preheating combustion PIV flow field test, and if a ceramic sintering porous filter is used, the cost is increased; (3) In the air inlet purging mode, all purging air flows need to carry particles through the flat filter, most of the particles are lifted, and excessively concentrated tracer particle air flows are formed in the mixing chamber, so that on one hand, the consumption of the tracer particles is increased, and on the other hand, the concentration of the particles is not easy to control; (4) No stirring or vibration device is arranged, so that the problem of particle agglomeration exists; (5) Tangential through holes are arranged on the side wall of the mixing cavity, so that the mixture of particles and air has a certain tangential effect when passing through, and trace particles with larger particle sizes in the air flow are screened out under the action of centrifugal force and gravity. However, as the air flow has no axial momentum in the direction (upward) towards the outlet, the outlet is arranged in the middle of the cover plate, the radial distance from the tangential through hole is far, the size of the outlet is smaller, the problem of low particle output efficiency exists, and a considerable proportion of trace particles collide with the inner wall of the outer layer cylinder (accommodating cavity) under the action of centrifugal force so as to slide into the particle collecting cavity, so that the particle output efficiency is influenced; (6) All purge flow entering from the inlet passes through the tangential through holes, causing the problem that the tangential rotational momentum cannot be adjusted.
Therefore, the application provides the PIV solid-state trace particle generating device which can effectively solve the technical problems and is suitable for a high-temperature high-pressure preheating combustion test. Referring to fig. 1 and 2, the housing assembly includes a top cover 11 and a can-shaped housing 12 connected to each other, the top cover 11 is provided with a feed inlet 114 and a particle discharge outlet 113, the upper end of the can-shaped housing 12 is opened, the top cover 11 is hermetically connected, and the lower end of the can-shaped housing 12 is closed. The stirring system comprises a stirring part and a power part, wherein the stirring part is positioned at the bottom of the tank-shaped shell 12, and the power part is positioned below the tank-shaped shell 12. The air inlet purging system comprises an air inlet 31, an air inlet purging disc 33 and a flow equalizing plate 34, wherein an air inlet connector 32 is connected to the air inlet 31, the air inlet purging disc 33 and the flow equalizing plate 34 are located inside the tank-shaped shell 12, the air inlet 31 is located on the outer wall of the tank-shaped shell 12, the air inlet 31 and the air inlet purging disc 33 are located at the same height and between the flow equalizing plate 34 and the surface layer of the particle stack, and a plurality of small holes 331 are formed in the wall, facing the particle stack, of the air inlet purging disc 33. The cyclone separation system is located above the air intake purge system and comprises a cyclone air inlet 41, a particle collecting plate 44 and a turbulence assembly, wherein the particle collecting plate 44 is located above the flow equalizing plate 34, the cyclone air inlet 41 is located on the outer wall of the tank-shaped shell 12, the height of the cyclone air inlet 41 is higher than that of the particle collecting plate 44, the turbulence assembly is located above the particle collecting plate 44, and the turbulence assembly is used for forming a swirling air flow and increasing the turbulence of the air flow.
Specifically, the tank-shaped housing 12 is provided with an upper flange mounting edge 121 and a gasket mounting groove 122, and the tank-shaped housing 12 is hermetically connected with the top cover 11 through the upper flange mounting edge 121 and the graphite gasket 13.
Referring to fig. 3, the charging port 114 is located at the outer side of the top cover 11 and is sealed by the charging port plug 115, the charging port 114 is located at the inner side of the top cover 11 and is connected with the charging pipe 116, the other end of the charging pipe 116 passes through the flow equalizing plate 34, and the opening at the lower end is just below the flow equalizing plate 34.
In the above embodiment, the air inlet purging system is used for purging the trace particle stack to form a particle flow, the cyclone separation system is used for increasing turbulence, enhancing the mixing of the particle-air mixed airflow flowing upwards from the flow equalizing plate 34, forming a swirling airflow, generating a swirling motion, collecting the particles with larger particles, and discharging the particles with smaller particles from the particle discharge port 113, so that the particle size of the discharged trace particle flow is uniform, the airflow following performance is good, and the testing precision of the flow field test is effectively improved. By arranging the flow equalizing plate 34, the action of the flow equalizing plate 34 is realized in two aspects, namely, particle flow generated by an air inlet purging system is rectified on one hand, and slag-forming particles with larger particles are primarily screened out; on the other hand, the swirling airflow generated by the cyclone separation system is prevented from affecting the rising of the airflow in the space below the flow equalizing plate 34, thereby affecting the particle output efficiency. Through setting up mixing system, stir the particle heap body, can prevent effectively that the particle from caking to increase particle generating device's work efficiency.
