CN219262567U - Bionic fish fin type vortex generator and blade comprising same - Google Patents
Bionic fish fin type vortex generator and blade comprising same Download PDFInfo
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- CN219262567U CN219262567U CN202320596528.4U CN202320596528U CN219262567U CN 219262567 U CN219262567 U CN 219262567U CN 202320596528 U CN202320596528 U CN 202320596528U CN 219262567 U CN219262567 U CN 219262567U
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Abstract
The utility model belongs to the technical field of vortex generators, and in particular relates to a bionic fish fin type vortex generator and a blade comprising the same, wherein the bionic fish fin type vortex generator comprises a base plate and two symmetrically arranged wing profiles, and the base plate is connected with a blade body; each wing section comprises an upper wing plate and a lower wing plate which are connected, wherein the upper wing plate and the lower wing plate are triangular plates; the thickness and the length of the upper wing plate are smaller than those of the lower wing plate; a notch is prefabricated on one side of the lower wing plate connected with the base plate; the trailing edge of the upper wing plate forms a first wing tip and the trailing edge of the lower wing plate forms a second wing tip. By designing two wingtips to generate two wingtip vortexes, the generated vorticity and the generated vorticity strength are increased, the capacity of further inhibiting the phenomena of airflow separation and stall is further improved, and particularly when the attack angle is large, the problem of airflow separation still exists even if a conventional vortex generator is installed.
Description
Technical Field
The utility model belongs to the technical field of vortex generators, and particularly relates to a bionic fish fin type vortex generator and a blade comprising the same.
Background
The development trend of the large-capacity and long and flexible blades of the wind turbine generator is increasingly accelerated, and the wind turbine generator is influenced by the restriction factors such as the inertia increase, control delay, blade pneumatic and structural design characteristics and the like of the wind turbine, so that the airflow separation phenomenon on the surface of the blades is more remarkable. In addition, as the service life increases, the influence of dirt, spot/corrosion damage and the like on the surface of the blade increases the roughness of the front edge of the blade, airflow enters a transition state or a stall state in advance when flowing through the surface of the blade, so that the lift force of the blade is rapidly reduced, the resistance is greatly increased, and the generating capacity loss of the unit is gradually increased. As a pneumatic power-increasing and drag-reducing accessory with higher cost performance, the vortex generator is discovered and proposed by Taylor for the first time in 1947, can effectively delay the boundary layer separation of an airplane wing, and then the vortex generator is gradually and deeply researched along with wind tunnel experiments and numerical simulation technology to flow control mechanisms of the vortex generator, so that the vortex generator is increasingly applied to the fields of aerospace, wind turbines and the like. The vortex generator can generate relative vortex at the wing tip, and the intensity and the energy are higher, so that the boundary layer flow field in the reverse pressure gradient can continue to flow along the wing surface of the blade after additional energy is obtained, and the phenomenon of airflow separation does not occur or is delayed.
While the conventional vortex generator can play a role in inhibiting airflow separation and delaying stall, the conventional vortex generator still has obvious airflow separation and stall phenomena when the wing section has a large attack angle, the air density is low and the turbulence is large.
Disclosure of Invention
The utility model aims to provide a bionic fish fin type vortex generator and a blade comprising the same, which solve the problems that when the wing profile is large in attack angle, low in air density and large in turbulence, obvious airflow separation and stall phenomena still exist.
The utility model is realized by the following technical scheme:
a bionic fish fin type vortex generator comprises a base plate and two wing profiles which are symmetrically arranged, wherein the base plate is connected with a blade body; each wing section comprises an upper wing plate and a lower wing plate which are connected, wherein the upper wing plate and the lower wing plate are triangular plates;
the thickness and the length of the upper wing plate are smaller than those of the lower wing plate;
a notch is prefabricated on one side of the lower wing plate connected with the base plate;
the trailing edge of the upper wing plate forms a first wing tip and the trailing edge of the lower wing plate forms a second wing tip.
Further, the airfoil has a leading edge mounting start position at a distance X from the apex of the leading edge of the blade body, x=t x * c, wherein T x And c is the chord length of the blade body for the relative transition position.
Further, the distance between the first wing tip and the second wing tip is L1,0< L1<0.5L; l is the length of the lower wing plate.
Further, the length of the lower wing plate is L, the height of the wing profile is h1, l=2×h1 to 4×h1.
Further, the height of the wing profile is h1, the interval between the front edge openings of the two wing profiles is D, the interval between the rear edge openings is D, d=h1-3×h1, and d=2×h1-4×h1;
the included angle formed by the wing profile and the central line of the base plate is theta, and theta=15-25 degrees.
Further, the thickness of the first wing tip is f,0<f is less than or equal to e, and e is the maximum thickness of the lower wing plate.
Further, the airfoil has a height h1;
the second wing tip has a height h2,0< h2< h1.
Further, the bionic fin type vortex generator is formed by casting a die or is manufactured by 3D printing.
Further, the base plate is bonded to the blade body.
