CN103954429A - Lotus leaf stem imitative cylinder around flow drag reduction test model - Google Patents
Lotus leaf stem imitative cylinder around flow drag reduction test model Download PDFInfo
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- CN103954429A CN103954429A CN201410131097.XA CN201410131097A CN103954429A CN 103954429 A CN103954429 A CN 103954429A CN 201410131097 A CN201410131097 A CN 201410131097A CN 103954429 A CN103954429 A CN 103954429A
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Abstract
The invention relates to a lotus leaf stem imitative cylinder around flow drag reduction test model. The test model comprises a support, a supporting rod, a fixing supporting rod and three lotus leaf stem imitative test model bodies. The support is used as a carrier of the lotus leaf stem imitative test model bodies and other accessories, the supporting rod is used for fixing the test model into a wind tunnel or a water tunnel so as to be connected with an external device at the same time, the fixing supporting rod is used for fixing the lotus leaf stem test model bodies and connected with the support through bolts, and the three lotus leaf stem imitative test model bodies are connected and fixed between the support and the fixing supporting rod through bolts, so that the drag reduction effect of the lotus leaf stem imitative test model bodies and the condition of a flow field behind the lotus leaf stem imitative test model bodies are conveniently tested.
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 hydromechanical classical problem, is extensively present in scientific research and the engineering practice fields such as Aero-Space, construction work, hydraulic engineering, 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 of incoming flow one side.Feng Kamen in 1911 have studied the stability of two row vortex streets of peripheral flow generation theoretically, have after this caused that numerous scholars pay close attention to widely to circumferential motion problem.Increase along with Reynolds number, viscous incompressible fluid presents various flow state around the mobile meeting of cylinder, when Reynolds number is larger, wake flow is unstability first, occurs periodic swinging, then, along with whirlpool alternately comes off, spew out into wake flow and form Karman vortex street, along with the increase of Reynolds number, flowing becomes becomes increasingly complex, and finally develops into turbulent flow.Karman vortex street is phenomenon important in fluid mechanics, in daily life, the wind song of wind electric wire is because vortex-shedding causes, the resonance that in engineering, Karman vortex street causes also can damage equipment, the wind that is typically U.S.'s Tacoma bridge is ruined accident, in addition, coming off of whirlpool also can cause that equipment resistance increases, and causes very large threat for aspects such as stabilization of equipment performance and safety of structure.For the drag reduction streaming, be mainly by changing the method for equipment profile and material at present, mainly have the following disadvantages:
(1) in engineering application, for the strict demand of equipment profile and material, also must limit its design proposal, be unfavorable for the optimization of design proposal.
(2) for the specialized designs of profile and the extra cost of choosing meeting increase equipment of material, be unfavorable for the universal of peripheral flow drag reduction technology.
Summary of the invention
The technical matters solving
For fear of the deficiencies in the prior art part, the present invention proposes a kind of drag reduction test model that is specifically designed to peripheral flow, this model only need be processed in equipment surface the surface structure of difformity, size and spacing, thereby the drag-reduction effect of test different structure to peripheral flow, this model can increase substantially comparability and the accuracy of test result, reduce experimental work amount, improve conventional efficient.
Technical scheme
An imitative lotus leaf bar peripheral flow drag reduction test model, is characterized in that comprising pole 1, support 2, the first spring washer 3, the first nut 4, bolt 5, the second spring washer 6, the second nut 7, fixedly 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; Pole 1 connects the two ends of support 2, lower end is fixing by the first nut 4, support is open architecture in the middle of 2 upper ends, both sides are provided with step, fixedly pole 8 is arranged on the step of support 2, both connect by bolt 5, and fixedly 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 structures, comprises thread segment 15, first step 14, second step 16, interlude 18 and positioning section 17; Positioning section 17 inserts the lower end of supports 2, and thread segment 15 runs through pilot hole 13 and is connected to fixedly on pole 8, and thread segment upper end is used the 3rd nut 11 to fix, middle cushioning the 3rd spring washer 10.
