CN110132523A - A kind of air fairing of dust storm wind-tunnel - Google Patents
A kind of air fairing of dust storm wind-tunnel Download PDFInfo
- Publication number
- CN110132523A CN110132523A CN201910499076.6A CN201910499076A CN110132523A CN 110132523 A CN110132523 A CN 110132523A CN 201910499076 A CN201910499076 A CN 201910499076A CN 110132523 A CN110132523 A CN 110132523A
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- cellular unit
- pipeline section
- wind
- honeycomb
- hole body
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/02—Wind tunnels
- G01M9/04—Details
Abstract
The present invention provides a kind of air fairings of dust storm wind-tunnel, hole body including the both ends open in cuboid and along airintake direction it is sequentially arranged in the intracorporal honeycomb in hole, damping screen and roughness element, the honeycomb includes the first cellular unit successively laid from top to bottom, second cellular unit and third cellular unit, the same cellular unit is by caliber of the same race, the pipeline section of length is combined, pipeline section caliber in first cellular unit is greater than the second cellular unit, pipeline section caliber in second cellular unit is greater than third cellular unit, the roughness element is multiple uniformly distributed square blocks.The present invention has successively arranged combined type honeycomb, damping screen, roughness element from front to back, device structure is compact, compact, movement easy to carry, only needing two people one in front and one in back when field carries out earth's surface stream in-situ test with needing to move sample can be easily accomplished, it is practical, it can promote the use of.
Description
Technical field
The present invention relates to a kind of dust storm wind-tunnel for simulating dust storm phenomenon, and in particular to a kind of air rectification dress of dust storm wind-tunnel
It sets.
Background technique
Dust storm wind-tunnel is a kind of low-speed wind tunnel for simulating field dust storm phenomenon, for studying different vegetation and wind erosion composition granule
The changing rule of stream during aeolian transport, dust storm wind-tunnel is more demanding to simulation of natural flow field, to obtain quality
Stablize, the flow field that air-flow is uniform, turbulivity is low, realizes that steady air flow and emulation are big frequently with the method for installing air fairing additional
The purpose in gas boundary layer.
Steady air flow is often realized by stable section, is generally made of honeycomb and damping screen, and the effect of honeycomb is to lead directly
Air-flow reduces air stream turbulence degree, reduces airflow fluctuation, keeps Velocity Profiles uniform, honeycomb is by rectangular, round, hexagon
Small pipeline composition, Maelstrom can be divided into small whirlpool, reduce turbulivity, keep air flow method uniform by damping screen.
Accurate emulation to atmospheric boundary layer is the important guarantee of dust storm Flow Field in Wind Tunnel quality, and Boundary layer simulation has two
Kind of method: self-assembling formation be artificially formed, self-assembling formation atmospheric boundary layer needs length up to the long experimental section of 20~30 times of width,
And be artificially formed, required length can be greatly shortened, frequently with the methods of gridding method, stick grid method, wedge method.Existing air
Often volume is larger for fairing, is not easy artificial movement, and honeycomb is of single specification, flexible combination variation is unable to, to the whole of air-flow
It is poor to flow effect.
Summary of the invention
Technical problem to be solved by the present invention lies in view of the above shortcomings of the prior art, provide a kind of dust storm wind-tunnel
Air fairing, the present invention has preferable flow quality, lesser equipment volume and easily uses operating method, practical
Property is strong.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of air fairing of dust storm wind-tunnel,
It is characterised in that it includes in cuboid both ends open hole body and be sequentially arranged in the intracorporal combined type bee in hole along airintake direction
Nest device, damping screen and roughness element.
The combined type honeycomb includes the first cellular unit, the second cellular unit and third being from top to bottom sequentially arranged
Cellular unit, first cellular unit, the second cellular unit and third cellular unit are arranged successively by the pipeline section of different tube diameters
It stacks and is composed, the diameter of the pipeline section in same cellular unit and be equal in length, by from upper in the combined type honeycomb
Pipeline section diameter in the first cellular unit of sequence down, the second cellular unit and third cellular unit is sequentially reduced.
The roughness element includes multiple uniformly distributed square blocks on the body bottom surface of hole, the side length of the square block
3 are arranged for 5cm, the multiple every row interval 15cm of square block, arrange 3 rows altogether, and be divided into 10cm between arranging.
