CN209485652U - A kind of direct current suction gust wind tunnel with bypass - Google Patents
A kind of direct current suction gust wind tunnel with bypass Download PDFInfo
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- CN209485652U CN209485652U CN201920374893.4U CN201920374893U CN209485652U CN 209485652 U CN209485652 U CN 209485652U CN 201920374893 U CN201920374893 U CN 201920374893U CN 209485652 U CN209485652 U CN 209485652U
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- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The utility model discloses a kind of direct current suction gust wind tunnel with bypass, wherein bypass channel is divided to two kinds, it is a kind of for the throttle valve type with moving vane, another kind is that the rotation with arc-like sheet is shut off gate-type, technical points are to simultaneously close off when shunting door with switching door, and wind-tunnel is direct current suction wind-tunnel at this time.It is opened simultaneously when shunting door with switching door, and when throttle valve with moving vane or rotation gate throttle operation, the fraction that original flows through test section, which is bypassed corridor diversion, directly to be skipped test section and flows directly into the external world through outlet section to diffuser, so that the air velocity of test section generates height and changes, fitful wind is generated.Simultaneously by adjusting the folding frequency of throttle valve moving vane or adjusting the rotation speed of rotation closure gate, reach the speed for changing the variation of the fitful wind in test section.Using the gust wind tunnel of the utility model, the fitful wind similar with nature wind can produce.
Description
Technical field
The utility model relates to a kind of gust of property wind wind tunnel experiment device, more specifically, it relates to a kind of with bypass
Direct current suction gust wind tunnel.
Background technique
Wind-tunnel is briefly exactly an elongated pipeline Jing Guo special designing, by dynamical system (motor and fan)
The flowing of air when object moves in air can be simulated with it taking human as the air-flow freely controlled by generating one inside it
The case where phenomenon, object receiving force, air are around the existing around the aerial migration of flow phenomenon and flue gas, diffusion of certain fixed objects
As etc. ".
Air pollution, also known as atmosphere pollution, according to the definition of International Organization for standardization (ISO), air pollution is usually
Refer to since mankind's activity or natural process cause Cucumber to enter in atmosphere, enough concentration is showed, when reaching enough
Between, and the phenomenon that therefore compromise the comfortable of human body, health and wellbeing or environment.Why increasingly environmental wind tunnel experimental method
It is concerned by people, is to be able to solve the problem of other methods cann't be solved since it is with some unique functions.
In Pollution Study, the factor of discovery influence air pollution is more, other than pollution sources factor, also by landform
Geomorphic factors influence.The contaminated range of plains region and the contaminated range in mountain area are significantly different；Climatic factor such as wind direction, wind
Speed, turbulent extent, humidity etc..In addition, since there are complicated inherences to lead connection for these factors, also become time factor
It is more important, as the atmosphere pollution character of winter and summer have apparent difference.For being engaged in the work of atmosphere pollution research
For person, the social environmental factor of research area is also a problem, such as traffic, what optimal sampled point staff did not went
Situation frequently encounters etc..All of these factors taken together usually influences experimental precision and experiment progress, brings biggish material resources and wealth
Power loss, these are all obvious to all.Lift a simply example, season meteorological detection in 15 days by a definite date and 8 monitoring samplings
The background survey of point, field test expense are up to 30,000 yuan or so.If it is more detailed research experiment is carried out, such as now
The research of field release tracer and atmospheric flow field research, expense will be up to hundreds of thousands of members or even members up to a million.
Using atmospheric boundary layer environmental wind tunnel laboratory facilities, the above problem will obtain different degrees of solution.As previously described,
The simulated conditions of atmospheric boundary layer environmental wind tunnel can have repeatability for the environmental condition studied taking human as control and variation
Ability.That is the factor such as time, weather, traffic etc. for influencing field experiment will no longer interfere wind tunnel simulation experiment.And
Human and material resources consumed by testing and financial resources have all obtained largely saving.
It sums up, atmospheric boundary layer environmental wind tunnel can be the work service of two aspects；One, from environmental protection pipe
Reason angle sees that it can be the planning design work service of the industrial and mining enterprises such as plant site selection, total figure arrangement: or emphasis is dirty
The determination work service of the sanitary protection zone (SPZ) in dye source；Field measurement work is replaced in the small scale of complicated landform (being less than 10km) range
Make, is the evaluation and prediction work service of atmosphere quality；In addition, it can be for the arrangement of field measurement, sampled point really
Fixed work provides reference, calculates work for numerical value and provides reference data.Secondly from the research angle of atmosphere pollution mechanism
It sees, it can carry out the influence research of landform, atural object, local flow field and DIFFUSION IN TURBULENCE rule to atmosphere pollution, carry out different dirts
The work services such as research of plume rise rule under the conditions of dye object conditions of discharge and environmental background.
However, when occupying leading role for some extreme weather event (Gust front, hurricane etc.) unstable state air-flows,
Normal atmospheric boundary layer environmental wind tunnel lacks the ability for simulating these event transient effects.Battle array can be generated therefore, it is necessary to a kind of
The atmospheric boundary layer environmental wind tunnel of wind effect.
In order to make the air-flow in wind tunnel experiment generate battle array effect, traditional method, such as the used mechanical swing of forefathers
Grid or airfoil bodies have a disadvantage, and atmospheric boundary layer environmental wind tunnel is that wedge and coarse is added in the well-proportioned wind-tunnel in flow field
Member carrys out the Wind outline of simulation of atmospheric boundary layer, if adding a grid, the wind speed and turbulent flow of experimental section again on this basis
Degree will be difficult to control, so that the wind speed size of experimental section is all unable to control.It is generated using Frequency Converter Control rotation speed of the fan is changed
Battle array property, needs fan to be unable to reach the optimum condition of operating, and require electrical power required for sudden change.Simultaneously because power
Being relatively large in diameter for the fan of section, usually has several meters long, it means that the rotary inertia of fan is very big, so the revolving speed tune of fan
It is whole slow, so that generating velocity variations required time scale (changing the 25% of test section speed in 1~5s) can not
It is able to achieve.And the rate that wind speed in natural environment changes all be it is instantaneous, therefore, current wind-tunnel can not simulate completely to be come from
Right wind.
About the turbulent flow in atmosphere, it is necessary first to know some relationships: the general scale of turbulence is bigger, then the frequency of turbulent flow
It is lower；The scale of turbulence that the bigger barrier of scale generates is bigger.Normal atmospheric boundary layer environmental wind tunnel is by wedge and slightly
The scale of the turbulent flow that rough member generates, wedge and roughness element is generally in 0.1m or so, so the tumbling frequency generated is relatively high.And it is real
Because there is the presence of the biggish barrier of the scales such as high buildings and large mansions, hillside, the woods in the atmosphere of border, low frequency part in turbulent flow
Energy can not be ignored, and scale is larger, the lower fluctuating wind of frequency it is therefore necessary to generating in wind-tunnel, in this way can be with true
Atmospheric boundary layer ring wind environment it is more identical.
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 it needs in wind-tunnel
Wind speed is simulated when experiment close to zero and the stable meteorological condition of wind environment.Direct current blow formula it is unsuitable main reason is that
Its power section is located at test section upstream, and gap of the blower fan when slowly running between multiple-blade is bigger to generate fixed frequency
Battle array property effect, while wind can generate multidirectional sinuous flow when spreading downwards by power section and cause wind environment unstable.Reflux
Formula wind-tunnel can not be discharged into experimental ring after pollution sources release since the characteristic of its silent reflux causes when carrying out pollutant experiment
Overseas, so that the background concentration of test section is constantly superimposed increases, the measurement of experiment is hindered.
Utility model content
In view of the deficienciess of the prior art, the utility model provides a kind of direct current suction gust wind tunnel with bypass,
, with the natural wind in simulating natural environment, can generate frequency has height to have low fitful wind for it.
To achieve the above object, the utility model provides following technical solution:
Direct current suction gust wind tunnel with bypass, including outlet section, power section, diffuser, test section, contraction section and steady
Determine section, described power section one end connects the outlet section communicated with the outside world, and the power section other end is connected to diffuser, test section one end
It is connect with diffuser, the other end is connect with contraction section, and contraction section side is connected to stable section, and the other side of stable section is connected to two
One end of road damping screen, damping screen is connected with honeycomb, and honeycomb is in communication with the outside, it is characterised in that: it is logical to be additionally provided with bypass
Road, wherein bypass channel one end connect the other end with diffuser and connect with contraction section.
Further, the junction of the bypass channel and diffuser is provided with switching door, bypass channel and contraction section
Junction is provided with shunting door.
Further, throttle valve is provided in the bypass channel, the control mode of the throttle valve includes: that regulation is hydraulic
Oil pressure and then drive in system are connected to the mechanical movement of the mechanical linkage of the throttle valve, realize and control the throttle valve
Opening and closing.
Further, the throttle valve includes several moving vanes and fixed pod, wherein fixed pod is fixed
It is arranged in bypass channel, and is connected with moving vane on each fixed pod, two neighboring fixed pod
On moving vane can pass through folding influence bypass channel in air-flow flux.
Further, rotation closure gate is provided in the bypass channel.
Further, the rotation closure gate includes rotary shaft and arc-like sheet, rotary shaft (218) axial direction and bypass channel
In wind direction it is vertical, arc-like sheet be fixedly connected with rotary shaft and can with rotary shaft rotate and rotate, pass through control arc-like sheet
In the size of bypass channel inner barrier, to control the air-flow flux in bypass channel.
Further, the rotary shaft is connected with cogged motor, by motor drive rotary shaft rotation to
Realize opening and closing of the control rotation closure gate in bypass channel.
Further, when shunting door and switching door is closed, bypass channel is out of service；When shunting door and switching door are opened
When, bypass channel brings into operation.
Further, the power section is additionally provided with sequentially connected rear end fan shroud, spin-ended, fan and front end blower
Cover, and rear end fan shroud is towards outlet section, front end fan shroud is towards diffuser.
Further, the outlet section, power section, diffuser, test section, bypass channel, contraction section, stable section, shunting
Door and switching door are full steel structure.
In conclusion the utility model has the following beneficial effects:
1, the mode that gust wind tunnel chooses direct current suction is more advantageous to accurate simulating pollution object diffusion, and reason is to move
The downstream that power section is placed on test section becomes direct current suction and the air-flow of test section is made to be negative pressure, and passively downstream outlet section is discharged,
It can be effectively reduced fan and rotate the unstable interference generated to test section flow field, pollutant will not be right after outlet drain
Test section measurement data has an impact；
2, the bypass channel of this utility model, bypass channel are the parts that gust wind tunnel is most innovated.Most of wind-tunnel, gas
Flow velocity degree is changed by adjusting the revolution of fan, this keeps the change of test section speed slow.However it is other by adjusting
Throttle valve in paths either rotates gate throttle, and almost moment changes air velocity in test section and forms wind speed size variation
Fitful wind, can more accurately simulate natural wind in real atmosphere boundary layer, such flow simulating rheonomous is non-
Often important, it opens frontier, provides testing machine meeting for the aerodynamic research of unsteady flow.
By controlling the shunt volume in the channel, velocity variable in master trip section is made to be in reasonable range always.Bypass
Channel is designed as two rectangular channels, stringent limitation of the size in the two channels by building size.In given space
They are inside designed big as far as possible.The two bypass channels are parallel with main channel outside fan, optimal bypass channel
Area, which is computed, is slightly less than master trip section area and best in certain numberical range.Secondly, bypass channel and attached
Transformation segment must make the air-flow inhomogeneities generated in wind-tunnel main channel minimum.
3, when switching door and shunt door and open simultaneously, bypass channel is access, and moving vane does open and close movement, air quantity it is big
The small movement with moving vane constantly changes, and forms the gust wind tunnel for having battle array effect.When switching door and shunting door are same
When be closed, bypass channel be it is closed circuit, moving vane closure stops working, and gust wind tunnel is converted to conventional permanent wind speed direct current suction
Wind-tunnel.This just makes the design can be realized the dual-purpose effect of gust wind tunnel and conventional wind-tunnel, in actual use can be according to examination
It tests demand voluntarily to switch, reaches multiduty purpose.
Detailed description of the invention
Construction of wind tunnel schematic diagram when Fig. 1 is wind tunnel operation in the utility model embodiment 1；
Each component locations schematic diagram of power section when Fig. 2 is wind tunnel operation in the utility model embodiment 1；
Each component locations schematic diagram of throttle valve when Fig. 3 is bypass channel air-flow flux minimum in the utility model embodiment 1；
Each component locations schematic diagram of throttle valve when Fig. 4 is bypass channel air-flow flux maximum in the utility model embodiment 1；
Closure gate position view is rotated when Fig. 5 is wind tunnel operation in the utility model embodiment 2；
Rotation each component locations of closure gate show when Fig. 6 is bypass channel air-flow flux minimum in the utility model embodiment 2
It is intended to；
Rotation each component locations of closure gate show when Fig. 7 is bypass channel air-flow flux maximum in the utility model embodiment 2
It is intended to；
Fig. 8 is natural wind, conventional wind-tunnel, gust wind tunnel wind speed variation comparison diagram；
Fig. 9 is that gust wind tunnel simulates light air and wind, high wind wind speed change schematic diagram；
Figure 10 is that moving vane opens and closes one of variation schematic diagram of wind speed caused by amplitude mechanical periodicity；
Figure 11 is that moving vane opens and closes wind speed caused by amplitude mechanical periodicity changes schematic diagram two.
In figure: 101, stable section；102, contraction section；103, test section；104, diffuser；105, power section；106, it exports
Section；109, fan；110, rear end fan shroud；111, front end fan shroud；112, spin-ended；114, door is shunted；115, bypass channel；
116, throttle valve；117, switching door；118, fixed pod；119, moving vane；120, honeycomb；121, damping screen；216,
Rotate closure gate；218, rotary shaft；219, arc-like sheet.
Specific embodiment
The utility model is described in further detail below in conjunction with attached drawing.
Embodiment 1:
The utility model embodiment proposes a kind of direct current suction gust wind tunnel with bypass, to realize that generating frequency has height
There is low fitful wind.At runtime, blower drives fan to the suction direct current gust wind tunnel of the utility model embodiment as shown in Figure 1
109 rotations are able to generate air-flow, air-flow along primary passageway stream through at contraction section 102 and 115 intercommunication of bypass channel when, hydraulic system
It is controlled by linkage mechanism and shunts the opening of door 114 so that the fraction of main channel generated after the movement of 101 blower of power section
Inspiration bypass channel 115 under the influence of suction.The same folding by moving vane 119 in throttle valve 116 in bypass channel 115
The diffuser with 115 intercommunication of bypass channel is entered after so that air-flow flux in bypass channel is generated variation by switching door 117
104, and then flow through the throughput moment in test section 103 and change, form the fitful wind of wind speed size variation.It is counted when passing through
The folding speed of moving vane 119 can generate frequency in test section 103 in calculation machine adjustment throttle valve 116 has height to change
Fitful wind.In addition, air-flow does not enter back into bypass channel 115 when shunting door 114 and the closing of switching door 117.Gust wind tunnel conversion
At conventional permanent wind speed direct current suction wind-tunnel.
In conclusion the utility model realizes shunting effect by adding bypass channel 115, so that in the test section of main channel
Wind speed size change, further recycle in bypass channel 115 119 movement velocity of moving vane in throttle valve 116
Adjusting generation frequency has height to have low fitful wind.Correspondingly, when closing shunting door 114 and switching door 117, gust wind tunnel becomes conventional fixed
Normal wind speed direct current suction wind-tunnel is transformed into conventional wind using its internal structure design and then by air-flow.
As shown in Fig. 2, direct current suction gust wind tunnel of the utility model with bypass, bypass channel 115 includes by opening and closing
Door 117, shunts door 114 at throttle valve 116.The junction that door 114 is located at diffuser 104 and bypass channel 115 is shunted, shunting is worked as
When door 114 and switching door 117 are closed, bypass channel 115 is out of service, and throttle valve 116 is closed, and battle array wind becomes conventional wind.
When shunting door 114 and switching door 117 is opened simultaneously, 115 open running of bypass channel, throttle valve 116 is opened, such as
Shown in Fig. 4；105 blower of power section drives fan 109 to provide endlessly wind-force and flows to throttle valve 116.Throttle valve 116 works
When, moving vane 119 is moved therewith in open and close movement state, just can control the throughput for being diverted into bypass channel, thus trying
It tests in section 103 and generates fitful wind.It can be generated in test section 103 after the folding speed of moving vane 119 carries out speed variation
Frequency has the high fitful wind for having low variation.Air-flow continuously enters diffuser 104 by bypass channel 115.It is saved by control
The folding speed of the moving vane 119 on valve 116 is flowed to control a gust size for property wind period of change.
The present embodiment part dimension is as follows: overall length 53m, test section 103:2.5m*2m*16m (length), power section
The diameter of 105: φ 5.1m*9.1m (length), bypass channel 115:2m*4.5m*15m (length), fan 109 blade tip to blade tip is
5.07m, hub diameter 2.65m.
It is further designed in the present embodiment when bypass channel 115 is access, moving vane 119 opens, when bypass is logical
When road 115 is closed circuit, moving vane 119 is out of service.Air volume constantly becomes with the swing of moving vane 119
Change.
Corresponding fan 109 is further designed in the present embodiment by the alternating current of 400kW ac variable frequency speed regulation three-phase 380V
Machine driving.
It is further designed to corresponding switching door 117 in the present embodiment and shunts the position of door 114, is additionally provided with positioning and locking
Device.
The position that corresponding switching door 117 and shunting door 114 are further designed in the present embodiment is additionally provided with sealing device.
The outlet section 106, power section 105, diffuser 104, test section 103, side are further designed in the present embodiment
Paths 115,102 stable section 101 of contraction section, switching door 117 and shunting door 114 are full steel structure.
Embodiment 2:
The present embodiment is that the throttle valve 116 in embodiment 1 is substituted for rotation closure gate 216, and rotation closure gate 216 includes
Arc-like sheet 219 and rotary shaft 218.Rotary shaft 218 axial, arc-like sheet 219 and rotary shaft vertical with the wind direction in bypass channel 115
218 are fixedly connected and can rotate and rotate with rotary shaft 218, by control arc-like sheet 219 to 115 inner barrier of bypass channel
Size, to control the air-flow flux in bypass channel 115.Arc-like sheet 219 can be rotated by rotary shaft 218；It is logical
The rotation of control rotary shaft 218 is crossed to drive the rotation of arc-like sheet 219, thus change the size of wind speed in test section 103 to
Form the fitful wind of wind speed size variation.
The principle is as follows: the direct current suction gust wind tunnel of the utility model embodiment as shown in Figure 5 at runtime, blower band
The dynamic rotation of fan 109 is able to generate air-flow, air-flow along primary passageway stream through at contraction section 102 and 115 intercommunication of bypass channel when, liquid
Pressure system is controlled by linkage mechanism shunts the opening of door 114 so that fraction enters bypass channel 115.It is same logical by bypass
Arc-like sheet 219 makes the circulation volume production of air-flow in bypass channel around the rotation of rotary shaft 218 in rotation closure gate 216 in road 115
Changing, and then the air-flow flowed through in bypass channel 115 is formed into fitful wind.In addition, air-flow is without again when shunting the closing of door 114
It is discharged in into bypass channel 115.Gust wind tunnel is converted to conventional permanent wind speed direct current suction wind-tunnel.
When 115 air quantity minimum of bypass channel, the position of arc-like sheet 219 is as shown in fig. 6, work as 115 air quantity of bypass channel most
Big, the position of arc-like sheet 219 is as shown in fig. 7, arc-like sheet 219 is ceaselessly rotated with rotary shaft 218, and arc-like sheet 219 is on side
115 inner barrier area of paths constantly changes to which the ventilation quantity in bypass channel 115 also constantly changes correspondingly.At this point,
Air-flow flows to diffuser 104 through switching door 117.104 side of diffuser is connected with power section 105.Power section 105 includes rear end
Fan shroud 110, spin-ended 112, fan 109 and front end fan shroud 111.Fan 109 is located at the front end of blower.Based on fan 109
Blower cover is divided into front end fan shroud 111 and rear end fan shroud 110 by position and air flow direction.110 outside of rear end fan shroud
It is provided with spin-ended 112.Power section 105 is connect with outlet section 106, and air-flow is discharged.
Axial, the arc-like sheet vertical with the wind direction in bypass channel 115 of rotary shaft 218 is further designed in the present embodiment
219 are fixedly connected with rotary shaft 218 and can rotate and rotate with rotary shaft 218, logical in bypass by control arc-like sheet 219
The size of 115 inner barrier of road, to control the air flow rate in bypass channel 115.
The rotary shaft 218 is further designed in the present embodiment to be connected with cogged motor, is driven by motor
The rotation of rotary shaft 218 controls the movement of the rotation closure gate 216 to realize.
The wind speed of nature increases sometimes, reduces sometimes.Using professional speed instrument we have found that in different time scales
Under, there are different frequencies for the wind speed variation of nature.According to " the 7th part wind direction of QXT51-2007 surface weather observation specification and
Wind observation " regulation, in surface weather observation, the mean wind speed maximum value of any 10min is chosen out of given the period, as
The maximum wind velocity of the time.This " given period " may be day, the moon, ten days etc..Compared with ten days, the observing frequency of day wants high by one
A bit, it fluctuates while meeting is larger.But compared with Wind Engineering field, this time scale is with regard to too long.The Wind Engineering of profession is surveyed
1 second measurement frequency of measuring appratus can achieve thousand times, this has been applied in actual measurement.
The natural wind profile of surface layer be since the eddying motion ground friction of the large scale of atmosphere cooperatively forms,
In order to mainly be realized by putting wedge and roughness element in wind turbine apparatus simulation of atmospheric boundary layer wind field.The master of wedge
Acting on is the vortex that large scale is formed in wind-tunnel, and roughness element is then equivalent to the dietary fibres of actual ground, passes through the method
The mean wind speed and turbulivity section of different landforms feature can be simulated.But as wind engineering test requires to be continuously improved, mould
Type ratio constantly increases, and atmospheric boundary layer wind field is debugged in wind-tunnel and is become increasingly complex.
It is measured by special instrument it can be found that after air-flow passes through wedge and roughness element high frequency waves can be generated in 1s
It is dynamic, this characteristic with the wind in actual environment very close to.But timing is elongated to 10s, 30s, can find natural wind after 1 minute
There is also the period is longer, the biggish battle array size variation of amplitude, this is that current traditional wind-tunnel can not simulate.Its reason is wind
Although the velocity perturbation in 1s of the air-flow in hole is very violent, fluctuated up and down substantially about the known air speed value that power section gives
, the variation of its wind speed can be found after long-time measures averagely less, can not simulate the low-frequency effect of nature fitful wind.For
The fitful wind of nature can be more accurately simulated, we design and utility model gust wind tunnel.The fitful wind of this utility model
Wind-tunnel can not only generate the higher fluctuation of frequency, moreover it is possible to which the fitful wind effect that low frequency variations are generated in period demand compensates for
Conventional wind-tunnel can not simulate the low frequency variations effect of nature fitful wind as shown in Fig. 8.
By actual measurement it is found that gust wind tunnel can be simulated preferably in the battle array simulation to natural wind size variation
Out in its short time low-frequency range transient change effect.By comparison diagram it is found that in 30s gust wind tunnel analog result and nature
Boundary's fitful wind effect is almost the same.The natural wind wind spectrum that this certain comparison diagram is listed is that it changes relatively uniform a part, when
Nature wind speed it is low such as gentle breeze environment when, wind speed size variation is relatively low and mechanical periodicity is slow；When nature wind speed is very high such as
When harsher wind conditions, wind speed size variation is higher and mechanical periodicity is rapid.
It can also be obtained not after being controlled by the speed of service to throttle valve or rotation closure gate in bypass section
Same low-frequency fluctuation, ripple effect can be corresponding with the wind speed of ambient wind velocity different stage.Simultaneously because hydraulic system is living
Plug movement makes the period of motion of connecting rod be intended to sine, therefore sinusoidal by generating test section wind speed after its adjustment throttle valve movement
Variation.
It can be found that measured result is intended to trigonometric function y=Asin (ω x)+b after being measured using air speed measuring apparatus.Its
Middle A is amplitude,ω is the folding frequency for being moving vane in the period, is generated when folding frequency is lower
The wind speed sinusoidal variations period is slower, and the wind speed sinusoidal variations period generated when folding frequency is higher is very fast；vmaxTo be beaten when bypass
Open and when moving vane opens bypass institute through air-flow minimum, and the wind speed when test section air velocity maximum of main channel, vminTo work as
Bypass institute is maximum through throughput when bypass opening and moving vane complete closure, and the wind when test section air velocity minimum of main channel
Speed, b=A+vmin.Its purpose is exactly to pass through gust property wind-tunnel wind more stable in traditional wind-tunnel is formed the instantaneous size variation of wind speed
Fitful wind, closer to the wind formed in outdoor nature.When the folding amplitude f not full scale of moving vane and blade opens
Sinusoidal effect original less than threshold limit value (not opening maximum, do not close minimum) will weaken triangle zig-zag when with closure
Fitful wind.Required waveform can adjust frequencies omega and amplitude f is obtained according to actual tests demand.
The maximum wind velocity of the utility model wind-tunnel is up to 50m/s, this is chosen the common wind speed of surroundings and measures, most
Big wind speed is set as 15m/s, is carrying out experiment supplement in the future for the measurement data of strong wind to violent typhoon.It is limited to control system
Variation prestissimo is variation 10 times per second at present, and faster variation needs from now on to promote equipment performance, as shown in Figure 9.
When the folding amplitude of control throttle valve moving vane, a cycle for moving it is from maximum value is opened to closure
Maximum, second period movement opening time is big secondary big to closure, when being sequentially reduced median of the amplitude to opening and closing, can make test section
The decaying incremental effect that cyclically-varying effect is superimposed its amplitude is specifically shown in Figure 10.
When the folding amplitude of control throttle valve moving vane, a cycle for moving it is from maximum value is opened to closure
Maximum, second period movement, which is opened, is up to closure time greatly, is sequentially reduced closure amplitude, closes until being sequentially increased again after fully closed
It closes amplitude and does cycle movement, test section cyclically-varying effect can be made to be superimposed the decaying incremental effect that it is closed amplitude, similarly
The decaying incremental effect that can must open amplitude is specifically shown in Figure 11.
Claims (10)
1. a kind of direct current suction gust wind tunnel with bypass, including outlet section (106), power section (105), diffuser (104),
Test section (103), contraction section (102) and stable section (101), described power section (105) one end connect the outlet communicated with the outside world
Section (106), power section (105) other end are connected to diffuser (104), and test section (103) one end is connect with diffuser (104),
The other end is connect with contraction section (102), and contraction section (102) side is connected to stable section (101), the other side of stable section (101)
It being connected to twice damping screen (121), one end of damping screen is connected with honeycomb (120), and honeycomb (120) is in communication with the outside,
Be characterized in that: being additionally provided with bypass channel (115), wherein bypass channel (115) one end connect with diffuser (104) other end with
Contraction section (102) connection.
