CN103422384B - Hydraulic power experimental flow box capable of being used for flow field measurement and visualization research - Google Patents
Hydraulic power experimental flow box capable of being used for flow field measurement and visualization research Download PDFInfo
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- CN103422384B CN103422384B CN201310345159.2A CN201310345159A CN103422384B CN 103422384 B CN103422384 B CN 103422384B CN 201310345159 A CN201310345159 A CN 201310345159A CN 103422384 B CN103422384 B CN 103422384B
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- dilution water
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Abstract
The invention discloses a hydraulic power experimental flow box capable of being used for flow field measurement and a visualization research. The hydraulic power experimental flow box comprises a visualization conical pulp distribution device, a visualization step diffuser, a visualization setting chamber, a visualization turbulence generator, a visualization lip chamber and a dilution water supply system, wherein the visualization conical pulp distribution device, the visualization step diffuser, the visualization setting chamber, the visualization turbulence generator and the visualization lip chamber are connected in sequence to form a box body structure; every adjacent two of the visualization conical pulp distribution device, the visualization step diffuser, the visualization setting chamber, the visualization turbulence generator and the visualization lip chamber are sealed through a concave-convex surface or a tongue-and-groove; meanwhile, a dilution water injection port is arranged on the visualization conical pulp distribution device, and the dilution water supply system is connected with the dilution water injection port through a dilution water pipe. The hydraulic power experimental flow box enables the flow field measurement and the visualization research of the flow box to be conducted conveniently, can effectively realize sealing between nonmetal and nonmetal, and is quite convenient to dismount.
Description
Technical field
The present invention relates to the technical field that dilution water thickens hydraulic pulp flowing box, refer in particular to a kind of hydraulic experiment head box carrying out flow field survey and visual research.
Background technology
At present, it is the conventional advanced high speed head box of generally acknowledging in the world that dilution water thickens hydraulic pulp flowing box, the optimization of its equipment performance and the innovation of technology imperative, domestic and international researcher has carried out correlative study to this, and has achieved many important scientific achievements.
At home, the diluted white water head box of Shandong Chang Hua papermaking equipment Co., Ltd, its dilution water runner is conical tube structure, and this structure possesses the dual-use function of stepped diffuser and mixing chamber simultaneously, and secondary turbulent flow generator is wherein the cellular turbulent flow generator of cross-flow; The high-concentration dilution water head box of Weifang Hicredit Machinery Co., Ltd. injects dilution water by dilution water pipeline in each arm, regulates the size of each point dilution water yield, can control pulpboard cross direction ration and make it uniformity; The high speed paper machine headbox of Henan rivers Paper Co., Ltd, slurry flow-disturbing is little, become that paper uniformity is good, in paper fiber alignment arrangement good, dilution water device wherein, low pulse-frequency modulation charging pump is utilized to supply water to differential pressures such as dilution plain boiled water carry out, be scanned into the quantitative banner curve of paper over dry according to scanning support and can automatically regulate dilution water valve opening, thus dilute entering head box tube bank slurry, improve the view picture page cross direction ration uniformity; Shaanxi Tech Univ studies and discloses dilution water waterpower type flow box control system, and this system can control effectively to dilution water waterpower type flow box, can obtain good cloth slurry, homogenate and gunite effect.
In the world, dilution water thickens the company that head box technical development aspect has a few family to make a strong impact, as Beloit (metso) company, Voith company, Valmet (metso) company, and EsherWyss, Vaahto, Brandes & Heneze Gmbh, G & Lv companies etc., make an effort invariably on minimizing quantitative difference of banner and structure optimization.Its typical product has Converflo and the Coeept series of Beloit company, Sym-flo and the opti-flo series of Valmet company and the Moudel series of Votih.In addition in turbulent flow generator, the homalographic tube bank that Beloit company uses circle to become square, and add drift sheet in labial lamina district, the spacing of drift sheet is very little, is strictly limited in narrow space by turbulent flow; And Voith company adopts staged turbulent flow generator, utilize flow to become turbulence because of the limited vortex that ladder sudden expansion produces, the circle also using variable area becomes square tube bundle.And improving in quantitative difference of banner, achieve progress in the world nearly ten years, with the concept mono-IV head box of Beloit company for representative, make cross direction ration difference by original 1.5% less than level, reduce to less than 1%, considerably improved quality of paper products.