The damping screen selects 20 mesh single layer damping screens.
Preferably, the length, width and height of hole body are respectively 1m, 0.6m and 0.5m.
Preferably, the pipeline section diameter in first cellular unit is 50mm, length of pipe section 25cm, and the first honeycomb list
11~12 root canal sections are set in the every arrangement of pipeline section in member, arrange 6 rows altogether；Pipeline section diameter in second cellular unit is 20mm,
Length of pipe section is 15cm, and the every arrangement of the pipeline section in the second cellular unit sets 29~30, arranges 7 rows altogether；The third honeycomb
Pipeline section diameter in unit is 15mm, length of pipe section 15cm, and the every arrangement of pipeline section in third cellular unit sets 39~40
Pipeline section arranges 5 rows altogether, and the number of plies arrangement of pipeline section can be carried out according to surface condition in actual use in each cellular unit
Adjustment is not limited in the arrangement that the number of plies is 7,6,5.
Preferably, the damping screen is arranged in the rear of combined type honeycomb perpendicular to airintake direction, the damping screen with
The hole body sidewall gapless fitting.
Preferably, it is placed in the hole body and is provided with card slot at left and right sides of the position of combined type honeycomb, described first
Be provided with below cellular unit, the second cellular unit and third cellular unit with the card slot cooperation for facilitate be isolated,
The buckle for replacing cellular unit extracts combined type honeycomb out, changes the honeycomb of suitable caliber when needing to adjust wind profile
Unit is inserted into card slot.
Preferably, the rear of the roughness element is provided with sand-taped instrument along airintake direction in the hole body, in the hole body
The wind speed survey for computer system automatic measurement & calculation wind speed is offered on the side wall at the rear of the roughness element along airintake direction
Hole, the wind-tunnel is interior to be provided with sensor by wind speed gaging hole, and sensor is connect with computer system.
Compared with the prior art, the present invention has the following advantages:
1, successively arranged from front to back combined type honeycomb, damping screen, roughness element of the invention, device structure is compact, body
Small and exquisite, the movement easy to carry of product only needs two people one when field carries out earth's surface stream in-situ test with needing to move sample
It can be easily accomplished after previous.
2, the combined type honeycomb that the present invention designs has not only acted as honeycomb in traditional design and has led straight air-flow, reduces whirlpool
Rotation, the effect for improving the air-flow uniformity, moreover it is possible to distribute airflow space cloth by upper end large diameter pipeline, lower end small-bore pipeline
Office, formed upper end air-flow velocity it is big, the small atmospheric boundary layer of lower end air-flow velocity, be integrally formed meet natural situation to number form
The wind profile of state, realize in the design of traditional dust storm wind-tunnel Boundary layer simulation section up and down the stick grid of different densities arrangement,
The function of the devices such as triangle wedge.
3, the present invention is mounted with card slot in hole body both sides side, and the cellular unit of different tube diameters is mutually indepedent, same caliber
Pipeline section be an entirety, be fixed in the body of hole at the lower part both ends of cellular unit using buckle, when needing to wind profile tune
When section, combined type honeycomb being extracted out, changing the cellular unit of suitable caliber, insertion card slot can be completed adjustment replacement, facilitate conjunction
Reason, it is practical.
Invention is further described in detail with reference to the accompanying drawings and examples.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention.
Fig. 2 is the combining structure schematic diagram of combined type honeycomb and card slot buckle in the present invention.
Fig. 3 is the junction partial enlarged view of card slot and buckle in the present invention.
Fig. 4 is influence statistical form of the fairing to wind profile in the present invention.
Fig. 5 be in the present invention in 20Hz influence line chart of the fairing to wind profile.
Fig. 6 be in the present invention in 25Hz influence line chart of the fairing to wind profile.
Fig. 7 is the relational graph of aerodynamic roughness and vegetation cover degree in the present invention.
Fig. 8 is stream structure chart under each vegetation cover degree level in the present invention.
Fig. 9 is the functional relation of stream silt discharge and height under different vegetation cover degrees in the present invention.
Figure 10 is the silt discharge vertical characteristics figure of different water cut soil in sand ground soil in the present invention.
Figure 11 is the silt discharge vertical characteristics figure of different water cut soil in sandy grassland soil in the present invention.
