CN2047821U - Hanging-type flow demonstrator based on bubble tracing - Google Patents
Hanging-type flow demonstrator based on bubble tracing Download PDFInfo
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- CN2047821U CN2047821U CN 89200843 CN89200843U CN2047821U CN 2047821 U CN2047821 U CN 2047821U CN 89200843 CN89200843 CN 89200843 CN 89200843 U CN89200843 U CN 89200843U CN 2047821 U CN2047821 U CN 2047821U
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Abstract
The utility model relates to a hanging-type flow demonstrator based on bubble tracing, which is characterized in that the utility model uses a slit channel swept by water as a display surface and is formed by organically assembling a self-absorption aeration structure, a slit spillway, lamp light, and a casing. The hanging-type flow demonstrator based on bubble tracing is a hanging-type teaching laboratory apparatus which uses water as fluid, micro-bubbles as tracing medium. The utility model has the advantages that a flowing image can be demonstrated under a high Reynolds number, the utility model has abundant demonstration contents, excellent effects, extremely intelligible image, wide application, easy usage, small occupation of land, low cost, energy saving, and no pollution. The utility model can be applied in various courses of experiment teaching, such as professional fluid dynamics, professional communication theory, etc.
Description
The invention belongs to the FLOW VISUALIZATION device.
In the education experiment of courses such as fluid mechanics and fluid transmission theory, often need mechanism phenomenons such as observation, analysis and research boundary-layer separation and vortex generation.Yet, because the invisibility of real fluid when flowing, make these contents in teaching, seem very abstract and make the people obscure.For this reason, a kind of device that utilizes the spike medium and can demonstrate flow phenomenon has become requisite experimental facilities in the fluid mechanics teaching.Can be used at present the mobile apparatus for demonstrating of imparting knowledge to students both at home and abroad, better with the circulating water chennel of aluminium powder trace method.This device is in a glass flume, has arranged the runner of crossing of definite shape, is fluid with water, in the upstream of runner aluminium powder is injected current.Aluminium powder under light-illuminating, can demonstrate mobile images such as vortex with the stream motion.This its shortcoming of mobile apparatus for demonstrating is: image is not too clear, is difficult in a set of equipment the multiple flow state of demonstration, and the equipment manufacturing cost height, energy consumption is big, floor area is big, and the number that can hold when at every turn observing is few.
The present invention seeks to design the mobile demonstrator of a kind of bubble trace method, it can hang over metope, and the number that can hold when at every turn observing is many, and this instrument has the transparency height, can demonstrate clearly multiple mobile image and simple and compact for structure, cost is low, characteristics such as energy-conservation, pollution-free.
Main points of the present invention are: it has slit display surface (2), self-priming aeration structure (8) (9), slit sluiceway (3), light (4) and case (1) (14).Its slit display surface can adopt transparent organic glass to make, and arranges the effigurate runner of crossing in slit, is 3-1.0mm as slit (17) clearance distance of runner, and the best is 6mm.The self-priming aeration structure is made up of the runner contraction larynx neck (8) and the suction hole (9) at display board import position.The slit sluiceway is that two slits that are positioned at display surface two sides are crossed runner (3), and flow field end is directly chewed (12) with tapping pipe and connect mutually.The case of demonstrator is handled through blacking at inner bottom plating (15).
The pressure water stream of tap water or the pressure water stream that drives through the self-loopa water pump after the water inlet pipe of the demonstrator that flows is chewed (13), flow through and shrink throat neck section (8).Because the flow velocity of throat neck section according to the bernoulli principle in the fluid dynamics, can make the pressure potential of throat neck section be reduced to below the atmospheric pressure greater than the Peak Flow Rate in the runner, so that vacuum tightness occurs.Therefore extraneous air just can pass through suction hole (9) and be incorporated in the current under the atmospheric pressure effect.Minute bubbles in the aerated flow have just formed the spike medium, flow through display surface with current, and under light shines upon setting off with base plate black, can very clearly demonstrate out nowed formings such as vortex, boundary-layer separation.Last aerated flow flow back into self-loopa water tank or draining waste effluent flume through slit sluiceway (3).So just finished the whole flow process of mobile demonstrator.
The middle and lower reaches section at the larynx neck is opened in aeration hole (9), respectively opens some micropores in its runner two sides.This micropore when stopping using, is gone back double as and is got rid of ponding effect in the display surface (2) except that being made for the aeration effect, makes display surface exempt long-term ponding and pollute.When draining the water away, the ponding of discharging from suction hole enters tapping pipe through slit cavity (7), drainage channel (11), sluicing fair water fin (10) and chews (12).The effect of fair water fin (10) is when instrument is worked, and the current in the sluiceway is imported tapping pipe chew, and preventing to sluice is back to the slit cavity and blocks air hole through drainage pipeline.
The slit display surface is to be formed by front panel (16), rear panel (18), middle laminated plank (17) three plate veneers bonding.Plate is transparent organic glass.Middle clamp plate will be processed into certain flow channel shape (scratching stream etc. as flaring, convergent, sudden expansion, sudden contraction, cylinder) as requested, shows runner to form slit.
Show in the runner that in order to make non-interference is intersegmental with ballast bar (5) water conservancy diversion at each stream between the each several part, in case the unlikely downstream that has influence on of the vortex that produces previously, and bubble is arranged in order, it is shallow to form stream.
Daylight lamp (4) is contained in display board two sides, and front cover shell (14) should cover light, in order to avoid direct projection observer's eyes.
Description of drawings:
Fig. 1 is the flow path boundary arrangenent diagram of facing structural representation and I type thereof after the mobile demonstrator of wall-hanging bubble trace method is removed face shield.
