MXPA00001130A - Quiet rotor blade and wind energy installation equipped with rotor blades of this type - Google Patents

Abstract

The invention relates to a rotor blade and a wind energy installation with a rotor blade. The inventive rotor blade is provided with a rotor blade back edge, the rotor blade tapering to this back edge. The invention is characterised in that the degree to which the rotor blade tapers in the area of the rotor blade back edge increases in the direction of the rotorblade back edge and in that there is no step in the rotor blade at least in this area.

Description

ALBUTE OF LOW NOISE R AND INSTALLATION OF WIND ENERGY WITH SUCH R ALPS DESCRIPTION OF THE INVENTION: The invention relates to a r blade and a wind power installation having a r blade, and wherein the r blade is provided with a broken wing having a rear drag edge and the rear edge of the r blade narrowed towards the rear edge. The r blades for the installations are known in many ways. Unfortunately many r blades of the state of the art have the problem that to an extent not tolerable when operating the wind installation and with wind speeds of approximately 5 to 6 m / sec, annoying noise emissions are generated. The resulting noise emissions lead, among other things, to the population layers resisting the establishment of wind power stations by the production of noise. This leads to partial wind energy installations that can not be accepted or accepted with difficulty, since the authorities responsible for granting the permit to establish the wind farm refuse such permits for environmental considerations including noise that also counts as a pollution of the environment Therefore, for reasons of noise particularly in the proximity of residential buildings, it is desirable to reduce the levels previously REF .: 32166 mentioned noise emission in order to satisfy the established regulations and increase the acceptance of wind power installations. Therefore, the object of the present invention is to reduce the level of sound emission in wind energy installations. According to the present invention with a r blade according to the present invention, reaching and object because in the region of the edge or back edge of the r blade the degree of narrowing increases in the direction towards the rear edge of the blade and there there is no step-shaped step in the blade at least in the r blade region. A particularly advantageous embodiment of the invention is characterized in that the degree of narrowing of the r blade taper increases in space determined in a direction towards the rear edge of the r blade. In this aspect it is particularly preferred that double cross section of the back edge portion of the r blade, that is a portion adjacent to the rear cantle of the r blade are formed in the respective spacing, and between the bends the portion of The alab of the r is substantially flat. Then in the form d of the invention, the planes that are disposed between the bends form very flat angles to each other, so that the assembled assembly gives approximately the shape of a surface convexly curved with respect to the transverse section, of the portion of rear edge of the r blade. In another advantageous embodiment of the r blade according to the invention there are three turns essentially each parallel to the rear edge of the blade of the r. This embodiment represents an optimal compromise between the production expense of the turns in the r of the r. and a desired reduction clearly in the noise level of the moving r blade. It is especially preferred that, in the planes limited to one another by the turns, which form narrowing of the r blade in the direction of the rear corners of the r blade, they are only formed on the side of the r blade. Thus, it is advantageous for the recod only to be on the suction side in a ting vane having a pressure side and a suction side. In this way an especially clear reduction of the sound emissions is adjusted. Here it has been presented as advantageous that the acute angles that are formed in the planes that are in the bends, become more acute. The reduction of the angle size is made from the rear edge of the rotor blade in the direction towards the front edge of the rotor blade. The partial planes of the suction side that are closest to the rear edge of the rotor blade then form with the plane region the rear edge of the rotor blade in a nearly shear shape. The wind power installations provided with the rotor blade according to the invention mainly have a marked reduction in the generated noise level. By virtue of the reduced sound emission of the individual rotor alab. Therefore, the wind energy installations according to the invention represent a remarkable reduction of ecological discomfort for the population, therefore, the wind energy installation according to the invention considerably reduces the disadvantages indicated above of the wind energy installations usual in the current state of the art. The level of acceptance of the facilities by the population increases and the anti-noise regulations are more easily met. Other advantageous embodiments of the invention are set forth in the claims. The invention is described in greater detail hereinafter by means of a mode illustrated in the accompanying drawings. FIG. 1 shows a cross section through the rear edge of the rotor blade, in a rear section opposite to that of an embodiment of a rotor blade according to the present invention.; Figure 2 shows a section of Figures 1. Figure 1 shows an embodiment of a rotor blade according to the invention 1, in the figure only the rear part of the rotor blade, which is adjacent to a ridge, is presented. 2 rear rotor blade. the rear edge of the rotor 2 are the two sides of the blade of the rotor, one on the suction side 4 shown on the upper side of the figure and one side of the pressure 6 on the bottom side of the figure. The encounter one on the other of amb sides of the pressure blade 1 takes place at an angle agu. The angle o; it is formed of a plane 8, which contains essentially flat pressure side 6 of the rotor blade 1 and inclined plane a. The plane a contains a cut directly adjacent to the rear edge of the rotor blade 2, it belongs to the suction side 4 of the rotor blade 1. The essentially planar cor 4a thus determines in section A the degree of narrowing of the blade of rotor towards the rear edge of the rotor blade 2. In the section or cor 4a, a section 4b of the suction side 4 is connected without climbing, this is without the formation of a step in the form of a ladder. Section B is part of a plane b which forms an angle ß with the plane. The angle β is smaller than the angle α, so that the cut 4b of the suction side 4 encloses with the pressure side 6 a more acute angle than is the case between the section 4a and the plane 8. In the area B of Figure 1 s therefore determines the degree of narrowing of the rotor blade 1 by the slope of section 4b. The degree of narrowing of zone B of section 4b is less than region A of section 4a. Within the corresponding zones B or A, the degree of narrowing is almost constant, since section 4b and 4a of the suction side 4 are essentially planar. Again, in the direction already explained - without step in the direction of the leading edge of the rotor blade (shown) in section 4b is connected section 4c d suction side 4 also constructed as an inclined plane. Section 4c is part of a plane c, which forms with plane 8 an angle r. This gamma angle is again smaller than angle ß. The area C of the rotor blade 1, whose measurement determined by the length of the cut 4c of the suction side also has a nearly constant degree of narrowing of the rotor blade 1. Since the cut 4c and the opposite side in this pressure zone 6 also in the essential s planes. Seen from the rear edge of the rotor blade behind the section 4c a section 4d is connected again steps s. For section 4d, the same applies to sections 4a to 4c. Depending on the requirements of the rotating blade 1, the previously described row of inclined planes inside the suction side 4 can be continued at will, which enclose increasingly acute angles with the pressure side 6,. In this dependency it must be underlined that in the drawing real relationships are exaggerated for clarity. In Figure 2 for clarity, a cut 10 of Figures 1 has been increased. From Figure 2 it is made especially clear that between the inclination 4a and the inclination 4b there is no ladder-shaped staggering, but sections 4a and 4b approach at a bend 12 on the suction side 4. It is also made clear that the angle at which it lies between the section 4a and the pressure side 6 is greater than the angle β which lies between the section 4b on the suction side 4 and the pressure side 6. It is noted that in relation to this date, the best method known by the applicant to carry out the practice of the aforementioned invention, is the conventional one for the manufacture of the products to which the same it means .

