CN106885686B - A kind of drop high speed hits the experimental rig of wall - Google Patents
A kind of drop high speed hits the experimental rig of wall Download PDFInfo
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- CN106885686B CN106885686B CN201710163583.3A CN201710163583A CN106885686B CN 106885686 B CN106885686 B CN 106885686B CN 201710163583 A CN201710163583 A CN 201710163583A CN 106885686 B CN106885686 B CN 106885686B
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- drop
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- wind tunnel
- high speed
- pipeline section
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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
Abstract
The invention belongs to experimental rig fields, and disclose the experimental rig that a kind of drop high speed hits wall, including computer, relay module, high speed camera, electromagnet, syringe needle, construction of wind tunnel, drainage blower, bellows, support pipeline section, support frame, fluid dividing cover, spotlight and astigmatism plate, the electromagnet includes solenoid box body, iron core and return spring, and the syringe needle is fixedly mounted on the lower end of the iron core；The lower end of the construction of wind tunnel is protruded into the upper end of the support pipeline section；The fluid dividing cover is placed on support frame as described above；The test board is set in the fluid dividing cover；The spotlight and the astigmatism plate are set to by the construction of wind tunnel；The high speed camera is horizontally placed on by the construction of wind tunnel.What the present invention can effectively improve drop in test hits wall speed, small in size, compact-sized.In addition, separating drop from air-flow by installing fluid dividing cover additional in construction of wind tunnel, the interference problem that air-flow hits wall to drop can solve.
Description
Technical field
The invention belongs to experimental rig fields, and the experimental rig of wall is hit more particularly, to a kind of drop high speed.
Background technique
It is relatively common in production and living that drop hits the phenomenon that solid wall surface, such as soil erosion, inkjet printing, spraying cold
But, engine fuel injection hits wall etc..Therefore, the research for hitting dry (wet) solid wall surface phenomenon for drop has extremely important
Meaning.In the past studies have shown that after drop shock solid wall surface, according to the difference of impact kinetic energy, drop paving can be showed respectively
Exhibition or two kinds of collision forms of fluid spills.Hit the experimental study of dry (wet) solid wall surface for drop, scholars mostly with
High speed camera captures that drop hits sprawling after wall or splashing process is as point of penetration, and combines image processing techniques, obtains difference
Under the conditions of drop hit detailed development process and the changing rule of wall.
Currently, the observation experiment rack principle that common drop hits wall phenomenon is all fairly simple." Song Yun is superfine, liquid for document
Drop hits the splashing campaign internal combustion engine journal of wall surface, 2013 (06): the 531-536 pages " discloses a kind of for observed drop
The experimental rig of wall is hit, author is verified using the reliability that the experimental rig hits wall mathematical calculation model to drop, and
Have studied the critical condition that drop hits wall splashing.But in the experimental rig of the paper, drop hits wall speed by gravity acquisition,
Wall speed can only be hit to change by adjusting drop height of drop.So, in order to obtain higher wall speed of hitting it is necessary to not
It is disconnected to improve droplet generator height, cause the bulky problem of test-bed.Further, since existing in drop dropping process
Air drag, so drop hits the raising of wall speed, there is also bottlenecks.
In order to overcome the problems, such as this, obtains higher drop and hit wall speed, document " Pan, K., K.Tseng and
C.Wang,Breakup of a droplet at high velocity impacting a solid
2010.48 (1): p.143-156. " surface.Experiments in Fluids discloses the examination that another drop hits wall
Experiment device, text in author accelerated by dropping process of the air-flow to drop, the wall speed of hitting of drop can be made to obtain substantially
It improves.But in the apparatus, drop is not kept completely separate before hitting solid wall surface from high-speed flow, not can avoid air-flow
The influence of splashing form after head-on collision wall.Therefore, hitting wall splashing form by the drop that the device takes can not reflect really now
As.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides the test dresses that a kind of drop high speed hits wall
It sets, drop high-speed impact solid wall surface can be obtained, and can facilitate and adjust the generating device that drop hits wall angle.It is intended to
Design one can accelerate drop, and adjusting can be facilitated to hit wall speed, hit wall angle and liquid-drop diameter, avoid accelerating
Air-flow hits wall splashing process to drop and generates interference.
