CN103954429B - A kind of imitative lotus leaf bar peripheral flow drag reduction test model - Google Patents
A kind of imitative lotus leaf bar peripheral flow drag reduction test model Download PDFInfo
- Publication number
- CN103954429B CN103954429B CN201410131097.XA CN201410131097A CN103954429B CN 103954429 B CN103954429 B CN 103954429B CN 201410131097 A CN201410131097 A CN 201410131097A CN 103954429 B CN103954429 B CN 103954429B
- Authority
- CN
- China
- Prior art keywords
- test model
- lotus leaf
- leaf bar
- imitative lotus
- support
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The present invention relates to a kind of imitative lotus leaf bar peripheral flow drag reduction test model, comprising: a support, as the carrier of imitative lotus leaf bar test model and other annexes; A pole, for fixing this test model to, in wind-tunnel or water hole, being connected with peripheral equipment simultaneously; A fixing pole, for fixing lotus leaf bar test model, and is connected with support by bolt; Three imitative lotus leaf bar test models, are bolted and are fixed between support and fixing pole, so that the drag-reduction effect of test lotus leaf bar test model and flow field, rear situation.
Description
Technical field
The present invention relates to a kind of drag reduction model, particularly relate to a kind of imitative lotus leaf bar peripheral flow drag reduction test model, belong to bionics techniques field.
Background technology
Peripheral flow is one of classical problem of hydromeehanics, is extensively present in scientific research and the engineering practice fields such as aerospace, construction work, hydro project, high-altitude cable, machinery, nuclear industry, ocean drilling well, Wind Engineering. As far back as 1908, Benard just recorded in water cylinder back to the periodicity vortex shedding flowing side. Within 1911, Feng Kamen have studied the stability of the two row vortex streets that peripheral flow produces theoretically, hereafter causes numerous scholar and is paid close attention to widely by circumferential motion problem. Along with the increase of Reynolds number, viscous incompressible fluid can present various different flow state around the flowing of cylinder, when Reynolds number is bigger, wake flow is unstability first, periodic swinging occurs, then, along with whirlpool alternately comes off, spew out into wake flow and form card door vortex street, along with the increase of Reynolds number, flowing becomes more and more complicated, finally develops into turbulent flow. Card door vortex street is phenomenon important in hydromeehanics, in daily life, the wind song of wind electric wire causes due to vortex-shedding, equipment also can be damaged by the resonance blocking the initiation of door vortex street in engineering, typically the wind of U.S. Tacoma bridge ruins accident, in addition, coming off of whirlpool also can cause equipment resistance to increase, and causes very big threat for the aspect such as stabilization of equipment performance and safety of structure. At present for the drag reduction streamed mainly by changing the method for equipment profile and material, mainly have the following disadvantages:
(1) in engineer applied, the strict demand for equipment profile and material also necessarily limit its design, is unfavorable for the optimization of design.
(2) additional cost that can increase equipment is chosen for the specialized designs of profile and material, it is unfavorable for the universal of peripheral flow drag reduction technology.
Summary of the invention
The technical problem solved
In order to avoid the deficiencies in the prior art part, the present invention proposes a kind of drag reduction test model being specifically designed to peripheral flow, this model only need to process the surface tissue of different shapes, size and spacing in equipment surface, thus test different structure to the drag-reduction effect of peripheral flow, this model can increase substantially comparability and the accuracy of test result, reduce cut-and-try work amount, it is to increase conventional efficient.
Technical scheme
A kind of imitative lotus leaf bar peripheral flow drag reduction test model, it is characterised in that comprise pole 1, support 2, first spring washer 3, first nut 4, bolt 5, the 2nd spring washer 6, the 2nd nut 7, fixing pole 8, imitative lotus leaf bar test model the 9, the 3rd spring washer 10, the 3rd nut 11, smooth cylinder test model 12 and pilot hole 13; The two ends of the through support 2 of pole 1, lower end is fixed by the first nut 4, it is open type structure in the middle of support 2 upper end, both sides are provided with step, fixing pole 8 is arranged on the step of support 2, both are connected by bolt 5, and fixing pole 8 is provided with three pilot holes 13, fixing imitative lotus leaf bar test model 9 and smooth cylinder test model 12; Described imitative lotus leaf bar test model 9 is identical with smooth cylinder test model 12 structure, comprises thread segment 15, first step 14, the 2nd step 16, middle section 18 and positioning section 17; Positioning section 17 inserts the lower end of support 2, and thread segment 15 runs through pilot hole 13 and is connected on fixing pole 8, and thread segment upper end uses the 3rd nut 11 to fix, and centre adds pad the 3rd spring washer 10.
Described support 2 two ends are that interior external diameter is respectively �� 8 and the cylindrical structure of �� 12.
The diameter of described middle section 18 is �� 8.