Described support 2 two ends are the cylindrical structure that internal-and external diameter is respectively Φ 8 and Φ 12.
The diameter of described interlude 18 is Φ 8.
The thorn that the microstructure of described imitative lotus leaf bar test model 9 is projection, by regulating shape, size and the density of microstructure, realizes the optimization of drag-reduction effect.
Interlude 18 diameters that adjacent imitative lotus leaf bar test model 9 or the spacing of smooth cylinder test model 12 are greater than 5 times, prevent the phase mutual interference in flow field, peripheral flow test model back.
Beneficial effect
A kind of imitative lotus leaf bar peripheral flow drag reduction test model that the present invention proposes, tool has the following advantages:
1, adopt directly and design the method for one deck different size and spacing microstructure and test its drag-reduction effect at peripheral flow body surface, do not need to change profile and the material of object, overcome the deficiencies in the prior art, practicality, novelty are stronger, have a extensive future.
2, adopt separation design, be convenient to the installation and removal of peripheral flow test model, and bolt is connected with and is beneficial to the stability that strengthens model, make test result more accurate.
3, can test a smooth cylinder model and two peripheral flow drag reduction models simultaneously, greatly reduce experimental work amount, be conducive to improve testing efficiency; And in the time of a plurality of model, test has improved the consistance of different model experiment states and the accuracy of experimental study, is conducive to the contrast of test result and the assessment of drag-reduction effect.
Accompanying drawing explanation
Fig. 1 peripheral flow drag reduction of the present invention test model front view
1-pole, 2-support, 3-the first spring washer, 4-the first nut, 5-bolt, 6-the second spring washer, 7-the second nut, 8-be pole, the imitative lotus leaf bar test model of 9-, 10-the 3rd spring washer, 11-the 3rd nut, the smooth cylinder test model of 12-, 13-pilot hole fixedly
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 drawing in a place in Fig. 3 peripheral flow drag reduction test model front view
The imitative lotus leaf bar structure partial enlarged drawing in b place in Fig. 4 peripheral flow drag reduction test model front view
Fig. 5 peripheral flow test model structural representation
Embodiment
An 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 wind-tunnel or water hole, is connected with external unit 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 to support and fixedly between pole, so that drag-reduction effect and flow field, the rear situation of test lotus leaf bar test model.
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 by pole 1 or water hole experimental section is inner, support 2 two ends are designed to the cylindrical structure that internal-and external diameter is respectively Φ 8 and Φ 12, pole 1 connects the two ends of support 2, lower end is fixing by the first nut 4, the middle need that be threaded added spring washer 3, thereby guarantees reliability and the stability under incoming flow impacts that whole test model connects.Support 2 is open architecture in the middle of upper ends, and two ends are processed with step, for fixedly pole 8 is installed, fixedly between pole 8 and support 2, utilizes bolt to be connected.Fixedly 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, be divided into thread segment 15, first step 14, second step 16, interlude 18 and positioning section 17, interlude diameter of phi 8, be used for processing imitative lotus leaf bar microstructure, flow-field test concentrates on interlude 18, second step 16 and positioning section 17 stream test model for positioning cylinder, the lower end that positioning section 17 inserts support 2, first step 14 and thread segment 15 and fixedly pole 8 are threaded connection is fixed on support 2, thread segment 15 runs through pilot hole 13 and is connected to fixedly on pole 8, be threaded and need to add spring washer 3 10, to guarantee the stable of peripheral flow test model.As shown in Figure 3 and Figure 4, the thorn that this structure is projection, by regulating shape, size and the density of microstructure, thereby realizes the optimization of drag-reduction effect to the microstructure of imitative lotus leaf bar test model 9.On fixed support 8 and support 2, be processed with respectively three pilot holes 13, for fixing a smooth cylinder test model 12 and two imitative lotus leaf bar test models 9.Therefore, this model can be tested three peripheral flow test models simultaneously, improved testing efficiency, and guaranteed the consistance in different models flow field, improved the accuracy of test result, during practical operation, also can increase according to testing requirement the quantity of pilot hole 13, realize the more disposable measurement of multi-model, but should guarantee that model spacing is greater than the more than 5 times of model interlude 18 diameters, prevents the phase 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 drag-reduction effect that can a plurality of models of one-shot measurement, greatly reduced experimental work amount, improved testing efficiency, also improved the consistance of different model experiment states and the accuracy of result, be conducive to the contrast of test result and the assessment of drag-reduction effect simultaneously.Microstructure at the imitative lotus leaf bar of body surface processing can realize drag reduction in the situation that not changing object profile, by this model experiment, also can find the microstructure of the most applicable peripheral flow drag reduction, has overcome the deficiencies in the prior art, has a extensive future.