Figure 12 is the silt discharge vertical characteristics figure of different water cut soil in farmland soil in the present invention.
Figure 13 is the silt discharge vertical characteristics fit correlation table of different water cut soil in the present invention.
Description of symbols:
1-hole body；2-combined type honeycombs；3-damping screens；
4-roughness elements；5-card slots；6-airintake directions；
7-the first cellular unit；8-the second cellular unit；9-third cellular units；
10-buckles.
Specific embodiment
As shown in Figure 1, the present invention includes the hole body 1 in the both ends open of cuboid and is sequentially arranged in along airintake direction 6
Combined type honeycomb 2, damping screen 3 and roughness element 4 in hole body 1.
As shown in Fig. 2, the combined type honeycomb 2 includes the first cellular unit 7 being from top to bottom sequentially arranged, the second bee
Nest unit 8 and third cellular unit 9, first cellular unit 7, the second cellular unit 8 and third cellular unit 9 are by different pipes
The pipeline section of diameter is arranged successively to stack and be composed, and the diameter of the pipeline section in same cellular unit and is equal in length, the combination
Pipeline section in interior sequence the first cellular unit 7 pressed from top to bottom of formula honeycomb 2, the second cellular unit 8 and third cellular unit 9
Diameter is sequentially reduced.
The roughness element 4 includes multiple uniformly distributed square blocks on 1 bottom surface of hole body, the side of the square block
A length of 5cm, the multiple every row interval 15cm of square block arrange 3, arrange 3 rows altogether, and be divided into 10cm between arranging.
The damping screen 3 selects 20 mesh single layer damping screens.
In the present embodiment, the length, width and height of hole body 1 are respectively 1m, 0.6m and 0.5m.
In the present embodiment, pipeline section diameter in first cellular unit 7 is 50mm, length of pipe section 25cm, and first
11~12 root canal sections are set in the every arrangement of pipeline section in cellular unit 7, arrange 6 rows altogether；Pipeline section diameter in second cellular unit 8
The every arrangement of pipeline section for 20mm, length of pipe section 15cm, and in the second cellular unit 8 sets 29~30, arranges 7 rows altogether；It is described
Pipeline section diameter in third cellular unit 9 is 15mm, length of pipe section 15cm, and the every arrangement of pipeline section in third cellular unit 9
39~40 root canal sections are set, arrange 5 rows altogether.
In the present embodiment, the rear of combined type honeycomb 2, the resistance are arranged in perpendicular to airintake direction 6 for the damping screen 3
Buddhist nun's net 3 is bonded with the 1 side wall gapless of hole body.
As shown in figure 3, the left and right sides wall for the position for placing combined type honeycomb in the hole body 1 is set in the present embodiment
Be equipped with card slot 5, the lower section two sides of first cellular unit 7, the second cellular unit 8 and third cellular unit 9 be provided with
Buckle 10 of the cooperation of card slot 5 for facilitating isolation, replacing cellular unit, when needing to adjust wind profile, extraction group
Box-like honeycomb 2 changes the cellular unit of suitable caliber, is inserted into card slot 5.
In the present embodiment, the rear of the roughness element 4 is provided with sand-taped instrument along airintake direction 6 in the hole body 1, it is described
It is offered on the side wall at the rear of the roughness element 4 for computer system automatic measurement & calculation wind speed in hole body 1 along airintake direction 6
Wind speed gaging hole, sensor is provided with by wind speed gaging hole in the wind-tunnel 1, the sensor is connect with computer system.