The microstructure of described imitative lotus leaf bar test model 9 is the thorn of projection, by the shape of adjustment microstructure, size and density, it is achieved the optimization of drag-reduction effect.
Middle section 18 diameter that adjacent imitative lotus leaf bar test model 9 or the spacing of smooth cylinder test model 12 are greater than 5 times, prevents the mutual interference in flow field, peripheral flow test model back.
Useful effect
The imitative lotus leaf bar peripheral flow drag reduction test model of the one that the present invention proposes, tool has the following advantages:
1, adopt and directly design the method for one layer of different size and spacing microstructure at peripheral flow body surface and test its drag-reduction effect, do not need the profile and the material that change object, overcoming the deficiencies in the prior art, practicality, novelty are stronger, have a extensive future.
2, adopt separation design, it is convenient to the installation and removal of peripheral flow test model, and bolt is connected with the stability being beneficial to and strengthening model, makes test result more accurate.
3, a smooth cylinder model and two peripheral flow drag reduction models can be tested simultaneously, greatly reduce cut-and-try work amount, be conducive to improving test efficiency; And while multiple model, test improves the consistence of different model experiment state and the accuracy of experiment research, is conducive to the contrast of test result and the assessment of drag-reduction effect.
Accompanying drawing explanation
Fig. 1 peripheral flow of the present invention drag reduction test model front view
1-pole, 2-support, 3-first spring washer, 4-first nut, 5-bolt, 6-the 2nd spring washer, 7-the 2nd nut, the fixing pole of 8-, 9-imitative lotus leaf bar test model, 10-the 3rd spring washer, 11-the 3rd nut, the smooth cylinder test model of 12-, 13-pilot hole
In Fig. 2 peripheral flow drag reduction test model front view, A-A is to cross sectional view
The imitative lotus leaf bar structure partial enlarged view in a place in Fig. 3 peripheral flow drag reduction test model front view
The imitative lotus leaf bar structure partial enlarged view in b place in Fig. 4 peripheral flow drag reduction test model front view
Fig. 5 peripheral flow test model structural representation
Embodiment
A kind of imitative lotus leaf bar peripheral flow drag reduction test model, this model comprises: a support, as the carrier of imitative lotus leaf bar test model and other annexes; A pole, for fixing this test model to, in wind-tunnel or water hole, being connected with peripheral equipment simultaneously; A fixing pole, for fixing lotus leaf bar test model, and is connected with support by bolt; Three imitative lotus leaf bar test models, are bolted and are fixed between support and fixing pole, so that the drag-reduction effect of test lotus leaf bar test model and flow field, rear situation.
Now the invention will be further described by reference to the accompanying drawings:
As depicted in figs. 1 and 2, support 2 is fixed on wind-tunnel or water tunnel experiment intersegmental part by pole 1, support 2 two ends are designed to interior external diameter and are respectively �� 8 and the cylindrical structure of �� 12, the two ends of the through support 2 of pole 1, lower end is fixed by the first nut 4, spring washer 3 need to be added in being threaded, thus ensure the reliability that whole test model connects and in the stability flowed under impact. it is open type structure in the middle of support 2 upper end, and two ends are processed with step, for installing fixing pole 8, fixes and utilize bolt to be connected between pole 8 with support 2. fixing pole 8 is for fixing imitative lotus leaf bar test model 9 and smooth cylinder test model 12. as shown in Figure 5, peripheral flow test model 9 is identical with 12 structures, it is divided into thread segment 15, first step 14, 2nd step 16, middle section 18 and positioning section 17, middle section diameter of phi 8, for processing imitative lotus leaf bar microstructure, flow-field test concentrates on middle section 18, 2nd step 16 and positioning section 17 stream test model for positioning cylinder, positioning section 17 inserts the lower end of support 2, first step 14 is threaded connection with thread segment 15 and fixing pole 8 and is fixed on support 2, thread segment 15 runs through pilot hole 13 and is connected on fixing pole 8, it is threaded and need to add spring washer 3 10, to ensure the stable of peripheral flow test model. as shown in Figure 3 and Figure 4, this structure is the thorn of projection to the microstructure of imitative lotus leaf bar test model 9, by the shape of adjustment microstructure, size and density, thus realizes the optimization of drag-reduction effect. fixing support 8 and support 2 are processed with three pilot holes 13 respectively, for fixing a smooth cylinder test model 12 and two imitative lotus leaf bar test models 9. therefore, this model can test three peripheral flow test models simultaneously, improve test efficiency, and ensure that the consistence in different model flow field, it is to increase the accuracy of test result, during actually operating, also can according to the quantity of test increase in demand pilot hole 13, realize the disposable measurement of more multi-model, but should ensure that model spacing is greater than more than 5 times of section 18 diameter in the middle of model, prevent the mutual interference in flow field, peripheral flow test model back.
