CN104226512B - A kind of annular metal foam straight hole nozzle of high-speed jet device - Google Patents
A kind of annular metal foam straight hole nozzle of high-speed jet device Download PDFInfo
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- CN104226512B CN104226512B CN201410527293.9A CN201410527293A CN104226512B CN 104226512 B CN104226512 B CN 104226512B CN 201410527293 A CN201410527293 A CN 201410527293A CN 104226512 B CN104226512 B CN 104226512B
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- Prior art keywords
- metal foam
- jet
- jet pipe
- nozzle
- hybrid chamber
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/02—Spray pistols; Apparatus for discharge
- B05B7/04—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge
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Abstract
An annular metal foam straight hole nozzle for high-speed jet device, belongs to the high speed impact jet field of fluidics. The present invention there is no in existing fluidics metal foam for improving the problem of jet performance of fluidic device in order to solve. The hybrid chamber of the annular metal foam straight hole nozzle of high-speed jet device and jet pipe outside are fixed with nozzle cage, and fixed axis is positioned at hybrid chamber, and hybrid chamber is enclosed and formed by hybrid chamber wall around, is provided with jet orifice on nozzle cage; The external profile diameter of metal foam layers is identical with the internal diameter of jet pipe, metal foam layers is arranged on the inwall of jet pipe, metal foam layers is provided with hollow section, hybrid chamber and jet pipe linkage section are the truncated conical shape of cross-sectional area convergent, fixed axis, hybrid chamber, jet pipe, metal foam layers and hollow section thereof, nozzle cage and on the jet orifice offered all coaxially arrange. The present invention widens fluidic device effluxvelocity scope, effectively improves the jet ability of nozzle.
Description
Technical field
The present invention relates to a kind of metal foam nozzle, be specifically related to a kind of annular metal of high-speed jet deviceFoam straight hole nozzle, belongs to the high speed impact jet field of fluidics.
Background technology
Fluid is when mobile, and its dynamic pressure can produce kinetic energy. If fluid generation flow at high speed, a fluid stream weekThere is a low-pressure area in limit, therefore a fluid stream low-pressure area around can sweep across near the material of low-pressure area along flowingDirection travels forward together, the general principle of impact jet flow that Here it is, and jet pipe is exactly the base that forms a fluid streamThis device. Therefore jet has extensive application in actual industrial and production process, as jet pump, giant,Jet orifice, turbine blade in jet plane, petroleum resources are cooling, Surface Engineering, electronic device are coldBut, material heat treatment, fire protection etc.
With the example that is cooled on high temperature surface, because impact jet flow can provide in time a large amount of within the unit intervalHigh-speed low temperature fluid, the cryogen that turbulence characteristic is stronger rushes at flank speed after fluidic device sendsAmount of heat is taken away in high temperature surface when with high temperature Surface Contact, and the flow velocity of its heat output and jet fluidThere are much relations, if effluxvelocity is very high, not only can provide a large amount of cryogens, and can be at heightThe surperficial stagnation point of temperature forms a large amount of turbulence whirlpools around, and this Secondary Flow whirlpool can greatly strengthen heat exchange. It is visible,Effluxvelocity scope is to weigh the important indicator of fluidic device performance. In addition, different commercial Application are to jet streamSpeed different with the requirement of flow, this require nozzle arrangements form aspect jet velocity and flow, need to possess goodGood designability.
Metal foam is that an emerging nearly ten years class has good thermal conduction study, acoustics, mechanics, electromagnetismCan multifunctional material, have high-permeability, high-specific surface area, good fluid mix ability, low-density,The advantages such as high-permeability, have very large application potential at aspects such as augmentation of heat transfer, sound insulation, energy-absorbing, filtrations.The permeability of metal foam makes the fluid resistance that this material is larger, is therefore being partially filled metal foam pipelineIn, the flow velocity of foamless fluid zone can be strengthened greatly, the spray by this material for fluidic deviceMouth can improve the speed of jet greatly, and the part that the existence of metal foam simultaneously can be filtered in fluid is mixedMatter. In addition, because the adjustability of the hole parameter (porosity and hole density) of metal foam can strengthen employingThe designability of the nozzle of metal foam. But in the jet performance that metal foam is used for improving fluidic deviceAspect, there is no the report of correlative study.
Summary of the invention
The present invention there is no in existing fluidics metal foam for improving fluidic device in order to solveThe problem of jet performance, and then a kind of annular metal foam straight hole nozzle of high-speed jet device is provided. WithWiden fluidic device effluxvelocity scope, effectively improve the jet ability of nozzle.
