CN108593244A - A kind of adjustable double pass system of pressure difference - Google Patents
A kind of adjustable double pass system of pressure difference Download PDFInfo
- Publication number
- CN108593244A CN108593244A CN201810374507.1A CN201810374507A CN108593244A CN 108593244 A CN108593244 A CN 108593244A CN 201810374507 A CN201810374507 A CN 201810374507A CN 108593244 A CN108593244 A CN 108593244A
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- chamber
- expansion segment
- card slot
- pressure difference
- postposition
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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
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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
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
Abstract
A kind of adjustable double pass system of pressure difference, is related to water hole or wind-tunnel double pass system.Equipped with preposition chamber, postposition chamber, partition board, laminate model, ring flange and adjustable relief hole；The preposition chamber is equipped with expansion segment and contraction section, and expansion segment is located on contraction section, and laminate model is equipped between expansion segment and contraction section, and the postposition chamber is equipped with card slot, is connected by ring flange between preposition chamber and postposition chamber.All kinds of water holes can be achieved or wind-tunnel needs twin-channel hydrodynamic calculations, with exquisite detailed design, easy device easy to install, single channel incoming is changed to binary channels and stablizes incoming, the pressure difference needed for experimental model both sides is provided with this, the adjustment for also achieving experimental model backside pressure simultaneously solves the inconvenient of previous single channel experiment.
Description
Technical field
The present invention relates to water hole or wind-tunnel double pass systems, more particularly, to a kind of adjustable double pass system of pressure difference.
Background technology
Water hole is a kind of equipment of hydrodynamics experiment, can be used to study boundary layer, wake flow, turbulent flow, cavitation, water elasticity etc.
Active force between phenomenon and flow and test object.Water hole is a flow velocity and the water cycle that pressure can control respectively
System ([1] Zhang Yan, Wang Jiadao, old big numerical simulation [J] lubrications for melting the influence of miniature high-speed water tunnel experiment section Shapes field
With sealing, 2012,37 (06):9-14.).The test section section in water hole have it is circular, it is rectangular, also have rectangle.Water hole
Above and below, forward and backward to have observation window.Not instead of test object exactly the opposite with towing basin, being moved in water hole, it is controllable
Flow.The behavior in service in water hole is similar to subsonic wind tunnel, and only test(ing) medium is different.There are pressure regulating system, upstream top in water hole
There is table in the closed box in portion, has air on the water surface, connect with vacuum pump.When extracting air out, it can reduce in test section
Pressure, the pressure in test section can also be increased.The control system regulation and control water velocity and pressure in water hole, and regulate and control test
System and data processing system etc..Class of wind tunnel is various, and sorting technique is also different.If coming area with experimental section air velocity size
Point, low speed, high speed and hypersonic wind tunnel can be divided into.Wherein substantially there are two types of form, single flow and reflux for low-speed wind tunnel
Formula.Low-speed wind tunnel test section is divided into opening and silent two kinds of forms, and cross sectional shape is different, tests segment length apparent wind hole classification and reality
It tests depending on object, also there is double experimental section wind-tunnel or even three experimental section wind-tunnel ([2] https://www.grc.nasa.gov[OL]
.Pages of drag measurement and force balance)。
Invention content
The purpose of the present invention is to provide a kind of adjustable double pass systems of pressure difference.
The present invention is equipped with preposition chamber, postposition chamber, partition board, laminate model, ring flange and adjustable relief hole；It is described preposition
Chamber is equipped with expansion segment and contraction section, and expansion segment is located on contraction section, and laminate model is equipped between expansion segment and contraction section, described
Postposition chamber is equipped with card slot, is connected by ring flange between preposition chamber and postposition chamber.
The back side of the expansion segment can be to seal or be equipped with adjustable relief hole.
The card slot may be provided in the side of postposition chamber, can be equipped with 3 relief holes in card slot side, size is adjustable.
Single bicubic curve can be used in the expansion segment, and expansion segment is mainly used for reducing speed of incoming flow, and improves upper half
Part incoming-flow pressure, top half hydrostatic pressure is high as far as possible, so the expansion segment back side is sealing, it can also be according to need
Relief hole is opened, so, the fluid-flow rate in expansion segment is extremely slow relative to contraction section.The dilation curve of expansion segment
The shrinkage curve of effect relative constriction section is not very prominent, this is also why only to use single bicubic curve.Expansion segment
The quality of performance depends primarily on two aspects：When divergence ratio, second is that dilation curve.Expansion segment entrance height is true as needed
Fixed, expansion segment outlet height is determined by experimental model, and bicubic curve equation is then determined by entrance height and outlet height, expansion
The length of section is unsuitable long, to reduce cost and reduce near exit boundary layer thickness.
