CN102435416A - Forced isotropic turbulence experimental apparatus - Google Patents
Forced isotropic turbulence experimental apparatus Download PDFInfo
- Publication number
- CN102435416A CN102435416A CN2011102820764A CN201110282076A CN102435416A CN 102435416 A CN102435416 A CN 102435416A CN 2011102820764 A CN2011102820764 A CN 2011102820764A CN 201110282076 A CN201110282076 A CN 201110282076A CN 102435416 A CN102435416 A CN 102435416A
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- water tank
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- belt pulley
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 230000005540 biological transmission Effects 0.000 claims abstract description 28
- 230000001360 synchronised effect Effects 0.000 claims abstract description 4
- 239000011521 glass Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 abstract description 2
- 230000000149 penetrating effect Effects 0.000 abstract 2
- 230000033001 locomotion Effects 0.000 description 7
- 230000001788 irregular Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The invention provides a forced isotropic turbulence experimental apparatus, which relates to a turbulence experimental apparatus and solves the problem that the existing experimental apparatus has a complex experimental system, is inconvenient for measurement and cannot be used in liquid experiments. A motor of the forced isotropic turbulence experimental apparatus is arranged at the bottom end of a chassis; a first pulley is arranged on a first support plate; a second pulley is arranged on a third support plate; the first pulley is connected with the second pulley through a synchronous belt; a first eccentric cam is eccentrically arranged on a first transmission shaft in a penetrating way; one end of a first connecting rod is connected with a first grid, and the other end of the first connecting rod passes through a water box to be rotationally connected with the first eccentric cam; a second eccentric cam is eccentrically arranged on a second transmission shaft in a penetrating way; and one end of a second connecting rod is connected with a second grid, and the other end of the second connecting rod passes through the water box to be rotationally connected with the second eccentric cam. The forced isotropic turbulence experimental apparatus is suitable for being used in a forced isotropic turbulence experiment.
Description
Technical field
The present invention relates to a kind of turbulent flow experimental provision, be specifically related to a kind of isotropic turbulence experimental provision that forces.
Background technology
Isotropic turbulence is the simplest a kind of turbulent flow, and carries out theoretical analysis, experimental study and numerical simulation the most easily.Through a row or several rows regular grid is set in the uniform air flow of wind tunnel experiment section, the uniform air flow vertical current produces irregular disturbance when crossing grid.In the motion process, owing to there is not external interference, developing gradually is isotropic turbulence downstream in this irregular disturbance.Flowing to distance greater than after 30～40 times of grid yardstick, turbulent flow is near isotropy in the uniform air flow of wind tunnel experiment section center.Flowing of grid back can be divided into three representative regions: (1) grid turbulence forms the district; (2) the grid turbulence decay initial stage; (3) grid turbulence decays latter stage.In wind-tunnel or tank (or water hole) experimental provision, the decay isotropic turbulence can only be produced at present, and (statistics is stable) isotropic turbulence can't be obtained to force.Present experimental provision is for addressing the above problem, and fans are placed at eight corner position places that are employed in a little side chamber, have obtained to force isotropic turbulence in center, square chamber, and experimental system is complicated, measurement is inconvenient and can not be used for the problem that liquid is tested but exist.
Summary of the invention
The objective of the invention is to have the experimental system complicacy, measure inconvenient and can't be used for the problem that liquid is tested, and then a kind of isotropic turbulence experimental provision that forces is provided in order to solve existing experimental provision.