This imitative lotus leaf bar peripheral flow drag reduction test model is convenient to the installation and removal of cylinder model, and can the drag-reduction effect of the multiple model of one-shot measurement, greatly reduce cut-and-try work amount, improve test efficiency, also improve the different consistence of model experiment state and the accuracy of result simultaneously, be conducive to the contrast of test result and the assessment of drag-reduction effect. The microstructure imitating lotus leaf bar in body surface processing can realize drag reduction when not changing object profile, also can be found the microstructure of the most applicable peripheral flow drag reduction by this model experiment, overcome the deficiencies in the prior art, have a extensive future.
Claims (4)
1. an imitative lotus leaf bar peripheral flow drag reduction test model, it is characterised in that comprise pole (1), support (2), the first spring washer (3), the first nut (4), bolt (5), the 2nd spring washer (6), the 2nd nut (7), fixing pole (8), imitative lotus leaf bar test model (9), the 3rd spring washer (10), the 3rd nut (11), smooth cylinder test model (12) and pilot hole (13); The two ends of pole (1) through support (2), lower end is fixed by the first nut (4); It is open type structure in the middle of support (2) upper end, both sides are provided with step, fixing pole (8) is arranged on the step of support (2), both are connected by bolt (5), fixing pole (8) is provided with three pilot holes (13), fixing imitative lotus leaf bar test model (9) and smooth cylinder test model (12); Described imitative lotus leaf bar test model (9) is identical with smooth cylinder test model (12) structure, comprises thread segment (15), the first step (14), the 2nd step (16), middle section (18) and positioning section (17); The lower end of positioning section (17) insertion support (2), thread segment (15) runs through pilot hole (13) and is connected on fixing pole (8), thread segment upper end uses the 3rd nut (11) to fix, and centre adds pad the 3rd spring washer (10); The microstructure of described imitative lotus leaf bar test model (9) is the thorn of projection, by the shape of adjustment microstructure, size and density, it is achieved the optimization of drag-reduction effect.
2. the imitative lotus leaf bar peripheral flow drag reduction test model of one according to claim 1, it is characterised in that described support (2) two ends are that interior external diameter is respectively �� 8 and the cylindrical structure of �� 12.
3. the imitative lotus leaf bar peripheral flow drag reduction test model of one according to claim 1, it is characterised in that the diameter of described middle section (18) is �� 8.
4. the imitative lotus leaf bar peripheral flow drag reduction test model of one according to claim 1, it is characterized in that preventing the mutual interference in flow field, peripheral flow test model back by middle section (18) diameter that the spacing of adjacent imitative lotus leaf bar test model (9) or smooth cylinder test model (12) is greater than 5 times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410131097.XA CN103954429B (en) | 2014-04-02 | 2014-04-02 | A kind of imitative lotus leaf bar peripheral flow drag reduction test model |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410131097.XA CN103954429B (en) | 2014-04-02 | 2014-04-02 | A kind of imitative lotus leaf bar peripheral flow drag reduction test model |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103954429A CN103954429A (en) | 2014-07-30 |
| CN103954429B true CN103954429B (en) | 2016-06-08 |
Family
ID=51331734
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410131097.XA Expired - Fee Related CN103954429B (en) | 2014-04-02 | 2014-04-02 | A kind of imitative lotus leaf bar peripheral flow drag reduction test model |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103954429B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104880296B (en) * | 2015-06-23 | 2017-05-17 | 中国航空工业集团公司西安飞机设计研究所 | Method for measuring wind resistance of rake to be measured |
| CN105509996B (en) * | 2015-12-29 | 2017-12-26 | 西南石油大学 | A kind of marine riser streams the measure device and method of resistance coefficient and lift coefficient |
| CN106802227B (en) * | 2017-03-28 | 2023-07-21 | 吉林大学 | Bionic drag-reducing and noise-reducing flat plate device for rearview mirror wind tunnel experiment |
| CN107621351A (en) * | 2017-08-28 | 2018-01-23 | 江苏大学 | A kind of flow around bluff bodies experimental provision |
| CN108763718B (en) * | 2018-05-23 | 2020-08-14 | 西安交通大学 | Method for quickly predicting characteristic quantity of flow field when flow-around object and working condition change |
| CN113218617A (en) * | 2021-03-12 | 2021-08-06 | 浙江大学 | Multi-cylinder streaming experimental device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102226736A (en) * | 2011-04-11 | 2011-10-26 | 哈尔滨工程大学 | Testing apparatus for evaluating drag-reduction effects of bionic non-smooth surface and bionic jet surface |
