CN201152230Y - Cross axis wind motor with blade tip winglet - Google Patents

Abstract

The utility model relates to wind power generating equipment, in particular to a horizontal axis wind machine with blade tip winglets. More specifically, it relates to a horizontal axis wind turbine with an automatic stall adjustment function, which can improve the aerodynamic characteristics of the wind turbine rotor, structural dynamic characteristics, dynamic load distribution on the blade surface, blade tip vortex shedding frequency, and reduce the radiation noise of the rotor. Tip-toothed winglet device. The utility model comprises a blade (2), a wheel hub (3), a nacelle (4), and a tower base (5). A small wing (1) is arranged at the blade tip of the blade on the wind wheel, and the blade tip small wing (1) is flat. The shape of the utility model is similar to that of a triangle, and the hypotenuse part (S) is in the shape of a comb; the utility model has the advantage of simply installing a flat-shaped winglet at the blade tip of the wind turbine without changing the structural parameters of the original wind turbine. Improve the overall performance of the wind turbine. Moreover, the blade tip winglet in the utility model adopts a flat plate structure, which has a simple structure, a short process flow, fewer procedures, low manufacturing cost and easy installation.

Description

Horizontal axis wind turbine with tip winglets

technical field

The utility model relates to wind power generating equipment, in particular to a horizontal axis wind machine with blade tip winglets. More specifically, it relates to a horizontal axis wind turbine with an automatic stall adjustment function, which can improve the aerodynamic characteristics of the wind turbine rotor, structural dynamic characteristics, dynamic load distribution on the blade surface, blade tip vortex shedding frequency, and reduce the radiation noise of the rotor. Blade tip winglet device.

Background technique

As a clean renewable energy, wind energy will play an important role in the future energy system. Over the past ten years, the world's wind power has developed rapidly with an annual growth rate of about 30%. In my country, the research on wind turbine technology has also made rapid progress. A series of large and medium-sized grid-connected wind turbines ranging from 100 kilowatts to megawatts have been developed, and some of them have been commercialized.

At present, patent documents similar to utility models have been published, such as JP2004084590, CN1308594C, CN2270125Y, US4362469, US4093402A, US4003676A. In these documents, most of the winglets adopt the same airfoil as the wind rotor blade, which changes the distribution of the wake flow field of the wind turbine and the circulation distribution of the blade tip, which reduces the induced resistance and improves the efficiency of the wind turbine. However, because the winglet in the literature is an airfoil, the structure is more complicated, the process is more, the production cost is high, and the installation is difficult.

Contents of the invention

The purpose of the utility model is to provide a horizontal-axis wind turbine with a blade-tip toothlet in view of the technical deficiencies such as complex structure, difficult processing, high manufacturing cost, and difficult installation of the existing wind rotor blade tip. The tooth-shaped winglet can improve the stall characteristics, aerodynamic characteristics, structural dynamic characteristics, blade surface dynamic load distribution and reduce the radiation noise of the wind turbine in the utility model, so that the wind turbine can save energy and improve efficiency.

The utility model goal is realized by the following technical solutions:

The utility model includes a blade 2, a hub 3, a nacelle 4, and a tower base 5. A small wing 1 is arranged at the blade tip of the blade on the wind wheel. shape; the hypotenuse part of the leaflet tip, which is similar to a triangle, is comb-shaped, and the longitudinal section of each comb tooth is triangular; the tooth tip angle φ=15°-90° of the comb tooth on the hypotenuse S of the winglet curve , the height H of the tooth is 0.1-0.3 times the length of the straight edge L of the leading edge, and the arc radius R of the tooth tip is 0.06-0.2 times the height H of the tooth; the mounting surface M of the blade tip winglet 1 and the blade tip The section of the airfoil is coincident, the installation point of the leading edge straight edge L is located at the leading edge point a of the blade tip airfoil, and the trailing edge straight edge h is installed near the trailing edge point b along the direction of the chord c; the length of the flange B of the installation surface is the blade tip The chord length of the airfoil is 0.7-0.9 times, the length of the straight edge L of the leading edge is 0.9-1.2 times the length of the folding edge B of the mounting surface, the length of the connecting side E is 0.1-0.25 times the length of the straight edge L of the leading edge, and the back tension angle β =35°-55°, the length of the straight side h of the trailing edge is 0.9-1.2 times the length of the connecting side E; the material of the tip-toothed winglet 1 is flat wood or glass fiber reinforced plastic or reinforced aluminum plate.

The utility model has the advantage of improving the comprehensive performance of the wind power machine by simply installing flat-shaped toothed winglets at the tip of the wind power machine without changing the structural parameters of the original wind power machine. Due to the action of the aerodynamic force and the special tooth profile, the tip-toothed winglets in the utility model enable the wind turbine of the utility model to have an automatic stall adjustment function on the basis of satisfying the above functions, and improve the structural dynamic characteristics of the wind turbine. , change the dynamic frequency curve trend of the wind rotor when it is working, so that it has a tendency to leave the speed resonance area, improve the dynamic load distribution on the blade surface and the blade tip shedding frequency, and reduce the radiation noise of the wind rotor. In addition, the tip-toothed winglet of the utility model adopts a flat plate structure, which has the advantages of simple structure, short technological process, few working procedures, low manufacturing cost and easy installation.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the horizontal axis wind turbine of the present invention

