CN201259461Y - Low speed wind tunnel - Google Patents
Low speed wind tunnel Download PDFInfo
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- CN201259461Y CN201259461Y CNU2008202182470U CN200820218247U CN201259461Y CN 201259461 Y CN201259461 Y CN 201259461Y CN U2008202182470 U CNU2008202182470 U CN U2008202182470U CN 200820218247 U CN200820218247 U CN 200820218247U CN 201259461 Y CN201259461 Y CN 201259461Y
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Abstract
The utility model relates to a low-speed wind tunnel. The wind tunnel is generally of a long cylindrical shape that is arranged in the transverse direction, and is provided with a closed-jet structure and an open-jet structure, which can be modified. A contraction section, a test section, a diffusion section and a fan section are arranged from a wind inlet to a wind outlet; a rectifying network is arranged at the wind-direction upstream of the test section, and a honeycomb device is arranged between the contraction section and the test section; the closed-jet structure and the open-jet structure can be modified and exchanged, namely, the rectifying network is disassembled from the wind-direction upstream of the test section of the closed-jet structure and is installed at the wind-direction downstream of the test section of the closed-jet structure, and the honeycomb device is disassembled between the contraction section and the test section of the closed-jet structure and is installed between the test section and the diffusion section of the closed-jet structure; and the function of the contraction section in the closed-jet structure can be exchanged with the function of the diffusion section. The wind tunnel is modified to be of a structure with the closed-jet and the mutual-jet being exchanged with each other on the basis of the original closed-jet structure, thereby favoring the test research, saving the test cost, improving the direct effect of the interior of the wind tunnel, and increasing the service life of the wind tunnel.
Description
Technical field
The utility model relates to the device of the anti-wind scorpion in forest belt of a kind of suitable farmland, forest experiment usefulness, specifically a kind of low-speed wind tunnel.
Background technology
The dynamic effect in forest belt is one of the main effects in forest belt, and people lay stress in the anti-wind scorpion in forest belt, and has obtained consistent view.Along with the needs of production practices development and deepening continuously of theoretical research, the degree of depth of research and range also constantly increase, be of the influence (comprise mean motion and turbulent flow) of further investigation forest belt near air flow structure feature it, the utility model utilizes the wind tunnel simulation experiment method, to obtain necessary scientific research data.
Wind-tunnel is actually a kind of device that can cause the man-made airflow of certain speed therein on demand and can carry out various aerodynamic simulation tests therein, and it is widely used in fields such as the anti-wind scorpion in aviation, meteorology, engineering and forest belt.By gas velocity, wind-tunnel can be divided into low-speed wind tunnel, high subsonic wind tunnel and transonic speed, supersonic speed, hypersonic wind tunnel.By working method, wind-tunnel can be divided into continuous firing formula wind-tunnel, intermittent wind tunnel; Can be divided into two kinds of open type, closed types by structure.Wind-tunnel partly is made up of contraction section, experimental section, diffuser and measurement control etc. usually.The general genus low-speed wind tunnel of using on the meteorology mainly contains instrument calibrating wind-tunnel, cloud and mist experimental wind tunnel, atmospheric environment simulation wind-tunnel etc.Instrument calibrating wind-tunnel is used for calibrating, checking instrument for wind measurement and the dynamic performance of these instruments is studied.The cloud and mist experimental wind tunnel is used for simulating the microprocess that the atmospheric envelope cloud and mist drips variation, and at this moment the control system of temperature, humidity, pressure also need be arranged in the wind-tunnel.
Wind tunnel experiment is with the experiment place of high-tech means in the various natural wind phenomenons of lab simulation.The big fan of wind-tunnel will simulate various wind-force, by cellular mozzle, equably or natural wind simulating blow on the model of being tested, thereby for the wind-engaging situation of bridge, building, automobile, meadow, forest provides various accurate data, for architectural design and scientific research provide reliable scientific basis.
In forest belt, the windproof Study on Effect in meadow, application be low-speed wind tunnel, adopt wooden or metal material is made, to its inside weak effect directly perceived, and form is single.
The utility model content
At the defectives such as weak effect directly perceived that exist in the prior art, the technical problems to be solved in the utility model provides a kind of directly perceived effective and can change the low-speed wind tunnel of airintake direction as required.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is:
A kind of low-speed wind tunnel of the utility model, integral body is the long tubular of horizontally set, have closed type or the open type structure that to reequip, from the air inlet to the air outlet, comprise contraction section, experimental section, diffuser and fan section successively, the wind direction upstream of experimental section is provided with screens, is provided with honeycomb between contraction section and the experimental section.