To achieve the above object, it is proposed, according to the invention, provide the experimental rig that a kind of drop high speed hits wall, feature exists
In, including computer, relay module, high speed camera, electromagnet, syringe needle, construction of wind tunnel, drainage blower, bellows, support tube
Section, support frame, fluid dividing cover, spotlight and astigmatism plate, wherein
The computer is separately connected the relay module and the high speed camera, the relay module and the electricity
Magnet connection；
The electromagnet includes solenoid box body, iron core and return spring, the intracorporal coil of solenoid box with it is described
Relay module connection, the iron core are vertically arranged and protrude into the solenoid box body, and the return spring is installed on institute
It states on iron core, and one end of the return spring is mounted on the solenoid box body, the other end is mounted on the iron core,
For driving the iron core return；
The syringe needle is fixedly mounted on the lower end of the iron core, for hanging drop；
The construction of wind tunnel is located at the underface of the syringe needle, is vertically installed on fixed bracket, and the upper end is made
For wind-tunnel entrance, lower end is exported as wind-tunnel；
The air intake vent of the drainage blower is correspondingly arranged in the exit of the construction of wind tunnel, out of described construction of wind tunnel
It extracts air and is formed in the construction of wind tunnel and stablize downward air-flow, for accelerating to fall into the liquid inside construction of wind tunnel
The falling speed of drop；
The bellows is installed at the air intake vent of the drainage blower and it accepts the support pipeline section；
The lower end of the construction of wind tunnel is protruded into the upper end of the support pipeline section, and it accepts support frame as described above；
The fluid dividing cover is placed on support frame as described above, and the upper end has aperture, using as droplet inlet, lower end seal
It closes, there are gap between the outer wall of the fluid dividing cover and the inner wall of the construction of wind tunnel, using as airflow channel；
The test board is set in the fluid dividing cover, for being collided with drop；
The spotlight and the astigmatism plate are set to by the construction of wind tunnel, and the astigmatism plate is located at the optically focused
Between lamp and the construction of wind tunnel, for illuminating the region splashed behind the test board and drop impact test wooden partition face；
The high speed camera is horizontally placed on by the construction of wind tunnel, after for shooting drop impact test wooden partition face
Splashing situation.
Preferably, the construction of wind tunnel plastics accelerate pipeline section and quartz to shunt pipeline section, for integrating air-flow and accelerating liquid
Drop, the upper end that the plastics accelerate the lower end of pipeline section and the quartz to shunt pipeline section are fixed together, the support pipeline section
Upper end protrude into it is described quartz shunt pipeline section lower end.
Preferably, the drainage blower is connected with frequency converter, and the frequency converter connects AC power source, by adjusting the change
Frequency device, can be changed the frequency of supply of the drainage blower, to change the revolving speed of the blade of the drainage blower, to change institute
The gas flow rate in construction of wind tunnel is stated, and then adjusts its acceleration effect to drop.
Preferably, the relay module connects DC power supply.
Preferably, the fluid dividing cover is quartz glass cup open up and down, and lower end is resisted against on support frame as described above
And it is closed by support frame as described above.
Preferably, the test board is mounted on support frame as described above by articulated structure, and the articulated structure includes upper wedge
Shape corner block is with lower wedge-shaped corner block and the upper wedge-shaped corner block is connected with lower wedge-shaped corner block by link bolt, described
Test board is mounted on the upper wedge-shaped corner block, adjustable by changing the angle of upper wedge-shaped corner block and lower wedge-shaped corner block
The tilt angle of the whole test board, so as to adjust the angle of drop impact test plate.
Preferably, the astigmatism plate is made of ground glass.
Preferably, support frame as described above includes plectane main body and the multiple hanging rods for being arranged circumferentially in the plectane body side,
The plectane main body is equipped with step, and the fluid dividing cover is placed on the step of the plectane main body.
Preferably, all hanging rods are accepted on the top of the support pipeline section.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, can obtain down and show
Beneficial effect:
The present invention can effectively improve drop in test and hit wall speed, so that drop hits wall splashing experimental rig volume
It is small, it is compact-sized.In addition, drop is separated from air-flow, can solve gas by installing fluid dividing cover in construction of wind tunnel
Stream hits the interference problem of wall to drop.
Detailed description of the invention
Fig. 1 is structure schematic diagram of the invention.
