CN208984664U - A kind of PIV solid-state trace displaying particle generator - Google Patents
A kind of PIV solid-state trace displaying particle generator Download PDFInfo
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- CN208984664U CN208984664U CN201821578907.6U CN201821578907U CN208984664U CN 208984664 U CN208984664 U CN 208984664U CN 201821578907 U CN201821578907 U CN 201821578907U CN 208984664 U CN208984664 U CN 208984664U
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Abstract
The utility model discloses a kind of PIV solid-state trace displaying particle generators, include: the tank body of storage solid-state trace particle, the plate lid being fixedly connected with the tank body and the low-speed rotation mechanism to stir solid-state trace particle；The plate, which covers, is respectively arranged with air inlet, annular inlet chamber and gas outlet；The air inlet is connect by air inlet pipe with high-pressure air source；Annular inlet chamber bottom side wall surface is provided with through-hole；The gas outlet is connect with particle delivery line.The PIV solid-state trace displaying particle generator of the utility model can realize the quick adjusting of micron order trace particle quickly sowed with particle concentration within the scope of wider bleed pressure；And particle kind applicability is wide, can meet the measurement needs of cold conditions air flow field and Combustion Flow Field.Agitating device effectively inhibits particle buildup to agglomerate, and increases particle yield, improves particle utilization rate.
Description
Technical field
The utility model relates to Particle-beam Tracing laser measuring technique fields, and in particular to one kind is applied to gaseous mobile field and measures
The solid-state trace displaying particle generator of uniform and stable particle flux can be provided for particle image velocimeter system (PIV).
Background technique
Particle image velocimeter (Particle Image Velocimetry, PIV) is a kind of non-contacting velocity field survey
Amount technology, relative to the invasive measurement means such as hot-wire anemometer, PIV had both had single point measuring technique high-precision and high-resolution
The advantages of, and transient images and overall structure that Plane Fluid Field is shown can be obtained.In two-dimentional whole-field velocity measurement field, PIV is
A kind of technology of maturation, and rapidly develop the standard method for becoming flow field survey.
The basic principle of PIV technology is: sowing the trace particle of debita spissitudo in flow field, uses the double arteries and veins of Nd:YAG two-chamber
Rush laser light sheet and illuminate institute's flow measurement field areas, by twice in succession or multiple exposure (time interval of two bundle of pulsed laser can
Adjust), the image of particle is recorded in CCD camera, and image post processing software is using cross-correlation method to two frames in each pair of photo
Particle picture carries out computing cross-correlation, obtains the velocity vector of each point in flow field.It can be seen that the generation of trace particle with sow
It is to obtain the premise and important factor in order of ideal flow field result.The selection of trace particle and the use of particle generator should meet
It is claimed below:
The problem of trace particle selects.Trace particle requirement is nontoxic, corrosion-free, chemical property is stable, cleaning, most important
It is to require the followability of particle and fluid motion good.Keep the flowing followability of particle good, it is necessary to the diameter of particle is smaller, but
This can be such that the astigmatism of particle reduces, and be not easy to be imaged.Therefore each factor need to be comprehensively considered when choosing particle.In short, grain
The principle that son is chosen are as follows: the ratio of particle is important as far as possible close to the specific gravity of fluid media (medium), and the diameter of particle will guarantee scattered light intensity
Under conditions of small as far as possible, generally micron dimension.In addition, high an order of magnitude of influence of the influence specific density of partial size.?
The trace particle scale requirement sowed in water flow field is 10~50 μm, and the trace particle scale requirement used in air flow field is
1~10 μm.
The problem of particle generator uses.Particle generator requires have the energy for quickly adjusting particle concentration in measured zone
Power, and particle concentration substantially constant is maintained within a certain period of time.When particle concentration is very big, particle image can overlap,
Since laser is interference light, so will form laser speckle on egative film rather than independent particle image.Although using laser speckle
The displacement of speckle field can be equally measured, but for the particle of movement, the stability of speckle field is poor, extracts speckle field
Displacement is relatively difficult.When particle concentration is too low, the movement of particle cannot will sufficiently, comprehensively reflect the true knot in flow field
Structure, PIV can not carry out the computing cross-correlation of high confidence level.Therefore trace particle must all be thought better of from choosing to sow.
Well known solid-state trace displaying particle generator, such as the composition packet of the Particle Blaster 110 of Lavision company
Include: particle storage tank, the annular inlet chamber of position can be adjusted in tank body, can be produced the Ban Gai for being provided with air inlet and air outlet
The pedestal and magnetic stirring bar of raw electromagnetic field.This particle generator is very expensive；Secondly, magnetic stirring bar is the cylinder of rule
Shape, the less effective in terms of stirring particle and broken agglomeration；This particle generator is not provided with feed opening again, supplements particle
When need stripper lid, it is cumbersome；In addition, working pressure range is relatively narrow, maximum is no more than 0.5MPa；Finally, this generator
Particle capacity it is small, particle yield is few.
Utility model content
The main purpose of the utility model is to provide a kind of solid-state trace particle generations in gaseous mobile field measurement
Device, solid particles type applicability is wide, can meet the measurement needs of cold conditions air flow field and Combustion Flow Field；And in wider gas
In the pressure limit of source (0.2MPa~1.6MPa), it is quick with particle concentration to can be realized quickly sowing for micron order trace particle
It adjusts.Easy to use, without inflation in advance, connecting gas source can produce uniform and stable particle flux.
In order to achieve the above objectives, technical scheme of the utility model is as follows:
A kind of PIV solid-state trace displaying particle generator, tank body including a storage solid-state trace particle one are fixedly connected on institute
The Ban Gai and one for stating top of the tank is arranged in the tank body to the low-speed rotation mechanism for stirring solid-state trace particle, feature
It is,
The plate, which covers, is provided with air inlet, annular inlet chamber and gas outlet,
Described air inlet one end is connected to the annular inlet chamber, and the other end is arranged with one in the tank by an air inlet pipe
High-pressure air source connection outside body,
Described gas outlet one end is connected to the tank body, and the other end is by a particle delivery line and is arranged outside the tank body
The flow field survey regional connectivity in portion,
Several are provided on the bottom side wall surface of the annular inlet chamber to be uniformly distributed circumferentially and be connected to the tank body
Through-hole forms circumferentially uniform high-speed jet gas flow purging by the high pressure gas that the through-hole enters the tank body and is stored in institute
State the solid-state trace particle in tank body.
Preferably, the tank body is a cylindrical tank, and the low-speed rotation mechanism is a setting in the cylindrical tank
The composite structure of intracorporal stirring shovel, raker stirrer or stirring shovel and raker stirrer.
Preferably, the electromechanics that the low-speed rotation mechanism is arranged in outside the tank body with one are connect.
Preferably, the motor is placed in the bottom of the tank body, machine shaft extend upwardly into the tank body with it is described
Low-speed rotation mechanism mechanical connection, is equipped with sealing structure between the machine shaft and tank body.
Preferably, the air inlet pipe is equipped with the valve of control charge flow rate, and the particle delivery line is equipped with can be quickly
Cut off the valve of particle supply.
Preferably, the through-hole of annular inlet chamber bottom side wall surface is inclined hole.
Preferably, the plate lid is fixedly connected on the top of the tank body by flange seal, and the air inlet setting exists
The center of plate lid is arranged in the marginal position of plate lid, the gas outlet.
Preferably, the plate, which covers, is provided with feed opening, air gauge and relief valve, equipped with plug on the feed opening,
The annular region between the air inlet and the gas outlet is arranged in the feed opening, air gauge and relief valve.
Preferably, the high-pressure air source is air compressor gas source.
Preferably, the solid-state trace particle being stored in the tank body, amount of storage are no more than the one of the tank volume
Half.
The PIV solid-state trace displaying particle generator of the utility model, working principle and process are as follows:
The PIV solid-state trace displaying particle generator of the utility model will store the low speed of the tank body and stirring particle of solid particles
Rotating mechanism combines, and at work, the solid-state trace particle of suitable species is contained in tank body first, amount of storage is described
The half of tank volume；Then, the pressure-air from high-pressure air sources such as air compressors is sprayed by the through-hole of annular inlet chamber
It shoots out, forms circumferentially uniform high-speed jet gas flow purging solid-state trace particle；At the same time, solid-state trace particle accumulation body
Irregular movement is done under the action of low-speed rotation mechanism, increases the contact surface area of purge stream Yu solid-state trace particle,
Purge stream carries a large amount of solid-state trace particles immediately and enters particle delivery line by gas outlet, exports to corresponding flow field survey
Gaseous state velocity field measurement is realized in region.