Described closed type structure and open type structure can be reequiped exchange, and promptly screens is pulled down from the wind direction upstream of the experimental section of closed type structure, are installed on the wind direction downstream of the experimental section of closed type structure, become the upstream of the experimental section of open type structure; Honeycomb is pulled down between the contraction section of closed type structure and experimental section, is installed between the experimental section and diffuser of closed type structure; The contraction section of closed type structure and diffuser exchange function become the contraction section and the diffuser of open type structure; In the fan section of described closed type structure, fan is the air suction type operation; In the fan section of described open type structure, fan is the air blowing type operation; The main body of described contraction section, experimental section, diffuser and fan section is organic glass and makes.
The utlity model has following beneficial effect and advantage:
1. the utility model is remained silent and the interchangeable structure of open type for being adapted as on the basis of original closed type structure, the model unanimity of being surveyed, measure of the influence of the direction of motion of the protection effect of shelter-forest and wind under the also consistent situation of condition to crop, the result who draws is differentiated, the mutual reference of the data that draw, the result reaches optimum condition, helps experimental study, and has saved experimental cost.
2. the utility model general frame adopts pmma material to make, and is intuitively effective to its inside, and increases serviceable life.
Description of drawings
Fig. 1 is the utility model air suction type structural representation of remaining silent;
Fig. 2 is the inner isolated tree model synoptic diagram that adopts of the utility model;
The leather hose pick-up structural representation that Fig. 3 adopts for the utility model;
Fig. 4 is the utility model opening bleed type structural representation.
Embodiment
As shown in Figure 1, the utility model low-speed wind tunnel is the low-speed wind tunnel of a kind of suitable farmland, forest experiment usefulness, is the long tubular of horizontally set, general frame is that pmma material is made, intuitively effective, increase serviceable life, and have closed type and the two kinds of structures of open type that can reequip.The closed type structure is the air draught form, the open type structure is the blowing form, from the air inlet to the air outlet, comprise contraction section 1, experimental section 2, diffuser 3 and fan section 4 successively, the wind direction upstream of experimental section 2 is provided with screens 5, is provided with honeycomb 6 between contraction section 1 and the experimental section 2 and between experimental section 2 and the diffuser 3.
The closed type structure comprises contraction section 1, experimental section 2, diffuser 3 and fan section 4 successively from the air inlet to the air outlet, length overall is 962cm.Experimental section 2 sectional areas are got the square of 40cm * 40cm in the present embodiment, and the front end of contraction section 1 is provided with screens 5, are provided with honeycomb 6 between contraction section 1 and the experimental section 2, the fan 7 air suction types operation in the fan section 4.
A in the formula
0For discharge area (it is long-pending to equal the experimental section entrance section), be taken as 40cm * 40cm; Import sectional area A
1=nA
0N is a shrinkage ratio, generally gets n=6; Contraction section 1 length l is taken as experimental section sectional area characteristic length D
01.8 times; D
0Ask calculation according to following formula:
In the formula
Be called hydraulic radius, so can try to achieve l=72cm; X is the distance apart from inflow point, the cross-sectional area A at different distance x place
xCan calculate according to following formula with its length of side.
Be experimental section 2 behind the contraction section 1, also claim active section, model experiment is from here on.Therefore it is stable to require on experimental section 2 each cross section wind speed to be evenly distributed, wind direction and parallel axes.So wall should be straight, smooth and airtight, can not leak gas.By porch 210-250cm is the stabilization sub stage, relies to cause full-blown boundary layer; The high 5cm that presses of model calculates, and the distance that influences wind speed is pressed doubly " tree " high calculate (about 300-400cm) of 50-100, so experimental section is taken as 600-700cm, so that lay observation instrument.
Diffuser 3 has a large amount of air to be discharged from wind-tunnel open circuit exit, therefore loses considerable kinetic energy, influences the principal element of wind-tunnel efficient often, and its wasted power P is:
M is the air quality of discharging the unit interval in the formula, and V is the average velocity in exit.
Honeycomb 6 is the cellular components that are made of foil.The out-of-date torsion phenomenon that can improve air-flow greatly of air flow stream is placed in the porch of experimental section 2.