Technical scheme of the present invention is: a kind of isotropic turbulence experimental provision that forces comprises underframe and water tank; Water tank is arranged on the underframe, and the said isotropic turbulence experimental provision that forces also comprises motor, bracing frame, first belt pulley, second belt pulley, synchronous band, first transmission shaft, second transmission shaft, first offset cam, second offset cam, first grid, second grid, head rod, second connecting link, first back up pad, second back up pad, the 3rd back up pad and the 4th back up pad, and bracing frame is arranged on the water tank; The outer wall top of water tank has water inlet; The outer wall bottom of water tank has water delivering orifice, and first back up pad and second back up pad are set up in parallel the bottom at underframe, and the 3rd back up pad and the 4th back up pad are set up in parallel the upper end at bracing frame; First transmission shaft is located on first back up pad and second back up pad; Second transmission shaft is located on the 3rd back up pad and the 4th back up pad, and motor is arranged on the bottom of underframe, and the output terminal of motor is connected with first transmission shaft; First belt pulley is arranged on first back up pad; Second belt pulley is arranged on the 3rd back up pad, is connected through band synchronously between first belt pulley and second belt pulley, and first grid and second grid are arranged in the water tank; The first offset cam off-centre is located on first transmission shaft; One end of head rod is connected with first grid, and the other end of head rod passes water tank and first offset cam is rotationally connected, and the second offset cam off-centre is located on second transmission shaft; One end of second connecting link is connected with second grid, and the other end of second connecting link passes water tank and second offset cam is rotationally connected.
The present invention compared with prior art has following effect: 1. experimental system of the present invention is simple, uses liquid to experimentize, and volume is little, and is simple in structure.2. motor of the present invention can change the frequency that grid vibrates through the mode of speed change, forces the intensity of isotropic turbulence thereby change, thereby under different operating modes, experimentizes.3. all be to be fixedly connected between first offset cam of the present invention, second offset cam, head rod, second connecting link, first grid and second grid, and all have certain rigidity, effectively guaranteed the stability of oscillation frequency.4. the present invention uses two identical offset cams to realize the to-and-fro movement of first grid and second grid, guarantees that the to-and-fro movement stroke is identical, symmetrical, realizes forcing isotropic turbulence.5. the present invention uses synchronous band transmission, has realized the synchronism that first transmission shaft and second transmission shaft rotate, thereby has guaranteed the synchronism of first grid and second mesh motion.
Description of drawings
Fig. 1 is an one-piece construction synoptic diagram of the present invention.
Embodiment
Embodiment one: combine Fig. 1 that this embodiment is described; A kind of isotropic turbulence experimental provision that forces of this embodiment comprises underframe 1 and water tank 2; Water tank 2 is arranged on the underframe 1, and the said isotropic turbulence experimental provision that forces also comprises motor 3, bracing frame 4, first belt pulley 5, second belt pulley 6, is with 7, first transmission shaft 8, second transmission shaft 9, first offset cam 10, second offset cam 11, first grid 12, second grid 13, head rod 14, second connecting link 15, first back up pad 16, second back up pad 17, the 3rd back up pad 18 and the 4th back up pad 19 synchronously, and bracing frame 4 is arranged on the water tank 2; The outer wall top of water tank 2 has water inlet 2-1; The outer wall bottom of water tank 2 has water delivering orifice 2-2, and first back up pad 16 and second back up pad 17 are set up in parallel in the bottom of underframe 1, and the 3rd back up pad 18 and the 4th back up pad 19 are set up in parallel the upper end at bracing frame 4; First transmission shaft 8 is located on first back up pad 16 and second back up pad 17; Second transmission shaft 9 is located on the 3rd back up pad 18 and the 4th back up pad 19, and motor 3 is arranged on the bottom of underframe 1, and the output terminal of motor 3 is connected with first transmission shaft 8; First belt pulley 5 is arranged on first back up pad 16; Second belt pulley 6 is arranged on the 3rd back up pad 18, and through being with 7 to be connected synchronously, first grid 12 and second grid 13 are arranged in the water tank 2 between first belt pulley 5 and second belt pulley 6; First offset cam, 10 off-centre are located on first transmission shaft 8; One end of head rod 14 is connected with first grid 12, and the other end of head rod 14 passes water tank 2 and first offset cam 10 is rotationally connected, and second offset cam, 11 off-centre are located on second transmission shaft 9; One end of second connecting link 15 is connected with second grid 13, and the other end of second connecting link 15 passes water tank 2 and second offset cam 11 is rotationally connected.
First offset cam 10 of this embodiment is opposite with second offset cam, 11 eccentric directions; Motor 3 rotates through being with 7 will drive first transmission shaft 8 and second transmission shaft 9 rotates synchronously synchronously; Be converted into the vertical direction motion of the head rod 14 and second connecting link 15 through offset cam; And direction of motion is opposite; Head rod 14 and second connecting link, 15 first grids 12 of drive and second grid 13 are always done rightabout motion, along with the difference of motor 3 rotating speeds, reach different oscillation frequency.
