CN103821801A - Resistance reducing rib - Google Patents

Resistance reducing rib Download PDF

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CN103821801A
CN103821801A CN201410061037.5A CN201410061037A CN103821801A CN 103821801 A CN103821801 A CN 103821801A CN 201410061037 A CN201410061037 A CN 201410061037A CN 103821801 A CN103821801 A CN 103821801A
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rib
structure according
drag reducing
drag
height
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CN103821801B (en
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张明明
刘志丰
徐建中
王国付
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Institute of Engineering Thermophysics of CAS
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Abstract

本发明提出了一种新型减阻肋条结构，在传统的肋条顶点尖角处增加一段刀刃型肋条，结合刀刃型肋条减阻性能高、不受加工圆角影响的优点，亦能考虑到加工难度、提高结构强度。通过合理选择肋条截面的尺寸参数（肋条高度，夹角，刀刃厚度、高度等），影响边界层流动结构（增加黏性底层厚度、限制流向涡的展向运动等），从而实现减阻目的，可用于减少飞行器、水下航行器以及地面交通工具的表面摩擦阻力，具有广泛的应用前景。

The present invention proposes a new type of drag-reducing rib structure, adding a section of blade-shaped rib at the sharp corner of the traditional rib apex, combined with the advantages of high drag-reducing performance of the blade-type rib and not being affected by processing rounded corners, it can also take into account the difficulty of processing , Improve structural strength. By reasonably selecting the size parameters of the rib section (rib height, angle, blade thickness, height, etc.), affecting the boundary layer flow structure (increasing the thickness of the viscous bottom layer, restricting the spanwise movement of the flow direction vortex, etc.), so as to achieve the purpose of drag reduction, It can be used to reduce the surface frictional resistance of aircraft, underwater vehicles and ground vehicles, and has wide application prospects.