The present invention in order to solve the problems of the technologies described above taked technical scheme is:
The annular metal foam straight hole nozzle of a kind of high-speed jet device of the present invention, comprises fixed axis, mixedClose chamber, jet pipe and nozzle cage, wherein hybrid chamber and jet pipe outside are fixed with nozzle cage, fixed axis positionIn hybrid chamber, hybrid chamber is enclosed and is formed by hybrid chamber wall around, is provided with jet orifice on nozzle cage;The annular metal foam straight hole nozzle of high-speed jet device also comprises a metal foam layers, metal foam layersExternal profile diameter identical with the internal diameter of jet pipe, metal foam layers is arranged on the inwall of jet pipe, metalFroth bed is provided with hollow section, and hybrid chamber and jet pipe linkage section are the truncated conical shape of cross-sectional area convergent, instituteState fixed axis, hybrid chamber, jet pipe, metal foam layers and hollow section thereof, nozzle cage and on offerJet orifice all coaxially arranges.
Fluid flows in fixing axial hybrid chamber, and fluid is after hybrid chamber flows into jet pipe, at goldBelong in froth bed and hollow section and have fluid to flow through, but hollow section flow resistance characteristics is than in metal foam layersFlow resistance characteristics to get well, therefore in this section of annular metal foam jet, carry out flow parameter reallocation,The rate of flow of fluid that makes finally to flow out jet orifice is very big.
In order to ensure the harmony of effluxvelocity and jet flow and the good designability of nozzle, to the present inventionTechnical scheme further optimize: the hollow section in described metal foam layers is cylinder type hollow region; CylinderThe radius r of shape hollow areaiWith jet pipe inside radius r0The scope of ratio be 0.1 < Ri<0.9，Ri＝ri/r0。
In order to average out between fluid flow and effluxvelocity, further excellent to technical scheme of the present inventionChange: the porosity ε of metal foam layers and hole density ω scope are respectively 0.7 < ε < 0.99,5PPI < ω<300PPI。
In order to average out between fluid flow and effluxvelocity, further excellent to technical scheme of the present inventionChange: jet pipe inside radius scope is 1mm < r0<200mm。
Owing to thering is the existence of metal foam layers of load and strainability, make jet pipe thickness programmableLess, further the geometric parameter of jet pipe of the present invention is designed the outer radius r of jet pipe1WithInside radius r0The scope of ratio be 1.05 < r1/r0<2.95。
In order to strengthen designability of the present invention, the material of metal foam layers is copper, aluminium, nickel, iron and closesGold, preferred metal foaming material is stainless steel. Metal foam layers of the present invention is dismountable, Ke YidingPhase is changed.
The tubing of described jet pipe adopts seamless steel pipe.
Preferred: the radius r in described cylinder type hollow regioniWith jet pipe inside radius r0Ratio be 0.16, goldBelong to the porosity ε of froth bed and hole density ω scope and be respectively 0.8 and 20PPI. Maximum jet is so setSpeed can reach 300m/s.
The present invention compared with prior art has following effect:
The annular metal foam straight hole nozzle of a kind of high-speed jet device of the present invention is a kind of by indirectly subtractingLittle direct flow area increases effluxvelocity, due to the large but entry-end effect of metal foam flow resistanceShorter, therefore nozzle segment length is unsuitable long. In order to verify practical application effect of the present invention, inventorShower nozzle flow velocity and hollow section radius ratio are studied, as shown in the figure. Taking the entrance flow velocity of jet orifice as10m/s is example, and the maximum effluxvelocity in center of metal foam ring-type sintering shower nozzle outlet can be up to 300m/s,Visible the present invention can significantly improve the speed of impact jet flow. It is necessarily penetrating that the present invention utilizes porous media to haveProperty but the lower feature of permeability, when fluid flows through from non-foam region, center, flow velocity is larger, but metal foamThe maximum effluxvelocity in center of foam ring-type sintering shower nozzle outlet and the relation of hollow section radius ratio are not dullness, there is a maximum, this maximum is between 0.1-0.4, in order to ensure effluxvelocity and jetThe good designability of the harmony of flow and shower nozzle, the hollow section radius ratio scope that the present invention recommends is0.1<Ri< 0.9. Because hole parameter and the pad parameter of metal foam have good designability, thereforeThe present invention has good designability, can design different physical dimensions according to different jet parametersWith metal foam hole parameter, to average out between fluid flow and effluxvelocity; The present invention is relatedAnd fluidic device simple in structure durable, jet efficiency is high, and there is the carrying of anti-blocking, mechanics, filter,The multi-functional characteristics such as nozzle transducer wall ' s abrasion substitutes, good designability.
Brief description of the drawings
Fig. 1 is the structural representation of the annular metal foam straight hole nozzle of a kind of high-speed jet device of the present invention;
Fig. 2 is the graph of a relation of maximum effluxvelocity and hollow section radius;
In figure: 1-fixed axis; 2-hybrid chamber; 3-hybrid chamber wall; 4-jet pipe; 5-metal foam layers;6-nozzle cage; 7-hollow section; 8-jet orifice.
