CN217898082U

CN217898082U - Wingtip winglet for fan blade and fan blade

Info

Publication number: CN217898082U
Application number: CN202221487175.6U
Authority: CN
Inventors: 张翼飞; 毛中宇
Original assignee: Guodian United Power Technology Co Ltd
Current assignee: Guodian United Power Technology Co Ltd
Priority date: 2022-06-15
Filing date: 2022-06-15
Publication date: 2022-11-25
Anticipated expiration: 2032-06-15

Abstract

The utility model provides a winglet and fan blade for fan blade relates to winglet's field. The front end of the wingtip winglet is fixedly connected with the tip end face of the wing and is close to the front edge of the wingtip, the wingtip winglet bends and extends backwards along the rotation direction of the wingtip vortex, and the rear end of the wingtip winglet is fixedly connected with the pressure surface at the wingtip and is close to the tail edge of the wingtip. According to the wingtip winglet, the part of the wingtip winglet extending out from the front end forms guide to airflow of the suction surface, and the part of the wingtip winglet extending out from the rear end forms blocking and guide to airflow of the pressure surface, so that the airflow of the suction surface and the airflow of the pressure surface can be well separated, and wingtip vortex is weakened. This wingtip winglet, front end and rear end all with fan blade's wingtip fixed connection, its front end can receive the support of wingtip terminal surface, and the rear end can receive the support of wingtip department pressure surface, not only with fan blade firm in connection, the structural strength of self obtains the reinforcing moreover to life is than longer. In addition, the wingtip winglet can also increase the blade growth and improve the blade lift force.

Description

Wingtip winglet for fan blade and fan blade

Technical Field

The utility model relates to a technical field of winglet slightly, particularly, relate to a winglet and fan blade for fan blade's wing tip.

Background

The fan blade is divided into a Pressure Surface (PS Surface) and a Suction Surface (SS Surface). The pressure surface is a windward surface, and the fluid pressure is higher; the suction surface is leeward, and the fluid pressure is lower. At the tip, since there is no longer a vane blockage, the airflow will flow from the pressure side to the suction side, around the tip, forming a strong tip vortex, and extending from the tip all the way downstream. The wing tip vortex can increase the pressure of the suction surface and reduce the pressure of the pressure surface, thereby reducing the lift force on the blade and increasing the induced resistance.

Wingtip winglets (winglets), an aerodynamic component mounted on the wing tip, similar to the small wings of the airfoil, were invented by the National Aeronautics and Space Administration (NASA) asmus research center r.t. wheatcom (r.t. whitcomb) in the last 80 centuries for the purpose of attenuating the induced drag on the wing.

In the prior art, in order to weaken induced resistance on the fan blades, wingtip winglets are also arranged on some fan blades, however, the arranged wingtip winglets are L-shaped slightly smaller winglets, and although the wingtip winglets are simple in appearance, the structural strength is low, and the service life is short.

SUMMERY OF THE UTILITY MODEL

A first object of the utility model is to provide a winglet for fan blade to solve the L type winglet structural strength ratio on the fan blade that exists among the prior art lower, life is than short technical problem.

The utility model provides a wingtip winglet for fan blade, its front end just is close to wingtip leading edge with wing tip terminal surface fixed connection, and the direction of rotation backward bending that follows wing tip vortex extends, and rear end and wingtip department pressure surface fixed connection just are close to wingtip trailing edge.

The utility model provides a wingtip winglet for fan blade, the part that its front end was extended away forms the guide to the air current of suction surface, and the part that the rear end was extended away forms the air current of pressure surface and blocks and guide to can make the air current of suction surface and the air current of pressure surface realize good separation, and then weaken wing point vortex. The utility model provides a wingtip winglet for fan blade, front end and rear end all with fan blade's wingtip fixed connection, its front end can receive the support of wingtip terminal surface, and the rear end can receive the support of wingtip department pressure surface, so not only with fan blade firm in connection, the structural strength of self obtains the reinforcing moreover to life is than longer. In addition, this winglet can also increase fan blade's span-wise length to can promote the lift on the fan blade.

Further, the rear end of the winglet is arranged perpendicular to the pressure surface at the wing tip.

Under this technical scheme, the winglet is positive relative with the air current that flows to the wing tip, and is good to blockking of air current to the weakening effect to the wing tip vortex is strong.

Further, the winglet comprises a front winglet and a rear winglet, wherein the front winglet is the part of the winglet extending from the front end to the pressure surface, the rear winglet is the part of the winglet extending from the rear end to the pressure surface, and the front winglet is fixedly connected with the rear winglet.

