CN109799058A - A kind of double test section direct current gust wind tunnels of band bypass - Google Patents
A kind of double test section direct current gust wind tunnels of band bypass Download PDFInfo
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- CN109799058A CN109799058A CN201910224735.5A CN201910224735A CN109799058A CN 109799058 A CN109799058 A CN 109799058A CN 201910224735 A CN201910224735 A CN 201910224735A CN 109799058 A CN109799058 A CN 109799058A
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- 238000012360 testing method Methods 0.000 title claims abstract description 60
- 230000008602 contraction Effects 0.000 claims abstract description 14
- 230000006641 stabilisation Effects 0.000 claims abstract description 7
- 238000011105 stabilization Methods 0.000 claims abstract description 7
- 238000013016 damping Methods 0.000 claims description 10
- 238000009423 ventilation Methods 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 238000004891 communication Methods 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
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- 238000002474 experimental method Methods 0.000 description 7
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- 238000010276 construction Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 4
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- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The invention discloses a kind of double test section direct current gust wind tunnels of band bypass, including sequentially connected stabilization and contraction section, the first test section, interflow section, power section, shunting section, the second test section and outlet section, it is characterized by: also setting up bypass section, bypass section one end is connect with interflow section, and the other end is connect with shunting section.Using gust wind tunnel of the invention, it can be realized and generate low-frequency fitful wind, it can be with the gust effect of wind of natural wind in simulation of atmospheric boundary layer, to study influence of the fitful wind to physical phenomenons various in atmospheric boundary layer, two kinds of tests can be carried out inside a gust wind tunnel, it is more economical and quick and more efficient.
Description
Technical field
The present invention relates to a kind of gust of property wind wind tunnel experiment devices, more specifically, it relates to a kind of double tests of band bypass
Duan Zhiliu gust wind tunnel.
Background technique
Wind-tunnel is briefly exactly an elongated pipeline Jing Guo special designing, is existed by dynamical system (motor and fan)
One flowing that air when object moves in air taking human as the air-flow freely controlled, can be simulated with it of its internal generation shows
As the case where, object receiving force, air around certain fixed objects around flow phenomenon and the aerial migration of flue gas, diffusion phenomena
Deng ".
Boundary layer wind tunnel plays increasingly important role in the research in Wind Engineering field.Boundary layer wind tunnel has mould
The ability of quasi- atmospheric boundary laminar flow can be the Diffusion Law of Pollution Study object and long-span bridge, skyscraper, tower etc.
The safe design research of many other unique textures provides technical support.
However, when occupying leading role for some extreme weather event (Gust front, hurricane etc.) unstable state air-flows,
Common boundaries layer wind-tunnel lacks the ability for simulating these event transient effects.Therefore, it is necessary to a kind of battle array wind effects of capable of generating
Boundary layer wind tunnel.
Turbulent flow in atmosphere, the in general scale of turbulence are bigger, then the frequency of turbulent flow is lower；The bigger obstacle of scale
The scale of turbulence that object generates is bigger.The turbulent flow that normal atmospheric boundary layer wind tunnel is generated by wedge and roughness element, wedge and coarse
The scale of member is generally in 0.1m or so, so the tumbling frequency generated is relatively high.And because having high buildings and large mansions, mountain in real atmosphere
The presence of the biggish barrier of the scales such as slope, the woods, so the energy of low frequency part can not be ignored in turbulent flow, it is therefore necessary to
Generate that scale is larger, the lower fluctuating wind of frequency in wind-tunnel, in this way can be more identical with true atmosphere, here it is our battle arrays
The design sense of wind wind-tunnel.
Currently, mechanical swing mechanism or adjustment wind is usually used in the atmospheric boundary layer wind tunnel that can generate battle array wind effect
Machine revolving speed generates fitful wind.But the fitful wind generated in this way, gust frequency are higher.And in atmospheric boundary layer with
It is low that machine gust velocity generation size variation has height to have, and therefore, current gust wind tunnel can not simulate in atmospheric boundary layer completely
Random fitful wind.
Blowing-type wind-tunnel and suction-type wind-tunnel can be divided into according to the flow direction of air-flow: blowing-type wind-tunnel is blown with blower
Flow media of the air-flow out as wind-tunnel；And suction-type wind-tunnel is then that the low-pressure area to be formed is rotated by fan blade Bigpian, it will be empty
Aspiration enters to form air-flow.Two kinds of wind-tunnel application range is all very wide, but concrete application field is again different.
