CN109668714A - Low temperature drop hits rigid plane experimental provision and method - Google Patents
Low temperature drop hits rigid plane experimental provision and method Download PDFInfo
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- CN109668714A CN109668714A CN201910038829.3A CN201910038829A CN109668714A CN 109668714 A CN109668714 A CN 109668714A CN 201910038829 A CN201910038829 A CN 201910038829A CN 109668714 A CN109668714 A CN 109668714A
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- liquid nitrogen
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- 238000000034 method Methods 0.000 title claims abstract description 21
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 262
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 131
- 239000007788 liquid Substances 0.000 claims abstract description 104
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 230000035939 shock Effects 0.000 claims abstract description 5
- 238000001704 evaporation Methods 0.000 claims description 7
- 230000008020 evaporation Effects 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 5
- 238000002474 experimental method Methods 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims description 2
- 229910000679 solder Inorganic materials 0.000 claims description 2
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims 2
- 239000004810 polytetrafluoroethylene Substances 0.000 claims 2
- 238000004033 diameter control Methods 0.000 claims 1
- -1 polytetrafluoroethylene Polymers 0.000 claims 1
- 238000012800 visualization Methods 0.000 abstract description 4
- 238000013480 data collection Methods 0.000 abstract description 3
- 238000009413 insulation Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 239000001273 butane Substances 0.000 description 1
- 239000012611 container material Substances 0.000 description 1
- 235000019628 coolness Nutrition 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical compound FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Classifications
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B25/00—Models for purposes not provided for in G09B23/00, e.g. full-sized devices for demonstration purposes
Abstract
The present invention provides low temperature drop shock rigid plane experimental provision and method, the experimental provision include liquid nitrogen liquid-supplying system, impact cavity system, low temperature droplet generator, visualization and data collection system；The liquid nitrogen liquid-supplying system includes liquid nitrogen pipeline and emptying bypass, the impact cavity system shell is made of heat insulation layer and pre- cold passage, and it is connect with vacuum pump, pressure sensor, temperature sensor, inside is knocked wall surface, scale, low temperature droplet generator comprising height-adjustable rigidity, and the visualization and data collection system include data collector, light source and high-speed camera.The low-temperature steam that the present invention is evaporated rapidly using liquid nitrogen hits intracavitary portion's pre-cooling by the head-on collision of pre- cold passage, realizes the Multi-class propagation of liquid nitrogen；It is knocked the size that wall face height changes liquid-drop diameter and stroke speed by adjusting liquid nitrogen liquid supply pressure, 90 ° of bend pipe pipe diameter sizes and rigidity, captures drop knockout process using high-speed camera.
Description
Technical field
The present invention relates to low temperature drops to hit rigid plane experimental provision, the invention further relates to the operating method of the device,
Have the characteristics that superior heat-insulating property, low temperature liquid-drop diameter and speed be controllable, knockout process visualization.
Background technique
Currently, misting cooling is the efficient type of cooling of great potential, process be related to single drop hit wall surface, drop with
It interacts between drop and drop and liquid film, belongs to complicated multiphase flow problem, this is just needed in simplified flowing geometry item
Basic research is carried out to its fluid dynamics under part.Although misting cooling can not be expressed as the machinery that single drop hits wall surface
It is added, but single drop hits rigid plane and is widely used for the process of description spray hits and predicts its result.
Single drop hits the dynamics of rigid plane and thermodynamics experiment is studied mostly with water, ethanol solution, diesel oil, butane etc.
Based on room temperature medium, droplet is generated by syringe；Since boiling point is lower under normal pressure for the cryogenic fluids such as liquid nitrogen, use is above-mentioned
Traditional approach generates low temperature drop and evaporates immediately completely in syringe needle hole bottom, can not form stable droplet, causes using biography
System experimental provision can not carry out the experimental study that low temperature drop hits rigid plane.
Summary of the invention
Present invention aims at solve traditional experiment device to be difficult to carry out the experimental study of low temperature drop shock rigid plane
The problem of, low temperature drop is provided and hits rigid plane experimental provision, convenient for carrying out the dynamics that low temperature drop hits rigid plane
And the basic research of thermodynamic behaviour, have that impact cavity heat-insulating property is excellent, low temperature liquid-drop diameter and speed are controllable, hit
The features such as journey visualizes.
