CN213743835U

CN213743835U - Power-increasing noise-reducing blade structure

Info

Publication number: CN213743835U
Application number: CN202022512083.6U
Authority: CN
Inventors: 郑楠; 叶学民; 李春曦; 江蕊; 郭馨声
Original assignee: North China Electric Power University
Current assignee: North China Electric Power University
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2021-07-20
Anticipated expiration: 2030-10-30

Abstract

The utility model discloses a power increasing and noise reducing blade structure, power increasing and noise reducing structure for tooth form dovetail shape flap, power increasing and noise reducing structure install in the trailing edge of blade span, dovetail shape flap height be 2% -5% of blade local chord length, tooth form structure height be 80% -90% of dovetail shape flap height, tooth form structure can be regular triangle, sine wave form, dislocation sine wave nature, right triangle. The utility model provides a power-increasing and noise-reducing blade structure can reduce fan blade airflow noise, suppresses noise modulation, promotes blade acting capacity.

Description

Power-increasing noise-reducing blade structure

Technical Field

The utility model relates to a fan blade apex falls the technical field of the design of making an uproar and increasing power, specifically speaking, especially aerogenerator blade fall the structure of making an uproar and increasing power.

Background

With the increasing demand of renewable energy sources such as wind power generation and the like, the wind turbine occupies a larger and larger proportion in the energy source structure. The low-frequency noise generated by the straight traditional wind turbine without the flow separation control technology on the tail edge of the blade can have adverse effects on the balance of various hormones and the breeding of animal species in nearby animals, and can seriously kill certain animals.

The main noises of the wind generating set comprise mechanical noises and aerodynamic noises, wherein the aerodynamic noises are aerodynamic noises generated by the disturbance of blades and air. The noise of the wind turbine can be reduced by reducing the power of the wind turbine and installing a noise reduction device on the blade of the wind turbine. Reducing the power operation of the wind turbine greatly reduces the utilization rate of the wind energy of the wind driven generator, so an improved design for reducing noise and increasing power of the blade tip of the efficient blade is needed.

The invention is proposed in view of this.

SUMMERY OF THE UTILITY MODEL

In view of the foregoing analysis, the present application aims to provide a power increasing and noise reducing blade structure, which can overcome the defects of the prior art, fully utilize the flow separation control technology, optimize the wake vortex structure of the blade, weaken the noise formed by the interaction of the airflow at the trailing edge section, and improve the work capacity of the blade.

The purpose of the application is mainly realized by the following technical scheme:

the application provides a blade structure of making an uproar falls in increase merit, the blade structure of making an uproar falls in increase merit include the blade body, the trailing edge department of its characterized in that blade body is provided with profile of tooth dovetail form flap.

Furthermore, the tooth-shaped dovetail flap is perpendicular to the local chord, and the height of the dovetail flap is 2% -5% of the local chord.

Further, the tooth-shaped structure is 80% -90% of the height of the local dovetail flap.

Furthermore, the tooth-shaped structure can be a regular triangle, a sine waveform, a staggered sine waveform and a right triangle.

Further, the side length and the sine wave wavelength of the triangle of the tooth-shaped structure are related to the Reynolds number of the blade in the local running state.

Furthermore, the tooth-shaped dovetail flap structure blade divides a large-size vortex into small-size vortices, so that a trailing edge flowing vortex structure is regularly and uniformly distributed to form opposite symmetrical vortices, noise formed by interaction of airflow in a trailing edge section is weakened, and meanwhile, the dovetail flap structure improves the acting capacity of the blade.

Compared with the prior art, the application can realize the following beneficial effects:

(a) the purpose of reducing aerodynamic noise of the blade, particularly low-frequency noise is achieved by changing the airflow flowing state of the tail edge section of the blade;

(b) the working capacity of the blades is improved while the noise is reduced;

(c) simple structure, low manufacturing cost and strong practicability.

Drawings

FIG. 1 is a schematic view of the structure of the novel power-increasing noise-reducing blade;

FIG. 2 is a schematic view of an embodiment of a tooth-shaped dovetail in the novel power-increasing and noise-reducing blade structure, wherein the tooth-shaped structure is distributed in a regular triangle;

FIG. 3 is a partial schematic view of another embodiment of a tooth-shaped dovetail in the novel power increasing and noise reducing blade structure, wherein the tooth-shaped dovetail is distributed in a sine wave manner;

FIG. 4 is a partial schematic view of another embodiment of a tooth-shaped dovetail structure in the novel power-increasing and noise-reducing blade structure, wherein the tooth-shaped structure is a staggered sine wave distribution, and the phase difference between the upper and lower waveforms is π/2;

FIG. 5 is a schematic view of one embodiment of a tooth-shaped dovetail in the novel power increasing and noise reducing blade structure, wherein the tooth-shaped structure is a right triangle;

reference numerals:

1-a blade body; 2-dovetail flaps; 3-tooth-shaped structure.

Detailed Description

The following describes the present invention in further detail with reference to the accompanying drawings.

Example 1

This novel design as shown in figure 1, figure 2 a blade structure of making an uproar falls in increasing power, the blade structure of making an uproar falls in increasing power be the profile of tooth front of a garment wing, swallow tail form flap distribute in blade trailing edge pressure surface and suction surface both sides, the unilateral height is 2% -5% of local chord length, the flap adopts the round chamfer transition with the blade trailing edge. The height of the tooth-shaped structure is 80% -90% of the height of the local dovetail flap. The tooth-shaped structure can be a regular triangle.

Example 2

Unlike embodiment 1, the tooth profile structure described in this example has a symmetrical sinusoidal waveform (as shown in fig. 3).

Example 3

Unlike embodiment 2, the tooth structure according to the present example is a shifted sine wave (as shown in fig. 4).

Example 4

Unlike embodiment 1, the tooth structure according to the present example is a right triangle (as shown in fig. 5).

The above-mentioned embodiments are only preferred embodiments of the present invention, and not intended to limit the scope of the present invention, so that all changes in the shape and principle of the present invention should be covered by the protection scope of the present invention.

Claims

1. A power-increasing and noise-reducing blade structure, comprising a blade body (1), characterized in that a toothed dovetail flap (2) is provided at the trailing edge of the blade body (1), and the toothed dovetail-shaped flap (2) is provided. The flaps are perpendicular to the local chord.

2 . The power enhancement and noise reduction blade structure according to claim 1 , wherein the height of the dovetail flap ( 2 ) is 2%-5% of the local chord length of the blade. 3 .

3 . The power enhancement and noise reduction blade structure according to claim 1 , wherein the toothed structure height of the toothed dovetail flap is 80%-90% of the height of the dovetail flap. 4 .

4 . The power-increasing and noise-reducing blade structure according to claim 3 , wherein the toothed structure ( 3 ) can be a regular triangle, a sine wave, a staggered sine wave, or a right-angled triangle. 5 .

5. A power-increasing and noise-reducing blade structure according to claim 1 or 4, wherein the toothed dovetail-shaped flap structure blade splits large-scale vortices into small-scale vortices, so that trailing edge flow vortices The structure presents a regular and uniform distribution, forming opposite symmetrical vortices, which weakens the noise caused by the interaction of the airflow in the trailing edge section, and at the same time, the dovetail-shaped flap structure improves the working ability of the blade.