Detailed description of the invention
Detailed description of the invention: describe a kind of high-speed jet dress of present embodiment in conjunction with Fig. 1 and Fig. 2The annular metal foam straight hole nozzle of putting comprises fixed axis 1, hybrid chamber 2, jet pipe 4 and nozzle cage 6,Wherein hybrid chamber 2 and jet pipe 4 outsides are fixed with nozzle cage 6, and fixed axis 1 is positioned at hybrid chamber 2, mixedClose chamber 2 and enclose and form by hybrid chamber wall 3 around, on nozzle cage 6, be provided with jet orifice 8; High rapid fireThe annular metal foam straight hole nozzle of stream device also comprises metal foam layers 5, and the outer rim of metal foam layers 5 is straightFootpath is identical with the internal diameter of jet pipe 4, and metal foam layers 5 is arranged on the inwall of jet pipe 4, metal foamLayer 5 is provided with hollow section 7, and hybrid chamber 2 is the truncated conical shape of cross-sectional area convergent with jet pipe 4 linkage sections,Described fixed axis 1, hybrid chamber 2, jet pipe 4, metal foam layers 5 and hollow section 7 thereof, nozzle cage 6And on the jet orifice 8 offered all coaxially arrange. All parts shown in Fig. 1 are all revolving bodies.
Hollow section 7 in described metal foam layers 5 is cylinder type hollow region; Half of cylinder type hollow regionFootpath riWith jet pipe 4 inside radius r0The scope of ratio be 0.1 < Ri<0.9，Ri＝ri/r0. Metal foam layers 5Porosity ε and hole density ω scope be respectively 0.7 < ε < 0.99,5PPI < ω < 300PPI. Maximum jet velocityDu Keda 300m/s (referring to Fig. 2).
Jet pipe 4 inside radius scopes are 1mm < r0<200mm。
The outer radius r of jet pipe 41With inside radius r0The scope of ratio be 1.05 < r1/r0<2.95。
The material of metal foam layers is copper, aluminium, nickel, iron and alloy thereof, and preferred metal foaming material is not forRust steel. Metal foam layers is dismountable, can regularly replace.
The tubing of jet pipe 4 adopts seamless steel pipe.
In present embodiment, can determine jet pipe caliber, hollow section diameter according to effluxvelocity and traffic requirementAnd metal foam layers hole parameter and other assembly parameters. One deck external profile diameter is identical with jet pipe internal diameterMetal foam layers be installed in jet pipe, jet pipe leading portion connect hybrid chamber, fluid is flowed through after hybrid chamberFlow into after jet pipe metal foam district and hollow section flow velocity on cross section and redistribute, due to metal foam infiltrationRate is lower, and therefore streamwise hollow section flow velocity is very large. Be equipped with one admittedly at hybrid chamber front end centre bitDead axle, fluid flows around fixed axis, fixes a nozzle cage in jet pipe outside, and fluid is from nozzleJet orifice in the middle of cover flows out. Because metal foam flow resistance is large but entry-end effect is shorter, therefore penetrateStream length of tube is unsuitable long. One of important function of the present invention is exactly according to the infiltration of porous media and fluidThe feature that rate difference is larger increases core flow effluxvelocity by indirectly reducing direct flow area. GoldAlthough it is lower to belong to foam permeability, still has certain permeability, therefore depositing of high-permeability metal foam layersCan be by stuck seepage flow hole have tamper in the middle of can preventing time. In addition, in fluid, impurity can be at metal foamThe metallic framework adsorption deposition of foam layer, metal foam has certain filtering function; Metal foam itselfThere is good mechanical strength, therefore the present invention adopt metal foam circulus also have mechanics carrying andSubstitute the effect of pipe wear, the therefore thinner thickness of nozzle tube wall.
Present embodiment is the exemplary illustration to this patent just, does not limit its protection domain, abilityField technique personnel can also change its part, as long as no the Spirit Essence that exceeds this patent, allIn the protection domain of this patent.
Claims (8)
1. an annular metal foam straight hole nozzle for high-speed jet device, comprises fixed axis (1), mixesChamber (2), jet pipe (4) and nozzle cage (6), wherein hybrid chamber (2) and jet pipe (4) outside are solidSurely have nozzle cage (6), fixed axis (1) is positioned at hybrid chamber (2), mixed by around of hybrid chamber (2)Close chamber wall (3) and enclose and form, on nozzle cage (6), be provided with jet orifice (8); It is characterized in that: oneThe annular metal foam straight hole nozzle of planting high-speed jet device also comprises metal foam layers (5), metal foam layers(5) external profile diameter is identical with the internal diameter of jet pipe (4), and metal foam layers (5) is arranged on jet pipe(4) on inwall, metal foam layers (5) is provided with hollow section (7), hybrid chamber (2) and jet pipe (4)Linkage section is the truncated conical shape of cross-sectional area convergent, described fixed axis (1), hybrid chamber (2), jet pipe (4),Metal foam layers (5) and hollow section (7) thereof, nozzle cage (6) and on the jet orifice (8) offered equalCoaxial setting.