The experimental provision includes impact cavity；Impact cavity outer layer sets gradually pre- cold passage, vacuum layer, heat preservation from inside to outside
Layer；The pre-cooling vias inner walls are provided with the entrance for communicating impact cavity and pre- cold passage, and pre-cooling channel outer wall is provided with outlet,
Outlet sequentially passes through vacuum layer, insulating layer and external vacuum pump by pipeline and connects；
Cylindricality liquid nitrogen container, 90 ° of bend pipes and rigidity are installed in above-mentioned impact cavity and are knocked face；The cylindricality liquid nitrogen container and
90 ° of bend pipes constitute low temperature droplet generator；The horizontal tube of 90 ° of bend pipes is partially submerged into the side wall of cylindricality liquid nitrogen container；90 ° of bend pipes
Vertical tube portion is located at impact cavity horizontal direction center, is rigidly knocked face and is located at immediately below it；It is also equipped with inside impact cavity
Temperature sensor, pressure sensor, scale, light source, high-speed camera and data collector；Data collector and temperature sensor
It is connected with pressure sensor and high-speed camera；
The experimental provision further includes high-pressure nitrogen bottle；High-pressure nitrogen bottle outlet after pressure reducing valve, pressure sensor by being separately connected
Emptying bypass and two branches of liquid nitrogen pipeline；Two branches are connect after merging with liquid nitrogen bath；Cut-off is set in the emptying bypass
Valve, the liquid nitrogen pipe road set gradually shut-off valve, Dewar container for liquefied nitrogen tank, low-temperature solenoid valve；The liquid nitrogen bath outlet is through inflow-rate of water turbine
The cylindricality liquid nitrogen container inside above-mentioned impact cavity is connected after meter；Pipeline between the flowmeter and cylindricality liquid nitrogen container is successively worn
Cross insulating layer, vacuum layer, pre- cold passage；Above-mentioned Dewar container for liquefied nitrogen tank top is connected to relief valve and pressure sensor.
The invention further relates to the application methods that low temperature drop hits rigid plane experimental provision, and the method steps are as follows:
Before experiment starts, all valves are in closed state in addition to relief valve.
Step 1 first turns on light source and high-speed camera, and 90 ° of bend pipe lower ends are knocked face away from rigidity in adjustment impact cavity
Distance, fixed height, successively open pressure reducing valve and emptying bypass shut-off valve, make nitrogen pass sequentially through emptying bypass, liquid nitrogen
Pond, flowmeter, cylindricality liquid nitrogen container, 90 ° of bend pipes enter inside impact cavity, to exclude the air in impact cavity；
Step 2 starts vacuum pump, maintains to hit cavity pressure near 1 MPa, continues evacuation procedure to hitting chamber air
It is replaced as nitrogen completely；
Step 3 closes the shut-off valve of emptying bypass, opens the shut-off valve and low-temperature solenoid valve of liquid nitrogen pipeline, makes Dewar container for liquefied nitrogen tank
Interior liquid nitrogen is discharged into liquid nitrogen pipeline under the action of high pressure nitrogen, and liquid nitrogen first passes through liquid nitrogen bath and is cooled near 78 K in advance, passes through stream
Flowmeter measurement liquid nitrogen enters volume flow rate when low temperature droplet generator, records volume flow rate；
Step 4 can not hit rigidity in droplets and be knocked face, it is necessary to first for the droplets of liquid nitrogen Quick-gasifying prevented
Liquid nitrogen is sprayed into impact cavity, reduces impact cavity interior environment temperature, adjusts pressure reducing valve, 90 ° of bend pipe diameters control liquid nitrogen
Volume flow rate, once tube wall is cooling, liquid spills into the outer surface of pipe by the aperture of 90 ° of bend pipes, accumulates in welding ends, and
It is detached under gravity and forms drop, record hits cavity pressure and temperature；
Step 5 calculates using high-speed camera and scale Calibration droplets diameter and hits initial velocity, captures drop and hits rigid quilt
Motor behavior and evaporation process after striking face.