Although domestic, the research of the structure of hydraulic pulp flowing box and control is thickened to dilution water more, and achieve a lot of achievement, the particularly national Eleventh Five-Year Plan science and technology supporting project " development of domestic high speed paper machine " of Chen Kefu academician hosting recently, the paper pulp streaming technology of China and head box technology are mentioned international most advanced level, and the advanced dilution water of foreign study to thicken hydraulic pulp flowing box also more, these head boxs can play larger effect in engineering practice, but all can not meet the requirement of head box flow field survey, visual flow field cannot be obtained.Meet PIV(Particle Image Velocimetry particle image ve locity instrument disclosed in not having at present at home and abroad) etc. measuring system carry out measuring and the head box of visual research, based on this, experiment head box of the present invention is on the basis meeting engineering practice, can under the various speed of a motor vehicle, in head box, the flow field of all parts carries out measuring and visual research, thus make the stream feed technique of head box obtain theoretic breakthrough, good directive function can be had to engineering practice.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of hydraulic experiment head box carrying out flow field survey and visual research is provided, thus makes the stream feed technique of head box obtain theoretic breakthrough, good directive function can be had to engineering practice.
For achieving the above object, technical scheme provided by the present invention is: a kind of hydraulic experiment head box carrying out flow field survey and visual research, include visual taper pulp distributor, visual stepped diffuser, visual plenum chamber, visual turbulent flow generator, visual lip room and for regulating the dilution water feed system of fluid cross direction ration, wherein, described visual taper pulp distributor, visual stepped diffuser, visual plenum chamber, visual turbulent flow generator, visual lip room connects successively, composition body structure, and adjacent sealing between the two adopts male and fomale(M&F) or tongue-and-groove seal form, and make the fluid entered in visual taper pulp distributor can successively through visual stepped diffuser, visual plenum chamber, from the ejection of visual lip room after visual turbulent flow generator, simultaneously, this visual taper pulp distributor is provided with dilution water inlet, dilution water feed system is connected with this dilution water inlet by dilution water pipe, for this visual taper pulp distributor provides dilution water.
Described visual plenum chamber and be connected to visual connecting plate between visual stepped diffuser and visual turbulent flow generator, and adjacent sealing between the two adopts male and fomale(M&F) or tongue-and-groove seal form.
Described adjacent clamp or the bolt of adopting between the two connects.
Adopt male and fomale(M&F) to seal between described visual taper pulp distributor and visual stepped diffuser, and its male and fomale(M&F) is with bolts; Adopt male and fomale(M&F) to seal between visual turbulent flow generator and visual lip room, and its male and fomale(M&F) adopt clamp to connect.
All adopt male and fomale(M&F) to seal between described visual stepped diffuser and visual connecting plate, between visual connecting plate and visual turbulent flow generator, and its male and fomale(M&F) is all with bolts; Adopt tongue-and-groove seal form between visual connecting plate and visual plenum chamber, and its tongue and groove adopts clamp to connect.
Described body structure is equipped with the frame for supporting and adjust its level.
Described visual taper pulp distributor is provided with large and small port and side runner, and fluid first enters from the large port of visual taper pulp distributor, and mainstream fluid enters into side runner, and minority of fluid then flows out from portlet and refluxes.
The rear wall of described visual taper pulp distributor is made up of conic section, and the shape of described visual turbulent flow generator becomes square gradually by circle.
Described visual taper pulp distributor is PMMA lucite taper pulp distributor, visual stepped diffuser is PMMA lucite stepped diffuser, visual plenum chamber is PMMA lucite plenum chamber, visual turbulent flow generator is PMMA lucite turbulent flow generator, and visual lip room is PMMA lucite lip room.
Described visual connecting plate is PMMA lucite connecting plate.