It is ambient wind velocity close to static or very low meteorological condition that the premise of high pollution is generated in actual environment, because
Only in this environment, the pollutant of discharge cannot be spread apart, and lead to the heavily contaminated in some areas.Therefore direct current need to be used
Suction wind tunnel simulation outlet air quick access is bordering on zero and the stable meteorological condition of wind environment.Direct current blows the unsuitable main cause of formula and exists
It is located at test section upstream in its power section, gap of the blower fan when slowly running between multiple-blade is bigger to generate fixed frequency
Battle array effect, while wind can generate multidirectional sinuous flow and cause wind environment unstable when being spread downwards by power section.It returns
Streaming wind-tunnel can not be discharged into experiment after pollution sources release since the characteristic of its silent reflux causes when carrying out pollutant experiment
Outside environment, increase so that the background concentration of test section is constantly superimposed, hinders the measurement of experiment.And for substances such as sand and dust
When transmission experiment, direct current need to be selected to blow formula wind-tunnel, and gravel can be made to bring power section by air-flow using direct current suction and reverse-flow type
Damage blower.
External individual closed circuit, dual-purpose wind-tunnel of open circuit, structure is more complicated, and operation is very difficult, and can not generate a gust property effect
Fruit is not used in heavy construction application class wind-tunnel.A general wind-tunnel is only used for a kind of test, and wind-tunnel involves great expense not
It says, and inefficient, the present invention provides a kind of double test gust wind tunnel devices, can be to carry out two tests, pole in a wind-tunnel
Big has saved cost, improves efficiency.
Summary of the invention
In view of the deficiencies of the prior art, the present invention intends to provide a kind of double test section direct current battle arrays of band bypass
Wind wind-tunnel has the advantage that wind-tunnel inner fluid speed and wind turbine apparatus two kinds of test of progress are controlled by bypass section.
To achieve the above object, the present invention provides the following technical scheme that
A kind of double test section direct current gust wind tunnels of band bypass, including sequentially connected stabilization and contraction section, the first test
Section, interflow section, power section, shunting section, the second test section and outlet section, it is characterised in that: also set up bypass section, bypass section one
End is connect with interflow section, and the other end is connect with shunting section.
Further, damping screen and honeycomb are provided in shunting section.
Further, bypass section includes flow deflector, preceding round corner section, throttle valve, rear round corner section and hydraulic shunting door.
Further, it is provided with flow deflector in preceding round corner section and rear round corner section, rear round corner section is set with shunting section junction
It is equipped with hydraulic shunting door.
Further, hydraulic shunting door is controlled by hydraulic device, and when hydraulic shunting door is closed, bypass section is out of service,
When hydraulic shunting door is opened, it is located at the throttle valve in bypass section and between preceding round corner section and rear round corner section and opens, bypass
Section brings into operation.
Further, throttle valve includes several moving vanes and fixed pod, wherein fixed pod fixed setting
It is flexibly connected in bypass section, and on each fixed pod there are two moving vane, on two neighboring fixed pod
Moving vane can pass through folding influence bypass section in ventilation speed.
Further, power section is additionally provided with sequentially connected rear end pod, spin-ended, fan and front end radome fairing,
And rear end pod and front end radome fairing are respectively facing outlet section and interflow section.
Further, stablize and be in communication with the outside with contraction section by the damping screen and honeycomb that its end is arranged in.
Further, stablize and be with contraction section, the first test section, interflow section, power section, bypass section and the second test section
Full steel structure.
In conclusion the invention has the following advantages:
1. double test section direct current gust wind tunnels with bypass of the invention, the wind-tunnel can be realized in large tunnel to atmosphere
The simulation of different Wind Engineering projects (such as wind pressure wind shake, wind environment, air pollution, mass transfer) in boundary layer, without carrying on a shoulder pole
Background concentration caused by the cumulative effect of heart tracer increases, and influences the accuracy of simulated experiment, is beneficial to Practical Project and answers
With.
2. the device when test section is run, can be obtained compared with high air velocity with lower-wattage, be used for simulated atmosphere boundary
Various wind scorpions caused by being flowed in layer by air；It can be spread with the pollutant in simulation of atmospheric boundary layer, to avoid closing
Tracer background concentration constantly increases the drawbacks of bring simulated experiment error constantly increases when road transport row.