The liquid nitrogen being stored in Dewar container for liquefied nitrogen tank is discharged into liquid nitrogen pipeline through liquid nitrogen bath by the nitrogen in the high-pressure nitrogen bottle
Entering Low Temperature Liquid after pre-cooling and drips generator, liquid nitrogen is spilt into the outer surface of pipe by the aperture of 90 ° of bend pipes, accumulates in welding ends,
And separated under own wt, form stable droplets of liquid nitrogen, droplets of liquid nitrogen make vertically downward the movement of falling object finally with rigid quilt
Striking face is hit；On the one hand, since liquid nitrogen boiling point is lower, it is necessary to the air in impact cavity be discharged, be otherwise easy at 90 °
The tapping of bend pipe occurs ice and blocks up, and on the other hand, environment temperature is relatively high, is rapid evaporation after liquid nitrogen atomization and largely generates
Low-temperature steam hits cavity pressure and increases, and the pre-cooled feeder connection of low-temperature steam is forced to enter pre- cold passage and around impact cavity one
All heel row effectively intracavitary to shock can be pre-chilled in addition to chamber, drop rapid steaming before hitting rigid plane is inhibited to distribute
Entirely.
The cylindricality liquid nitrogen container and 90 ° of bend pipes constitute low temperature droplet generator, and the cylindricality liquid nitrogen container material is poly-
Tetrafluoroethene, specification are D=3 cm, H=3 cm, and 90 ° of bend pipe bottoms are blocked by solder, and intermediate outer wall is provided with aperture, material
For stainless steel, caliber is adjustable in 0.5~3 mm, and the bend pipe by replacing different tube diameters can control low temperature liquid-drop diameter
Size.
The rigidity is knocked face adjustable, 1 cm of wall surface area of height2, material is red copper, and scale is vertically fixed on rigidity
It is knocked on face, scale is used for Calibration droplets diameter.
The present invention is in view of the deficienciess of the prior art, by adjusting liquid supply pressure, 90 ° of bend pipe diameters are realized to low
The control of warm liquid-drop diameter；The initial velocity that the height adjustment low temperature drop in face is hit is knocked by adjusting rigidity；Using liquid nitrogen
The pre- cold passage head-on collision of steam is hit intracavitary portion and is pre-chilled, and the rapid evaporation of low temperature drop is inhibited；Using high-speed camera and fixation
The diameter of low temperature drop is demarcated in the Vertical surveyors' staff for being rigidly knocked face, and captures the dynamic that drop hits rigid plane
Sprawl process.
Detailed description of the invention
Fig. 1 is that low temperature drop of the present invention hits rigid plane experimental provision composition schematic diagram；
Fig. 2 is the structural schematic diagram of low temperature droplet generator of the present invention.
Figure label title: 1 high-pressure nitrogen bottle, 2 pressure reducing valves, 3 pressure sensors, 4 shut-off valves, 5 Dewar container for liquefied nitrogen tanks, 6 are let out
Pressure valve, 7 emptying bypasses, 8 liquid nitrogen pipelines, 9 low-temperature solenoid valves, 10 liquid nitrogen baths, 11 flowmeters, 12 insulating layers, 13 vacuum layers, 14 are in advance
Cold passage, 15 90 ° of bend pipes, 16 high-speed cameras, 17 scales, 18 rigidity be knocked face, 19 vacuum pumps, 20 cylindricality liquid nitrogen containers,
21 temperature sensors, 22 light sources, 23 impact cavities, 24 data collectors.
Specific implementation method
Rigid plane experimental provision is hit below in conjunction with Detailed description of the invention low temperature drop of the invention, Fig. 1 is low temperature drop of the present invention
Rigid plane experimental provision composition schematic diagram is hit, which includes: liquid nitrogen liquid-supplying system, impact cavity system, low temperature drop hair
Raw device, visualization and data collection system；High-pressure nitrogen bottle 1 and pressure reducing valve 2, shut-off valve 4, Dewar container for liquefied nitrogen tank 5, low-temperature solenoid valve
9 separately constitute emptying bypass 7, liquid nitrogen pipeline 8, by liquid nitrogen bath 10, flowmeter 11 after emptying bypass 7 and 8 parallel connection of liquid nitrogen pipeline
It is connect with cylindricality liquid nitrogen container 20,90 ° of 15 horizontal tubes of bend pipe are partially submerged into 20 side wall of cylindricality liquid nitrogen container and form drop
Device, height-adjustable rigidity are knocked 18 upper surface of face setting scale 17, the pipe of vacuum pump 19 and pre- 14 left side top of cold passage
Road connection, insulating layer 12, vacuum layer 13 are 23 heat insulation layer of impact cavity, pressure sensor 3, temperature sensor 21, high-speed camera
16 connect with external data collector 24.