Fig. 2 is the schematic diagram that fluid dividing cover is mounted in construction of wind tunnel；
Fig. 3 is the top view of support frame as described above；
Fig. 4 is the schematic diagram of articulated structure.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
Referring to Fig.1~Fig. 4, a kind of drop high speed hit the experimental rig of wall, including computer 5, relay module 3, high speed
Camera 9, electromagnet 1, syringe needle 2, construction of wind tunnel 6, drainage blower 11, bellows 10, support pipeline section 18, support frame 19, fluid dividing cover
7, spotlight 14 and astigmatism plate 15, wherein
The computer 5 is separately connected the relay module 3 and the high speed camera 9, the relay module 3 and institute
State the connection of electromagnet 1；
The electromagnet 1 include solenoid box body, iron core and return spring, the intracorporal coil of solenoid box with it is described
Relay module 3 connects, and the iron core is vertically arranged and protrudes into the solenoid box body, and the return spring is installed on institute
It states on iron core, and one end of the return spring is mounted on the solenoid box body, the other end is mounted on the iron core,
For driving the iron core return；
The syringe needle 2 is fixedly mounted on the lower end of the iron core, for hanging drop；
The construction of wind tunnel 6 is located at the underface of the syringe needle 2, is vertically installed on fixed bracket, and the upper end
As wind-tunnel entrance, lower end is exported as wind-tunnel；
The air intake vent of the drainage blower 11 is correspondingly arranged in the exit of the construction of wind tunnel 6, with from the wind-tunnel knot
Air is extracted in structure 6 and is formed in the construction of wind tunnel 6 and stablizes downward air-flow, for accelerating to fall into construction of wind tunnel 6
The falling speed of internal drop；
The bellows 10 is installed at the air intake vent of the drainage blower 11 and it accepts the support pipeline section 18；
The lower end of the construction of wind tunnel 6 is protruded into the upper end of the support pipeline section 18, and it accepts support frame as described above 19；
The fluid dividing cover 7 is placed on support frame as described above 19, and the upper end has aperture, using as droplet inlet, lower end
Closing, there are gap between the outer wall of the fluid dividing cover 7 and the inner wall of the construction of wind tunnel 6, using as airflow channel；
The test board 8 is set in the fluid dividing cover 7, for being collided with drop；
The spotlight 14 and the astigmatism plate 15 are set to by the construction of wind tunnel 6, and the astigmatism plate 15 is located at
Between the spotlight 14 and the construction of wind tunnel 6, for after illuminating 8 wall surface of the test board 8 and drop impact test plate
The region of splashing；
The high speed camera 9 is horizontally placed on by the construction of wind tunnel 6, for shooting 8 wall surface of drop impact test plate
Splashing situation afterwards.
Further, 6 plastics of construction of wind tunnel accelerate pipeline section 16 to shunt pipeline section 17 with quartz, for integrating air-flow and adding
Fast drop, the upper end that the plastics accelerate the lower end of pipeline section 16 and the quartz to shunt pipeline section 17 is fixed together, described
The lower end that the quartz shunts pipeline section 17 is protruded into the upper end of support pipeline section 18.
Further, the drainage blower 11 is connected with frequency converter 12, and the frequency converter 12 connects AC power source 13, passes through tune
The frequency converter 12 is saved, the frequency of supply of the drainage blower 11 can be changed, thus change the blade of the drainage blower 11
Revolving speed to change the gas flow rate in the construction of wind tunnel 6, and then adjusts its acceleration effect to drop.
Further, the relay module 3 connects DC power supply 4.
Further, the fluid dividing cover 7 is quartz glass cup open up and down, and lower end is resisted against support frame as described above 19
Above and by support frame as described above 19 close.
Further, the test board 8 is mounted on support frame as described above 19 by articulated structure 20, and the articulated structure 20 wraps
It includes wedge-shaped corner block and lower wedge-shaped corner block and the upper wedge-shaped corner block and lower wedge-shaped corner block passes through link bolt 21
Connection, the test board 8 are mounted on the upper wedge-shaped corner block, by changing upper wedge-shaped corner block and lower wedge-shaped corner block
Angle can adjust the tilt angle of the test board 8, so as to adjust the angle of drop impact test plate 8.
Further, the astigmatism plate 15 is made of ground glass.
Further, support frame as described above 19 includes plectane main body and the multiple extensions for being arranged circumferentially in the plectane body side
Bar, the plectane main body are equipped with step, and the fluid dividing cover 7 is placed on the step of the plectane main body.
Further, all hanging rods are accepted on the top of the support pipeline section 18.
Before on-test, associated tracks and control circuit are connected.The articulated structure 20 is adjusted to required angle, and is twisted
The tight link bolt 21 is fixed, and each component is installed in the way of Fig. 1 and Fig. 2.It is solid in the oblique shock of test diesel oil drop
When body wall face, to prevent the inclined test board 8 from blocking high speed camera shooting, the articulated structure 20 and described is placed
It should be guaranteed that the link bolt 21 is parallel to shooting optical path when test board 8.The spotlight 14 is opened, its direction is debugged, makes
Its fluid dividing cover internal brightness irradiated reaches photographing request.It opens the high speed camera 9 and debugs its position, focal length, exposure
Value etc..