Under the technical scheme, the front winglet and the rear winglet are separately analyzed from a pneumatic angle, and both the front winglet and the rear winglet are similar to the conventional L-shaped wing tip winglet and can play a role in blocking airflow from flowing to a suction surface, so that wing tip vortexes can be weakened, and the induced resistance is reduced; and after the front winglet and the rear winglet are connected together, a tandem wing structure is formed, and wing tip vortexes can be weakened or even eliminated at the connection part, so that the induced resistance is further reduced.

Further, the leading winglet is integrally formed with the trailing winglet.

Under the technical scheme, the front winglet and the rear winglet are of an integrated structure, so that the production process of assembling the front winglet and the rear winglet can be omitted, and the production efficiency is improved; the air flow interference of the assembly parts can be avoided without the assembly parts; in addition, the connection between the two is firmer.

Further, the leading edge of the leading winglet coincides with the leading edge of the wing tip, and/or the trailing edge of the trailing winglet coincides with the trailing edge of the wing tip.

Under the technical scheme, although the wingtip winglet is arranged, the structures of the front edge and the tail edge at the wingtip are still smooth, and the interference on the airflow of the front edge and the tail edge of the wingtip is small.

Further, the chord length of the leading winglet and the chord length of the trailing winglet together are equal to the chord length of the wing tip.

Under the technical scheme, the small or even no gap exists between the front winglet and the rear winglet, so that the good separation of airflow on the pressure surface and the suction surface is facilitated, and compared with the condition that the sum of the chord lengths of the front winglet and the rear winglet is larger than the chord length of the wing tip, namely the overlapping part of the front winglet and the rear winglet is more, the wingtip winglet has the advantages of less material consumption, light weight and small influence on the whole fan blade.

Further, the shape of the tip winglet comprises a plurality of wing profiles, and the two adjacent wing profiles are in smooth transition.

Under this technical scheme, compare in single wing section, adopt multiple wing section can more adapt to the air current that flows to improve the guide effect to the air current, so that realize the good separation of air current.

Further, the winglet shape comprises five wing profiles, the root profile alpha of the front winglet is NACA2412 thickening 160%, the transition profile gamma between the front winglet and the rear winglet is NACA0012, the root profile epsilon of the rear winglet is NACA2412 thickening 260%, the transition profile beta of the front winglet is a profile interpolated from alpha and gamma, and the transition profile delta of the rear winglet is a profile interpolated from gamma and epsilon.

Further, the surface of the winglet is a NURBS (Non-Uniform Rational B-Splines) surface.

Under this technical scheme, the surface of winglet is more smooth to self viscidity and resistance are less.

A second object of the utility model is to provide a fan blade to solve the L type wingtip winglet structural strength ratio lower on the fan blade that exists among the prior art, technical problem that life ratio is short.

The utility model provides a fan blade, including the main wing, the wingtip of main wing is provided with foretell wingtip winglet that is used for fan blade.

The utility model provides a fan blade is provided with wingtip winglet, and the part that wingtip winglet front end extended away forms the guide to the air current of suction surface, and the part that the rear end extended away forms and stops and guide to the air current of pressure surface to can make the air current of suction surface and the air current of pressure surface realize good separation, and then weaken wing tip vortex. Furthermore, the utility model provides a fan blade, the front end and the rear end of wingtip winglet all with wingtip fixed connection, its front end can receive the support of wingtip terminal surface, and the rear end can receive the support of wingtip department pressure surface, so firm in connection between wingtip winglet and the main wing, the structural strength of self also obtains the reinforcing to life is than longer. In addition, the wingtip winglet is arranged to increase the spanwise length of the fan blade, so that the lift force of the fan blade is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic partial structural view of a fan blade according to an embodiment of the present invention;

fig. 2 is a perspective schematic view of a partial structure of a fan blade provided by an embodiment of the present invention.

Description of reference numerals:

110-front winglet; 120-rear winglet; 200-main wing;

PS-pressure side; f-leading edge; b-the trailing edge;

a-root airfoil of the front winglet;

a transition airfoil profile of a beta-leading winglet;

a transition airfoil between the gamma-leading winglet and the trailing winglet;

delta-transition airfoil profile of the aft winglet;

epsilon-root airfoil of the trailing winglet.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The present embodiment provides a winglet for a wind turbine blade, as shown in fig. 1 and 2, the front end of the winglet is fixedly connected to the tip end surface of the wing and is close to the front edge f of the tip, and is bent and extended backward in the rotation direction of the tip vortex, and the rear end of the winglet is fixedly connected to the pressure surface PS at the tip and is close to the tail edge b of the tip.