Fig. 2 is a structural schematic diagram of the utility model toothed winglet

Fig. 3 is a schematic diagram of the installation position of the blade-toothed winglet of the utility model

Fig. 4 is the schematic diagram of A-A sectional view of the installation of the blade tip toothed winglet of the utility model

Detailed ways

Below in conjunction with accompanying drawing and embodiment the technical scheme of the utility model is further described

The labels in accompanying drawings 1 to 4 represent respectively: 1-toothed winglet, 2-wind turbine blade, 3-hub, 4-nacelle, 5-tower, 6-blade suction surface, 7-blade pressure surface, I -Incoming flow direction, II-rotation direction of wind turbine, B-folding of installation surface, L-straight edge of front edge, h-straight edge of rear edge, E-connecting edge, H-tooth height, φ-tooth bevel Vertex angle, S-tooth hypotenuse, R-tooth tip arc radius, M-installation surface, I-incoming flow direction, B-installation surface folded edge, L-front edge straight edge h-rear edge straight edge, E-connecting edge, H-tooth height, φ-addendum angle, a-airfoil leading edge point, b-airfoil trailing edge point, c-blade tip airfoil chord line, β-back tension angle.

Overall structure of the utility model as shown in Figure 1, is mainly made up of blade 2, wheel hub 3, engine room 4, tower seat 5. Wherein the engine room 4 has a gear transmission, a generator, an adjustment device and its electrical steering mechanism, an electrical control device, a hydraulic pump, and the like.

The winglet 1 designed by the utility model is installed on the blade tip part of the blade 2, and the installation connection is as shown in Figure 3 . The structure of the winglet is shown in Figure 2, and the material can be made of flat wood or fiberglass or reinforced aluminum plate light material.

The utility model embodiment comprises blade 2, wheel hub 3, nacelle 4, tower seat 5, and the tip of the blade on the wind wheel is provided with winglet 1, and tip winglet (1) is flat plate and approximates triangle, hypotenuse The part S is in the shape of a comb; the hypotenuse part of the tip-toothed winglet, which is approximately triangular, is in the shape of a comb, and the longitudinal section of each comb tooth is triangular; = 45°, the height H of the tooth is 0.1 times of the length of the straight edge L of the leading edge, and the arc radius R of the tooth tip is 0.15 times of the height H of the tooth; The cross-section coincides, the installation point of the straight edge L of the leading edge is located at the leading edge point a of the tip airfoil, the straight edge h of the trailing edge is installed near the trailing edge point b along the direction of the chord c; the length of the flange B of the mounting surface is the tip of the wing The chord length c is 0.9 times, the length of the straight edge L of the front edge is 1 times the length of the flange B of the mounting surface, the length of the connecting edge E is 0.2 times that of the straight edge L of the front edge, the back tension angle β=45°, and the rear edge is straight The length of the side h is 1 time of the length of the connecting side E; the material of the tip-toothed winglet (1) is flat wood or glass fiber reinforced plastic or strengthened aluminum plate. The installation point is located at the leading edge point a of the blade tip airfoil, and the straight edge (h) of the trailing edge is installed near the trailing edge point b along the direction of the chord d.

Although the above has been described in detail according to the conception and implementation of the utility model and utility model purpose with reference to the accompanying drawings, those skilled in the art can recognize that the utility model can still be modified without departing from the scope of the claims. Various improvements and changes are made, and such improvements and changes still apply and belong to the protection scope of the present utility model.

Claims (5)

1, a kind of horizontal-shaft wind turbine that has tip vane, comprise blade (2), wheel hub (3), cabin (4), tower seat (5), the blade tip place of wind wheel upper blade is provided with winglet (1), it is characterized in that, tip vane (1) is plate and is similar to triangle, and hypotenuse part (S) is comb shape.

2, a kind of horizontal-shaft wind turbine that has tip vane according to claim 1 is characterized in that, the hypotenuse that is similar to leg-of-mutton tip vane partly is comb shape, and the longitudinal cross-section of its each broach is triangular in shape.

3, a kind of horizontal-shaft wind turbine that has tip vane according to claim 1 and 2, it is characterized in that, addendum angle φ=15 of the broach on the winglet curve hypotenuse (S) °-90 °, the height of tooth (H) be leading edge straight flange (L) length 0.1-0.3 doubly, tip circular-arc radius (R) be 0.06-0.2 times of height (H) of tooth.

4, a kind of horizontal-shaft wind turbine that has tip vane according to claim 1, it is characterized in that, the attachment face (M) of described tip vane (1) overlaps with blade tip aerofoil profile section, leading edge straight flange (L) mounting points is positioned at blade tip aerofoil profile leading edge point (a) to be located, and trailing edge straight flange (h) is installed near the trailing edge point (b) along wing chord (c) direction; Attachment face flanging (B) length is 0.7-0.9 times of blade tip aerofoil profile chord length (c), leading edge straight flange (L) length is 0.9-1.2 times of attachment face flanging (B) length, fillet (E) length is that leading edge straight flange (L) is 0.1-0.25 times, back subtended angle β=35 °-55 °, trailing edge straight flange (h) length is 0.9-1.2 times of fillet (E) length.

5, a kind of horizontal-shaft wind turbine that has tip vane according to claim 1 is characterized in that, the material of described blade tip flute profile winglet (1) is plate timber or glass fibre reinforced plastics or strengthens aluminium sheet.

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