Further, the top cover 11 is further provided with a pressure release valve mounting interface 111 and a pressure gauge mounting interface 112, the particle discharge outlet 113 is located at the center of the top cover 11, and the charging port 114, the pressure release valve mounting interface 111 and the pressure gauge mounting interface 112 are all arranged at the eccentric position of the top cover 11.
In a specific embodiment, referring to fig. 1 and 6, the turbulence assembly in the cyclone separation system includes a turbulence plate 45 and a turbulence plate upper connection plate 46 connected above the turbulence plate 45, the turbulence plate 45 is configured as a rectangular thin plate with uniformly arranged turbulence plate circular holes 451, the turbulence plate 45 is uniformly distributed on the particle collecting plate 44 along the circumferential direction, and the planes of the turbulence plates 45 all pass through the center of the particle collecting plate 44.
Further, the cyclone air inlets 41 may be provided in one or more, referring to fig. 4, the cyclone air inlets 41 are connected with cyclone air inlet joints 42, and are all provided on the side wall of the tank-shaped housing 12, and the cyclone air inlets 41 are tangential to the outer wall of the tank-shaped housing 12.
In order to increase the yield of the trace particles, the cyclone separation system is further provided with a funnel structure, i.e. a cone structure with two open ends, referring to fig. 1, the funnel structure 43 is provided with a funnel structure, wherein the small open end of the funnel structure is connected to the particle outlet 113, the large open end of the funnel structure faces downward, and in this embodiment, the height of the cyclone air inlet is located in the area between the particle collecting plate 44 and the opening at the lower end of the funnel 43.
In another embodiment, for better collection of particles screened by the cyclone system, the particle collection plate 44 is secured within the can-shaped housing 12 by a particle collection plate mount 124, the particle collection plate 44 being configured as a ring plate having a fluted configuration with a central opening of the particle collection plate 44 having a size greater than the size of the larger end of the hood opening.
When the cyclone separation system is in operation, air flows tangentially from the cyclone air inlet 41 into the interior of the tank-shaped housing 12 and then directly impinges on the turbulence plate 45, increasing turbulence, thereby enhancing mixing and creating a swirling air flow in the space above the particle collection plate 44; the particle-air mixed airflow flowing upwards from the flow equalizing plate 34 just meets the swirling airflow and is influenced by the swirling airflow to generate rotary motion, the particles with larger particles have large mass and large inertia, cannot do spiral ascending motion along with the cyclone, collide with the wall surface of the turbulent flow plate 45 under the inertia effect and then slide into the grooves of the particle collecting plate 44 to be collected; the smaller particles have a small inertia and can spiral upward along with the cyclone, and then enter the hood 43 and are discharged from the particle discharge port 113. The hood 43 mainly serves to enlarge the area of the particle outlet 113 and to improve the particle output efficiency.
In one embodiment, the stirring system is further defined so that the device can be adapted for use in a high temperature, high pressure preheat combustion test. The stirring part of the stirring system is provided with a magnetic stirring rod 21, and the magnetic stirring rod 21 is made of high temperature resistance and is placed inside the tank-shaped shell 12; the power part is set as a magnetic base 22, the magnetic base 22 is an electromagnetic generating device, needs to be powered on for use, is placed at the bottom of the tank-shaped shell 12, and can be used as a base of the particle generator. The magnetic base 22 is provided with a knob 221 for controlling the intensity of the magnetic field, and the magnetic stirring rod 21 rotates under the action of the magnetic field. Through setting up electromagnetic stirring system, can prevent effectively that the particle from caking to increase particle generator's work efficiency, greatly simplified jar body seal structure for motor stirring device, be applicable to high temperature high pressure and preheat combustion test.
In one embodiment, the air inlet purge disc 33 is a circular ring-shaped ring tube, referring to fig. 5, the air inlet 31 is connected with the air inlet 31, the air inlets 31 can be two and symmetrically arranged on the tank-shaped shell 12 and symmetrically connected with the air inlet purge disc 33, the small holes 331 are uniformly distributed on the circumference of the circular ring tube, the diameter range is 0.8mm-2mm, a certain included angle is formed between the axis of the small holes 331 and the axis of the tank-shaped shell 12, air passes through the small holes 331 and then blows trace particle piles at a certain inclination angle, and due to the higher momentum, particles on the surface layer of the piles are lifted and folded to flow, and the wrapped particles flow into the cyclone separation system through the flow equalizing plate 34.