2. the annular metal foam straight hole nozzle of a kind of high-speed jet device according to claim 1,It is characterized in that: the hollow section (7) in described metal foam layers (5) is cylinder type hollow region; CylinderThe radius r of shape hollow areaiWith jet pipe (4) inside radius r0The scope of ratio be 0.1 < Ri<0.9，Ri＝ri/r0。
3. the annular metal foam straight hole nozzle of a kind of high-speed jet device according to claim 2,It is characterized in that: the porosity ε of metal foam layers (5) and hole density ω scope are respectively 0.7 < ε < 0.99,5PPI<ω<300PPI。
4. the annular metal foam straight hole nozzle of a kind of high-speed jet device according to claim 3,It is characterized in that: jet pipe (4) inside radius scope is 1mm < r0<200mm。
5. the annular metal foam straight hole nozzle of a kind of high-speed jet device according to claim 4,It is characterized in that: the outer radius r of jet pipe (4)1With inside radius r0The scope of ratio be 1.05 < r1/r0<2.95。
6. according to the annular metal bubble of a kind of high-speed jet device described in claim 1,2,3,4 or 5Foam straight hole nozzle, is characterized in that: the material of metal foam layers is copper, aluminium, nickel or iron.
7. the annular metal foam straight hole nozzle of a kind of high-speed jet device according to claim 6,It is characterized in that: the tubing of described jet pipe (4) adopts seamless steel pipe.
8. the annular metal foam straight hole nozzle of a kind of high-speed jet device according to claim 2,It is characterized in that: the radius r in described cylinder type hollow regioniWith jet pipe (4) inside radius r0Ratio be 0.16,The porosity ε of metal foam layers (5) and hole density ω are respectively 0.8 and 20PPI.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410527293.9A CN104226512B (en) | 2014-10-09 | 2014-10-09 | A kind of annular metal foam straight hole nozzle of high-speed jet device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410527293.9A CN104226512B (en) | 2014-10-09 | 2014-10-09 | A kind of annular metal foam straight hole nozzle of high-speed jet device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104226512A CN104226512A (en) | 2014-12-24 |
| CN104226512B true CN104226512B (en) | 2016-05-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410527293.9A Expired - Fee Related CN104226512B (en) | 2014-10-09 | 2014-10-09 | A kind of annular metal foam straight hole nozzle of high-speed jet device |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3848802A (en) * | 1972-06-01 | 1974-11-19 | Allied Chem | Method and apparatus for the preparation and ejection of a viscous dilatant material |
| US4129231A (en) * | 1975-11-13 | 1978-12-12 | Jeddeloh Bros. Sweed Mills, Inc. | Portable, hand-held gun for dispensing multiple fluidic components to a mixer |
| CN1090796A (en) * | 1992-09-24 | 1994-08-17 | 英特空气喷雾瑞典有限公司 | Apparatus for spray of foam |
| CN1863605A (en) * | 2001-03-16 | 2006-11-15 | 荷兰联合利华有限公司 | Foamer |
-
2014
- 2014-10-09 CN CN201410527293.9A patent/CN104226512B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3848802A (en) * | 1972-06-01 | 1974-11-19 | Allied Chem | Method and apparatus for the preparation and ejection of a viscous dilatant material |
| US4129231A (en) * | 1975-11-13 | 1978-12-12 | Jeddeloh Bros. Sweed Mills, Inc. | Portable, hand-held gun for dispensing multiple fluidic components to a mixer |
| CN1090796A (en) * | 1992-09-24 | 1994-08-17 | 英特空气喷雾瑞典有限公司 | Apparatus for spray of foam |
| CN1863605A (en) * | 2001-03-16 | 2006-11-15 | 荷兰联合利华有限公司 | Foamer |
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| Publication number | Publication date |
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| CN104226512A (en) | 2014-12-24 |
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Effective date of registration: 20151217 Address after: 200240 Dongchuan Road, Shanghai, No. 800, No. Applicant after: Shanghai Jiao Tong University Applicant after: China Petroleum University (East China) Address before: 266580 Qingdao economic and Technological Development Zone, Changjiang Road, No. 66, Shandong Applicant before: China Petroleum University (East China) |
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Granted publication date: 20160525 Termination date: 20161009 |