Compared with prior art, tool has the following advantages and beneficial effect in the present invention:
1, PIV(particle image velocimetry is suitable for) the flow field survey system such as particle image ve locity instrument carries out measuring and visual research, clearly can reflect that dilution water thickens runner and the flow field thereof of hydraulic pulp flowing box, the parameter feature in hydraulic pulp flowing box flow field being comprised to speed, vorticity, tubulence energy, dissipative shock wave etc. and velocity correlation all can be measured very easily and study.
2, the hydraulic experiment head box body of the present invention's employing is little, structure simple, good airproof performance, convenient disassembly, cost are low, can carry out the fluid experiment before engineering practice.
Accompanying drawing explanation
Fig. 1 is front view of the present invention.
Fig. 2 is top view of the present invention.
Fig. 3 is the structural representation that visual taper pulp distributor is connected with visual stepped diffuser.
The structural representation that Fig. 4 is visual stepped diffuser, connect between visual connecting plate, visual turbulent flow generator and visual plenum chamber.
Fig. 5 is the structural representation that visual lip room is connected with visual turbulent flow generator.
Fig. 6 adopts PIV measuring system to carry out the schematic diagram of flow field survey and visual research to hydraulic experiment head box.
Fig. 7 is the exit concentration change curve of hydraulic experiment head box.
Detailed description of the invention
Below in conjunction with specific embodiment, the invention will be further described.
Shown in Fig. 1 and Fig. 2, the hydraulic experiment head box of the carried out flow field survey described in the present embodiment and visual research, include visual taper pulp distributor 1, visual stepped diffuser 2, visual plenum chamber 3, visual turbulent flow generator 4, visual lip room 5 and for regulating the dilution water feed system 6 of fluid cross direction ration, wherein, described visual taper pulp distributor 1 is provided with greatly, portlet 101, 102 and side runner 103, pulp stream first enters from the large port 101 of visual taper pulp distributor 1, then mainstream fluid enters into side runner 103, minority of fluid then flows out from portlet 102 and refluxes, described visual taper pulp distributor 1, visual stepped diffuser 2, visual plenum chamber 3, visual turbulent flow generator 4, visual lip room 5 connect successively, composition body structure, and this visual plenum chamber 3 and be connected to visual connecting plate 301 between visual stepped diffuser 2 and visual turbulent flow generator 4, sealing between above-mentioned visual taper pulp distributor 1, visual stepped diffuser 2, visual plenum chamber 3, visual connecting plate 301, visual turbulent flow generator 4, visual lip room 5 are adjacent between two adopts male and fomale(M&F) or tongue-and-groove seal form, and the fluid entered in visual taper pulp distributor 1 can be sprayed from visual lip room 5 successively after visual stepped diffuser 2, visual plenum chamber 3, visual turbulent flow generator 4, simultaneously, even in order to ensure the cross direction profiles of pulp stream in body structure, described visual taper pulp distributor 1 is provided with dilution water inlet 104, dilution water feed system 6 is connected with this dilution water inlet 104 by dilution water pipe 601, the dilution water of dilution water feed system 6 enters the side runner 103 of visual taper pulp distributor 1 by dilution water pipe 601, through visual stepped diffuser 2, visual plenum chamber 3, visual turbulent flow generator 4 after from visual lip room 5 eject successively together with mixing also with paper pulp main flow.In addition, keep level in order to ensure head box when testing, the carrying out of convenient experiment, this hydraulic experiment head box also designs and machined frame 9, and meanwhile, this frame 9 also can support all parts of head box.
See shown in Fig. 3 to Fig. 5, all adopt male and fomale(M&F) to seal between visual taper pulp distributor 1 and visual stepped diffuser 2, between visual stepped diffuser 2 and visual connecting plate 301, between visual connecting plate 301 and visual turbulent flow generator 4 described in the present embodiment, and its male and fomale(M&F) all adopt bolt 8 to connect; Adopt male and fomale(M&F) to seal between described visual turbulent flow generator 4 and visual lip room 5, and its male and fomale(M&F) adopt clamp 7 to connect; Adopt tongue-and-groove seal form between described visual connecting plate 301 and visual plenum chamber 3, and its tongue and groove adopts clamp 7 to connect.