Description

A kind of drag reduction rib
Technical field
The present invention relates to a kind of improved drag reduction by riblets device, reach to change boundary layer flow the effect that reduces frictional resistance by being applied to stream body surface, can be applicable to the fields such as the interior stream of Aeronautics and Astronautics, navigation, traffic above-ground and pipeline.
Background technique
Rib Technology origin is in shark placoid scale rib structure, and this biomimetic features is proved to have very strong practicability and good drag-reduction effect by a large amount of research work.In prior art, think that the rib with drag reduction effect must have sharp keen peak ridge and spacing and low speed striation widths and have certain relation, that is, work as h +≤ 25 and s +≤ 30(
Figure BDA0000468559760000011
see Fig. 1, h is rib heights, and s is rib spacing, and υ is kinematical viscosity, u τfriction velocity, τ wbe wall shearing stress, ρ is flowing medium density, and subscript "+" represents with the parameter of wall unit's nondimensionalization, lower with) time there is property of reduction drag, s +=h +=15, it is 8% that drag reduction reaches maximum value.Testing what can find to have best property of reduction drag by the rib to different cross section (comprising triangle, rectangle, V-arrangement, semicircle etc.) is triangle section rib.Tooth shape, V font and trapezoidal rib (see figure 1) are tested to contrast, show that tooth shape has the highest drag reduction efficiency, can drag reduction 9.9%, be secondly trapezoidal rib, drag reduction 8.2%, V font only has 5.1%.
Traditional triangle cross section drag reduction by riblets effect is limited and be subject to the impact of peak ridge fillet, though sword type rib drag-reduction effect is more excellent, be not subject to the impact of rib point processing fillet, but thickness thin rib (t=0.02s) like this is difficult to processing, structural strength is not good, destructible in practical application.Above-mentioned rib structure of the prior art has seriously limited the practical application of drag reduction by riblets technology.
Summary of the invention
Consider the advantages and disadvantages part of prior art, the present invention proposes a kind of new drag reduction rib, its innovation is the advantage in conjunction with traditional triangle rib stability aspect, with the outstanding resistance reducing performance of blade rib and the advantage that not affected by rib sharp apex fillet, at triangle section rib point, place increases by one section of blade rib, high in conjunction with blade type drag reduction by riblets performance, do not processed the advantage that fillet affects, also consider difficulty of processing, guarantee the factor of structural strength, rib structure is streamed to body surface (as wing etc.) by reasonable manner following current to being arranged in, by the dimensional parameters (rib heights in choose reasonable rib cross section, angle, thickness of knife edge, height etc.), and then affect boundary layer flow structure and (increase viscous sublayer thickness, restriction flows to the exhibition in whirlpool to motion), strengthen its drag-reduction effect.
The technical solution adopted for the present invention to solve the technical problems: a kind of drag reduction rib structure, comprise substrate, rib crest and rib trough, following current is streamed body surface to being arranged in, it is characterized in that, described in adjacent two, the peak-to-peak space segment of rib ripple forms rib trough, described in each, rib crest comprises two side and a top boss, described top boss is a columnar protrusions upwards stretching perpendicular to base plane along the summit edge line of described two side, the top of this columnar protrusions is a plane, the angle of described two side and described base plane is basic identical, the cross section of described columnar protrusions is substantially rectangular, the setting party of described rib crest and rib trough is to basic identical with the described flow direction that streams body surface, and rib distance s and rib heights h with described in stream body surface the vortex structure yardstick that flows to be same magnitude substantially, wherein, described rib distance s refer to adjacent two described in the peak-to-peak distance of rib ripple, described rib heights h refers to the distance the top planes from described base plane to described top boss.
Preferably, the summit edge line of described top boss can be processed with knuckle or transition chamfering.
Preferably, the bottom surface of described rib trough is flat structures.
Preferably, described rib trough is V-structure.
Preferably, described in each, the angle between the two side of rib crest is about 60 °.
Preferably, the angle between the two side of described rib trough is about 60 °.
Preferably, described rib distance s and rib heights h and wall flow, to the same magnitude of vortex structure yardstick, are generally about 15 wall units.Preferably, the thickness t of described top boss is generally about 0.3 wall unit.
Preferably, the height of described top boss and the ratio of rib heights are about 0.1-0.5.
Preferably, drag reduction rib structure of the present invention, can be applicable to airframe, wing, wing flap etc.
Preferably, drag reduction rib structure of the present invention, can be applicable to hull, submarine etc.
Preferably, drag reduction rib structure of the present invention, can be applicable to the internal surface of fluid line.
Preferably, drag reduction rib structure of the present invention, can and stream body surface by bonding mode and connect firmly.
Preferably, drag reduction rib structure of the present invention, can be by forming in the mode of streaming the direct processing of body surface.
Wall unit of the present invention is υ/u τ, wherein: υ is flowing medium kinematical viscosity,
Figure BDA0000468559760000031
