CN112211796A

CN112211796A - Power-increasing noise-reducing blade structure

Info

Publication number: CN112211796A
Application number: CN202011227723.7A
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: 2021-01-12

Abstract

The invention discloses a power-enhancing and noise-reducing blade structure. The power-enhancing and noise-reducing structure is a toothed dovetail flap, and the power-enhancing and noise-reducing structure is installed on the trailing edge of the blade span. The height of the dovetail flap is 2%-5% of the local chord length of the blade, the height of the toothed structure is 80%-90% of the height of the dovetail flap, and the toothed structure can be a regular triangle, a sinusoidal waveform, Displaced sine wave, right triangle. The invention provides a power-increasing and noise-reducing blade structure, which can reduce the airflow noise of the fan blade, suppress the noise modulation, and improve the working ability of the blade.

Description

Power-increasing noise-reducing blade structure

Technical Field

The invention relates to the technical field of fan blade tip noise reduction and power increase design, in particular to a noise reduction and power increase structure of a wind driven generator blade.

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 present invention has been made in view of this situation.

Disclosure of Invention

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.

Further, the height of the dovetail flap is 2% -5% of the local chord length.

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. By the flow separation control technology, a large-size regular vortex structure is split into small-size irregular vortices, opposite symmetrical vortices are formed at the tooth-shaped flaps, low-frequency noise formed by interaction of airflow at the tail edges is weakened, and meanwhile the work-doing capability of the blades is improved.

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 a power increasing and noise reducing blade structure according to the present invention;

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

FIG. 3 is a partial schematic view of another embodiment of a tooth-like dovetail configuration in the power increasing and noise reducing blade configuration of the present invention, wherein the tooth-like configuration is a sinusoidal wave distribution;

FIG. 4 is a partial schematic view of another embodiment of a tooth-shaped dovetail structure in the power-increasing and noise-reducing blade structure according to the present invention, 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-like dovetail in the power increasing and noise reducing blade structure of the present invention, wherein the tooth-like structure is a right triangle;

reference numerals:

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

Detailed Description

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

Example 1

The invention designs a power increasing and noise reducing blade structure as shown in figures 1 and 2, wherein the power increasing and noise reducing blade structure is in the shape of a toothed flap, dovetail flaps are distributed on two sides of a pressure surface and a suction surface of the trailing edge of the blade, the height of one side is 2% -5% of the local chord length, and the flaps and the trailing edge of the blade are in round chamfer transition. 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 merely preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, so that variations based on the shape and principle of the present invention should be covered by the protection scope of the present invention.

Claims

1. The utility model provides a blade structure of making an uproar falls in increase power, includes blade body (1), its characterized in that is provided with tooth profile swallow-tail form flap (2) at the trailing edge department of blade body (1), tooth profile swallow-tail form flap perpendicular to local chord line.

2. A power and noise reduction blade construction according to claim 1, characterized in that the height of the dovetail flap (2) is 2-5% of the local chord length of the blade.

3. A power and noise reducing blade construction as claimed in claim 2, wherein the tooth profile construction has a height of 80% to 90% of the height of the dovetail flap.

4. A power increasing and noise reducing blade structure according to claim 3, wherein said tooth-like structure (3) is selected from the group consisting of regular triangle, sine wave, offset sine wave, and right triangle.

5. A power increasing and noise reducing blade structure as claimed in claims 1 to 4, wherein the tooth-shaped dovetail flap structure blade divides large-size vortices into small-size vortices, so that the trailing edge flowing vortex structure is regularly and uniformly distributed to form opposite symmetrical vortices, noise caused by interaction of airflow in the trailing edge section is weakened, and meanwhile, the dovetail flap structure improves the power capability of the blade.