The present invention can be used for studying influence of this fairing to wind tunnel speed profile, sand dune difference cover degree vegetation to earth's surface
Influence and different soils moisture content of the influence, sand dune difference cover degree vegetation of wind profile to earth's surface Structure of wind-Sand Flow are to stream
The influence of structure, described in the following application examples of concrete application:
Application examples 1: a kind of influence of dust storm wind straighter device to wind tunnel speed profile is studied
Wind tunnel fan can adjust power frequency by using frequency converter and can control to realize certain blade rotational speed
The quasi- wind tunnel speed of molding.By installing fairing additional and withouyt fairing, adjusting frequency converter respectively in 20Hz and 25Hz
When the wind profile of test chamber is measured, compare influence of the fairing to wind profile.Since ground frictional resistance is made
With the wind profile of field natural wind is generally distributed in logarithmic function.As shown in Figures 4 to 6, do not have when frequency converter is in 20Hz
Each height wind speed is more similar under fairing, fluctuates in 10.4m/s or so, after installation fairing from height 5cm to 10cm
Wind speed increases rapidly, and 10cm to 15cm is slowly increased, and 15cm or more wind speed is stablized in 10.9m/s or so, and wind profile meets pair
Number function: y=2.4277ln (x)+3.6385R2=0.7532.Frequency converter does not have 5~20cm high under fairing in 25Hz
It is more similar to spend wind speed, is fluctuated in 12.15m/s or so, 20~30cm wind speed is declined slightly, from height after installation fairing
5cm to 10cm wind speed increases rapidly, and 10cm to 20cm is slowly increased, and 20cm or more wind speed is stablized in 13.57m/s or so, wind speed
Profile meets logarithmic function: y=2.2033ln (x)+6.9335R2=0.7115.Show that the present apparatus can effectively stable wind turbine apparatus
Air flow method, can good simulation field natural wind.
Application examples 2: influence of the research sand dune difference cover degree vegetation to earth's surface wind profile
Aerodynamic roughness Z0Refer to the height that near surface mean wind speed is zero, it can reflect vegetation to underlying surface
The influence intensity in flow field.Wind-tunnel uses this fairing, and the test section of bottom end opening is placed in different vegetation cover degrees in situ
On table, sky is calculated by test section exit 5cm when measurement wind-tunnel axis wind speed 15m/s and the air speed value at 30cm height
Aerodynamics roughness, calculation formula: Z0=exp [(U1lnZ2-U2lnZ1)/(U1-U2)], wherein Z1、Z2For 5,30cm height
Value, U1、U2For 5,30cm height air speed value.
As shown in fig. 7, aerodynamic roughness increases with the increase of vegetation cover degree.Vegetation cover degree is less than 36% space-time
Aerodynamics roughness is more gentle with the increase of vegetation cover degree, when vegetation cover degree be greater than 36% when, aerodynamic roughness with
The increase of vegetation cover degree sharply increases.To vegetation cover degree (X) and aerodynamic roughness (Z0) relationship carry out Function Fitting,
It can be expressed as cubic function relationship: Z0=-5E-06x3+0.0013x2- 0.0297x+0.0462, R2=0.969, it is closed by function
Correlation known to system is good, shows that the present apparatus can be used for the measurement of ground roughness.
Application examples 3: influence of the research sand dune difference cover degree vegetation to earth's surface Structure of wind-Sand Flow
Structure of wind-Sand Flow refers to vertical distribution and changing rule of the grains of sand under air-flow conveying, is the core of blown sand physics
Content, Structure of wind-Sand Flow can directly reflect sand incipience mode, grind to the development differentiation of soil drifting condition evaluation, aeolian landform
Study carefully, Desertification Control and production practices all have great importance.Original is carried out in sand dune difference vegetation cover degree earth's surface using wind-tunnel
Bit test, by Keerqin sandy land difference vegetation cover degree sand dune dust storm flow data calculate analyze, inquire into sand flow sediment transportation rate with
The changing rule of height, as shown in Figure 8 and Figure 9, with the increase of ground level, silt discharge under each vegetation cover degree level under
Drop, silt discharge (Y) and height (X) can be described as exponential function relation.
Application examples 4: influence of the research different soils moisture content to Structure of wind-Sand Flow
By carrying out wind-tunnel deflation experiment under different water cut to three kinds of semiarid Horqin Region, northeast typical soil, study
The changing rule of Structure of wind-Sand Flow husky, sandy grassland soil and farmland soil are under different water cut, three kinds of soil property different water cuts
The vertical characteristics of stream are as shown in Figure 10 to Figure 12 under rate, the sediment transport under husky, sandy grassland soil and each moisture content of farmland soil
Rate rises with height and reduces, and the lower silt discharge downward trend of moisture content is more obvious.Same soil property different water cut is to wind
The vertical characteristics of sand drift have significant difference, by the silt discharge and height under husky, sandy grassland soil and each moisture content of farmland soil
It carries out curve fitting, exponential function can be described as: q=Ae-H/B, in formula, q is the silt discharge g/ (min at height H
cm2), A, B are fitting coefficient.Silt discharge and the fit correlation of height are as shown in figure 13 under each soil sample different water cut, all have
The preferable degree of correlation shows that the present apparatus can be used in the correlative study that arid soil moisture content influences stream.