The quality of preposition chamber contraction section performance depends primarily on shrinkage ratio and shrinkage curve.Contraction section main function is to the greatest extent
Lower half portion speed of incoming flow may be improved, incoming static pressure is reduced.The contraction section back side is connection, relative to expansion segment, is shunk bent
Also higher, contraction section use symmetric double cubic curve in view of the installation of model and the requirement of flow velocity and static pressure for the requirement of line,
The distance between dilation curve and shrinkage curve are laminate thickness.Entrance and exit height is respectively R1、R2, on shrinkage curve
Distance of the point away from central axes be R, contractions segment length is L, and specific formula is：
It is using the advantages of symmetric double cubic curve：First, such design can be such that contraction section fluid does not occur point
From especially near inlet and outlet；Secondly, exit flow field uniform parallel is stablized；Finally, it can utilize to the greatest extent
The energy of incoming, pitot loss is small, and the efficiency that pressure potential is converted into power potential energy is very high.
The outer shape of postposition chamber with card slot can be quadrangle box, and side fluting facilitates model to replace, card slot
Depth can be about the 1/3 of postposition chamber wall thickness, be mainly used for placed layer Slab and prevent fluid from overflowing.
The present invention is designed using assembled, and the expansion segment and contraction section of preposition chamber be structure as a whole, thereafter with card
The postposition chamber of slot is connected by ring flange, and independent mutually with laminate model.Card slot is assembled with laminate model for insertion slot type,
Laminate model is set to be convenient for changing and better tightness.
The present invention can be achieved all kinds of water holes or wind-tunnel and need twin-channel hydrodynamic calculations, with exquisite detailed design,
Single channel incoming is changed to binary channels and stablizes incoming by easy device easy to install, is provided needed for experimental model both sides with this
Pressure difference, while the adjustment of experimental model backside pressure is also achieved, solve the inconvenient of previous single channel experiment.
Description of the drawings
Fig. 1 is the structure composition schematic diagram of the embodiment of the present invention.
Fig. 2 is (non-mounting layer Slab) sectional view of the embodiment of the present invention.
Fig. 3 is the bicubic curve of the embodiment of the present invention.
Fig. 4 is the notch schematic diagram of the embodiment of the present invention.
Fig. 5 is the front view of Fig. 4.
Fig. 6 is the single unit system sectional view by taking laminate model as an example of the embodiment of the present invention.
Fig. 7 is (mounting layer Slab) central sectional view of the embodiment of the present invention.
Fig. 8 is the overall profile figure of the embodiment of the present invention.
Specific implementation mode
Following embodiment will the present invention is further illustrated in conjunction with attached drawing.
Referring to Fig. 1~8, the embodiment of the present invention is equipped with preposition chamber 14, postposition chamber 3, partition board 10, laminate model 11, method
Blue disk 5 and adjustable relief hole 4；The preposition chamber 14 is equipped with expansion segment 1 and contraction section 2, and expansion segment 1 is located on contraction section 2, expands
Be equipped with laminate model between section 1 and contraction section 2, the postposition chamber 3 is equipped with card slot 8, preposition chamber 14 and postposition chamber 3 it
Between connected by ring flange 5.
The back side of the expansion segment 1 can be to seal or be equipped with adjustable relief hole 9.
The card slot 8 may be provided in the side of postposition chamber 3, can be equipped with 3 relief holes 4 in 8 side of card slot, size is adjustable.
Single bicubic curve can be used in the expansion segment 1, and expansion segment 1 is mainly used for reducing speed of incoming flow, and improves
Half part incoming-flow pressure, top half hydrostatic pressure is high as far as possible, so 1 back side of expansion segment is sealing, it can also root
According to needing out relief hole 4, so, the fluid-flow rate in expansion segment 1 relative to contraction section 2 extremely slowly.The expansion of expansion segment 1
The shrinkage curve 7 for opening the effect relative constriction section 2 of curve 6 is not very prominent, this is also why only to use single bicubic curve
Reason.The quality of 1 performance of expansion segment depends primarily on two aspects：When divergence ratio, second is that dilation curve 6.1 entrance of expansion segment
Height determines that 1 outlet height of expansion segment is determined that bicubic curve equation then by entrance height and goes out by experimental model as needed
Open height determines that the length of expansion segment 1 is unsuitable long, to reduce cost and reduce near exit boundary layer thickness.