Fig. 2 is the mobile demonstrator side-looking structural representation of wall-hanging bubble trace method.
(1) is rear casing among the figure, (2) be the slit display surface, (3) be the slit sluiceway, (4) daylight lamp, (5) are the ballast bars, and (6) are diversion rods, (7) slit cavity, (8) air-breathing contraction throat neck section, (9) are suction holes, (10) are the sluicing fair water fins, (11) be drainage channel, (12) be that tapping pipe is chewed, (13) are that water inlet pipe is chewed, and (14) are face shields, (15) be the back cover base plate, (16) be slit display surface front panel, (17) are laminated planks in the slit, and (18) are slit display surface rear panels.
By different teaching requirements, seven types of this flow demonstrators in the laboratory, have been made. Take I type (such as Fig. 1) as example, acting head is 5～15 meters, and maximum output is 500cm3/ s. Light shines with 64W, and total energy consumption is 184W. Can demonstrate the mobile image on the pipeline longitudinal sections such as flaring, convergent, sudden enlargement, sudden contraction, wall impact, right-angled bend. In addition II～VII type can be demonstrated respectively orifice flowmeter, circular arc curve, cylinder streams, round end square tail formula bluff body streams, has the border jet turbulent fluctuation diffusion, the automatically fluidic in the control, the multiple mobile images such as overcurrent of YF flow spill valve spool.
Advantage of the present invention is can demonstrate than multiple flow phenomenons such as the lower various boundary layer separation of high reynolds number (more than 500～2300), vortex, turbulent fluctuation diffusion, jet wall attachment effects. Demo content is abundant, the effect excellence, and image is extremely clear, is widely used, and is easy to use, takes up an area littlely, and cost is low, and is energy-conservation, pollution-free. Be embodied in so following several respects:
Because the present invention has quoted economical and practical FLOW VISUALIZATION technology---water is the microbubble trace method of fluid, adopted the slit display surface of best runner form, self-priming aeration and self-draining special construction also have been developed into, add and join light and case, and they are combined into one dexterously, thereby when using, as long as open water supply valve, image graceful, true to nature is clear as wall chart Show clearly. Also can show clear even the microbubble of diameter below 0.5mm followed the motion rule mark of current particle. And seven Flow Meters only need take the metope of a blackboard, can demonstrate simultaneously need that circulation glass flumes wide 30 centimetres with 5, long 7 meters could demonstrate simultaneously ten surplus kind stream condition, and some stream condition such as the fluidic in the automatic control etc., also can't be demonstrated out in the glass flume. In addition, flow demonstrator can hold 20～30 people to be observed, and glass flume can only hold 5～10 people's observation. Its energy consumption is 1/10th of glass flume, takes up an area one of percentage for tank, and cost is one of tank percentage.
In the course teachings such as the engineering fluid mechanics of the specialties such as the present invention can be widely used in greatly, the relevant aviation of special secondary school universities and colleges, water conservancy, machinery, building, chemical industry, metallurgy, traffic, environmental protection, bioengineering, food industry, heat transfer, meteorology and medical science and transmission theory.
Claims (5)
1, a kind of mobile demonstrator is characterized in that: it has slit display surface [2], self-priming aeration structure [8], [9], sluiceway [3], light [4] and case [1] [14].
2, a kind of mobile demonstrator according to claim 1, it is characterized in that said slit display surface (2) is to be formed by front panel (16), rear panel (18), middle laminated plank (17) veneer bonding, material is a transparent organic glass, middle clamp plate is processed into certain flow channel shape, scratch stream etc. as flaring, convergent, sudden expansion, sudden contraction, cylinder, form slit and show runner and be provided with ballast bar (5) and diversion rod (6), slit gap distance is the 3-10 millimeter, and the best is 6 millimeters.
3, a kind of mobile demonstrator according to claim 1, it is characterized in that said self-priming aeration structure (8) (9) shrinks throat neck section (8) by the runner at display board flow inlet position and aeration hole (9) are formed, pore is opened two sides in the middle and lower reaches section of larynx neck.
4, a kind of mobile demonstrator according to claim 1, it is characterized in that said slit sluiceway (3) is that two slits that are positioned at display surface two sides are crossed runner, flow field end is directly chewed (12) connection with tapping pipe, chews (12) preceding fair water fin (10) that is equipped with at tapping pipe.
5, a kind of mobile demonstrator according to claim 1 is characterized in that said case is gone up at inner bottom plating (15) to handle through blacking.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89200843 CN2047821U (en) | 1989-01-19 | 1989-01-19 | Hanging-type flow demonstrator based on bubble tracing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89200843 CN2047821U (en) | 1989-01-19 | 1989-01-19 | Hanging-type flow demonstrator based on bubble tracing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2047821U true CN2047821U (en) | 1989-11-15 |
Family
ID=4858852
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89200843 Withdrawn CN2047821U (en) | 1989-01-19 | 1989-01-19 | Hanging-type flow demonstrator based on bubble tracing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2047821U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107331254A (en) * | 2017-08-16 | 2017-11-07 | 华北电力大学（保定） | System and method occurs for a kind of bubble for teaching demonstration |
| CN107978214A (en) * | 2017-12-27 | 2018-05-01 | 清华大学 | Automatic aeration oil stream line display device and automatic aeration method |
-
1989
- 1989-01-19 CN CN 89200843 patent/CN2047821U/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107331254A (en) * | 2017-08-16 | 2017-11-07 | 华北电力大学（保定） | System and method occurs for a kind of bubble for teaching demonstration |
| CN107978214A (en) * | 2017-12-27 | 2018-05-01 | 清华大学 | Automatic aeration oil stream line display device and automatic aeration method |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |