CN205642792U - A coarse unit for turbulence intensity reinforcing of wind -tunnel bottom - Google Patents

A coarse unit for turbulence intensity reinforcing of wind -tunnel bottom Download PDF

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Publication number
CN205642792U
CN205642792U CN201620302533.XU CN201620302533U CN205642792U CN 205642792 U CN205642792 U CN 205642792U CN 201620302533 U CN201620302533 U CN 201620302533U CN 205642792 U CN205642792 U CN 205642792U
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China
Prior art keywords
wind
tunnel
turbulence intensity
perturbator
box
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CN201620302533.XU
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Chinese (zh)
Inventor
林坤
刘红军
黄勤
管箐
郭开元
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Shenzhen Graduate School Harbin Institute of Technology
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Shenzhen Graduate School Harbin Institute of Technology
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Abstract

The utility model provides a coarse unit for turbulence intensity reinforcing of wind -tunnel bottom calls prisoners in after letting them out for exercise the box by upper portion perturbator and lower part and forms, and the perturbator is connected through the connecting rod and the box of calling prisoners in after letting them out for exercise, two parts about the upper portion perturbator divides, and left side terminal being is lapped, but the right side is angle regulation's grid structure, and the right side end is a square heavy object. The upper portion perturbator can produce more swirls to increase turbulence intensity, do not need outside power input. Because exquisite structural design only leans on the wind energy in the wind -tunnel just can drive, when using, the size that can adjust the heavy object quality satisfies the demand under the different wind speed conditions.

Description

The roughness element that turbulence intensity strengthens bottom wind-tunnel
Technical field
This patent is applied to wind tunnel test field, and application roughness element improves the precision of Boundary layer simulation, particularly to The roughness element that turbulence intensity strengthens bottom wind-tunnel.
Background technology
The building novel along with the development of Building technology, high-rise, large-span structure and some moulding is increasingly chased after by people Hold in both hands.And these structures are the most all the structures that wind is sensitive, the design of building wind load all has to pass through wind tunnel test and determines. The simulation of atmospheric boundary layer is as the important component part of wind tunnel test, and its simulation effect is by the standard determining building wind load Exactness produces strong influence.
The simulation of atmospheric boundary layer, mainly to mean velocity profile, the simulation of near-earth turbulent flow.For such as simulated atmosphere limit This field of interlayer, Present Domestic outer scholar carried out substantial amounts of research and achieved abundant achievement in research, for The simulation of mean velocity profile is the most accurate；And for bottom turbulent flow simulation especially how to increase bottom turbulent flow Intensity, does not the most carry out sufficiently effective research.For building structure, wind load has most the part of break-up value It is exactly turbulent flow and building structure is coupled produced effect.If turbulent flow can accurately be simulated, it will obtain more accurate The wind load response of building structure.
Currently the simulation to atmospheric boundary layer mainly divides actively simulation and passive simulation.Passive simulation, generally uses wedge to add Roughness element or cell structure add the form of roughness element；Actively simulation, main employing oscillating grid structure, rotation wedge add Roughness element is simulated；Roughness element mainly uses cube.This analog form is for the simulation effect of bottom turbulent flow Bad, the especially intensity of turbulent flow.Although using the vibration wedge actively simulated, oscillating grid structure for turbulence intensity Promote, but due to wedge, grid distance test (DT) model farther out, turbulence intensity decayed more before arrival mode, The turbulence intensity causing bottom is the most weak.
Roughness element is owing to very close to BUILDINGS MODELS, the simulation effect for turbulent flow is the most notable.But, traditional roughness element It is all the method using passive simulation, for the enhancing of turbulence intensity inconspicuous.
CN101377447A discloses a kind of rough element apparatus with variable rotary-out type wind tunnel, comprising: multiple roughness element, open Hole flat board, lower flat board (or framework) and four critical pieces of hinge.It is characterized in that: roughness element is shaped as quadrant shell of column, One straight flange of this roughness element is hinged on plate with opening, another straight flange be hinged on be placed under plate with opening parallel with it Lower flat board (or framework) on；Plate with opening fixed installation concordant with wind-tunnel base plate, lower flat board (or framework) is moved to a direction Move and just make roughness element screw out from the upper surface of perforated panel, change the back-out amount of roughness element by changing the amount of movement of lower flat board, Thus change the roughness of whole perforated panel, wind-tunnel can be formed the air-flow near the ground of all kinds of simulation of atmospheric boundary layer.Should Device can realize the step-less adjustment of height of roughness element quickly and easily.
CN204882029U discloses the wind field arrangement of a kind of vast scale and high turbulent flow.It is horizontal that it is included in body ground, hole The several vertical wedge being evenly arranged to interval；One piece of sawtooth baffle plate it is fixed with, in the middle and upper part of wedge in the bottom of wedge It is fixed with another block transverse baffle；Being provided with number row's roughness element between wedge and the rotating disk of test chamber, roughness element is three Plant different size of square, carry out size, dilute close different roughness element layout conversion according to test requirements document；In rotating disk The heart has been positioned vertically above three-dimensional fluctuating wind speed instrument, and three-dimensional fluctuating wind speed instrument is fixed on the cross bar of lifting instrument, three-dimensional pulsation The liftoff 10cm of probe of anemobiagraph, just to carrying out flow path direction, lifting instrument is arranged on a side of hole body；Described three-dimensional pulsation Anemobiagraph is connected with data collecting system.
Known there is problems in that
1. the wedge of passive simulation, cell structure are bad for the simulation effect of bottom turbulence intensity；
2. the vibration wedge of active simulation, oscillating grid structure are due to distance model too far, for the rapids near model part Intensity of flow increases inconspicuous；
The most conventionally employed cubical roughness element is for increasing the poor effect of turbulence intensity.
The most existing active simulation such as vibration wedge etc. needs extra power to input, and builds complex, is not easy to dimension Protect.
Summary of the invention
In view of prior art exist problem, in order to increase the turbulence intensity of wind-tunnel bottom, this utility model provide for The roughness element that bottom wind-tunnel, turbulence intensity strengthens.Frame for movement in roughness element applies disturbance to wind field, can be thick in tradition The turbulence intensity of wind field bottom is further strengthened under rough unit mechanism.This movable roughness element need not the defeated of external energy Enter, only achieve that by the wind energy in wind-tunnel.
Preferably, the purpose of this utility model is achieved in that turbulence intensity increasing bottom wind-tunnel of the present utility model Strong roughness element, it is characterised in that be made up of top perturbator and bottom box of calling prisoners in after letting them out for exercise, perturbator is by connecting rod and calls prisoners in after letting them out for exercise Box connects, and top perturbator divides left and right two parts, and left distal end is cover plate, and right side is the cell structure of adjustable-angle, Right end is a square weight.
Wherein, the most described connecting rod is vertical with box of calling prisoners in after letting them out for exercise to be connected, and its altitude range is 5-10cm.
Further preferably scheme includes two parts about the perturbator point of top, and perturbator swings up and down angular range for ± 40-50 Degree.
Further preferably scheme includes that this weight is a square box, can be filled with counterweight, to regulate disturbance effect in the middle of box.
Further preferably scheme include left distal end cover plate preferably can the cell structure composition of folding, the little luffer boards of left side grid It is about 45 degree with cover plate angle.
Further preferably scheme includes that right cap prelaminar part is cell structure, and the little luffer boards of right side grid and cover plate angle are-45 Degree, and end 2-4cm section does not set cell structure, for closed state.
Further preferably scheme includes that bottom box of calling prisoners in after letting them out for exercise is preferably bullet, concrete size can according to wind-tunnel size modification, The air inlet of bullet is the most square, and the length of side is about 5cm.
Further preferably scheme includes that the concrete size of this bullet air outlet can be according to wind-tunnel size modification, it is ensured that air-out Mouthful the length of side or diameter be at least square orifice that 1/4th of the square air inlet length of side, the preferably length of side are 1.25cm or The circular port of a diameter of 1.25cm.
Wind field can be applied disturbance when top perturbator swings up and down, produce the whirlpool on vertical direction, whirlpool is along with disturbance The motion of device and the turbulent flow with simulation of atmospheric boundary layer that periodically comes off, thus increase wind-tunnel bottom turbulence intensity.
Roughness element of the present utility model need not external energy input, and wind energy just can drive the most close to the inner portion.
This utility model further provides for a kind of method increasing turbulence intensity, and its use is previously described for turbulent flow bottom wind-tunnel Strengthened roughness element.Specifically include:
Wind is blown into from air inlet, and the wind speed that processes through box of calling prisoners in after letting them out for exercise strengthens the wind becoming vertical, same blowing afloat on the right side of perturbator Fall time on the left of, the cover plate that left side falls, cover air inlet and make right side no longer have vertical wind to go out；At right side weight Under drive, the right side cover plate on the left of simultaneously that falls rises, and air inlet continues air intake and forms circulation, to applying in wind field repeatedly to disturb Dynamic, upset to flow turbulence intensity bottom increase.
The probability that perturbator motion is got up is given theories integration by Bernoulli equation:
V 1 × a 2 = V 2 × ( a 4 ) 2 × π ⇒ V 2 = 16 π V 1
V1: wind speed bottom air inlet wind speed both wind-tunnel
V2: air outlet wind speed
A: the air inlet length of side
Can be seen that the wind speed at air outlet is approximately 5.1 times of air inlet, wind velocity lift is clearly.
P 1 = 1 1600 × ( 5.1 V ) 2 × ( a 4 ) 2 × π P 2 = 1 1600 V 2 2 a 2
P1,P2: represent resistance to be overcome during blowing force and the weight-drop in air port respectively
V: wind speed bottom expression
If the satisfied relation once of weight M:
P2<Mg<P1
Ensure that the proper motion of disturbance.
If bottom wind speed is 10m/s, then M span is between 31.37g and 80g；If bottom wind speed is 20m/s, Then M span is between 125.5g and 320g.
Particularly, the motion of roughness element is roughly divided into two states: opening air intake state and falling state of remaining silent.
Opening air intake state:
When cover plate is opened, wind is blown into from air inlet, through calling prisoners in after letting them out for exercise box, due to narrow wall effect wind from air outlet out time wind speed Become big, the right end plate with weight is blown afloat.Additionally, horizontal direction windward also can give one power upwards blown afloat of right plate； And left plate and cover plate, in order to reduce wind resistance, devise cell structure onboard, it is intended to ensure that perturbator moves to The position that need not resistance can let in air, and does not produce resistance.When weight is blown afloat to and is exceeded horizontal level, level to Wind can blow to left plate, wind now can not have been blown at the grid of left side thus moved downward to left plate one Power, is further driven to right side weight and lifts cover plate whereabouts on the left of simultaneously, and the direction of right side grid moves to just can make The position that wind passes through, will not produce the resistance hindering weight to lift.The existence of cell structure, it is ensured that horizontal wind is to perturbator Load be all advantageous for the right side weight to blow afloat.
Remain silent falling state:
When left side cover plate covers air inlet completely, vertical wind is no longer had to blow afloat.Perturbator can be transported at right side weight freely falling body Move under dynamic drive: on the left of the weight-drop of right side, cover plate rises.Although now can gradually have vertical wind to blow out, but weight Bottom thing still can arrive under the effect of inertia force.Air inlet fully opens, and produces vertical wind and right side weight is blown afloat simultaneously Left side cover plate falls, and forms circulation.
A kind of roughness element provided by the utility model, compared with prior art has the advantage that
1. roughness element structure is originally as bluff body, identical with common roughness element function；Meanwhile, top perturbator can produce more Many whirlpools, thus increase turbulence intensity；
2. although this roughness element is by the disturbance of wind field is produced periodic turbulent wind, but is not required to external energy Input, owing to exquisite structure design only just can drive by the wind energy in wind-tunnel；
3. the weight of the grid in roughness element and square can further be upset wind field generation whirlpool thus increase rapids Intensity of flow；