In order to the visual research of the flow field survey and whole runner that realize head box, the all parts contacted with runner of the present embodiment all adopt PMMA lucite to make, namely be above-mentioned visual taper pulp distributor 1, visual stepped diffuser 2, visual plenum chamber 3, visual connecting plate 301, visual turbulent flow generator 4, visual lip room 5 is all manufactured by PMMA lucite, simultaneously, because the rear wall of taper pulp distributor 1 visual described in the present embodiment is made up of conic section, the shape of described visual turbulent flow generator 4 becomes square gradually by circle, for structural complexity, therefore employing numerical-control processing method.And for miscellaneous part as frame 9 and clamp 7, do not participate in the measurement in flow field, consider corrosion-resistant problem, so adopt stainless steel material to make.
In addition, in order to complete the flow field survey to hydraulic experiment head box critical component, the cyclic water tank size length of employing is 3m, 1.5m, 1.7m, and paper pulp front pump and dilution water pump are KZ molded breadth runner pulp pump, the model of paper pulp front pump is KZ125-350, and its flow is 350m
3/ h, lift is 50m, and the model of diluting water pump is KZ80-265, and flow is 265m
3/ h, lift is 60m, and these two pumps all adopt variable frequency control.In the present embodiment, hydraulic experiment head box adopts PIV measuring system to carry out measuring and visual research, it is measured and installs specifically as shown in Figure 6, wherein, in PIV measuring process, the sheet light allowing laser instrument produce is mutually vertical with CCD, and the sheet light needing continuous mobile laser instrument to produce and CCD adjust, measure for different parts, and the paper pulp lower than 0.01% is housed in cyclic water tank, paper pulp enters the large port 101 of visual taper pulp distributor 1 by paper pulp front pump.During work, the exit concentration of hydraulic experiment head box is taken and measured, and then analyzing and processing is carried out to its image, exit concentration change curve can be obtained, specifically as shown in Figure 7, finally draw under the different speed of a motor vehicle, hydraulic experiment head box is after single dilution water valve injects dilution water, the curve recorded in the concentration curve of its lip and engineering practice is unanimous on the whole, and can see from concentration values, both concentration are affected the numeric ratio of width comparatively, and relative difference is less than 5%, shown in table 1 specific as follows.
Subordinate list one concentration coverage comparison sheet
| The speed of a motor vehicle | The width (mm) of impact is measured in PIV | Width (mm) is affected in engineering practice | The percentage of relative width |
| 800m/min | 245 | 240 | 2% |
| 1000m/min | 253 | 258 | 2% |
| 1200m/min | 293 | 285 | 2.7% |
| 1600m/min | 342 | 326 | 4.6% |
After the above scheme of employing, the dilution water that runner of the present invention is same as engineer applied thickens the runner of hydraulic pulp flowing box, the visual research in flow field can be met, the structure flow field of head box in engineering practice can be reflected again, thus make the stream feed technique of head box obtain theoretic breakthrough, and good directive function can be had to engineering practice.Compared to existing technology, the present invention has that body is little, structure is simple, good airproof performance, convenient disassembly, low cost and other advantages, is a desirable head box, is worthy to be popularized.
The examples of implementation of the above are only the preferred embodiment of the present invention, not limit practical range of the present invention with this, therefore the change that all shapes according to the present invention, principle are done, all should be encompassed in protection scope of the present invention.
Claims (10)
1. one kind can be carried out the hydraulic experiment head box of flow field survey and visual research, it is characterized in that: include visual taper pulp distributor (1), visual stepped diffuser (2), visual plenum chamber (3), visual turbulent flow generator (4), visual lip room (5) and for regulating the dilution water feed system (6) of fluid cross direction ration, wherein, described visual taper pulp distributor (1), visual stepped diffuser (2), visual plenum chamber (3), visual turbulent flow generator (4), visual lip room (5) connects successively, composition body structure, and adjacent sealing between the two adopts male and fomale(M&F) or tongue-and-groove seal form, and make the fluid entered in visual taper pulp distributor (1) can successively through visual stepped diffuser (2), visual plenum chamber (3), from visual lip room (5) ejection after visual turbulent flow generator (4), simultaneously, this visual taper pulp distributor (1) is provided with dilution water inlet (104), dilution water feed system (6) is connected with this dilution water inlet (104) by dilution water pipe (601), for this visual taper pulp distributor (1) provides dilution water.