be friction velocity, ρ is flowing medium density, τ wit is wall shearing stress.
Drag reduction rib structure of the present invention is a kind of novel drag reduction by riblets technology, have advantages of outstanding than traditional drag reduction rib structure: the advantage that combines the advantage of traditional triangle rib stability aspect and the outstanding resistance reducing performance of blade rib and not affected by rib sharp apex fillet, at triangle section rib point, place increases by one section of blade rib, high in conjunction with blade type drag reduction by riblets performance, do not processed the advantage that fillet affects, also consider difficulty of processing, guarantee the factor of structural strength, rib structure is streamed to body surface (as wing etc.) by reasonable manner following current to being arranged in, by the dimensional parameters (rib heights in choose reasonable rib cross section, angle, thickness of knife edge, height etc.), and then affect boundary layer flow structure and (increase viscous sublayer thickness, restriction flows to the exhibition in whirlpool to motion), strengthen its drag-reduction effect.
Accompanying drawing explanation
Fig. 1 is conventional rib schematic cross-section, and wherein Fig. 1 a is the conventional rib in V-arrangement cross section, the conventional rib that Fig. 1 b is trapezoid cross section, and Fig. 1 c is the conventional rib in tooth shape cross section;
Fig. 2 is the schematic cross-section of drag reduction rib structure of the present invention perpendicular to the flow direction, and its rib trough is V-structure;
Fig. 3 is the schematic cross-section of drag reduction rib structure of the present invention perpendicular to the flow direction, and the bottom surface of its rib trough is flat structures;
Fig. 4 is the axonometric drawing of drag reduction rib structure of the present invention, and its rib trough is V-structure;
Fig. 5 is the axonometric drawing of drag reduction rib structure of the present invention, and the bottom surface of its rib trough is flat structures;
Fig. 6 is that drag reduction rib structure of the present invention adheres to the schematic diagram that streams body surface.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, and following examples are explanation of the invention and the present invention is not limited to following examples.
As shown in Figures 2 to 5, drag reduction rib structure of the present invention, comprise substrate 1, rib crest 2 and rib trough 3, following current is streamed body surface to being arranged in, space segment described in adjacent two between rib crest 1 forms rib trough 2, described in each, rib crest 1 comprises two side 11 and a top boss 12, described top boss 12 is the columnar protrusions that a summit edge line along described two side 11 upwards stretches perpendicular to base plane 1, the top of this columnar protrusions is a plane, described two side 11 is basic identical with the angle of described base plane 1, the cross section of described columnar protrusions is substantially rectangular, the setting party of described rib crest 2 and rib trough 3 is to basic identical with the described flow direction that streams body surface, and rib distance s and rib heights h with described in stream body surface the vortex structure yardstick that flows to be same magnitude substantially, wherein, described rib distance s refers to the distance between rib crest 2 described in adjacent two, and described rib heights h refers to from described base plane 1 to the distance the top planes of described top boss 12.
Preferably, the summit edge line of described top boss 12 can be processed with knuckle or transition chamfering.Preferably, the bottom surface of described rib trough 3 is flat structures or V-structure.
Preferably, described in each, the angle between the two side of rib crest is about 60 °.Preferably, the angle between the two side of described rib trough is about 60 °.
Preferably, described rib distance s and rib heights h and wall flow, to the same magnitude of vortex structure yardstick, are generally about 15 wall units.Preferably, the thickness t of described top boss is generally about 0.3 wall unit.Preferably, the ratio of the height of described top boss and rib heights h is about 0.1-0.5.
Preferably, drag reduction rib structure of the present invention, can be applicable to airframe, wing, wing flap etc., or is applied to hull, submarine etc., or be applied to the internal surface of fluid line.Preferably, drag reduction rib structure of the present invention, can and stream body surface by bonding mode and connect firmly, or by forming in the mode of streaming the direct processing of body surface.
As shown in Figure 6, drag reduction rib structure of the present invention can be made fexible film and adheres to and stream body surface.Airflow passes stream the following current of arranging on body surface to rib, because rib structure has increased the thickness of boundary layer viscous sublayer, reduce the average velocity gradient on wall, rib spike has hindered the generation of the instantaneous lateral flow being caused by turbulent motion, weaken transporting of wall turbulence momentum, the surface friction drag of rib surface is reduced.
In addition, it should be noted that, the specific embodiment described in this specification, shape, institute's title of being named etc. of its parts and components can be different.All equivalence or simple change of doing according to described structure, feature and the principle of patent design of the present invention, are included in the protection domain of patent of the present invention.Those skilled in the art can make various modifications or supplement or adopt similar mode to substitute described specific embodiment; only otherwise depart from structure of the present invention or surmount this scope as defined in the claims, all should belong to protection scope of the present invention.