The quality of 2 performance of contraction section of preposition chamber 14 depends primarily on shrinkage ratio and shrinkage curve 7.Contraction section 2 is main
Effect is to improve lower half portion speed of incoming flow as far as possible, reduces incoming static pressure.2 back side of contraction section is connection, relative to expansion
Section 1, also higher, contraction section 2 use symmetrically in view of the installation of model and the requirement of flow velocity and static pressure for the requirement of shrinkage curve 7
Bicubic curve, the distance between dilation curve 6 and shrinkage curve 7 are laminate thickness.Entrance and exit height is respectively R1、
R2, distance of the point away from central axes on shrinkage curve 7 is R, and 2 length of contraction section is L, and specific formula is：
It is using the advantages of symmetric double cubic curve：First, such design can be such that 2 fluid of contraction section does not occur point
From especially near inlet and outlet；Secondly, exit flow field uniform parallel is stablized；Finally, it can utilize to the greatest extent
The energy of incoming, pitot loss is small, and the efficiency that pressure potential is converted into power potential energy is very high.
The outer shape of postposition chamber 3 with card slot 8 can be quadrangle box, and side fluting facilitates model to replace, card slot 8
Depth can be 3 wall thickness of postposition chamber about 1/3, be mainly used for placed layer Slab 11 and prevent fluid from overflowing.
The present invention is designed using assembled, and the expansion segment 1 and contraction section 2 of preposition chamber 14 be structure as a whole, thereafter with band
There is the postposition chamber 3 of card slot 8 to be connected by ring flange 5, and independent mutually with laminate model 11.Card slot 8 and laminate model 11
It is assembled for insertion slot type, laminate model 11 is made to be convenient for changing and better tightness.
Water hole and wind-tunnel are common two equipment in experimental fluid mechanics.Either water hole or wind-tunnel, current sets
The standby overwhelming majority is all single pass.No matter single channel or binary channels, Experimental Flowing Object teaching experiment water hole or wind-tunnel all need
Meet reliable and stable test section air-flow environment.Therefore, the energy of flowing is reduced as far as possible single channel is changed to binary channels
Amount loss, that is to say, that fluid transition during " being divided into two " is gentle, avoids flow separation and various reflux existing
As.The present invention adjusts shrinkage ratio using expansion and contraction section curve, and according to laminate model needs, can also increase relief hole,
Change the dynamic static pressure of two plumes with this.The card slot 8 of postposition chamber 3 is but also the installation of laminate model becomes simpler with replacement
It is single.
The use of the present invention will be described further by taking laminate model 11 as an example below：
If it is intended to the flowing inside observation laminate model 11, cannot achieve using single channel incoming, because of laminate
The entrance 12 and 13 areas of outlet all very littles of model 11, being directly directed at direction of flow can make laminate model 11 bear huge pressure
The pitot loss of power, certain overall flow also can be very big, and it is not in then this problem to use binary channels.
When single channel incoming flows through the device, two parts flowing up and down can be divided into, if Fig. 1 is double pass system scheme
Design drawing, Fig. 6 is the single unit system sectional view by taking laminate model 11 as an example.The component part of the present invention has：Preposition chamber 14,
Postposition chamber 3 with card slot 8,14 centre of preposition chamber divide preposition chamber 14 for expansion segment 1 and contraction section 2 equipped with partition board 10
Upper and lower two parts, also laminate model, ring flange 5 and adjustable relief hole 4 etc..
The fluid of top half can enter expansion segment 1, and for expansion segment 1 using single bicubic Curve Design, main function is to make
Speed of incoming flow reduces, and improves top half incoming-flow pressure.Top half hydrostatic pressure is high as far as possible, so expansion segment
1 back side is sealing, can also open relief hole as needed, and 1 entrance height of expansion segment determines as needed, and expansion segment 1 exports
Height is determined that bicubic curve equation is then determined by entrance height and outlet height by experimental model.
The fluid of lower half portion enters contraction section 2, and the quality of 2 performance of contraction section depends primarily on shrinkage ratio and shrinkage curve
7.2 main function of contraction section is to improve lower half portion speed of incoming flow as far as possible, reduces incoming static pressure.Contraction section 2 will ensure fluid
It does not detach as far as possible, especially near inlet and outlet；Secondly, exit flow field uniform parallel is stablized；Finally, can
The energy of incoming is utmostly utilized, pitot loss is small, and the efficiency that pressure potential is converted into power potential energy is very high.