3. the device can also be by controlling the opening and closing of hydraulic shunting door and bypassing the opening and closing reality of throttle blade in section
The adjusting of existing internal wind speed is, it can be achieved that various wind scorpions caused by low wind speed in simulation of atmospheric boundary layer.
4. two kinds of tests can be carried out inside a gust wind tunnel, it is more economical and quick and more efficient.
5. almost moment changes air velocity shape in test section by adjusting throttle valve and fan group in bypass channel
At the fitful wind of wind speed size variation, natural wind in real atmosphere boundary layer can be more accurately simulated, it is such non-steady
Permanent flow simulating is extremely important, it opens frontier, provides testing machine for the aerodynamic research of unsteady flow
Meeting.
6. making velocity variable in master trip section be in reasonable range always by the shunt volume for controlling the channel.It is other
Paths are designed as two rectangular channels, stringent limitation of the size in the two channels by building size.In given sky
It is interior that they are designed big as far as possible.The two bypass channels are parallel with main channel outside fan.Secondly, bypass is logical
Road and attached transformation segment must make the air-flow inhomogeneities generated in wind-tunnel main channel minimum.
Detailed description of the invention
Fig. 1 is each modular construction schematic diagram of wind-tunnel；
Fig. 2 is bypass each modular construction schematic diagram of section；
Round corner section structural schematic diagram after when Fig. 3 is hydraulic shunting door closure；
Round corner section structural schematic diagram after when Fig. 4 is the unlatching of hydraulic shunting door；
Fig. 5 is throttle-valve structure schematic diagram when moving vane opens；
Fig. 6 is throttle-valve structure schematic diagram when moving vane is closed；
Fig. 7 is the construction of wind tunnel schematic diagram with exhaust fan unit；
Fig. 8 is the schematic cross-section of exhaust fan unit.
In figure: 101, stable and contraction section；103, the first test section；105, collaborate section；106, power section；107, it exports
Section；109, fan；110, front end radome fairing；111, rear end pod；112, spin-ended；116, honeycomb；117, damping screen；
204, shunting section；205, rear round corner section；206, hydraulic shunting door；207, the second test section；209, preceding round corner section；210, water conservancy diversion
Piece；213, throttle valve；214, section is bypassed；215, exhaust fan unit；218, fixed pod；219, moving vane；220, hydraulic dress
It sets.
Specific embodiment
Below in conjunction with attached drawing, invention is further described in detail.
A kind of double test section direct current gust wind tunnels of band bypass, including sequentially connected stabilization and contraction section 101, first try
Test section 103, interflow section 105, power section 106, shunting section 204, the second test section 207 and outlet section 107, it is characterised in that: also
Setting bypass section 214, bypass 214 one end of section are connect with interflow section 105, and the other end is connect with shunting section 204.Double examinations with bypass
Test a section direct current gust wind tunnel overall length 110m (double test sections), test section (1) 2.5m*2m*16m (length), test section (2)
2.5m*2m*16m (length), power section φ 5.1m*9.1m (length) are bypassed section 1.7m*4.5m*15m (length).
As shown in Figure 1, power section 106 is to install one section of hole body of driving fan 109, power section 106 is rectified including front end
Cover 110, fan 109, spin-ended 112, rear end pod 111.Blower drives the rotation of fan 109 to be able to generate gas flowing, builds
Erect flow field stable in test section.Air-flow flows through stable with contraction section 101, direction and speed due to air-flow along air inlet
All be it is non-uniform, the rapid degree of air-flow is also relatively high, or even there is also the whirlpools of large scale in the gas flow, thus
The fairings such as honeycomb 116, damping screen 117 are provided in the stabilization and contraction section 101 of air-flow.Honeycomb 116 and damping screen
117 effect is to become air-flow uniformly, and rapid degree substantially reduces, and guarantees the flow quality of the first test section 103.Stablize with
The air-flow that the design smaller than entrance with the radius of curvature of 103 junction of the first test section of contraction section 101 makes uniformly is accelerated, gas
When stream is along the stable flowing with contraction section 101, Dong Bishang is not separated.Collaborate section by the air flow direction of the first test section 103
105, interflow its effect of section 105 is that the kinetic energy of air-flow is changed into pressure energy, to reduce the power loss of wind-tunnel.Finally, air-flow
It is flowed out through the second test section 207 from outlet section 107.