Having described the invention as above, property is claimed as contained in the following:

Claims (10)

1. - Rotor blade for aeolian energy devices where the rotor blade narrows towards the rear edge of the rotor, characterized in that in the region of the rear cant of the rotor blade the degree of narrowing of the rotor blade increases in the direction of the rear edge of the rotor blade, the degree of narrowing in the distance (a, b, c) increases and between the bend the increase remains constant.

2. Rotor blade according to claim 1, characterized in that the degree of narrowing in distances increases and the increase between other positions remains constant.

3. - rotor blade according to one of the preceding claims, characterized in that the degree of narrowing d grows in the form of at least one bend in the blade of the rotor.

4. Rotor blade according to claim 3, characterized in that the bend or the turns essentially run parallel to the rear edge of the rotor blade.

5. Rotor blade according to claim 4, characterized in that three bends are provided.

6. Rotor blade according to one of claims 3 to 5, characterized in that the bend or bends are only provided on one side of the rotor blade.

7. Rotor blade according to one of claims 3 to 6, characterized in that the bend or l turns are only provided on the suction side.

8. - Rotor blade according to one of the preceding claims, with a section of the rotor blade rear edge, therein, which is adjacent to the rear rotor blade, characterized in that, on one side, the rotor section The rear edge of the rotor blade is in the flat essential.

9. - Rotor blade according to the previous claim, characterized in that the sides in the plane views seen from the cut or section of the rear edge of the rotor wing enclose with the other sides seen from the rear cant of the rotor blade, in the direction of the edge in front of the rotor blade angles that increase in its sharpness (or;, r). 10.- Installation of wind power with a rotor, which has one or more rotor blades according to the previous claims.