After the frequency converter 12 connects AC power source, the drainage blower 11 will be according to the setpoint frequency of the frequency converter 12
Rotation.Since the air inlet of the drainage blower 11 is connected with the bottom of the construction of wind tunnel 6 by the bellows 10,
Therefore under the suction of the drainage blower 11, the construction of wind tunnel 6 will suck air from upper end inlet, and in the wind-tunnel
Downward high speed steady air flow is formed in structure 6.
Under initial conditions, the relay module 3 is in an off state, and electromagnet 1 is in relaxation state at this time.According to examination
The size of required diesel oil drop is tested, the volume of diesel oil drop needed for calculating.Quantitative diesel oil is drawn using microliter syringe,
And slowly pushed to the diesel liquid to be measured of required volume with syringe at the needle point of the syringe needle 2, stablize diesel oil drop
Hang on the needle point position of the syringe needle 2.It is hung on the syringe needle 2 if the diesel oil drop of required size cannot be stablized, then
The bigger syringe needle of diameter should be replaced.
The evaporation capacity of diesel oil drop when to reduce suspension, reduces scale error, should be controlled as early as possible with the computer 5 described
Relay module 3 makes its closure.The electromagnet 1 is powered after actuation, and the syringe needle 2 will be driven quickly to twitch upwards.Institute at this time
It states the diesel oil drop hung in advance on syringe needle 2 and is detached from the syringe needle 2 whereabouts vertically due to inertia.The electromagnet 1 was powered
Length will lead to coil heating, therefore after diesel oil drop is fallen, and should control the relay mould by the computer 5 as early as possible
Block 3 is the electromagnet 1 power-off, resets armature.
After diesel oil drop is fallen from the syringe needle 2, can be entered vertically into the construction of wind tunnel 6 under the effect of gravity.Institute
State plastics accelerate pipeline section 16 in, diesel oil drop in dropping process, due to by high-speed flow around carrying and gravity,
Its speed to fall vertically can be gradually increased.After entering the quartz and shunting pipeline section 17, due to the lower end quilt of the fluid dividing cover 7
Support frame as described above 19 is closed, therefore air-flow will be flowed through from the external surrounding of the fluid dividing cover 7.And the diesel oil drop carried secretly in air-flow
Since inertia is bigger, still can enter inside the fluid dividing cover 7 along vertical direction, and finally strike support frame as described above 19
On the test board 8 on.Due to there is no gas flowing inside the fluid dividing cover 7, diesel oil drop hit wall sprawl and
Splashing process not will receive airflow influence.
The high speed camera 9 monitors there is diesel oil drop entrance inside the fluid dividing cover 7, and automatic trigger is shot.It is described
The all processes of 9 complete documentation drop impact test plate 8 of high speed camera, and image data is transferred to after the computer 5 supplies
Continuous analysis and research.
So far, single test and Image Acquisition work are completed.
If test of many times need to be continued, 11 power supply of drainage blower can be disconnected, close the high speed camera 9.The ripple
Pipe 10 pushes, and the support pipeline section 18 is slowly extracted out from the construction of wind tunnel 6, at this time can be by the support frame as described above of upper part
19, the fluid dividing cover 7 and the test board 8 take out together, and complete the cleaning wiping or replacement work of the test board 8,
Again above-mentioned component is reinstalled.
Wall speed is hit if you need to change diesel oil drop, the drainage blower 11 can be changed by adjusting the frequency converter 12
Revolving speed, so, the gas flow rate in the construction of wind tunnel 6 change, and the indirect drop that changes finally is struck test
The speed of plate 8.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (9)
1. the experimental rig that a kind of drop high speed hits wall, which is characterized in that including computer, relay module, high speed camera, electricity
Magnet, syringe needle, construction of wind tunnel, drainage blower, bellows, support pipeline section, support frame, fluid dividing cover, spotlight and astigmatism plate,
In,
The computer is separately connected the relay module and the high speed camera, the relay module and the electromagnet
Connection；
The electromagnet includes solenoid box body, iron core and return spring, the intracorporal coil of solenoid box and the relay
The connection of device module, the iron core are vertically arranged and protrude into the solenoid box body, and the return spring is installed on the iron
On core, and one end of the return spring is mounted on the solenoid box body, and the other end is mounted on the iron core, with
In the drive iron core return；
The syringe needle is fixedly mounted on the lower end of the iron core, for hanging drop；
The construction of wind tunnel is located at the underface of the syringe needle, is vertically installed on fixed bracket, and the upper end is as wind
Inflow entrance, lower end is as distinguished and admirable outlet；
The air intake vent of the drainage blower is correspondingly arranged in the distinguished and admirable exit of the construction of wind tunnel, out of described construction of wind tunnel
It extracts air and is formed in the construction of wind tunnel and stablize downward air-flow, for accelerating to fall into the liquid inside construction of wind tunnel
The falling speed of drop；
The bellows is installed at the air intake vent of the drainage blower and it accepts the support pipeline section；
The lower end of the construction of wind tunnel is protruded into the upper end of the support pipeline section, and it accepts support frame as described above；
The fluid dividing cover is placed on support frame as described above, and the upper end has aperture, using as droplet inlet, lower end closed, institute
It states between the outer wall of fluid dividing cover and the inner wall of the construction of wind tunnel there are gap, using as airflow channel；
The test board is set in the fluid dividing cover, for being collided with drop；
The spotlight and the astigmatism plate are set to by the construction of wind tunnel, and the astigmatism plate be located at the spotlight and
Between the construction of wind tunnel, for illuminating the region splashed behind the test board and drop impact test wooden partition face；
The high speed camera is horizontally placed on by the construction of wind tunnel, for shooting the splashing behind drop impact test wooden partition face
Situation.