4. roughness element distance test (DT) modal distance is relatively near, and the turbulence intensity of generation is difficult to loss；
5. in use, the size that can regulate weight quality meets the demand under different wind friction velocity.
Accompanying drawing explanation
Fig. 1, this utility model is the front view of the roughness element (opening air intake state) that turbulence intensity strengthens bottom wind-tunnel
Fig. 2, the three-dimensional signal of this utility model roughness element (opening air intake state) that turbulence intensity strengthens bottom wind-tunnel Figure
Fig. 3, the three-dimensional signal of this utility model roughness element (falling state of remaining silent) that turbulence intensity strengthens bottom wind-tunnel Figure
Fig. 4, the schematic perspective view that a kind of multiple autoexcitation formula disturbance roughness element (opening air intake state) of this utility model arrange
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, this utility model is described in further detail, but the embodiment of utility model It is not limited to this.
Embodiment 1
As shown in Figure 1,2 and 3, the roughness element that turbulence intensity strengthens bottom wind-tunnel, top perturbator and bottom receive Wind box forms, and perturbator is connected with box of calling prisoners in after letting them out for exercise by connecting rod, and top perturbator divides left and right two parts, and left distal end is lid Plate, right side is the cell structure of adjustable-angle, and right end is a square weight.
Connecting rod is vertical with box of calling prisoners in after letting them out for exercise to be connected, and its height is 5cm, and the box length of side of calling prisoners in after letting them out for exercise is about 5cm.
Preferably top perturbator divides left and right two parts, and perturbator swings up and down angle and is ± 40 degree.Right side cover panel end 2cm Duan Bushe cell structure, for closed state.
Left distal end be cover plate preferably can the cell structure composition of folding, the little luffer boards in left side and cover plate angle be about 45 degree, The little luffer boards in right side and cover plate angle are-45 degree.
Bottom box of calling prisoners in after letting them out for exercise is preferably bullet, and the air inlet of bullet is the most square.
Embodiment 2
As shown in Figure 1,2 and 3, the roughness element that turbulence intensity strengthens bottom wind-tunnel, top perturbator and bottom receive Wind box forms, and perturbator is connected with box of calling prisoners in after letting them out for exercise by connecting rod, and top perturbator divides left and right two parts, and left distal end is lid Plate, right side is the cell structure of adjustable-angle, and right end is a square weight.
Connecting rod is vertical with box of calling prisoners in after letting them out for exercise to be connected, and its height is 6cm, and the box length of side of calling prisoners in after letting them out for exercise is about 5cm.
Preferably top perturbator divides left and right two parts, and perturbator swings up and down angle and is ± 50 degree.Right side cover panel end 4cm Duan Bushe cell structure, for closed state.
Left distal end be cover plate preferably can the cell structure composition of folding, the little luffer boards in left side and cover plate angle be about 45 degree, The little luffer boards in right side and cover plate angle are-45 degree.
Bottom box of calling prisoners in after letting them out for exercise is preferably bullet, and the air inlet of bullet is the most square.
Preferably this weight is a square box, and centre can be filled with counterweight to regulate disturbance effect.
Embodiment 3
As shown in Figure 1,2 and 3, the roughness element that turbulence intensity strengthens bottom wind-tunnel, top perturbator and bottom receive Wind box forms, and perturbator is connected with box of calling prisoners in after letting them out for exercise by connecting rod, and top perturbator divides left and right two parts, and left distal end is lid Plate, right side is the cell structure of adjustable-angle, and right end is a square weight.
Connecting rod is vertical with box of calling prisoners in after letting them out for exercise to be connected, and its height is 5cm, and the box length of side of calling prisoners in after letting them out for exercise is about 5cm.
Preferably top perturbator divides left and right two parts, and perturbator swings up and down angle and is ± 50 degree.Right side cover panel end 4cm Duan Bushe cell structure, for closed state.
Left distal end be cover plate preferably can the cell structure composition of folding, the little luffer boards in left side and cover plate angle be about 45 degree, The little luffer boards in right side and cover plate angle are-45 degree.
Bottom box of calling prisoners in after letting them out for exercise is preferably bullet, and the air inlet of bullet is the most square.
This weight is a square box, and centre can be filled with counterweight to regulate disturbance effect.
4 one kinds of methods increasing turbulence intensity of embodiment
As shown in Figure 4, the roughness element that the turbulence intensity bottom wind-tunnel of previous embodiment 1-3 either a program strengthens is used. Specifically include:
Wind is blown into from air inlet, and the wind speed that processes through box of calling prisoners in after letting them out for exercise strengthens the wind becoming vertical, same blowing afloat on the right side of perturbator Fall time on the left of, the cover plate that left side falls, cover air inlet and make right side no longer have vertical wind to go out；At right side weight Under drive, the right side cover plate on the left of simultaneously that falls rises, and air inlet continues air intake and forms circulation, to applying in wind field repeatedly to disturb Dynamic, upset to flow turbulence intensity bottom increase.
Above content is to combine the further details of explanation that this utility model is done by concrete preferred implementation, but not Represent that of the present utility model being embodied as is limited to these explanations.Common skill for this utility model art For art personnel, without departing from the concept of the premise utility, it is also possible to make some simple deductions or replacement, It is regarded as belonging to protection domain of the present utility model.

