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INVENTION
Russian Federation Patent RU2261363

Wind turbine with a diffuser having two injection (windmill)

Wind turbine with a diffuser having two injection (windmill)

Name of the inventor: Richard A. Janson (RU); Gasilov Alexey
The name of the patentee: Jansson, Richard A. (RU); Gasilov Alexey
Address for correspondence: 121309, Moscow, ul. B. Filyovskaya, 17, kv.148, RA Janson
Starting date of the patent: 2003.11.17

The invention relates to the field of wind energy. The technical result is an increase in energy efficiency of the wind, reducing the axial length of the diffuser and its cost. Wind turbine wind turbine comprises a multiplier, generator, nacelle, the support apparatus with rotation mechanism and atmospheric diffuser in the form of an annular wing. On its inner wall, there are two successive independent gap to an annular injection, wherein the first blowing is carried out peripheral portion of the main air flow entering the wind wheel by acting on the peripheral portion of the stream terminated compressor portions blades separated plates from the main turbine part vanes and rotating diffuser recess in the housing, followed by supply of air in an annular channel located at the inner surface of the diffuser is divided into individual curved vanes interblade channels of the first slit and terminating injection.

DESCRIPTION OF THE INVENTION

The invention relates to the field of energy, namely wind turbines.

Known schematic horizontal-axis wind turbine with a diffuser having two seats injection in the form of annular slits outdoor air into the boundary layer is available in the inner surface of the diffuser, one blowing - in an annular gap at the entrance of the diffuser, directly into the propeller plane, the second - the annular slit on the inner surface of the diffuser, downstream (see. (1) str.134-138, Figure 4.11). Under this scheme, it was made in 1996 in New Zealand and has been installed and put into operation wind turbine Vortec-7 with an electric power of 1000 kW (see. (2)).

Famous manufacturer and operating wind turbine Caphom 10 CH / POL 10 kW (France) with a diffuser without blowing the annular wing type (see. (3)).

A disadvantage circuit having a boundary layer blowing outdoor air is relatively low power consumption of the injected air mass since introduced into the boundary layer of fluid momentum is determined relatively low kinetic energy of the external air flow and a small difference between the static pressures on the outer sides and the outer diffuser.

The technical result is to increase the energy efficiency of the wind, reducing the weight and cost of the diffuser. The solution of the task of achieving the claimed technical effect in the following way.

Wind turbine with a diffuser includes a wind turbine, the multiplier, generator, nacelle, the support apparatus with rotation mechanism and atmospheric diffuser in the form of an annular wing. On its inner wall, there are two successive independent gap to an annular injection into the boundary layer of the external air, and wherein the first blowing is carried out peripheral portion of the main air flow entering the wind wheel by means of exposure to the peripheral portion of the stream terminated compressor portions blades separated plates from the main part of the turbine blades and rotating in the recess of the diffuser housing, with subsequent delivery of air to the annular channel located beneath the inner surface of the diffuser is divided into individual curved vanes interblade channels of the first slit and terminating injection.

The body of the diffuser in its cross-section is performed in the form of an airfoil and forms a body of revolution, and the inner wall of the cone formed by the convex side of an airfoil and the diffuser is increasing along the length of the opening angle (Called as an annular diffuser wing). The maximum value of the opening angle limited to a separation of the boundary layer from the surface of the wall of the diffuser due to the increase of the positive pressure gradient in the direction of flow. To prevent such separation in the prototype and the analogues are provided as the inflow of external air through the first annular gap into the zone of formation of the boundary layer and the outer air inflow into the second annular gap in the area in front of the boundary layer separation. However, the relatively low momentum of the injected air flow does not allow to significantly reduce the length of the diffuser. To increase the amount of movement of air masses in the boundary layer (in order to ward off or avoid flow separation) is proposed to change and intensify the scheme of the first injection, namely, to form the first blown into the annular jet at the expense of not only the energy of the incoming flow to the air gap but also by selection a small fraction of the power of the wind turbine. For this purpose it is proposed to perform a peripheral portion of each blade propeller of a wind turbine in a compressor station. These peripheral portions of the blades are recessed into the annular gap to the inner wall of the diffuser. Nisha has no ledge in front of its parts and therefore the air freely sucked compressor section blades and forced them then into the annular slit channel located inside the diffuser body under its inner surface and starting directly behind the rotating blades, so that the entrance to the channel is the back of the niche . As a result of the boundary layer on the inner wall of the cone served as the kinetic energy of the atmospheric air and some small part of the power turbine, thereby preventing flow separation from the walls and reducing the loss in the diffuser, making the process of increasing the static pressure in the more efficient. This increases the negative pressure of the wind turbine, its output and, ultimately, utilization of wind energy, but also reduces the axial size of the diffuser and its mass.