The surveying instrument of gas velocity is the underlying instrument of wind-tunnel observation, and precision prescribed is very high.Generally take off pipe receptor (being installed on the 50cm place, downstream of experimental section) with skin and survey wind, present embodiment adopts structure as shown in Figure 3, is made up of static tube 12, stagnation pressure tube 13, multiple tube 14, and its principle is to come calculation of wind speed by the dynamic pressure that records.Its relational expression can push away to such an extent that be by theory:
U is a wind speed in the formula, and ξ is bordering on 1 instrument constant, p
1Be general pressure, p is a static pressure, and ρ is an atmospheric density.So as recording p
1-p=Δ p, and ρ then can calculate wind speed u.
Adopt DISA-55M hot line air meter and remote monitoring computer interconnection.The collector of data and processing are carried out continuously, the probe of hot line air meter is installed on the interior frame of axes of experimental section (install position, 50cm place before the centre in experimental section), outside wind-tunnel, do three dimensions and move, reach predetermined observation position by remote monitoring computer control frame of axes.
Present embodiment adopts the compensation micromanometer of JM-9 type (being installed on the position of the middle 150cm of distance in the experimental section), measures the air-flow static pressure, is interior towards liquid with water, and measurement result can be accurate to 0.001mm water column height.
As shown in Figure 2, the forest belt model is made by plastic tree, high 10cm, number in the figure 8 be the cypress branch, 9 for pine piece, 10 for five-ply board, 11 for iron plate.By regulating the coefficient of air infiltration that spacing in the rows, line-spacing and line number change the forest belt model, forest belt model the ratio of width to height approximate 1.
The open type structure as shown in Figure 4, be with the difference of embodiment 1: screens 5 is dismantled from the position of closed type structure, be installed between experimental section 2 and the diffuser 3, become the upstream of the experimental section 2 of open type structure, honeycomb 6 is pulled down between the contraction section 1 of closed type structure and experimental section 2, be installed between the experimental section 2 and diffuser 3 of closed type structure, the contraction section 1 and diffuser 3 exchange functions of closed type structure, become respectively diffuser 1 in the open type structure ', contraction section 3 ', fan 7 is the air blowing type operation.
Among the embodiment 1,2, the hole body of two kinds of low-speed wind tunnels is identical, and in the model unanimity of being surveyed, under the also consistent situation of condition, the result who draws is differentiated.Respectively make once with a kind of experiment of open type structure and closed type structure priority handle so, the mutual reference of the data that draw, the result reaches optimum condition.
The utility model is from needs, with the air-breathing low-speed wind tunnel of closed type, change on the basis of original structure handle after, the air suction type of remaining silent originally makes into to remain silent air-breathing, two kinds of experimental tools of again can opening blowing.
Claims (5)
1. low-speed wind tunnel, integral body is the long tubular of horizontally set, it is characterized in that: have closed type and the open type structure that to reequip, from the air inlet to the air outlet, comprise contraction section (1), experimental section (2), diffuser (3) and fan section (4) successively, the wind direction upstream of experimental section (2) is provided with screens (5), is provided with honeycomb (6) between contraction section (1) and the experimental section (2).
2. by the described low-speed wind tunnel of claim 1, it is characterized in that: described closed type structure and open type structure can be reequiped exchange, be that screens (5) is pulled down from the wind direction upstream of the experimental section (2) of closed type structure, be installed on the wind direction downstream of the experimental section (2) of closed type structure, become the upstream of the experimental section (2) of open type structure; Honeycomb (6) is pulled down between the contraction section (1) of closed type structure and experimental section (2), is installed between the experimental section (2) and diffuser (3) of closed type structure; The contraction section of closed type structure (1) and diffuser (3) exchange function become the contraction section (3 ') and diffuser (1 ') of open type structure.
3. by claim 1 or 2 described low-speed wind tunnels, it is characterized in that: in the fan section (4) of described closed type structure, fan (7) is the air suction type operation.
4. by claim 1 or 2 described low-speed wind tunnels, it is characterized in that: in the fan section (4) of described open type structure, fan (7) is the air blowing type operation.