Claims (8)

1. the roughness element that turbulence intensity strengthens bottom the wind-tunnel, it is characterised in that called prisoners in after letting them out for exercise box by top perturbator and bottom Composition, perturbator is connected with box of calling prisoners in after letting them out for exercise by connecting rod, and top perturbator divides left and right two parts, and left distal end is cover plate, Right side is the cell structure of adjustable-angle, and right end is a square weight.
The roughness element that turbulence intensity strengthens bottom wind-tunnel the most according to claim 1, it is characterised in that connect Bar is vertical with box of calling prisoners in after letting them out for exercise to be connected, and its altitude range is 5-10cm.
The roughness element that turbulence intensity strengthens bottom wind-tunnel the most according to claim 1, it is characterised in that preferably Top perturbator divides left and right two parts, and perturbator swings up and down angular range for ± 40-50 degree.
The roughness element that turbulence intensity strengthens bottom wind-tunnel the most according to claim 1, it is characterised in that preferably This weight is a square box, can be filled with counterweight in the middle of box.
The roughness element that turbulence intensity strengthens bottom wind-tunnel the most according to claim 1, it is characterised in that left side End panel preferably can the cell structure composition of folding, the little luffer boards of left side grid and cover plate angle are about 45 degree.
The roughness element that turbulence intensity strengthens bottom wind-tunnel the most according to claim 1, it is characterised in that right side Cover plate front portion is cell structure, and the little luffer boards of right side grid and cover plate angle are-45 degree, and end 2-4cm section does not set grid knot Structure, for closed state.
The roughness element that turbulence intensity strengthens bottom wind-tunnel the most according to claim 1, it is characterised in that bottom Box of calling prisoners in after letting them out for exercise is preferably bullet, and concrete size can be according to wind-tunnel size modification, and the air inlet of bullet is the most square, The length of side is about 5cm.
The roughness element that turbulence intensity strengthens bottom wind-tunnel the most according to claim 7, it is characterised in that this cone The concrete size of body air outlet can be according to wind-tunnel size modification, it is ensured that the length of side of air outlet or diameter be at least square enter / 4th of the air port length of side, the preferably length of side are square orifice or the circular port of a diameter of 1.25cm of 1.25cm.
CN201620302533.XU 2016-04-12 2016-04-12 A coarse unit for turbulence intensity reinforcing of wind -tunnel bottom Expired - Fee Related CN205642792U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105910790A (en) * 2016-04-12 2016-08-31 哈尔滨工业大学深圳研究生院 Self-excitation type disturbance rough element and method for improving turbulent flow strength
CN108051179A (en) * 2017-10-18 2018-05-18 三峡大学 Open channel turbulence inhibitor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105910790A (en) * 2016-04-12 2016-08-31 哈尔滨工业大学深圳研究生院 Self-excitation type disturbance rough element and method for improving turbulent flow strength
CN105910790B (en) * 2016-04-12 2018-05-15 哈尔滨工业大学深圳研究生院 A kind of autoexcitation formula disturbance roughness element and the method for increasing turbulence intensity
CN108051179A (en) * 2017-10-18 2018-05-18 三峡大学 Open channel turbulence inhibitor
CN108051179B (en) * 2017-10-18 2024-04-19 三峡大学 Open channel turbulence control device

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Granted publication date: 20161012

Termination date: 20170412