Wind turbine with a diffuser having two injection (windmill)

1 is a schematic structural diagram of wind turbine with a diffuser having two air injection into the boundary layer on the inner wall. 2 shows a cross section of the diffuser body diagram showing the air ducts of the first and second injection. 3 is a scanning section A-A of Figure 1 showing the relative positioning of the blades and channels mezhlopastnyh annular portion of the first injection. 4 is given by section B-B of Figure 1, showing a view of the blade and the entrance to the first injection channel.

Wind turbine consists of the following main components: a wind turbine 1, ambient diffuser 5, the nacelle 11, a multiplier 12, an electric generator 13, prop 17. 1 has a wind turbine rotary blades (rotation mechanism in Figure 1 are not shown), the peripheral part 3 which has a profile, rotated at a certain angle relative to the longitudinal axis of the main part of the blade anticlockwise (Figure 3). Between the peripheral (compressor) portion 3 and the main blade (turbine), the blade part 2 has a separating plate 20. The diffuser of a housing 5, whose cross section (2) is obtained by rotating around its axis airfoil. On the inner surface of the diffuser at a certain distance from the inlet 4 is located a niche (2) of triangular cross-section, which rotate in the peripheral areas of the compressor blades. Niche 4 in its front part at A has a fracture surface of the wall and not the ledge. The rear of the Sun niche is the entrance to the annular channel 6 for the first slot blowing air injected peripheral (compressor) part 3 of the blade. The annular duct 6 (Figure 3), curved vanes 18 is divided into separate interblade channels 19 in the flow direction an increasing cross-sectional area. Channels 19 combine Mezhlopastnye annular slit 9 for blowing air into the boundary layer on the inner wall of the diffuser. At the rear diffuser has annular channel 7 for the second injection through the annular gap 8 of the outer air. Diffuser housing 5 through the power rack 10 is connected to a nacelle 11 that is above support 17. To rotate the nacelle together with a diffuser 15 there is a rotary support 16 and the turning mechanism.

Wind turbine operates as follows. With the help of hydraulic or electromagnetic actuator 14 is oriented wind turbine rotary device 15 in the direction of the wind. Wind flow energy acting on the blade 2, spins the windmill 1, the rotor of which rotates at a reference node 14, causing the multiplier 12 is carried out through rotation of the power generator 13. The atmospheric air flows into the diffuser 5, and In flowing on the peripheral portion of the blades 2. Peripheral 3 part 3 of the blades operate as low-pressure compressor grille and carry out supply freestream air slit in the annular channel 6. The relative movement (3) atmospheric flow accumulates in the profile of the compressor 3 at a rate of W 1 and leaves it at a rate of W 2. Receiving the peripheral velocity (speed of rotation of the vane) U, mezhlopastnye flow enters the channel 19 with the absolute flow velocity C then rotated by the curved vanes 18 in a direction close to the axle and its speed is reduced to a value required for the energy injection into the boundary layer on the inner surface of the diffuser to prevent separation of the main flow. Interscapular slit height h of the annular channel 6 (2) at the entrance of the annular slot 9 defined by the condition h> **, Where ** - Thickness loss of momentum in the boundary layer at the diffuser wall to the annular slit 9. Repeat energetic influence on the boundary layer is made by means of blowing secondary slot 7 of the outer air through the annular passage 8 downstream.

The ability of the invention is confirmed by the use of successfully operating wind turbines Vortec-7 (2) with two annular slotted blowing in air diffuser and wind turbines Caphorn 10 CH / POL (3) with a diffuser-type circular wing.

INFORMATION SOURCES

1. "Wind", Ed. D. de Renzo - Moscow, Energoatomisdat 1982, str.134-138, Figure 4.11.

2. Bruce Cole. New turbine could offer low cost wind power. «Modem Rotor Systems». August 1977 - p.27-30.

3. Windpower Monthly, vol.17, No11, November 2001 R.33.

CLAIM

Wind turbine with a diffuser comprising a wind turbine, a multiplier, an electric generator, a nacelle support apparatus with rotation mechanism and atmospheric diffuser in the form of an annular wing, on the inner wall of which there are two successive independent gap to an annular injection into the boundary layer of the external air, and wherein the first blowing carried peripheral part of the main flow of air entering into the wind wheel by means of exposure to the peripheral portion of the stream terminated compressor portions blades separated plates from the main turbine part blades and rotating in the recess of the diffuser housing, with subsequent delivery of air to the annular channel, situated under the inner the surface of the diffuser, curved vanes divided into separate channels interblade and ending the first slit injection.

print version
Publication date 31.01.2007gg