Fig. 2 is the structural schematic diagram of low temperature droplet generator of the present invention, and low temperature droplet generator includes cylindricality liquid nitrogen container
The horizontal tube of 20 and 90 ° of bend pipes, 15,90 ° of bend pipes 15 is partially submerged into the side wall of cylindricality liquid nitrogen container 20, and liquid nitrogen is pre- through liquid nitrogen bath 10
Enter cylindricality liquid nitrogen container 20 and 90 ° bend pipe 15 after cold, once tube wall is cooling, liquid nitrogen is spilt by the aperture of 90 ° of bend pipes 15
The outer surface of pipe accumulates in welding ends, and separates under own wt, that is, forms stable droplets of liquid nitrogen.
System first has to opening emptying bypass 7 and the gas in impact cavity 23 is sufficiently displaced from into nitrogen after opening, to prevent
It is stifled that ice occurs；The liquid nitrogen being stored in Dewar container for liquefied nitrogen tank 5 is discharged into liquid nitrogen pipeline 8 through liquid nitrogen bath by the nitrogen in high-pressure nitrogen bottle 1
Enter droplet generator after 10 pre-coolings and generate stable low temperature drop, drop freely falling body hits rigidity and is knocked face 18, liquid nitrogen bath
10 in order to ensure when liquid nitrogen enters low temperature droplet generator temperature keep 78 K near；The purpose of pre- cold passage 14 is to make full use of
The low temperature nitrogen of liquid nitrogen vaporization reduces temperature in impact cavity 23, in the nitrogen of the entrance guidance evaporation of pre- 14 right hand top of cold passage
It is exported after a week by pre- 14 left side top of cold passage outside discharge impact cavity 23 around channel；Vacuum pump 19 is for stablizing impact cavity 23
Interior pressure measures liquid-drop diameter in 1 MPa, using scale 17 and high-speed camera 16.
Above-mentioned Dewar container for liquefied nitrogen tank 5 is liquid nitrogen liquid supply equipment, provides the liquid nitrogen of reliable abundance for system, Dewar container for liquefied nitrogen tank 5 and
Pressure sensor 3 and the connection of relief valve 6 prevent slow evaporation during liquid nitrogen long term storage from pressure in Dewar container for liquefied nitrogen tank 5 being caused to increase
Greatly；
Low temperature drop hits the application method of rigid plane experimental provision, and the method steps are as follows:
(1) light source and high-speed camera are first turned on, the distance that 90 ° of bend pipe lower ends in impact cavity are knocked face away from rigidity is adjusted,
Fixed height successively opens the shut-off valve of pressure reducing valve and emptying bypass, and nitrogen is made to pass sequentially through emptying bypass, liquid nitrogen bath, flow
Meter, cylindricality liquid nitrogen container, 90 ° of bend pipes enter inside impact cavity, to exclude the air in impact cavity；
(2) start vacuum pump, maintain to hit cavity pressure near 1 MPa, it is complete to chamber air is hit to continue evacuation procedure
It is replaced as nitrogen；
(3) shut-off valve for closing emptying bypass, opens the shut-off valve and low-temperature solenoid valve of liquid nitrogen pipeline, makes in Dewar container for liquefied nitrogen tank
Liquid nitrogen is discharged into liquid nitrogen pipeline under the action of high pressure nitrogen, and liquid nitrogen first passes through liquid nitrogen bath and is cooled near 78 K in advance, passes through flowmeter
Measurement liquid nitrogen enters volume flow rate when low temperature droplet generator, records volume flow rate；
(4) it is the droplets of liquid nitrogen Quick-gasifying that prevents, rigidity can not be hit in droplets and be knocked face, it is necessary to first to hits
Intracavitary injection liquid nitrogen is hit, impact cavity interior environment temperature is reduced, adjusts pressure reducing valve, 90 ° of bend pipe diameters control liquid nitrogen volume
Flow rate, once tube wall is cooling, liquid is spilt into the outer surface of pipe by the aperture of 90 ° of bend pipes, accumulates in welding ends, and in gravity
Lower be detached from of effect forms drop, and record hits cavity pressure and temperature；
(5) high-speed camera and scale Calibration droplets diameter are utilized, calculates and hits initial velocity, drop shock rigidity is captured and is knocked
Motor behavior and evaporation process behind face.