The blade is characterized in that at least one bionic fin type vortex generator is arranged on the blade body, the center distance delta D of adjacent bionic fin type vortex generators is equal to 2 x h 1-10 x h1, and h1 is the height of an airfoil.
Compared with the prior art, the utility model has the following beneficial technical effects:
the utility model provides a bionic fish fin type vortex generator which comprises a base plate and two wing profiles which are symmetrically arranged, wherein the base plate is connected with a blade body; each wing section comprises an upper wing plate and a lower wing plate which are connected, wherein the upper wing plate and the lower wing plate are triangular plates, the tail edge of the upper wing plate forms a first wing tip, and the tail edge of the lower wing plate forms a second wing tip. Compared with a conventional single-wingtip vortex generator, the two wingtips are designed to generate two wingtip vortices, so that the generated vorticity and the generated vorticity strength are increased, the capability of further inhibiting airflow separation and stall phenomena is improved, and particularly when the conventional single-wingtip vortex generator is installed at a larger attack angle, the problem of airflow separation still exists; and the first wing tip is thinner, so that aerodynamic resistance generated after the vortex generator is additionally arranged can be reduced.
Drawings
FIG. 1 is a schematic diagram of an installation of a simulated fin vortex generator;
FIG. 2 is a schematic diagram of the installation position of the simulated fin vortex generator;
FIG. 3 is a schematic perspective view of a fin-like vortex generator;
FIG. 4 is a schematic diagram of various dimensions of a simulated fin vortex generator;
FIG. 5 is a graph of simulated fish fin vortex generator surface pressure;
fig. 6 is a flow velocity cloud of an airfoil with a conventional vortex generator installed at an angle of attack α=12°;
fig. 7 is an airfoil flow velocity cloud diagram of a bionic fish fin vortex generator of the present utility model installed at an angle of attack α=12°;
1, a substrate; 2. an upper wing plate; 3. a lower wing plate; 4. a first wingtip; 5. a second wingtip; 6. a blade body.
Detailed Description
The objects, technical solutions and advantages of the present utility model will be more apparent from the following detailed description with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the utility model, i.e., the embodiments described are merely some, but not all, of the embodiments of the utility model.
The components illustrated in the figures and described and shown in the embodiments of the utility model may be arranged and designed in a wide variety of different configurations, and thus the detailed description of the embodiments of the utility model provided in the figures below is not intended to limit the scope of the utility model as claimed, but is merely representative of selected ones of the embodiments of the utility model. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present utility model, based on the figures and embodiments of the present utility model.
It should be noted that: the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, element, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, element, method, article, or apparatus.
The features and properties of the present utility model are described in further detail below with reference to examples.
As shown in fig. 1, a bionic fin type vortex generator is mounted on the blade body 6.
As shown in fig. 3, the utility model discloses a bionic fish fin type vortex generator, which comprises a base plate 1 and two symmetrically arranged wing profiles, wherein the base plate 1 is connected with a blade body 6; each airfoil comprises an upper wing plate 2 and a lower wing plate 3 which are connected, wherein the upper wing plate 2 and the lower wing plate 3 are triangular plates; the thickness and the length of the upper wing plate 2 are smaller than those of the lower wing plate 3; a notch is prefabricated on one side of the lower wing plate 3 connected with the base plate 1; the trailing edge of the upper wing panel 2 forms a first wing tip 4 and the trailing edge of the lower wing panel 3 forms a second wing tip 5.
As shown in fig. 2, the airfoil leading edge mounting start position is mounted in the trailing edge direction at a distance X from the apex of the leading edge of the blade body 6; the method for determining the X value comprises the following two steps:
s1, calculating an attack angle alpha corresponding to the optimal lift-drag ratio of the wing profile at the position of the blade body 6;
s2, calculating aerodynamic performance of the airfoil under the attack angle alpha by using Rfoil software to obtain a relative transition position T x ，x＝T x * c, wherein c is the chord length of the blade body 6.
The dimensions of the bionic fish fin vortex generator are shown in fig. 4, wherein the distance from the second wing tip 5 to the first wing tip 4 is L1,0< L1<0.5L as shown in fig. 4 d.
As shown in fig. 4b, the first wing tip 4 has a thickness f,0<f is less than or equal to e, e is the maximum thickness of the lower wing plate 3, and e=1 mm-3 mm; the overall height of the airfoil is h 1 ，20mm≤h 1 Less than or equal to 50mm, the height of the second wing tip 5 is h 2 ，0<h 2 <h 1 。
As shown in fig. 4a, the airfoil has a length L, l= 2*h 1 ～4*h 1 Leading edge opening spacing d=h 1 ～3*h 1 Trailing edge opening spacing d= 2*h 1 ～4*h 1 Slope θ=15° to 25 °.
As shown in fig. 4a, the distance between the airfoil leading edge and the leading edge of the base plate 1 is lx, lx >0mm; the distance between the edge position corresponding to the opening on the lower wing plate 3 and the rear edge of the base plate 1 is ly, and ly is more than 0mm; as shown in fig. 4d, the distance between the outer edge of the airfoil and the side edge of the base plate 1 is sx, sx >0mm.