Claims (10)

1.一种减阻肋条结构，包括基底、肋条波峰和肋条波谷，顺流向布置在绕流物体表面，其特征在于，相邻两所述肋条波峰之间的空间部分形成肋条波谷，每一所述肋条波峰包括两侧壁和一顶部突起，所述顶部突起为一沿着所述两侧壁的顶点边缘线垂直于基底平面向上拉伸的柱状突起，该柱状突起的顶部为一平面，所述两侧壁与所述基底平面的夹角基本相同，所述柱状突起的横截面基本呈矩形；所述肋条波峰和肋条波谷的设置方向与所述绕流物体表面的流体方向基本相同，且肋条间距s和肋条高度h与所述绕流物体表面的流向涡结构尺度基本为同一量级，其中，所述肋条间距s是指相邻两所述肋条波峰之间的距离，所述肋条高度h是指从所述基底平面到所述顶部突起的顶部平面之间的距离。1. A drag-reducing rib structure, comprising a base, rib crests and rib troughs, arranged along the flow direction on the surface of the object around the flow, characterized in that the space between two adjacent rib crests forms a rib trough, each The rib crest includes two side walls and a top protrusion, the top protrusion is a columnar protrusion stretching upward along the apex edge line of the two side walls perpendicular to the base plane, and the top of the columnar protrusion is a plane, so The included angles between the two side walls and the base plane are basically the same, and the cross-section of the columnar protrusion is basically rectangular; the arrangement direction of the rib crests and rib troughs is basically the same as the fluid direction on the surface of the flow-around object, and The rib spacing s and the rib height h are basically on the same order of magnitude as the flow direction vortex structure scale on the surface of the flowing object, wherein the rib spacing s refers to the distance between two adjacent rib peaks, and the rib height h refers to the distance from the base plane to the top plane of the top protrusion. 2.根据权利要求1所述的减阻肋条结构，其特征是，所述顶部突起的顶点边缘线可以加工有过渡圆角或过渡倒角。2 . The drag reducing rib structure according to claim 1 , wherein the apex edge line of the top protrusion can be processed with transition fillets or transition chamfers. 3 . 3.根据权利要求1所述的减阻肋条结构，其特征是，所述肋条波谷的底面为平坦结构。3. The drag reducing rib structure according to claim 1, wherein the bottom surface of the rib trough is a flat structure. 4.根据权利要求1所述的减阻肋条结构，其特征是，所述肋条波谷为V型结构。4. The drag reducing rib structure according to claim 1, characterized in that, the trough of the rib is a V-shaped structure. 5.根据权利要求1至4所述的减阻肋条结构，其特征是，每一所述肋条波峰的两侧壁之间的夹角约为60°。5. The drag reducing rib structure according to claims 1 to 4, wherein the angle between the two side walls of each rib crest is about 60°. 6.根据权利要求1至5所述的减阻肋条结构，其特征是，所述肋条波谷的两侧壁之间的夹角约为60°。6. The drag reducing rib structure according to claims 1 to 5, wherein the angle between the two side walls of the rib trough is about 60°. 7.根据权利要求1至5所述的减阻肋条结构，其特征是，所述肋条间距s和肋条高度h与壁面流向涡结构尺度同量级，一般约为15个壁面单位,所述顶部突起的厚度t一般约为0.3个壁面单位，其中：所述壁面单位为υ/uτ，υ是流体介质运动粘度，
Figure FDA0000468559750000021
是摩擦速度，ρ为流体介质密度,τw是壁面剪切应力。7. The drag reducing rib structure according to claims 1 to 5, characterized in that, the rib spacing s and rib height h are of the same order as the scale of the wall flow direction vortex structure, generally about 15 wall units, and the top The thickness t of the protrusion is generally about 0.3 wall units, wherein: the wall unit is υ/u τ , υ is the kinematic viscosity of the fluid medium,
Figure FDA0000468559750000021
is the friction velocity, ρ is the fluid medium density, and τ w is the wall shear stress. 8.根据权利要求1至5所述的减阻肋条结构，其特征是，所述顶部突起的高度和肋条高度的比值约为0.1-0.5。8. The drag reducing rib structure according to claims 1 to 5, wherein the ratio of the height of the top protrusion to the height of the rib is about 0.1-0.5. 9.根据权利要求1至5所述的减阻肋条结构，其特征是，可通过粘接的方式与绕流物体表面固联，或可通过在绕流物体表面直接加工的方式形成。9. The drag reducing rib structure according to claims 1 to 5, characterized in that it can be fixedly connected to the surface of the object around the flow by bonding, or can be formed by direct processing on the surface of the object around the flow. 10.根据权利要求1至5所述的减阻肋条结构，其特征是，所述减阻肋条结构，可应用于飞机机身、机翼、襟翼等，或船体、潜艇等，或流体管道的内表面。10. The drag reducing rib structure according to claims 1 to 5, characterized in that the drag reducing rib structure can be applied to aircraft fuselages, wings, flaps, etc., or hulls, submarines, etc., or fluid pipelines inner surface.
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CN105644770A (en) * 2015-12-30 2016-06-08 哈尔滨工业大学 Sharkskin-imitating resistance-reducing wing
CN108999846A (en) * 2018-08-14 2018-12-14 中国科学院工程热物理研究所 A kind of super-hydrophobic drag reduction rib structure
CN110939712A (en) * 2019-12-17 2020-03-31 合肥工业大学 Shark bionic gear
CN111336162A (en) * 2020-03-25 2020-06-26 中国科学院国家空间科学中心 Device for converting space directional flow direction to balanced flow
WO2020151379A1 (en) * 2019-01-24 2020-07-30 深圳大学 Unmanned aerial vehicle rotor surface microstructure drag-reducing film and manufacturing method thereof
CN111611661A (en) * 2020-05-26 2020-09-01 北京航空航天大学 A transverse V-groove structure based on stable vortex string drag reduction and its application
CN112548359A (en) * 2020-11-30 2021-03-26 贵州大学 Preparation method of surface functional composite structured monocrystalline silicon carbide
CN113665728A (en) * 2021-09-14 2021-11-19 中国海洋大学 Bionic drag reduction method for underwater vehicle and water surface ship
CN113983266A (en) * 2021-12-03 2022-01-28 中铁建电气化局集团第一工程有限公司 Resistance-reducing elbow device based on V-shaped groove flow guide grid sheet
CN115258033A (en) * 2022-08-03 2022-11-01 青岛科技大学 Micro-groove bionic drag reduction structure and preparation method thereof