The above is only presently preferred embodiments of the present invention, is not intended to limit the invention in any way.It is all according to invention skill
Art any simple modification, change and equivalence change substantially to the above embodiments, still fall within technical solution of the present invention
Protection scope in.
Claims (4)
1. a kind of air fairing of dust storm wind-tunnel, which is characterized in that including in cuboid both ends open hole body (1) and
Combined type honeycomb (2), damping screen (3) and the roughness element (4) being sequentially arranged in along airintake direction (6) in hole body (1)；
The combined type honeycomb (2) includes the first cellular unit (7) being from top to bottom sequentially arranged, the second cellular unit (8)
With third cellular unit (9), first cellular unit (7), the second cellular unit (8) and third cellular unit (9) are by difference
The pipeline section of caliber is arranged successively to stack and be composed, the diameter and equal length of the pipeline section in same cellular unit, the combination
By the first cellular unit of sequence (7), the second cellular unit (8) and third cellular unit (9) from top to bottom in formula honeycomb (2)
Interior pipeline section diameter is sequentially reduced；
The damping screen (3) is arranged perpendicular to airintake direction (6), and the damping screen (3) and hole body (1) the side wall gapless are pasted
It closes；
The roughness element (4) includes multiple uniformly distributed square blocks on hole body (1) bottom surface.
2. a kind of air fairing of dust storm wind-tunnel according to claim 1, which is characterized in that in the hole body (1)
The left and right sides wall for placing the position of combined type honeycomb (2) is provided with card slot (5), first cellular unit (7), the second bee
The lower section both ends of nest unit (8) and third cellular unit (9), which are provided with, to be cooperated with the card slot (5) for being isolated, replacing bee
The buckle (10) of nest unit.
3. a kind of air fairing of dust storm wind-tunnel according to claim 1, which is characterized in that the first honeycomb list
Pipeline section diameter in first (7) is 50mm, and the pipeline section diameter in second cellular unit (8) is 20mm, the third honeycomb list
Pipeline section diameter in first (9) is 15mm.
4. a kind of air fairing of dust storm wind-tunnel according to claim 1, which is characterized in that in the hole body (1)
The rear of the roughness element (4) is provided with sand-taped instrument along airintake direction (6), along airintake direction (6) in institute in the hole body (1)
State the wind speed gaging hole offered on the side wall at the rear of roughness element (4) for computer system automatic measurement & calculation wind speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910499076.6A CN110132523B (en) | 2019-06-11 | 2019-06-11 | Air rectifying device of wind sand wind tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910499076.6A CN110132523B (en) | 2019-06-11 | 2019-06-11 | Air rectifying device of wind sand wind tunnel |
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| CN110132523A true CN110132523A (en) | 2019-08-16 |
| CN110132523B CN110132523B (en) | 2020-05-05 |
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| CN201910499076.6A Expired - Fee Related CN110132523B (en) | 2019-06-11 | 2019-06-11 | Air rectifying device of wind sand wind tunnel |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111006836A (en) * | 2019-12-16 | 2020-04-14 | 华中科技大学 | Tandem supersonic and hypersonic wind tunnel and flow stabilizing method thereof |
| CN111272383A (en) * | 2020-03-31 | 2020-06-12 | 杭州佐格通信设备有限公司 | Honeycomb structure for mounting wind tunnel and wind tunnel |
| CN113252293A (en) * | 2021-06-08 | 2021-08-13 | 中国空气动力研究与发展中心低速空气动力研究所 | Gas rectification structure inside box body |
| CN114894430A (en) * | 2022-07-13 | 2022-08-12 | 中国航空工业集团公司沈阳空气动力研究所 | Installation accuracy measurement method of wind tunnel honeycomb device |
| JP7451336B2 (en) | 2020-07-22 | 2024-03-18 | 上田日本無線株式会社 | Rectification structure for gas sensors |
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| CN110132523B (en) | 2020-05-05 |
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