As shown in fig. 4c, the width of the front edge of the substrate 1 is Dx, the width of the rear edge of the substrate 1 is Dx, the front edge opening spacing of two airfoils is D, and the rear edge opening spacing is D, dx > D.
The bionic fin type vortex generator can be used for pouring a mould in a hot runner or other similar forms, and can also be manufactured by 3D printing; the bionic fin type vortex generator material is made of ultraviolet-resistant and illumination-resistant thermoplastic materials.
The bionic fish fin type vortex generator can be selectively and singly arranged on the surface of the blade, and can be integrally arranged on a plurality of vortex generatorsPackaging, wherein the integrated length is not more than 40cm; center distance delta D= 2*h between adjacent fin-like vortex generators 1 ～10*h 1 。
The substrate 1 and the blade surface mounting medium need to be quick two-component structural adhesive or other structural adhesives.
The overall dimension is subjected to CFD detailed calculation, and is suitable for airfoils and variants thereof such as a main stream DU series, a NACA series, a Riso series, an S series, an FFA series and the like of the wind turbine generator.
As shown in fig. 5, a large pressure gradient exists in the wingtip region, which tends to generate wingtip vortex shedding and suppresses occurrence of airflow separation.
As shown in fig. 6, when the attack angle α=12°, after a conventional vortex generator is installed on an airfoil with a thickness of 40%, the airflow separation phenomenon still occurs at the position of the airfoil close to the trailing edge, and the corresponding lift coefficient 1.509 and drag coefficient 0.028 are obtained; as shown in fig. 7, after the bionic fin type vortex generator is replaced at the same installation position, the air flow separation phenomenon is not seen on the surface of the airfoil, the corresponding lift coefficient is 1.528 and the drag coefficient is 0.0266, the corresponding lift coefficient is increased by 1.26%, and the drag coefficient is reduced by 5%.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the utility model without departing from the spirit and scope of the utility model, which is intended to be covered by the claims.
Claims (10)
1. The bionic fish fin type vortex generator is characterized by comprising a base plate (1) and two wing profiles which are symmetrically arranged, wherein the base plate (1) is connected with a blade body (6); each wing section comprises an upper wing plate (2) and a lower wing plate (3) which are connected, wherein the upper wing plate (2) and the lower wing plate (3) are triangular plates;
the thickness and the length of the upper wing plate (2) are smaller than those of the lower wing plate (3);
a notch is prefabricated on one side of the lower wing plate (3) connected with the base plate (1);
the tail edge of the upper wing plate (2) forms a first wing tip (4), and the tail edge of the lower wing plate (3) forms a second wing tip (5).
2. A bionic fish fin type vortex generator according to claim 1, wherein the front edge mounting start position of the airfoil is at a distance X from the front edge apex of the blade body (6), X = T x * c, wherein T x And c is the chord length of the blade body (6) for the relative transition position.
3. A bionic fish fin vortex generator according to claim 1, characterized in that the distance of the first wing tip (4) from the second wing tip (5) is L1,0< L1<0.5L; l is the length of the lower wing plate (3).
4. The bionic fish fin type vortex generator according to claim 1, wherein the length of the lower wing plate (3) is L, the height of the wing profile is h1, l=2xh1 to 4xh1.
5. The bionic fish fin type vortex generator according to claim 1, wherein the height of the wing profile is h1, the spacing between the front edge openings of the two wing profiles is D, the spacing between the rear edge openings is D, d=h1 to 3×h1, and d=2×h1 to 4×h1;
the included angle formed by the wing section and the central line of the base plate (1) is theta, and theta=15-25 degrees.
6. The bionic fish fin type vortex generator according to claim 1, wherein the thickness of the first wing tip (4) is f, 0<f-e, and e is the maximum thickness of the lower wing plate (3).
7. The bionic fish fin type vortex generator according to claim 1, wherein the height of the airfoil is h1;
the second wing tip (5) has a height h2,0< h2< h1.
8. The bionic fin-shaped vortex generator of claim 1, wherein the bionic fin-shaped vortex generator is cast with a mold or manufactured by 3D printing.
9. A bionic fish fin vortex generator according to claim 1, characterized in that the base plate (1) is glued to the blade body (6).
10. A blade, characterized in that at least one bionic fin type vortex generator according to any one of claims 1-9 is mounted on the blade body (6), the center distance Δd=2×h1-10×h1 of adjacent bionic fin type vortex generators, h1 is the height of the airfoil profile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320596528.4U CN219262567U (en) | 2023-03-21 | 2023-03-21 | Bionic fish fin type vortex generator and blade comprising same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320596528.4U CN219262567U (en) | 2023-03-21 | 2023-03-21 | Bionic fish fin type vortex generator and blade comprising same |
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| Publication Number | Publication Date |
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| CN219262567U true CN219262567U (en) | 2023-06-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320596528.4U Active CN219262567U (en) | 2023-03-21 | 2023-03-21 | Bionic fish fin type vortex generator and blade comprising same |
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| CN (1) | CN219262567U (en) |
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- 2023-03-21 CN CN202320596528.4U patent/CN219262567U/en active Active
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