Further, the flow equalizing plate 34 is fixed in the tank-shaped casing 12 through the flow equalizing plate mounting seat 123, and a plurality of round holes 341 with equal diameters are uniformly formed in the flow equalizing plate 34, refer to fig. 4. The particle flow generated by the air inlet purging system can be well rectified.
In a second aspect, an embodiment of the present application further provides a PIV solid trace particle generating system, which is used for a high-temperature and high-pressure preheating combustion test, and includes a PIV solid trace particle generating device according to any embodiment of the first aspect, referring to fig. 7, the system further includes a main air path and a pipeline valve assembly connected to the main air path, the valve assembly includes a check valve a, a ball valve and a three-way joint B C sequentially disposed on a side air path led out from the main air path, the three-way joint C is respectively connected to an air intake purge system and a cyclone separation system through two manifolds, one needle valve is respectively disposed on each of the two manifolds, and is respectively a needle valve D and a needle valve E, and a proportion of purge air of the air intake purge system and cyclone air of the cyclone separation system is controlled by adjusting openings of the two needle valves.
In a third aspect, an embodiment of the present application further provides a PIV solid state tracer particle generating method, using a PIV solid state tracer particle generating system as in the second aspect, the method including:
Step 1, controlling the airflow rate entering the PIV solid trace particle generating device from a main air channel by an adjusting ball valve B, and roughly adjusting the concentration of trace particles;
And 2, adjusting needle valves respectively connected with the air inlet sweeping system and the cyclone separation system, and finely adjusting the concentration of trace particles to ensure that the ratio of sweeping air to cyclone air is in the range of 3:1-1:3. If the purge gas amount is significantly larger than the cyclone gas amount (purge gas: cyclone gas > 3:1), the particle concentration becomes large and the particle diameter tends to be uneven; if the cyclone gas consumption is significantly greater than the purge gas consumption (purge gas: cyclone gas < 1:3), then the particle size becomes fairly uniform and the particle concentration becomes smaller; the particle concentration and the particle size uniformity can reach ideal effects by adjusting the proportion of the two to be in a certain range.
And 3, after the test is finished, closing the ball valve to cut off the air flow of the bypass air passage, and removing the whole solid particle generating device is not needed, so that the operation is convenient.
Stainless steel pipes are adopted for the main gas circuit, the bypass gas circuit and the two manifolds so as to meet the high-temperature high-pressure test requirement.
The PIV solid-state trace particle generation system of the application is based on the principle that: the bypass airflow is led out from the main air path and used as driving power of the particle generating device, the bypass airflow is respectively connected with the air inlet sweeping system and the cyclone separation system through a tee joint and a needle valve, and the air inlet sweeping disc in the air inlet sweeping system can generate a plurality of jet airflows which are uniformly distributed along the circumferential direction and are used for lifting particles; the tangential air inlet through hole and the turbulent flow plate of the cyclone separation system can generate a swirling air flow for screening out particles with large particle size and ensuring the uniformity of the particle flow. Particle flow concentration and particle size are controlled by adjusting the opening of the two needle valves, and then particle flow is introduced into the main gas path through a hood and a gas outlet at the upper part of the pressure vessel. The application does not need an extra high-pressure air source, does not change the air/fuel flow and the relative proportion thereof, and can avoid adding an extra flowmeter/flow controller. In addition, still set up electromagnetic stirring device, prevent the particle caking to increase particle generator's work efficiency, greatly simplified jar body seal structure for motor stirring device, be applicable to high temperature high pressure and preheat burning test.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present application should be included in the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.
Claims (10)
1. A PIV solid state trace particle generation apparatus, comprising:
The shell assembly comprises a top cover and a tank-shaped shell which are connected, wherein the top cover is provided with a feed inlet and a particle discharge outlet, and the lower end of the tank-shaped shell is closed;
the stirring system comprises a stirring part and a power part, wherein the stirring part is positioned at the bottom in the tank-shaped shell, and the power part is positioned below the tank-shaped shell;
The air inlet purging system comprises an air inlet, an air inlet purging disc and a flow equalizing plate, wherein the air inlet purging disc and the flow equalizing plate are positioned in the tank-shaped shell, the air inlet is positioned on the outer wall of the tank-shaped shell, the air inlet and the air inlet purging disc are positioned at the same height and between the flow equalizing plate and the surface layer of the particle stack, and a plurality of small holes are formed in the wall, facing the particle stack, of the air inlet purging disc;
The cyclone separation system is located above the air inlet purging system and comprises a cyclone air inlet, a particle collecting plate and a turbulent flow component, the particle collecting plate is located above the flow equalizing plate, the cyclone air inlet is located on the outer wall of the tank-shaped shell and tangent to the outer wall, the height of the cyclone air inlet is higher than that of the particle collecting plate, the turbulent flow component is located above the particle collecting plate, and the turbulent flow component is used for forming swirling air flow and increasing turbulence of the air flow.