Claims (4)
1. a kind of low temperature drop hits rigid plane experimental provision, which is characterized in that
The experimental provision includes impact cavity (23)；Impact cavity (23) outer layer sets gradually pre- cold passage (14), vacuum from inside to outside
Layer (13), insulating layer (12)；Pre- cold passage (14) inner wall, which is provided with, communicates impact cavity (23) and pre- cold passage (14)
Entrance, pre- cold passage (14) outer wall are provided with outlet, outlet by pipeline sequentially pass through vacuum layer (13), insulating layer (12) with outside
Portion's vacuum pump (19) connection；
Cylindricality liquid nitrogen container (20), 90 ° of bend pipes (15) and rigidity are installed in above-mentioned impact cavity (23) and are knocked face (18)；It is described
Cylindricality liquid nitrogen container (20) and 90 ° of bend pipes (15) constitute low temperature droplet generator；The horizontal tube of 90 ° of bend pipes (15) is partially submerged into column
The side wall of shape liquid nitrogen container (20)；The vertical tube portion of 90 ° of bend pipes (15) is located at impact cavity (22) horizontal direction center, rigid quilt
Striking face (18) is located at immediately below it；Temperature sensor (21), pressure sensor (3), mark are also equipped with inside impact cavity (22)
Ruler (17), light source (22), high-speed camera (16) and data collector (24)；Data collector (24) and temperature sensor (21)
It is connected with pressure sensor (3) and high-speed camera (16)；
The experimental provision further includes high-pressure nitrogen bottle (1)；High-pressure nitrogen bottle (1) outlet passes through pressure reducing valve (2), pressure sensor
(3) emptying bypass (7) and (8) two branches of liquid nitrogen pipeline are separately connected after；Two branches merge after with liquid nitrogen bath (10) entrance
Connection；Shut-off valve (4) are set on the emptying bypass (7), shut-off valve (4), liquid nitrogen Du are set gradually on the liquid nitrogen pipeline (8)
Crock (5), low-temperature solenoid valve (9)；Liquid nitrogen bath (10) outlet is connected after flowmeter (11) in above-mentioned impact cavity (22)
The cylindricality liquid nitrogen container (20) in portion；Pipeline between the flowmeter (11) and cylindricality liquid nitrogen container (20) sequentially passes through insulating layer
(12), vacuum layer (13), pre- cold passage (14)；Relief valve (6) and pressure sensor are connected at the top of above-mentioned Dewar container for liquefied nitrogen tank (5)
(3).
2. hitting rigid plane experimental provision by low temperature drop described in claim 1, it is characterised in that: the cylindricality liquid nitrogen holds
Device (20) material is polytetrafluoroethylene (PTFE), and specification is D=3 cm, H=3 cm, and 90 ° of bend pipes (15) bottom is blocked by solder, intermediate
Outer wall is provided with aperture, and material is stainless steel, and caliber is adjustable in 0.5~3 mm.
3. hitting rigid plane experimental provision by low temperature drop described in claim 1, it is characterised in that: the rigidity is knocked
Face (18) adjustable, 1 cm of wall surface area of height2, material is red copper, and scale (17) is vertically fixed on rigidity and is knocked on face (18).