Embodiment two: combine Fig. 1 that this embodiment is described, the water tank 3 of this embodiment is the organic glass water tank.So be provided with; Water tank is a transparent organic glass, conveniently observes experimental apparatuss such as the LDV of application of advanced and particle image velocimeter; Under the situation that does not influence the flow field, force the isotropic turbulence phenomenon to observe and measure to the water tank inner fluid.Other composition is identical with embodiment one with annexation.
Embodiment three: combine Fig. 1 that this embodiment is described, the grid 5 of this embodiment is a square, has a plurality of foursquare turbulent flow mouths on the grid 5.So be provided with, be convenient to realize and accomplish the experimental phenomena that forces isotropic turbulence.Other composition is identical with embodiment one or two with annexation.
Claims (3)
1. one kind is forced the isotropic turbulence experimental provision; It comprises underframe (1) and water tank (2); Water tank (2) is arranged on the underframe (1); It is characterized in that: the said isotropic turbulence experimental provision that forces also comprises motor (3), bracing frame (4), first belt pulley (5), second belt pulley (6), synchronous band (7), first transmission shaft (8), second transmission shaft (9), first offset cam (10), second offset cam (11), first grid (12), second grid (13), head rod (14), second connecting link (15), first back up pad (16), second back up pad (17), the 3rd back up pad (18) and the 4th back up pad (19); Bracing frame (4) is arranged on the water tank (2), and the outer wall top of water tank (2) has water inlet (2-1), and the outer wall bottom of water tank (2) has water delivering orifice (2-2); First back up pad (16) and second back up pad (17) are set up in parallel the bottom in underframe (1); The 3rd back up pad (18) and the 4th back up pad (19) are set up in parallel in the upper end of bracing frame (4), and first transmission shaft (8) is located on first back up pad (16) and second back up pad (17), and second transmission shaft (9) is located on the 3rd back up pad (18) and the 4th back up pad (19); Motor (3) is arranged on the bottom of underframe (1); And the output terminal of motor (3) is connected with first transmission shaft (8), and first belt pulley (5) is arranged on first back up pad (16), and second belt pulley (6) is arranged on the 3rd back up pad (18); Be connected through band (7) synchronously between first belt pulley (5) and second belt pulley (6); First grid (12) and second grid (13) are arranged in the water tank (2), and first offset cam (10) off-centre is located on first transmission shaft (8), and an end of head rod (14) is connected with first grid (12); The other end of head rod (14) passes water tank (2) and is rotationally connected with first offset cam (10); Second offset cam (11) off-centre is located on second transmission shaft (9), and an end of second connecting link (15) is connected with second grid (13), and the other end of second connecting link (15) passes water tank (2) and is rotationally connected with second offset cam (11).
2. according to the said a kind of isotropic turbulence experimental provision that forces of claim 1, it is characterized in that: water tank (2) is the organic glass water tank.