5. by the described low-speed wind tunnel of claim 1, it is characterized in that: the main body of described contraction section (1), experimental section (2), diffuser (3) and fan section (4) is organic glass and makes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202182470U CN201259461Y (en) | 2008-09-27 | 2008-09-27 | Low speed wind tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202182470U CN201259461Y (en) | 2008-09-27 | 2008-09-27 | Low speed wind tunnel |
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| CN201259461Y true CN201259461Y (en) | 2009-06-17 |
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|---|---|---|---|
| CNU2008202182470U Expired - Fee Related CN201259461Y (en) | 2008-09-27 | 2008-09-27 | Low speed wind tunnel |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102192828A (en) * | 2010-03-02 | 2011-09-21 | 中国科学院理化技术研究所 | Low temperature wind tunnel |
| CN102323037A (en) * | 2011-05-19 | 2012-01-18 | 中国科学院寒区旱区环境与工程研究所 | Movable and portable wind erosion tunnel |
| CN102407947A (en) * | 2011-08-15 | 2012-04-11 | 中国科学院力学研究所 | Shock tunnel detonation double-driving method and device |
| CN102435412A (en) * | 2011-12-10 | 2012-05-02 | 常州晟宇车辆部件厂 | Wind tunnel test device |
| CN103149007A (en) * | 2013-01-29 | 2013-06-12 | 中国科学院力学研究所 | Detonation drive shock tunnel forming membrane |
| CN103630323A (en) * | 2013-05-22 | 2014-03-12 | 河南科技学院 | Digitized wheat lodging-resistant experiment wind tunnel |
| CN104316286A (en) * | 2014-08-26 | 2015-01-28 | 中国直升机设计研究所 | Low-turbulence design method of rotor wing pneumatic testing stand |
| CN105092202A (en) * | 2014-05-13 | 2015-11-25 | 茹履京 | Z-shaped acoustic wind tunnel channel |
| CN109632236A (en) * | 2018-11-28 | 2019-04-16 | 中国辐射防护研究院 | The sampling of synchronised automatic flow field and measuring system and method in a kind of environmental wind tunnel |
| CN109653964A (en) * | 2019-02-28 | 2019-04-19 | 沈阳航空航天大学 | A kind of wind energy conversion system aerodynamic experiment blockage correction method |
| CN110044573A (en) * | 2019-04-12 | 2019-07-23 | 沈阳航空航天大学 | A kind of opening and closing dual-purpose type low speed reflux wind-tunnel |
-
2008
- 2008-09-27 CN CNU2008202182470U patent/CN201259461Y/en not_active Expired - Fee Related
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102192828B (en) * | 2010-03-02 | 2013-07-24 | 中国科学院理化技术研究所 | Low temperature wind tunnel |
| CN102192828A (en) * | 2010-03-02 | 2011-09-21 | 中国科学院理化技术研究所 | Low temperature wind tunnel |
| CN102323037A (en) * | 2011-05-19 | 2012-01-18 | 中国科学院寒区旱区环境与工程研究所 | Movable and portable wind erosion tunnel |
| CN102407947A (en) * | 2011-08-15 | 2012-04-11 | 中国科学院力学研究所 | Shock tunnel detonation double-driving method and device |
| CN102407947B (en) * | 2011-08-15 | 2013-12-04 | 中国科学院力学研究所 | Shock tunnel detonation double-driving method and device |
| CN102435412A (en) * | 2011-12-10 | 2012-05-02 | 常州晟宇车辆部件厂 | Wind tunnel test device |
| CN103149007B (en) * | 2013-01-29 | 2015-08-12 | 中国科学院力学研究所 | A kind of detonation driven shock tunnel shaping membrane |
| CN103149007A (en) * | 2013-01-29 | 2013-06-12 | 中国科学院力学研究所 | Detonation drive shock tunnel forming membrane |
| CN103630323A (en) * | 2013-05-22 | 2014-03-12 | 河南科技学院 | Digitized wheat lodging-resistant experiment wind tunnel |
| CN105092202B (en) * | 2014-05-13 | 2018-09-21 | 茹履京 | A kind of acoustic wind tunnel runner of Z-shaped arrangement |
| CN105092202A (en) * | 2014-05-13 | 2015-11-25 | 茹履京 | Z-shaped acoustic wind tunnel channel |
| CN104316286B (en) * | 2014-08-26 | 2018-04-27 | 中国直升机设计研究所 | A kind of rotor aerodynamic testing platform low turbulence design method |
| CN104316286A (en) * | 2014-08-26 | 2015-01-28 | 中国直升机设计研究所 | Low-turbulence design method of rotor wing pneumatic testing stand |
| CN109632236A (en) * | 2018-11-28 | 2019-04-16 | 中国辐射防护研究院 | The sampling of synchronised automatic flow field and measuring system and method in a kind of environmental wind tunnel |
| CN109653964A (en) * | 2019-02-28 | 2019-04-19 | 沈阳航空航天大学 | A kind of wind energy conversion system aerodynamic experiment blockage correction method |
| CN110044573A (en) * | 2019-04-12 | 2019-07-23 | 沈阳航空航天大学 | A kind of opening and closing dual-purpose type low speed reflux wind-tunnel |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090617 Termination date: 20091027 |