Compared with the existing technology, the PIV solid-state trace displaying particle generator of the utility model, it is fixed between tank body and plate lid
Connection increases tank body voltage endurance capability, can be realized micron within the scope of than wider bleed pressure (0.2MPa~1.6MPa)
The quick adjusting of grade trace particle quickly sowed with particle concentration；Particle kind applicability is wide, can meet cold conditions air flow field
Measurement with Combustion Flow Field needs；It is easy to operate, without inflation in advance, connect gas source, that is, uniform and stable particle of sustainable generation
Stream；Low-speed rotation mechanism can effectively inhibit the aggregation agglomeration of solid-state trace particle, increase particle yield, improve particle utilization rate,
Plate covers setting feed opening, facilitates supplement solid-state trace particle, but must can just be added under the premise of cutoff high gas source
Material operation.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the PIV solid-state particle generator of the utility model.
Specific embodiment
For the purpose of this utility model, technical solution and advantage is more clearly understood, develop simultaneously implementation referring to the drawings
The utility model is further described in example.
As shown in Figure 1, the PIV solid-state particle generator of the utility model, the cylinder including storing solid-state trace particle
Tank body 1, the plate lid 2 being fixedly connected by flange with top of the tank and the low-speed rotation mechanism for stirring solid-state trace particle；Plate lid 2
On be provided with air inlet 4, annular inlet chamber 5 and gas outlet 6；Air inlet 4 passes through air inlet pipe 7 and valve 8 and air compressor gas
Source 9 connects；Several through-holes 10 are arranged in the bottom side wall surface of annular inlet chamber 5, and through-hole 10 is preferably inclined hole, and the aperture of inclined hole is
2mm, number are 6, are circumferentially evenly arranged；Gas outlet 6 is connect with particle delivery line 11, and particle delivery line 11 and setting are in tank
Flow field survey region 3 outside body 1 is connected to.Low-speed rotation mechanism includes stirring shovel or raker stirrer 12 and their low speed is driven to hand over
Galvanic electricity machine 13, revolving speed 20r/min.Motor 13 is placed in the bottom of cylindrical tank 1, leads between the shaft and tank body 1 of motor 13
O-ring A sealing is crossed, and guarantees good sealing effect using the compression O-ring A of piece 14 is compressed.
It is connected between air inlet 4, air inlet pipe 7, valve 8 and air compressor machine gas source 9 by ferrule fitting B.It is preferably real
Existing the technical solution of the utility model, valve 8 are ball valve, measure needs according to experiment, can quickly and easily adjust into particle
The air mass flow of generator, and then control the particle concentration in flow field survey region.
For the technical solution of the utility model is better achieved, in embodiment, gas outlet 6 passes through with particle delivery line 11
Ferrule fitting B connection.The valve 15 that can quickly cut off particle supply is provided on particle delivery line 11, which is solenoid valve.
In the present embodiment, the marginal position of plate lid 2 is arranged in air inlet 4, and the center of plate lid 2 is arranged in gas outlet 6.
Feed opening 16, relief valve 17 and air gauge 18 are additionally provided on plate lid 2, their position be located at air inlet 4 and gas outlet 6 it
Between annular region.The setting of feed opening 16 can satisfy under conditions of not stripper lid 2, conveniently and efficiently send out to particle
The needs of raw device supplement particle material.In particle generator work, feed opening is sealed using a plug with pipe screw thread
Sternly.Gas pressure intensity in particle generator can be limited within 1.6MPa by relief valve 17 and air gauge 18, to ensure using peace
Entirely.
Now in conjunction with Fig. 1 and has design PIV solid-state particle generator each component of the utility model is discussed in detail
Structure and size and working principle.The main body of particle generator is tank body 1, and size can measure needs according to experiment, such as test
Part size, measurement duration and particle flux concentration etc. are chosen because usually appropriate.According to existing design experiences, when testpieces air
Flow is 10~100 cubes ms/hour, and into the about accounting 30% of the air mass flow in particle generator, 1 outer diameter of cylindrical tank is
160mm, wall thickness 5mm are highly 120mm.The diameter of circular slab lid 2 is 200mm, passes through flange and M6 standard bolt and tank body
1 connection.It is provided with groove in the ring flange of tank body 1, O-shaped rubber seal A is arranged in groove, is machined on plate lid 2 and matches with groove
The annular shape convex stupefied 19 to compress O-ring closed.