As shown in Figure 2, Figure 3 and Figure 4, bypass section 214 include rear round corner section 205, hydraulic shunting door 206, flow deflector 210,
Preceding round corner section 209 and throttle valve 213.Round corner section 205 is connect with shunting section 204 after wherein, and junction is provided with hydraulic shunting door
206, hydraulic shunting door 206 is driven by hydraulic device 220, and the preceding round corner section 209 of bypass section 214 is connect with contraction section 102.Work as liquid
When pressure shunts the closing of door 206, bypass section 214 is closed.When hydraulic shunting door 206 is opened, bypass section 214 is opened, and air-flow is from liquid
Pressure shunts door 206 into round corner section 205 flows to throttle valve 213 after.In turning, due to the turning of air-flow, occur from curvature
Center is to the centrifugal force of pipe outer wall, this allows for air-flow in turning, and the pressure of outer wall increases and the pressure reduction of inner wall.So
Air-flow velocity at outer wall will reduce, and its flow velocity will increase accordingly at inner wall, therefore occur diffusion effect near outer wall
It answers, and blockage effect is then occurring at inner wall.Air-flow has opposite phenomenon to generate after turning, i.e., near inner wall
Diffusion effect is generated, blockage effect is generated near outer wall.Diffusion effect leads to flow shedding inside and outside wall.Therefore air-flow is at turning
It is easy to generate separation and convection current occurs, air-flow separates in order to prevent, improves the flowing of air-flow and reduces loss, in corner
Design has flow deflector 210.
Throttle valve 213 includes fixed pod 218 and moving vane 219.It wherein fixes pod 218 and is fixed at side
In section 214, and moving vane 219 is connected on each fixed pod 218, two neighboring fixed pod
Moving vane 219 on 218 can influence the ventilation speed in bypass section 214 by folding.When as shown in Figure 5, when movable leaf
Piece 219 opens, minimum by the flow velocity of throttle valve 213 to fluid obstacle maximum.As shown in fig. 6, moving vane 219 is closed, it is right
Fluid obstacle is minimum, maximum by the flow velocity of throttle valve 213.By controlling the folding of moving vane 219 to control bypass section
214 ventilation speed, and then control the frequency of the ventilation speed in two test sections and wind speed variation.
Twice damping screen 117 is additionally provided with inside shunting section 204, the side of damping screen 117 is connected with honeycomb 116.It is logical
The effect for crossing honeycomb 116 and damping screen 117 makes air-flow become uniform.To smoothly flow to the second test section 207.
When test, air-flow is flowed into from air inlet, makes air-flow become more uniformly, then to pass through stabilization by honeycomb 116
Air velocity is improved with contraction section 101, enters the first test section 103 later, through collaborating section 105 after air-flow passes through test section
Shunting section 204 is reached, a part of wind enters bypass section 214 (opening of hydraulic shunting door 206), through the bypass flow direction of section 214 interflow section
105, and the second test section 207 is eventually flowed to, outlet section 107 is flowed to by the second test section 207.
As shown in Figure 7 and Figure 8, it bypasses in the pipeline of section 214 and is additionally provided with several exhaust fan units 215, it can same time control
System: the rotation speed by controlling exhaust fan unit makes the throughput of test section obtain the change of height frequency.It can also be successively
Control: the case where each row by controlling exhaust fan unit is run.The is successively run after the exhaust fan unit operation of the first row starts
Two rows, the third line until all exhaust fan units be all turned on, make bypass section 214 in air quantity be gradually increased, improve back-flow velocity
And then influence the wind speed in each test section.Speed is when running how much variations of quantity by exhaust fan unit to change test section battle array
The speed of wind size variation.The control mode of above-mentioned this multiple small fans as shown in the figure is compared to one larger function of exclusive use
For the fan of rate, it is easier to control, and starting and the response speed closed are faster, the change rate of wind speed can achieve higher
Requirement, control precision it is higher.