2. the experimental rig that a kind of drop high speed according to claim 1 hits wall, which is characterized in that the construction of wind tunnel packet
Including plastics accelerates pipeline section and quartz to shunt pipeline section, with for integrating air-flow and accelerating drop, the plastics accelerate the lower end of pipeline section
The upper end for shunting pipeline section with the quartz is fixed together, and the upper end of the support pipeline section protrudes into the quartz and shunts pipeline section
Lower end.
3. the experimental rig that a kind of drop high speed according to claim 1 hits wall, which is characterized in that the drainage blower connects
It is connected to frequency converter, the frequency converter connects AC power source, and by adjusting the frequency converter, the power supply of the drainage blower can be changed
Frequency to change the gas flow rate in the construction of wind tunnel, and then is adjusted to change the revolving speed of the blade of the drainage blower
Save its acceleration effect to drop.
4. the experimental rig that a kind of drop high speed according to claim 1 hits wall, which is characterized in that the relay module
Connect DC power supply.
5. the experimental rig that a kind of drop high speed according to claim 1 hits wall, which is characterized in that the fluid dividing cover is upper
Lower open quartz glass cup, lower end are resisted against on support frame as described above and are closed by support frame as described above.
6. the experimental rig that a kind of drop high speed according to claim 5 hits wall, which is characterized in that the test board passes through
Articulated structure is mounted on support frame as described above, and the articulated structure includes upper wedge-shaped corner block and lower wedge-shaped corner block and described
Upper wedge shape corner block is connected with lower wedge-shaped corner block by link bolt, and the test board is mounted on the upper wedge-shaped corner block
On, by changing the angle of upper wedge-shaped corner block and lower wedge-shaped corner block, it can adjust the tilt angle of the test board, to adjust
The angle of whole drop impact test plate.
7. the experimental rig that a kind of drop high speed according to claim 1 hits wall, which is characterized in that the astigmatism plate is by grinding
Sand glass is made.
8. the experimental rig that a kind of drop high speed according to claim 1 hits wall, which is characterized in that support frame as described above includes
Plectane main body and the multiple hanging rods for being arranged circumferentially in the plectane body side, the plectane main body be equipped with step, described point
Stream cover is placed on the step of the plectane main body.
9. the experimental rig that a kind of drop high speed according to claim 8 hits wall, which is characterized in that the support pipeline section
Accept all hanging rods in top.
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| CN201710163583.3A CN106885686B (en) | 2017-03-20 | 2017-03-20 | A kind of drop high speed hits the experimental rig of wall |
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| CN201710163583.3A CN106885686B (en) | 2017-03-20 | 2017-03-20 | A kind of drop high speed hits the experimental rig of wall |
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| CN108458853A (en) * | 2018-03-14 | 2018-08-28 | 天津大学 | A kind of list drop accelerator |
| CN108469342A (en) * | 2018-03-28 | 2018-08-31 | 天津大学 | The experimental system of wall is hit in simulation high speed drop injection |
| CN111871634B (en) * | 2020-07-26 | 2021-07-16 | 上海交通大学 | High-speed liquid drop generating device based on cam structure |
| CN113504029B (en) * | 2021-07-19 | 2023-06-02 | 滨州学院 | Flexible wall surface adjusting device and method suitable for liquid drop collision |
| CN114323659B (en) * | 2021-12-28 | 2023-01-06 | 上海交通大学 | Temperature-controllable wall-hitting liquid film measuring device with replaceable wall surface |
| CN114577441A (en) * | 2022-03-14 | 2022-06-03 | 北京理工大学 | Gas acceleration liquid drop impact low-temperature wall surface experimental device |
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