Gas handling system is successively by air compressor machine gas source 9, ball valve 8, air inlet pipe 7, air inlet 4, annular inlet chamber 5 and 10 groups of inclined hole
At.By ferrule fitting or Green's head B connection between them, air inlet pipe 7 is the stainless steel tube of outer diameter 10mm, and such setting can
To guarantee the voltage endurance capability of gas handling system.When practical operation, charge flow rate is controlled by the aperture of regulation ball valve 8, and then adjust
Save the particle concentration in measured zone.Exhaust system is successively made of gas outlet 6, particle delivery line 11 and solenoid valve 15.They
Between by ferrule fitting or Green head B connection, delivery line 11 for outer diameter 10mm stainless steel tube.
The low-speed rotation mechanism of build-up of particles body is stirred by stirring shovel or raker stirrer 12 and the low speed AC electricity for driving them
Machine 13 forms.The revolving speed of slowspeed machine is 20r/min.Motor 13 is fixed by screws in the bottom of tank body 1, the shaft of motor 13
It is sealed between tank body 1 by O-ring A, and guarantees good sealing effect using the compression O-ring A of piece 14 is compressed.Compress piece
14 are connect by screw with tank body 1.From the point of view of the vertical view view directions of particle generator, the direction of rotation of low-speed rotation mechanism is
Counterclockwise.
The working principle and the course of work of the PIV solid-state particle generator of the utility model are: the height from high-pressure air source
It presses air to enter annular inlet chamber by air inlet pipe, ball valve and air inlet, the volume flow of high pressure gas is controlled by ball valve.
The solid-state trace particle of about 1/2 capacity is packed into cylindrical tank, pressure-air passes through the inclined hole of annular inlet chamber bottom side wall surface
It ejects, forms the particle that circumferentially uniform high-speed jet gas flow purging does irregular movement under rotating mechanism effect；With
That is, a large amount of particles are carried out by air-flow into particle delivery line, flow field survey region is entered back into, uniform and stable tracer is formed
Particle flux.For the course of work specifically, the trace particle of suitable species is contained in particle storage tank first, amount of storage is tank body appearance
Long-pending half, then, the pressure-air from air compressor enter annular air inlet by air inlet pipe 7, ball valve 8 and air inlet 4
Chamber 5 controls the volume flow of high pressure gas by ball valve 8.Then, high pressure gas passes through 5 bottom side wall surface of annular inlet chamber
Inclined hole 10 ejects, and forms circumferentially uniform high-speed jet gas flow purging particle；At the same time, build-up of particles body is shoveled in stirring
Or irregular movement is done under the action of raker stirrer 12, the contact surface area of purge stream and particle is increased, purge stream is immediately
It carries a large amount of particles and particle delivery line 11 is entered by gas outlet 6, export to corresponding flow field survey region 3, realize gaseous state speed
Spend field measurement.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Within the spirit and principle of utility model, any modification, equivalent substitution, improvement and etc. done should be included in the utility model
Within the scope of.
Claims (10)
1. a kind of PIV solid-state trace displaying particle generator, tank body including a storage solid-state trace particle, one be fixedly connected on it is described
The Ban Gai of top of the tank and one is arranged in the low-speed rotation mechanism for stirring solid-state trace particle in the tank body, and feature exists
In,
The plate, which covers, is provided with air inlet, annular inlet chamber and gas outlet；
Described air inlet one end is connected to the annular inlet chamber, and the other end is arranged outside the tank body by an air inlet pipe with one
The high-pressure air source in portion is connected to,
Described gas outlet one end is connected to the tank body, and the other end is by a particle delivery line and is arranged in outside the tank body
Flow field survey regional connectivity,
Several through-holes for being uniformly distributed circumferentially and being connected to the tank body are provided on the bottom side wall surface of the annular inlet chamber,
Circumferentially uniform high-speed jet gas flow purging, which is formed, by the high pressure gas that the through-hole enters the tank body is stored in the tank
Solid-state trace particle in body.
2. PIV solid-state trace displaying particle generator according to claim 1, which is characterized in that the tank body is one cylindrical
Tank body, the low-speed rotation mechanism are stirring shovel, raker stirrer or the stirring shovel being arranged in the cylindrical tank body and stirring
The composite structure of rake.