3. according to claim 1 or 2 said a kind of isotropic turbulence experimental provisions that force, it is characterized in that: grid (5) has a plurality of foursquare turbulent flow mouths for square on the grid (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102820764A CN102435416B (en) | 2011-09-21 | 2011-09-21 | Forced isotropic turbulence experimental apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102820764A CN102435416B (en) | 2011-09-21 | 2011-09-21 | Forced isotropic turbulence experimental apparatus |
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| CN102435416A true CN102435416A (en) | 2012-05-02 |
| CN102435416B CN102435416B (en) | 2013-11-20 |
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| CN2011102820764A Expired - Fee Related CN102435416B (en) | 2011-09-21 | 2011-09-21 | Forced isotropic turbulence experimental apparatus |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103489349A (en) * | 2013-10-10 | 2014-01-01 | 中国航空工业集团公司上海航空测控技术研究所 | Device and method for simulating turbulence phenomenon caused by thermal radiation |
| CN106768842A (en) * | 2017-01-03 | 2017-05-31 | 中国海洋大学 | A kind of zero transport simulation produces the experimental provision and method of the adjustable oceanic turbulence of homogeneous isotropism |
| CN108562689A (en) * | 2018-01-04 | 2018-09-21 | 北京交通大学 | A kind of constant volume burning experimental provision and combustion experimental system and method including it |
| CN110231143A (en) * | 2019-06-27 | 2019-09-13 | 中国科学院力学研究所 | A kind of homogeneous isotropic turbulence generating means |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104165751B (en) * | 2014-09-01 | 2017-10-20 | 重庆交通大学 | Horizontal vibration type sediment settlement experimental rig |
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| JPH1062298A (en) * | 1996-08-19 | 1998-03-06 | Mitsubishi Heavy Ind Ltd | Turbulent flow generating device |
| JP2000266635A (en) * | 1999-03-19 | 2000-09-29 | Hitachi Zosen Corp | Boundary layer turbulence-generating device |
| CN2761254Y (en) * | 2004-12-23 | 2006-03-01 | 株洲工学院科技开发部 | Spiral-flow turbulent generator |
| CN1995924A (en) * | 2007-01-04 | 2007-07-11 | 中国人民解放军海军工程大学 | Fiber-optic grating sensor |
| CN101408476A (en) * | 2008-08-14 | 2009-04-15 | 上海第二工业大学 | Minitype apparatus for simulating air turbulence movement |
| CN201805807U (en) * | 2010-09-30 | 2011-04-27 | 宁波大学 | Surge simulator |
-
2011
- 2011-09-21 CN CN2011102820764A patent/CN102435416B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1062298A (en) * | 1996-08-19 | 1998-03-06 | Mitsubishi Heavy Ind Ltd | Turbulent flow generating device |
| JP2000266635A (en) * | 1999-03-19 | 2000-09-29 | Hitachi Zosen Corp | Boundary layer turbulence-generating device |
| CN2761254Y (en) * | 2004-12-23 | 2006-03-01 | 株洲工学院科技开发部 | Spiral-flow turbulent generator |
| CN1995924A (en) * | 2007-01-04 | 2007-07-11 | 中国人民解放军海军工程大学 | Fiber-optic grating sensor |
| CN101408476A (en) * | 2008-08-14 | 2009-04-15 | 上海第二工业大学 | Minitype apparatus for simulating air turbulence movement |
| CN201805807U (en) * | 2010-09-30 | 2011-04-27 | 宁波大学 | Surge simulator |
Non-Patent Citations (2)
| Title |
|---|
| SM DE BRUYN KOPS ET AL.: "Direct numerical simulation of laboratory experiments in isotropic turbulence", 《PHYSICS OF FLUIDS》 * |
| 魏中磊等: "网格湍流微结构的实验研究", 《力学学报》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103489349A (en) * | 2013-10-10 | 2014-01-01 | 中国航空工业集团公司上海航空测控技术研究所 | Device and method for simulating turbulence phenomenon caused by thermal radiation |
| CN106768842A (en) * | 2017-01-03 | 2017-05-31 | 中国海洋大学 | A kind of zero transport simulation produces the experimental provision and method of the adjustable oceanic turbulence of homogeneous isotropism |
| CN106768842B (en) * | 2017-01-03 | 2023-08-11 | 中国海洋大学 | Experimental device and method for generating uniform isotropy adjustable ocean turbulence through zero transportation simulation |
| CN108562689A (en) * | 2018-01-04 | 2018-09-21 | 北京交通大学 | A kind of constant volume burning experimental provision and combustion experimental system and method including it |
| CN110231143A (en) * | 2019-06-27 | 2019-09-13 | 中国科学院力学研究所 | A kind of homogeneous isotropic turbulence generating means |
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| CN102435416B (en) | 2013-11-20 |
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| C14 | Grant of patent or utility model | ||
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Inventor after: Cai Weihua Inventor after: Li Fengchen Inventor after: Zhang Hongna Inventor after: Li Xiaobin Inventor after: Xu Hongpeng Inventor after: Yang Juancheng Inventor after: Jiao Dandan Inventor before: Cai Weihua Inventor before: Li Fengchen Inventor before: Zhang Hongna Inventor before: Li Xiaobin Inventor before: Xu Hongpeng Inventor before: Yang Juancheng |
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Granted publication date: 20131120 |