| CN202033164U (en) * | 2011-01-12 | 2011-11-09 | 中国海洋石油总公司 | Testing device capable of simulating uniform-flow vortex-induced vibration of submarine pipeline |
| CN102279085A (en) * | 2011-05-31 | 2011-12-14 | 上海交通大学 | Simulation test device for vortex-induced vibration of deep-sea vertical pipe array model under conditions of uniform defluxion and pretension |
| CN103439080A (en) * | 2013-08-14 | 2013-12-11 | 广东省水利水电科学研究院 | Composite rod for simulating plants of different stiffnesses and wave attenuating model composed of same |
| CN103645030A (en) * | 2013-12-18 | 2014-03-19 | 哈尔滨工程大学 | Testing method and device for assessing drag reduction effect of bionic non-smooth surface revolution body wall |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3215586B2 (en) * | 1994-11-01 | 2001-10-09 | 興和精機株式会社 | Flow observation device |
-
2014
- 2014-04-02 CN CN201410131097.XA patent/CN103954429B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202033164U (en) * | 2011-01-12 | 2011-11-09 | 中国海洋石油总公司 | Testing device capable of simulating uniform-flow vortex-induced vibration of submarine pipeline |
| CN102226736A (en) * | 2011-04-11 | 2011-10-26 | 哈尔滨工程大学 | Testing apparatus for evaluating drag-reduction effects of bionic non-smooth surface and bionic jet surface |
| CN102279085A (en) * | 2011-05-31 | 2011-12-14 | 上海交通大学 | Simulation test device for vortex-induced vibration of deep-sea vertical pipe array model under conditions of uniform defluxion and pretension |
| CN103439080A (en) * | 2013-08-14 | 2013-12-11 | 广东省水利水电科学研究院 | Composite rod for simulating plants of different stiffnesses and wave attenuating model composed of same |
| CN103645030A (en) * | 2013-12-18 | 2014-03-19 | 哈尔滨工程大学 | Testing method and device for assessing drag reduction effect of bionic non-smooth surface revolution body wall |
Non-Patent Citations (2)
| Title |
|---|
| 具有非光滑表面的仿生减阻材料的研究简介;李光吉;《材料研究与应用》;20081231;第2卷(第4期);第455、458页 * |
| 多柱体***静止绕流与涡激振动的试验及数值研究;高洋洋;《中国博士学位论文全文数据库 基础科学辑》;20120215(第2期);第37、38页，图3-1、3-14 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103954429A (en) | 2014-07-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103954429B (en) | A kind of imitative lotus leaf bar peripheral flow drag reduction test model | |
| Ding et al. | Flow induced motion and energy harvesting of bluff bodies with different cross sections | |
| Lam et al. | Investigation of turbulent flow past a yawed wavy cylinder | |
| Lu et al. | Numerical investigation of fluid flow past circular cylinder with multiple control rods at low Reynolds number | |
| Saeedi et al. | Direct numerical simulation of turbulent wake behind a surface-mounted square cylinder | |
| Wu et al. | LES of flow around two staggered circular cylinders at a high subcritical Reynolds number of 1.4× 105 | |
| Hu et al. | Aerodynamic mechanisms of galloping of an inclined square cylinder | |
| Deng et al. | Three-dimensional transition after wake deflection behind a flapping foil | |
| Wang et al. | Numerical simulation with a TVD–FVM method for circular cylinder wake control by a fairing | |
| Lou et al. | Experimental investigation of the suppression of vortex induced vibration of two interfering risers with splitter plates | |
| Oruc | Strategies for the applications of flow control downstream of a bluff body | |
| Canpolat et al. | Influence of single rectangular groove on the flow past a circular cylinder | |
| Aranake et al. | Computational analysis of shrouded wind turbine configurations | |
| El Khoury et al. | Wakes behind a prolate spheroid in crossflow | |
| Ekmekci et al. | Control of flow past a circular cylinder via a spanwise surface wire: effect of the wire scale | |
| Chen et al. | CFD simulation of vortex-induced and wake-induced vibrations of dual vertical risers | |
| Cao et al. | Shear effects on flows past a square cylinder with rounded corners at Re= 2.2× 104 | |
| Li et al. | Proper orthogonal decomposition analysis of 3-D wake structures in a pitching-rolling plate | |
| Rinoshika et al. | Effect of a horizontal hole on flow structures around a wall-mounted low-aspect-ratio cylinder | |
| Zhang et al. | Effect of the bionic blade on the flow field of a straight-bladed vertical axis wind turbine | |
| Zhuang et al. | Numerical study of unsteady flows past a rotating wavy cylinder | |
| Liang et al. | Spanwise characteristics of flow crossing a yawed circular cylinder of finite length | |
| CN220204056U (en) | Hexagonal wind power tower tube turbulence bar | |
| CN206146622U (en) | Platform test device based on magnetic suspension principle | |
| Xue et al. | Flow dynamics of train under turbulent inflow at different crosswind yaw angles |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160608 Termination date: 20170402 |