According to the wingtip winglet for the fan blade, the part of the wingtip winglet extending out from the front end forms guide for airflow of the suction surface, and the part of the wingtip winglet extending out from the rear end forms blocking and guide for airflow of the pressure surface PS, so that good separation of the airflow of the suction surface and the airflow of the pressure surface PS can be realized, and wing tip vortex is weakened. The wingtip winglet for fan blade that this embodiment provided, front end and rear end all with fan blade's wingtip fixed connection, its front end can receive the support of wingtip terminal surface, and the rear end can receive the support of wingtip department pressure surface PS, so not only with fan blade firm in connection, the structural strength of self obtains the reinforcing moreover to life is than longer. In addition, this winglet can also increase fan blade's span-wise length to can promote the lift on the fan blade.

In particular, in this embodiment, as shown in figures 1 and 2, the aft end of the winglet is arranged perpendicular to the pressure surface PS at the wing tip. Under the arrangement mode, the wingtip winglet is opposite to the front of the airflow flowing to the wingtip, the airflow blocking effect is good, and the weakening effect on the wingtip vortex is strong.

Specifically, in this embodiment, the winglet comprises a front winglet 110 and a rear winglet 120, the front winglet 110 being the part of the winglet extending from the front end to the pressure surface PS, the rear winglet 120 being the part of the winglet extending from the rear end to the pressure surface PS, and the front winglet 110 being fixedly connected to the rear winglet 120. Under the arrangement form, the front winglet 110 and the rear winglet 120 are separately analyzed from the aerodynamic angle, and both the winglets are similar to the conventional L-shaped wing tip winglet and can play a role of blocking airflow from flowing to a suction surface, so that wing tip vortexes can be weakened, and the induced resistance is reduced; and the front winglet 110 and the rear winglet 120 are connected together to form a tandem wing structure, and wing tip vortexes can be weakened or even eliminated at the connection part, so that the induced resistance is further reduced.

Specifically, in the present embodiment, the leading winglet 110 is integrally formed with the trailing winglet 120. In such an arrangement, the front winglet 110 and the rear winglet 120 are integrated, so that the production process of assembling the front winglet 110 and the rear winglet 120 can be omitted, and the production efficiency can be improved; the air flow interference of the assembly parts can be avoided without the assembly parts; in addition, the connection between the two is firmer.

Specifically, in this embodiment, the leading edge of the leading winglet 110 coincides with the leading edge f of the wing tip, and the trailing edge of the trailing winglet 120 coincides with the trailing edge b of the wing tip. In this arrangement, although the winglet is provided, the leading and trailing edges of the wing tip are still smooth in structure, and there is little interference with the airflow at the leading and trailing edges of the wing tip.

It should be noted that, in other embodiments of the present application, only the leading edge of the front winglet 110 may coincide with the leading edge f of the wing tip, or only the trailing edge of the rear winglet 120 may coincide with the trailing edge b of the wing tip, or even the leading edge of the front winglet 110 may not coincide with the leading edge f of the wing tip and the trailing edge of the rear winglet 120 may not coincide with the trailing edge b of the wing tip, that is, the present application may not specifically limit the positional relationship between the leading edge and the trailing edge of the wing tip and the leading edge and the trailing edge of the wing tip, as long as it is advantageous to attenuate the wing tip vortex and reduce the induced drag.

Specifically, in this embodiment, the chord length of the leading winglet 110 plus the chord length of the trailing winglet 120 is equal to the chord length of the wing tip. Under the arrangement form, the gap between the front winglet 110 and the rear winglet 120 is small or even no gap is formed, good separation of airflow of the pressure surface PS and airflow of the suction surface is facilitated, and compared with the condition that the sum of the chord lengths of the front winglet 110 and the rear winglet 120 is larger than the chord length of the wing tip, namely the overlapping part of the front winglet 110 and the rear winglet 120 is more, the technical scheme has the advantages of less material consumption, light weight and small influence on the whole fan blade.

Specifically, in the present embodiment, as shown in fig. 2, the tip winglet has a shape including a plurality of airfoils, and two adjacent airfoils are rounded. Under the form of the arrangement, compared with a single wing profile, the wing profiles can be more suitable for flowing air flow, so that the guiding effect on the air flow is improved, and the good separation of the air flow is realized.