Claims (5)
1. an imitative lotus leaf bar peripheral flow drag reduction test model, is characterized in that comprising pole (1), support (2), the first spring washer (3), the first nut (4), bolt (5), the second spring washer (6), the second nut (7), fixedly 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); Pole (1) connects the two ends of support (2), and lower end is fixing by the first nut (4); In the middle of support (2) upper end, it is open architecture, both sides are provided with step, fixedly pole (8) is arranged on the step of support (2), both connect by bolt (5), fixedly 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), second step (16), interlude (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 to that fixedly pole (8) is upper, and thread segment upper end is used the 3rd nut (11) to fix, middle cushioning the 3rd spring washer (10).
2. a kind of imitative lotus leaf bar peripheral flow drag reduction test model according to claim 1, is characterized in that described support (2) two ends are the cylindrical structure that internal-and external diameter is respectively Φ 8 and Φ 12.
3. a kind of imitative lotus leaf bar peripheral flow drag reduction test model according to claim 1, is characterized in that the diameter of described interlude (18) is Φ 8.
4. a kind of imitative lotus leaf bar peripheral flow drag reduction test model according to claim 1, the thorn that the microstructure that it is characterized in that described imitative lotus leaf bar test model (9) is projection, by regulating shape, size and the density of microstructure, realize the optimization of drag-reduction effect.
5. a kind of imitative lotus leaf bar peripheral flow drag reduction test model according to claim 1, it is characterized in that interlude (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, prevent the phase mutual interference in flow field, peripheral flow test model back.
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Cited By (6)
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| CN104880296A (en) * | 2015-06-23 | 2015-09-02 | 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 |
| CN105509996A (en) * | 2015-12-29 | 2016-04-20 | 西南石油大学 | Device and method for measuring resistance coefficient and lift coefficient of flow around marine riser |
| CN106802227A (en) * | 2017-03-28 | 2017-06-06 | 吉林大学 | A kind of bionic, drag-reducing noise reduction board 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 |
| CN108763718A (en) * | 2018-05-23 | 2018-11-06 | 西安交通大学 | The method for quick predicting of Field Characteristics amount when streaming object and operating mode change |
| CN113218617A (en) * | 2021-03-12 | 2021-08-06 | 浙江大学 | Multi-cylinder streaming experimental device |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104880296A (en) * | 2015-06-23 | 2015-09-02 | 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 |
| 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 |
| CN105509996A (en) * | 2015-12-29 | 2016-04-20 | 西南石油大学 | Device and method for measuring resistance coefficient and lift coefficient of flow around marine riser |
| 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 |
| CN106802227A (en) * | 2017-03-28 | 2017-06-06 | 吉林大学 | A kind of bionic, drag-reducing noise reduction board 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 |
| CN108763718A (en) * | 2018-05-23 | 2018-11-06 | 西安交通大学 | The method for quick predicting of Field Characteristics amount when streaming object and operating mode change |
| 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 |
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