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Publication number Priority date Publication date Assignee Title
CN105644770A (en) * 2015-12-30 2016-06-08 哈尔滨工业大学 Sharkskin-imitating resistance-reducing wing
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CN108999846B (en) * 2018-08-14 2023-09-19 中国科学院工程热物理研究所 Super-hydrophobic drag reduction rib structure
WO2020151379A1 (en) * 2019-01-24 2020-07-30 深圳大学 Unmanned aerial vehicle rotor surface microstructure drag-reducing film and manufacturing method thereof
CN110939712A (en) * 2019-12-17 2020-03-31 合肥工业大学 Shark bionic gear
CN111336162A (en) * 2020-03-25 2020-06-26 中国科学院国家空间科学中心 Device for converting space directional flow direction to balanced flow
CN111611661A (en) * 2020-05-26 2020-09-01 北京航空航天大学 A transverse V-groove structure based on stable vortex string drag reduction and its application
CN112548359A (en) * 2020-11-30 2021-03-26 贵州大学 Preparation method of surface functional composite structured monocrystalline silicon carbide
CN113665728A (en) * 2021-09-14 2021-11-19 中国海洋大学 Bionic drag reduction method for underwater vehicle and water surface ship
CN113983266A (en) * 2021-12-03 2022-01-28 中铁建电气化局集团第一工程有限公司 Resistance-reducing elbow device based on V-shaped groove flow guide grid sheet
CN115258033A (en) * 2022-08-03 2022-11-01 青岛科技大学 Micro-groove bionic drag reduction structure and preparation method thereof
CN115258033B (en) * 2022-08-03 2023-09-15 青岛科技大学 A micro-groove bionic drag reduction structure and its preparation method

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