Specifically, in this embodiment, and as further shown in fig. 2, the winglet shape includes five profiles, the root profile α of the leading winglet 110 is NACA2412, which is 160% thicker, the transition profile γ between the leading winglet 110 and the trailing winglet 120 is NACA0012, the root profile ∈ of the trailing winglet 120 is NACA2412, which is 260% thicker, the transition profile β of the leading winglet 110 is an interpolated profile of α and γ, and the transition profile δ of the trailing winglet 120 is an interpolated profile of γ and ∈.

It should be noted that in other embodiments of the present application, the shape of the winglet is not limited to include five airfoils, for example: the shape of the wingtip winglet can also comprise seven wing profiles, so that the wingtip winglet has a more delicate shape and is beneficial to improving the guiding effect on airflow; further, even if the winglet shape includes five wing profiles, the winglet shape is not limited to the five wing profiles, and the designer can design the winglet shape according to the specific structure of the fan blade and the specific shape of the tip vortex.

Specifically, in this embodiment, the surface of the winglet is NURBS curved. Under the arrangement mode, the surface of the wingtip winglet is smooth, so that the viscosity and the resistance of the wingtip winglet are low.

The present embodiment also provides a fan blade comprising a main wing 200, the tip of the main wing 200 being provided with a tip winglet for a fan blade as described above.

The fan blade provided by the embodiment is provided with the wingtip winglet, the part of the wingtip winglet extending out from the front end forms guide to the airflow of the suction surface, and the part of the wingtip winglet extending out from the rear end forms blocking and guide to the airflow of the pressure surface PS, so that the airflow of the suction surface and the airflow of the pressure surface PS can be well separated, and the wing tip vortex can be weakened. Moreover, according to the fan blade provided by the embodiment, the front end and the rear end of the winglet are both fixedly connected with the wing tip, the front end of the winglet can be supported by the wing tip end surface, and the rear end of the winglet can be supported by the pressure surface PS at the wing tip, so that the connection between the winglet and the main wing 200 is firm, the structural strength of the winglet is enhanced, and the service life of the winglet is long. In addition, the arrangement of the winglet also increases the spanwise length of the fan blade, so that the lift on the fan blade is also increased.

Finally, it is further noted that, herein, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, 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, method, article, or apparatus.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to the embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A wingtip winglet for a fan blade is characterized in that the front end of the wingtip winglet is fixedly connected with the tip end face of a wing, is close to the front edge of the wingtip and extends in a backward bending mode along the rotation direction of a wing tip vortex, and the rear end of the wingtip winglet is fixedly connected with a pressure surface at the wingtip and is close to the tail edge of the wingtip.

2. The tip winglet for a wind turbine blade according to claim 1, wherein the aft end of the tip winglet is arranged perpendicular to a pressure surface at the tip.

3. The winglet for a wind turbine blade according to claim 2, wherein the winglet comprises a front winglet (110) and a rear winglet (120), the front winglet (110) being part of an extension of the winglet from a front end to a pressure surface, the rear winglet (120) being part of an extension of the winglet from a rear end to a pressure surface, the front winglet (110) being fixedly connected to the rear winglet (120).

4. The winglet for a wind turbine blade according to claim 3, wherein the leading winglet (110) is integrally formed with the trailing winglet (120).

5. The winglet for a wind turbine blade according to claim 3 or 4, wherein the leading edge of the leading winglet (110) coincides with the leading edge of the tip and/or wherein the trailing edge of the trailing winglet (120) coincides with the trailing edge of the tip.

6. The winglet for a wind turbine blade according to claim 5, wherein the sum of the chord length of the leading winglet (110) and the chord length of the trailing winglet (120) is equal to the chord length of the tip.

7. The winglet for a wind turbine blade according to claim 3, wherein the winglet shape comprises a plurality of profiles with smooth transitions between adjacent profiles.

8. The winglet for a wind turbine blade according to claim 7, wherein the winglet shape comprises five profiles, the root profile α of the leading winglet (110) being NACA2412 with a 160% thickening, the transition profile γ between the leading winglet (110) and the trailing winglet (120) being NACA0012, the root profile ε of the trailing winglet (120) being NACA2412 with a 260% thickening, the transition profile β of the leading winglet (110) being an interpolated profile of α and γ, and the transition profile δ of the trailing winglet (120) being an interpolated profile of γ and ε.

9. The winglet for a wind turbine blade according to claim 7 or 8, wherein the surface of the winglet is NURBS curved.

10. A wind turbine blade, characterised by comprising a main wing (200), the tip of the main wing (200) being provided with a tip winglet for a wind turbine blade according to any of claims 1-9.