Claims (9)
1. a kind of double test section direct current gust wind tunnels of band bypass, including sequentially connected stabilization and contraction section (101), the first examination
Section (103), interflow section (105), power section (106), shunting section (204), the second test section (207) and outlet section (107) are tested,
It is characterized by: also setting up bypass section (214), bypass section (214) one end is connect with interflow section (105), the other end and shunting section
(204) it connects.
2. double test section direct current gust wind tunnels of band bypass according to claim 1, it is characterised in that: the shunting section
(204) damping screen (117) and honeycomb (116) are provided in.
3. double test section direct current gust wind tunnels of band bypass according to claim 1, it is characterised in that: the bypass section
It (214) include flow deflector (210), preceding round corner section (209), throttle valve (213), rear round corner section (205) and hydraulic shunting door
(206)。
4. double test section direct current gust wind tunnels of band bypass according to claim 3, it is characterised in that: the preceding round corner section
(209) and in rear round corner section (205) it is provided with flow deflector (210), rear round corner section (205) sets with shunting section (204) junction
It is equipped with hydraulic shunting door (206).
5. double test section direct current gust wind tunnels of band bypass according to claim 4, it is characterised in that: hydraulic shunting door
(206) it is controlled by hydraulic device (220), when hydraulic shunting door (206) are closed, bypass section (214) is out of service, works as hydraulic separate
Flow door (206) open when, be located at bypass section (214) in and the throttling between preceding round corner section (209) and rear round corner section (205)
Valve (213) is opened, and bypass section (214) brings into operation.
6. double test section direct current gust wind tunnels of band bypass according to claim 5, it is characterised in that: the throttle valve
It (213) include several moving vanes (219) and fixation pod (218), wherein fixed pod (218) are fixed at side
It is two neighboring solid there are two being flexibly connected in section (214), and on each fixed pod (218) moving vane (219)
Determining the moving vane (219) on pod (218) can influence to bypass the ventilation speed in section (214) by folding.
7. double test section direct current gust wind tunnels of band bypass according to claim 1, it is characterised in that: the power section
(106) sequentially connected rear end pod (111), spin-ended (112), fan (109) and front end radome fairing are additionally provided with
(110), and rear end pod (111) and front end radome fairing (110) are respectively facing outlet section (107) and interflow section (105).
8. double test section direct current gust wind tunnels of band bypass according to claim 1, it is characterised in that: stable and contraction section
(101) it is in communication with the outside by damping screen (117) and honeycomb (116) that its end is arranged in.
9. double test section direct current gust wind tunnels of band bypass according to claim 1, it is characterised in that: the stabilization and receipts
Contracting section (101), the first test section (103), interflow section (105), power section (106), bypass section (214) and the second test section
It (207) is full steel structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910224735.5A CN109799058B (en) | 2019-03-24 | 2019-03-24 | Double-test-section direct-current wind-gusting wind tunnel with bypass |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910224735.5A CN109799058B (en) | 2019-03-24 | 2019-03-24 | Double-test-section direct-current wind-gusting wind tunnel with bypass |
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| CN109799058B CN109799058B (en) | 2024-02-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112644741A (en) * | 2020-12-30 | 2021-04-13 | 哈尔滨工业大学 | Low-voltage low-density Mars dust storm environment simulation device and method thereof |
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2019
- 2019-03-24 CN CN201910224735.5A patent/CN109799058B/en active Active
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| US5435175A (en) * | 1991-11-29 | 1995-07-25 | Mercedes Benz Ag | Wind tunnel having a free jet test section for simulating wind direction fluctuations |
| DE10163896A1 (en) * | 2001-12-22 | 2003-07-17 | Daimler Chrysler Ag | Wind tunnel jet has a boundary layer separation device that prevents flow separation and enables stable flow to be achieved with a smaller flow development length |
| WO2009037917A1 (en) * | 2007-09-20 | 2009-03-26 | Mitsubishi Heavy Industries, Ltd. | Measuring area of wind-tunnel testing apparatus, and wind-tunnel testing apparatus using the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112644741A (en) * | 2020-12-30 | 2021-04-13 | 哈尔滨工业大学 | Low-voltage low-density Mars dust storm environment simulation device and method thereof |
| CN112644741B (en) * | 2020-12-30 | 2022-09-27 | 哈尔滨工业大学 | Low-voltage low-density Mars dust storm environment simulation device and method thereof |
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| CN109799058B (en) | 2024-02-06 |
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