After expansion segment 1 and contraction section 2, fluid can flow into the postposition chamber 3 with card slot 8, and 8 depth of card slot is wall surface
The 1/3 of thickness is mainly used to snap gauge type and prevents fluid from overflowing, the stream for the top half that postposition chamber 3 is connect with expansion segment 1
Body static pressure will be far above the hydrostatic pressure that lower half portion is connect with contraction section 2, will be formed in 11 both sides of laminate so huge
Pressure difference, but total pitot loss is again very small, that is to say, that the greatest extent using come stream energy.There are three let out 8 side of card slot
Hole 4 is pressed, size is adjustable, while the back side corresponding to expansion segment 1 can also increase relief hole 9 as needed, such as Fig. 4~5.
Claims (6)
1. a kind of adjustable double pass system of pressure difference, it is characterised in that be equipped with preposition chamber, postposition chamber, partition board, laminate model,
Ring flange and adjustable relief hole；The preposition chamber is equipped with expansion segment and contraction section, and expansion segment is located on contraction section, expansion segment with
Laminate model is equipped between contraction section, the postposition chamber is equipped with card slot, is connected by ring flange between preposition chamber and postposition chamber
It connects.
2. a kind of adjustable double pass system of pressure difference as described in claim 1, it is characterised in that the back side of the expansion segment is close
Envelope is equipped with adjustable relief hole.
3. a kind of adjustable double pass system of pressure difference as described in claim 1, it is characterised in that the card slot is located at postposition chamber
Side, card slot side be equipped with 3 relief holes, size is adjustable.
4. a kind of adjustable double pass system of pressure difference as described in claim 1, it is characterised in that the expansion segment uses Dan Shuansan
Secondary curve.
5. a kind of adjustable double pass system of pressure difference as described in claim 1, it is characterised in that the postposition chamber with card slot
Outer shape is quadrangle box, and the depth of card slot is the 1/3 of postposition chamber wall thickness.
6. a kind of adjustable double pass system of pressure difference as described in claim 1, it is characterised in that the expansion segment and receipts of preposition chamber
Contracting section is structure as a whole, and the postposition chamber with card slot is connected by ring flange, and independent mutually with laminate model, card slot with
Laminate model assembles for insertion slot type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810374507.1A CN108593244B (en) | 2018-04-24 | 2018-04-24 | Pressure difference adjustable binary channels device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810374507.1A CN108593244B (en) | 2018-04-24 | 2018-04-24 | Pressure difference adjustable binary channels device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108593244A true CN108593244A (en) | 2018-09-28 |
| CN108593244B CN108593244B (en) | 2020-01-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810374507.1A Expired - Fee Related CN108593244B (en) | 2018-04-24 | 2018-04-24 | Pressure difference adjustable binary channels device |
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| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109781378A (en) * | 2018-12-20 | 2019-05-21 | 西安交通大学 | A kind of dual-purpose experimental system of water hole sink |
| CN110907129A (en) * | 2019-11-29 | 2020-03-24 | 中国计量大学 | Air-float supporting device with one-dimensional freedom and air seal |
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2018
- 2018-04-24 CN CN201810374507.1A patent/CN108593244B/en not_active Expired - Fee Related
Patent Citations (8)
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|---|---|---|---|---|
| US5654512A (en) * | 1995-06-09 | 1997-08-05 | Pacer Industries, Inc. | Flexible membrane variable orifice fluid flow meter |
| JPH10123010A (en) * | 1996-10-24 | 1998-05-15 | Mitsubishi Heavy Ind Ltd | Wind velocity controller for wind tunnel |
| JP2010122152A (en) * | 2008-11-21 | 2010-06-03 | Mitsubishi Heavy Ind Ltd | Method and device for forecasting fluctuating airflow rate in wind tunnel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109781378A (en) * | 2018-12-20 | 2019-05-21 | 西安交通大学 | A kind of dual-purpose experimental system of water hole sink |
| CN110907129A (en) * | 2019-11-29 | 2020-03-24 | 中国计量大学 | Air-float supporting device with one-dimensional freedom and air seal |
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| Publication number | Publication date |
|---|---|
| CN108593244B (en) | 2020-01-07 |
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