2. a kind of hydraulic experiment head box carrying out flow field survey and visual research according to claim 1, it is characterized in that: described visual plenum chamber (3) and be connected to visual connecting plate (301) between visual stepped diffuser (2) and visual turbulent flow generator (4), and adjacent sealing between the two adopts male and fomale(M&F) or tongue-and-groove seal form.
3. a kind of hydraulic experiment head box carrying out flow field survey and visual research according to claim 1 and 2, is characterized in that: described adjacent clamp (7) or the bolt (8) of adopting between the two connects.
4. a kind of hydraulic experiment head box carrying out flow field survey and visual research according to claim 1, it is characterized in that: between described visual taper pulp distributor (1) and visual stepped diffuser (2), adopt male and fomale(M&F) to seal, and its male and fomale(M&F) adopts bolt (8) to connect; Adopt male and fomale(M&F) to seal between visual turbulent flow generator (4) and visual lip room (5), and its male and fomale(M&F) adopt clamp (7) to connect.
5. a kind of hydraulic experiment head box carrying out flow field survey and visual research according to claim 2, it is characterized in that: between described visual stepped diffuser (2) and visual connecting plate (301), between visual connecting plate (301) and visual turbulent flow generator (4), all adopt male and fomale(M&F) to seal, and its male and fomale(M&F) all adopts bolt (8) to connect; Adopt tongue-and-groove seal form between visual connecting plate (301) and visual plenum chamber (3), and its tongue and groove adopts clamp (7) to connect.
6. a kind of hydraulic experiment head box carrying out flow field survey and visual research according to claim 1, is characterized in that: described body structure is equipped with the frame (9) for supporting and adjust its level.
7. a kind of hydraulic experiment head box carrying out flow field survey and visual research according to claim 1, it is characterized in that: described visual taper pulp distributor (1) is provided with large and small port (101,102) and side runner (103), fluid first enters from the large port (101) of visual taper pulp distributor (1), mainstream fluid enters into side runner (103), and minority of fluid then flows out from portlet (102) and refluxes.
8. a kind of hydraulic experiment head box carrying out flow field survey and visual research according to claim 1, it is characterized in that: the rear wall of described visual taper pulp distributor (1) is made up of conic section, the shape of described visual turbulent flow generator (4) becomes square gradually by circle.
9. a kind of hydraulic experiment head box carrying out flow field survey and visual research according to claim 1, it is characterized in that: described visual taper pulp distributor (1) is PMMA lucite taper pulp distributor, visual stepped diffuser (2) is PMMA lucite stepped diffuser, visual plenum chamber (3) is PMMA lucite plenum chamber, visual turbulent flow generator (4) is PMMA lucite turbulent flow generator, and visual lip room (5) is PMMA lucite lip room.
10. a kind of hydraulic experiment head box carrying out flow field survey and visual research according to claim 2, is characterized in that: described visual connecting plate (301) is PMMA lucite connecting plate.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104237556B (en) * | 2014-09-01 | 2017-02-01 | 江苏大学 | Turbulence generator PIV measuring system |
| CN104727176A (en) * | 2015-03-31 | 2015-06-24 | 华南理工大学 | Method for machining visualized hydraulic flowing pulp box turbulence generator for experiments |
| CN104775319A (en) * | 2015-03-31 | 2015-07-15 | 华南理工大学 | Method for machining pulp distributor for experimentally visual hydraulic headbox |
| CN104792658B (en) * | 2015-04-02 | 2018-03-27 | 青岛科技大学 | A kind of flow-path module and research device for Study of Fluid flow regime |
| CN108613749B (en) * | 2018-04-24 | 2019-09-06 | 中国核动力研究设计院 | A kind of visualization device tilting cambered surface flow-passage-changeable |
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| CN1436263A (en) * | 2000-06-13 | 2003-08-13 | 麦特索纸业公司 | Headbox of paper machine or such |
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