CN203114497U - Bidirectional blade of horizontal axis tidal current energy generator - Google Patents

Abstract

The utility model discloses a bidirectional blade of a horizontal axis tidal current energy generator. The blade comprises an upper half part and a lower half part, wherein the working face of the upper half part faces a forward incoming flow; the working face of the lower half part faces a reverse incoming flow; BDA66-12 airfoil is adopted by the cross section of the upper half part; and BDA65-21 airfoil is adopted by the cross section of the lower half part. An incident flow control device is not required to be arranged for the tidal current generator using the bidirectional blade, both forward and reverse incoming flows can keep higher efficiency, meanwhile, the reliability of the device is improved, the accident rate of the device is greatly reduced, and the maintenance cost of the device is reduced; and a thicker airfoil is adopted for the blade part with high strength requirement, the airfoil with smaller thickness and better hydrodynamic performance is adopted for a main energy extraction region on the part with radius of 30-100 percent of the blade, and the hydrodynamic performance of a turbine is not reduced and the requirement of the blade on strength can also be guaranteed.

Description

Bidirectional blades of horizontal axis tidal current energy generator

technical field

The utility model belongs to the technical field of tidal current generators, in particular to bidirectional blades of horizontal axis tidal current energy generators.

Background technique

Tidal phenomena refer to the periodic movement of seawater under the gravitational force of celestial bodies (mainly the moon and the sun). It is customary to call the vertical fluctuation of the sea surface a tide, while the horizontal flow of seawater is called a tidal current. When the tidal phenomenon occurs, there is a huge amount of energy. This energy is called tidal energy. It is a regeneration that does not consume fuel, has no pollution, is not affected by floods or dry water, is inexhaustible, has strong periodicity and is relatively stable. energy, and it is specific and predictable in a specific sea area. Our country has huge tidal energy reserves. How to make better use of these renewable energy sources is very important to today's society where non-renewable energy sources are decreasing day by day.

Most of the existing tidal current generator blades used for tidal power generation use unidirectional blades. The operating range of the generator with such unidirectional blades is relatively fixed. When the incoming flow is reversed, the lift force of the blades decreases, and the resistance increases, so the generator will not work normally.

Contents of the invention

In order to overcome the above-mentioned defects existing in the prior art field, the purpose of this utility model is to provide a bidirectional blade of a horizontal axis tidal current energy generator, which solves the problem that the prior art adopts a unidirectional blade with better unidirectional hydrodynamic performance, and reverse hydraulic The power performance is poor, and it cannot meet the requirement of maintaining high power generation efficiency in both directions.

The bi-directional blades of the horizontal axis tidal current energy generator provided by the utility model, the blades include the upper half of the working surface facing the forward flow and the lower half of the working surface facing the reverse flow, the upper half The cross section adopts the BDA66-12 airfoil, and the lower half cross section adopts the BDA65-21 airfoil; in the cross section, the airfoil of the upper half and the airfoil of the lower half are centrally symmetrical; In the cross section, the chords of the airfoils of the upper half and the airfoils of the lower half are collinear. the

The bidirectional blades of the horizontal axis tidal current energy generator provided by the utility model have the beneficial effect that the bidirectional symmetrical airfoil modification design is carried out on the unidirectional airfoil to adapt to the characteristics of the reciprocating motion of the tidal current, and the tidal current generator using the bidirectional blades does not need Install the front flow control device, the positive and negative flow can maintain high efficiency, and at the same time improve the reliability of the device, greatly reduce the accident rate of the device, and reduce the maintenance cost of the device; for blade parts with high strength requirements A thicker airfoil is used, and a thinner airfoil with better hydrodynamic performance is used for the main energy extraction area at the blade radius of 30%-100%. The combination of the two airfoils will not reduce the hydrodynamic performance of the turbine, and can also Ensure its strength requirements.

Description of drawings

Fig. 1 is the overall structural representation of the utility model;

Fig. 2 is a top view of the utility model.

Labeled in the figure:

1. Blade; 2. Upper half; 3. Lower half.

Detailed ways

Referring to the accompanying drawings, the bi-directional blades of the horizontal-axis tidal current energy generator provided by the present invention will be described in detail in combination with an embodiment.

Example

Referring to Figures 1-2, the bidirectional blades of the horizontal axis tidal current energy generator of this embodiment, the blade 1 includes the upper half 2 whose working face faces the forward incoming flow and the lower half whose working face faces the reverse incoming flow 3. The cross section of the upper half 2 adopts the BDA66-12 airfoil, and the cross section of the lower half 3 adopts the BDA65-21 airfoil; in the cross section, the airfoil of the upper half 2 and The airfoil of the lower half 3 is centrally symmetrical; in cross section, the chords of the airfoil of the upper half 2 and the airfoil of the lower half 3 are collinear. Using the tidal current generator of the utility model can maintain higher performance when seawater flows in both directions, and improve power generation efficiency.

Claims (3)

1. the bidirectional blade that a horizontal axis trend can generator, it is characterized in that: described blade comprises that working surface is met to the first half of forward incoming flow and working surface and meets Lower Half to reverse incoming flow, the BDA66-12 aerofoil profile is adopted in described first half cross section, and the BDA65-21 aerofoil profile is adopted in described Lower Half cross section.

2. the bidirectional blade that horizontal axis trend according to claim 1 can generator, it is characterized in that: on cross section, the aerofoil profile of the described first half and the aerofoil profile of Lower Half are centrosymmetric.

3. the bidirectional blade that horizontal axis trend according to claim 1 can generator is characterized in that: on cross section, and the wing chord conllinear of the aerofoil profile of the described first half and the aerofoil profile of Lower Half.

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