2. The PIV solid state trace particle generating apparatus according to claim 1, wherein the turbulence assembly in the cyclone separation system comprises a turbulence plate and a turbulence plate upper connection plate connected above the turbulence plate, the turbulence plate is configured as a rectangular plate with evenly arranged round holes, a plurality of turbulence plates are uniformly distributed on the particle collecting plate along the circumferential direction, and the planes of the turbulence plates all pass through the center of the particle collecting plate.
3. The PIV solid state trace particle generator according to claim 2, wherein the cyclone separation system further comprises a funnel structure, the funnel structure having a small open end connected to the particle discharge outlet and a large open end facing downward; the height of the cyclone air inlet is positioned in the area between the particle collecting plate and the opening at the lower end of the hood.
4. A PIV solid state trace particle generator according to claim 3, wherein the particle collection sheet is provided as a ring sheet having a fluted configuration, the particle collection sheet having a central opening of a size greater than the size of the larger end of the hood opening.
5. The PIV solid-state trace particle generator according to claim 1, wherein the stirring part of the stirring system is a magnetic stirring rod, the power part is a magnetic seat, a knob for controlling the intensity of a magnetic field is arranged on the magnetic seat, and the magnetic stirring rod rotates under the action of the magnetic field.
6. The PIV solid state trace particle generator according to claim 1, wherein the inlet purge disc is provided as an annular collar, the apertures are evenly distributed on the circumference of the annular collar, and an angle is formed between the axis of the apertures and the axis of the tank-shaped housing.
7. The PIV solid state trace particle generating device according to claim 1, wherein a plurality of round holes with equal diameters are uniformly formed in the flow equalizing plate.
8. The PIV solid-state trace particle generating apparatus according to claim 1, wherein the top cover is further provided with a pressure release valve mounting interface and a pressure gauge mounting interface, the particle discharge port is located at a central position of the top cover, and the charging port, the pressure release valve mounting interface and the pressure gauge mounting interface are all disposed at eccentric positions of the top cover.
9. The PIV solid-state trace particle generating system is used for a high-temperature high-pressure preheating combustion test and is characterized by comprising a PIV solid-state trace particle generating device as claimed in any one of claims 1-8, and further comprising a main gas path and a pipeline valve assembly connected with the main gas path, wherein the valve assembly comprises a one-way valve, a ball valve and a three-way joint which are sequentially arranged on a bypass gas path led out from the main gas path, the three-way joint is respectively connected with an air inlet blowing system and a cyclone separation system through two manifolds, a needle valve is respectively arranged on each of the two manifolds, and the proportion of blowing gas of the air inlet blowing system and cyclone gas of the cyclone separation system is controlled by adjusting the opening of the two needle valves.
10. A PIV solid state trace particle generation method, employing a PIV solid state trace particle generation system according to claim 9, the method comprising:
Adjusting the ball valve to control the air flow entering the PIV solid trace particle generating device from the main air path, and roughly adjusting the concentration of trace particles;
Regulating needle valves respectively connected with the air inlet purging system and the cyclone separation system, and finely regulating the concentration of trace particles to ensure that the ratio of purge gas to cyclone gas is in the range of 3:1-1:3;
And after the test is finished, closing the ball valve to cut off the air flow of the bypass air passage.
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| CN208984664U (en) * | 2018-09-26 | 2019-06-14 | 中国科学院工程热物理研究所 | A kind of PIV solid-state trace displaying particle generator |
| CN113984118A (en) * | 2021-10-22 | 2022-01-28 | 中国矿业大学 | Human body exhalation droplet aerosol monitoring and simulation system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH06148216A (en) * | 1992-11-10 | 1994-05-27 | Ricoh Co Ltd | Visualizing particle generator |
| JP4291460B2 (en) * | 1999-07-01 | 2009-07-08 | 東邦瓦斯株式会社 | Tracer particle feeder |
| CN213091699U (en) * | 2020-08-24 | 2021-04-30 | 应急管理部天津消防研究所 | Tracer particle powder spraying device applied to flame flow field measurement |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208984664U (en) * | 2018-09-26 | 2019-06-14 | 中国科学院工程热物理研究所 | A kind of PIV solid-state trace displaying particle generator |
| CN113984118A (en) * | 2021-10-22 | 2022-01-28 | 中国矿业大学 | Human body exhalation droplet aerosol monitoring and simulation system |
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