4. hitting rigid plane experimental provision method by low temperature drop described in claim 1, which is characterized in that steps are as follows:
Before experiment starts, all valves are in closed state in addition to relief valve (6)；
Step 1, first turns on light source (22) and high-speed camera (16), in adjustment impact cavity (23) 90 ° of bend pipe (15) lower ends away from
Rigidity is knocked the distance of face (18), and fixed height is successively opened the shut-off valve (4) of pressure reducing valve (2) and emptying bypass (7), made
Nitrogen pass sequentially through emptying bypass (7), liquid nitrogen bath (10), flowmeter (11), cylindricality liquid nitrogen container (20), 90 ° of bend pipes (15) into
It is internal to enter impact cavity (23), to exclude the air in impact cavity (23)；
Step 2 starts vacuum pump (19), maintains impact cavity (23) interior pressure near 1 MPa, continues evacuation procedure to shock
Chamber (23) interior air is replaced as nitrogen completely；
Step 3 closes the shut-off valve (4) of emptying bypass (7), opens the shut-off valve (4) and low-temperature solenoid valve of liquid nitrogen pipeline (8)
(9), the liquid nitrogen in Dewar container for liquefied nitrogen tank (5) is made to be discharged into liquid nitrogen pipeline (8) under the action of high pressure nitrogen, liquid nitrogen first passes through liquid nitrogen bath
(10) it is cooled near 78 K in advance, measures volume flow rate when liquid nitrogen enters low temperature droplet generator, record by flowmeter (11)
Volume flow rate；
Step 4 can not hit rigidity in droplets and be knocked face (18) for the droplets of liquid nitrogen Quick-gasifying prevented, must
Liquid nitrogen must be first sprayed into impact cavity (23), reduces impact cavity (23) interior environment temperature, adjust pressure reducing valve (2), 90 ° of bend pipes
(15) diameter controls liquid nitrogen volume flow rate, once tube wall is cooling, liquid spills into pipe by the aperture of 90 ° of bend pipes (15)
Outer surface accumulates in welding ends, and is detached from forms drop under the effect of gravity, records (23) pressure and temperature in impact cavity；
Step 5 calculates using high-speed camera (16) and scale (17) Calibration droplets diameter and hits initial velocity, captures drop and hits
Hit motor behavior and evaporation process after being rigidly knocked face (18).
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|---|---|---|---|
| CN201910038829.3A CN109668714B (en) | 2019-01-16 | 2019-01-16 | Experimental device and method for impacting rigid wall surface by low-temperature liquid drops |
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| CN201910038829.3A CN109668714B (en) | 2019-01-16 | 2019-01-16 | Experimental device and method for impacting rigid wall surface by low-temperature liquid drops |
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| CN110530603A (en) * | 2019-07-09 | 2019-12-03 | 西安交通大学 | Low boiling point high volatile medium atmospheric pressure environment drop formation, vapo(u)rability are observed and hit wall pilot system and method |
| CN111665170A (en) * | 2020-06-16 | 2020-09-15 | 中国石油大学(华东) | Liquid drop impact experimental device for quantitatively controlling deformation and tension of flexible substrate through ventilation |
| CN113280570A (en) * | 2021-07-13 | 2021-08-20 | 中国飞机强度研究所 | Supercooled water drop generating device |
| CN113588497A (en) * | 2021-08-02 | 2021-11-02 | 安徽工程大学 | Experimental device for be used for studying liquid drop evolution process under impact |
| CN113984598A (en) * | 2021-09-30 | 2022-01-28 | 西安交通大学 | Liquid nitrogen liquid drop preparation facilities with controllable particle size |
| CN114460125A (en) * | 2022-01-21 | 2022-05-10 | 西安航空学院 | Experimental device and method for metal surface supercooling liquid drop solidification |
| 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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| CN113280570A (en) * | 2021-07-13 | 2021-08-20 | 中国飞机强度研究所 | Supercooled water drop generating device |
| CN113588497A (en) * | 2021-08-02 | 2021-11-02 | 安徽工程大学 | Experimental device for be used for studying liquid drop evolution process under impact |
| CN113588497B (en) * | 2021-08-02 | 2024-02-23 | 安徽工程大学 | Experimental device for be used for studying drop evolution process under impact effect |
| CN113984598A (en) * | 2021-09-30 | 2022-01-28 | 西安交通大学 | Liquid nitrogen liquid drop preparation facilities with controllable particle size |
| CN114460125A (en) * | 2022-01-21 | 2022-05-10 | 西安航空学院 | Experimental device and method for metal surface supercooling liquid drop solidification |
| CN114460125B (en) * | 2022-01-21 | 2023-11-03 | 西安航空学院 | Experimental device and method for solidifying supercooled liquid drops on metal 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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| CN109668714B (en) | 2023-11-07 |
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