2. the direct current suction gust wind tunnel according to claim 1 with bypass, it is characterised in that: the bypass channel
(115) it is provided with switching door (117) with the junction of diffuser (104), the connection of bypass channel (115) and contraction section (102)
Place, which is provided with, shunts door (114).
3. the direct current suction gust wind tunnel according to claim 2 with bypass, it is characterised in that: the bypass channel
(115) it is provided in throttle valve (116), the control mode of the throttle valve includes: the oil pressure and then band regulated and controled in hydraulic system
The mechanical movement of the dynamic mechanical linkage for being connected to the throttle valve, realizes the opening and closing for controlling the throttle valve.
4. the direct current suction gust wind tunnel according to claim 3 with bypass, it is characterised in that: the throttle valve
It (116) include several moving vanes (119) and fixation pod (118), wherein fixed pod (118) are fixed at side
In paths, and moving vane (119) are connected on each fixed pod (118), two neighboring fixed water conservancy diversion
The moving vane (119) covered on (118) can be by the air-flow flux in folding influence bypass channel (115).
5. the direct current suction gust wind tunnel according to claim 2 with bypass, it is characterised in that: the bypass channel
(115) rotation closure gate (216) is provided in.
6. the direct current suction gust wind tunnel according to claim 5 with bypass, it is characterised in that: the rotation closure gate
It (216) include rotary shaft (218) and arc-like sheet (219), rotary shaft (218) is axial vertical with the wind direction in bypass channel (115),
Arc-like sheet (219) is fixedly connected with rotary shaft (218) and can rotate and rotate with rotary shaft (218), by controlling arc
Piece (219) bypass channel (115) inner barrier size, to control the air-flow flux in bypass channel (115).
7. the direct current suction gust wind tunnel according to claim 6 with bypass, it is characterised in that: the rotary shaft
(218) it is connected with cogged motor, rotary shaft (218) rotation is driven by motor to realize that the control rotation is cut
Flow the opening and closing of door (216) in bypass channel (115).
8. the direct current suction gust wind tunnel according to claim 2 with bypass, it is characterised in that: when shunting door (114)
When closing with switching door (117), bypass channel (115) is out of service；It is other when shunting door (114) and switching door (117) is opened
Paths (115) bring into operation.
9. the direct current suction gust wind tunnel according to claim 1 with bypass, it is characterised in that: the power section
(105) sequentially connected rear end fan shroud (110), spin-ended (112), fan (109) and front end fan shroud are additionally provided with
(111), and rear end fan shroud (110) is towards outlet section (106), and front end fan shroud (111) is towards diffuser (104).
10. according to claim 1 to the direct current suction gust wind tunnel with bypass described in any claim in 9, feature
It is: the outlet section (106), power section (105), diffuser (104), test section (103), bypass channel (115), contraction section
(102), stable section (101), shunting door (114) and switching door (117) are full steel structure.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109799056A (en) * | 2019-03-23 | 2019-05-24 | 国电环境保护研究院有限公司 | A kind of direct current suction gust wind tunnel with bypass |
| CN113959671A (en) * | 2021-10-22 | 2022-01-21 | 中国科学院新疆生态与地理研究所 | But two straight-through closed circulation wind-tunnel laboratories |
-
2019
- 2019-03-23 CN CN201920374893.4U patent/CN209485652U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109799056A (en) * | 2019-03-23 | 2019-05-24 | 国电环境保护研究院有限公司 | A kind of direct current suction gust wind tunnel with bypass |
| CN109799056B (en) * | 2019-03-23 | 2024-02-06 | 国电环境保护研究院有限公司 | Direct current suction type gust wind tunnel with bypass |
| CN113959671A (en) * | 2021-10-22 | 2022-01-21 | 中国科学院新疆生态与地理研究所 | But two straight-through closed circulation wind-tunnel laboratories |
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