3. PIV solid-state trace displaying particle generator according to claim 1, which is characterized in that the low-speed rotation mechanism with
One is arranged in the electromechanics connection outside the tank body.
4. PIV solid-state trace displaying particle generator according to claim 3, which is characterized in that the motor is placed in the tank
The bottom of body, machine shaft are extended upwardly into the tank body and are mechanically connected with the low-speed rotation mechanism, the machine shaft
Sealing structure is equipped between tank body.
5. PIV solid-state trace displaying particle generator according to claim 1, which is characterized in that the air inlet pipe is equipped with control
The valve of charge flow rate processed, the particle delivery line are equipped with the valve that can quickly cut off particle supply.
6. PIV solid-state trace displaying particle generator according to claim 1, which is characterized in that the annular inlet chamber bottom side
The through-hole of wall surface is inclined hole.
7. PIV solid-state trace displaying particle generator according to claim 1, which is characterized in that the plate lid is close by flange
Envelope is fixedly connected on the top of the tank body, and the marginal position of plate lid is arranged in the air inlet, and the gas outlet is arranged in plate
The center of lid.
8. PIV solid-state trace displaying particle generator according to claim 1, which is characterized in that the plate, which covers, to be additionally provided with
Feed opening, air gauge and relief valve, equipped with plug on the feed opening, the feed opening, air gauge and relief valve setting exist
Annular region between the air inlet and the gas outlet.
9. PIV solid-state trace displaying particle generator according to claim 1, which is characterized in that the high-pressure air source is air
Compressor gas source.
10. PIV solid-state trace displaying particle generator according to claim 1, which is characterized in that be stored in the tank body
Solid-state trace particle, amount of storage are no more than the half of the tank volume.
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| CN201821578907.6U CN208984664U (en) | 2018-09-26 | 2018-09-26 | A kind of PIV solid-state trace displaying particle generator |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112229597A (en) * | 2020-09-30 | 2021-01-15 | 中国空气动力研究与发展中心高速空气动力研究所 | Tracer particle generator for large-scale high-speed wind tunnel PIV test |
| CN112834166A (en) * | 2021-01-06 | 2021-05-25 | 长沙理工大学 | Tracer particle releasing device suitable for liquid flow field |
| CN113281533A (en) * | 2021-05-19 | 2021-08-20 | 上海交通大学 | Solid-state tracer particle scattering device based on hourglass filling and multi-stage filtering |
| CN113600073A (en) * | 2021-08-02 | 2021-11-05 | 中国科学院工程热物理研究所 | Solid state tracing particle generator |
| CN113985059A (en) * | 2021-10-26 | 2022-01-28 | 南方科技大学 | Automatic stirring formula spike particle generator |
| CN114487474A (en) * | 2021-12-27 | 2022-05-13 | 北京理工大学 | Device for controlling supply of tracer particles |
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2018
- 2018-09-26 CN CN201821578907.6U patent/CN208984664U/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112229597A (en) * | 2020-09-30 | 2021-01-15 | 中国空气动力研究与发展中心高速空气动力研究所 | Tracer particle generator for large-scale high-speed wind tunnel PIV test |
| CN112229597B (en) * | 2020-09-30 | 2022-07-19 | 中国空气动力研究与发展中心高速空气动力研究所 | Tracer particle generator for large-scale high-speed wind tunnel PIV test |
| CN112834166A (en) * | 2021-01-06 | 2021-05-25 | 长沙理工大学 | Tracer particle releasing device suitable for liquid flow field |
| CN113281533A (en) * | 2021-05-19 | 2021-08-20 | 上海交通大学 | Solid-state tracer particle scattering device based on hourglass filling and multi-stage filtering |
| CN113281533B (en) * | 2021-05-19 | 2022-11-01 | 上海交通大学 | Solid-state tracer particle scattering device based on hourglass filling and multi-stage filtering |
| CN113600073A (en) * | 2021-08-02 | 2021-11-05 | 中国科学院工程热物理研究所 | Solid state tracing particle generator |
| CN113985059A (en) * | 2021-10-26 | 2022-01-28 | 南方科技大学 | Automatic stirring formula spike particle generator |
| CN114487474A (en) * | 2021-12-27 | 2022-05-13 | 北京理工大学 | Device for controlling supply of tracer particles |
| CN114487474B (en) * | 2021-12-27 | 2023-02-03 | 北京理工大学 | Device for controlling supply of tracer particles |
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