DE102007058274A1 - Sheath current wind converter has gear unit, propeller hub and sheath, which are arranged at upper section of main tower, where sheath is fixed at gear box and encloses external area of single propeller blade - Google Patents

Abstract

The sheath current wind converter has a gear unit, a propeller hub (5) and a sheath (4), which are arranged at an upper section of a main tower (1). The sheath is fixed at the gear box. The sheath encloses an external area of single propeller blade (3) in such a manner that the distance between the pivoted points and single propeller blade inside the sheath is 50 centimeter.

Description

The The invention relates to wind turbines of all sizes for converting wind energy into electrical and other forms of energy based on the renewable energy of the wind with high conversion efficiency especially for wind-weak areas and low specific Investment.

As known, the efficiency of large modern systems is max. 40-45%, ie less than half of the available wind energy can today be converted into electrical energy in modern plants. Even an optimally designed propeller can (after Albert Betz, www.braun-windtechnik.de ) theoretically convert only 59.3% of the available wind energy into electrical energy.

It made many efforts to minimize losses; she but so far could be only slightly reduced.

Mainly at the outer ends of the principles of a Aircraft wing designed rotor blades of a Wind converter, where the main part of wind energy available is, the biggest energy conversion losses occur by unwanted eddies on. When aircraft construction has here to reduce the so-called induced resistance Endplates, winglets or even streamlined designed Fuel tanks arranged.

In DE 195 26 718 A1 a device is described with which this vortex formation is to be prevented by the arrangement of a ring arranged at the wing ends. However, it was not considered that the vortex formation caused by turbulence far behind the wing tips, seen in the wind direction, the energy losses and the required reduction in wind speed in the outer area of the rotors / wings is not achieved.

In G 9218214 341 describes a wind converter which is a paraboloid Wind deflector with wind deflectors has and continue the individual rotor blades with an annular Sheath is provided, which opposes the Windausströmrichtung from the end of the rotor blades attached to it over extends the end portion of the wind deflector. The width the annular sheath is 1/5 to 1/4 of the rotor diameter.

Also It was not recognized here that the energy conversion losses in the Essentially from the wake vortices in the outer area of the Rotor go out and then extend very far in the flow direction and a multiple of the rotor diameter.

In DE 2949057 A1 a wind turbine for a wind power plant, in particular for a small power plant is described which has a plurality of wings and an outer ring. The outer ring has a width, seen in the flow direction that it projects axially over the wings.

Also With this solution can be the energy conversion losses Lower only insignificantly on the outer edge of the rotor.

The The object of the invention is to provide a device and a Method of operating same the energy conversion losses in Rotor outside area of a wind converter with the application drastically reduce the bypass principle and one of the respective Flow velocity of the wind optimally adapted Achieve energy yield.

According to the invention solved the problem by the fact that the rotor of the wind converter equipped with a fixed coat consisting of several Segments can exist and the fixed on the rotatable tower of the wind converter is connected with appropriate brackets. The cross section of the Mantels has the profile of an aircraft wing or any other suitable shape and may be in length and the shape of the profile through internal electronically controlled Elements be made changeable. The established, Cloak attached to the tower of the converter can be used be connected by means of joints at the end of the struts that over the segmental design of the rear shell part seen in the flow direction, an enlargement / reduction of the Wind outlet surface of the changeable Mantelendteiles cause.

Of the Distance between the tips of the rotatably mounted and in their Anstellwinkel changeable single propeller blades and the inside of the jacket is 1 to 50 cm.

On the propeller hub are rotatable 3-36 single propeller blades rotatably arranged at the outer end immediately on the fixed jacket front a width of up to 1/5 of Own propeller length and the longitudinal design of the single propeller, preferably that of the propeller design more modern Turbopropantriebe corresponds to wide-body aircraft.

The arranged around the propeller coat can adapt to wind conditions in the end part by internal drives in its length in the flow direction by arranged at the end of the shell extendable profile elements to be extended by 0.5 to 2.5 times.

at the preferred embodiment of the overcurrent wind converter are the end parts of the shell at an angle to the overall chord of the Mantels in the range of ± 30 ° viewed from the pivot point changeable to the wind conditions accordingly maximize the achievable efficiency in energy production to be able to.

Of the Jacket of the bypass current wind converter according to the invention can in one embodiment of a completely rigid annular body and exist In addition, the possibility of setting have different opening angles.

The Control of the wind outlet surface of the jacket of the bypass current wind converter depending on the wind speed takes place in Connection with the angle of attack of the single propeller blades automatically.

In a separate embodiment, the inventive Sheath flow wind converter designed so that the propeller hub, Propeller blades and mantle viewed downwind are arranged in front of the transmission housing and the jacket holder over the movable part of the jacket extends and at the end part of the Gearbox is attached.

Under certain wind conditions, especially in areas where very stable wind conditions in strength and dominate direction is also a completely rigid ring-shaped Sheath and with only one fixed opening angle of Mantels possible.

following the invention is based on an embodiment in the attached sketches explained in more detail.

It demonstrate:

sketch 1: A schematic longitudinal section through the invention Ducted wind converter

sketch 2: The front view according to sketch 1 in wind outflow direction seen

The sheath current wind converter consists of the tower ( 1 ) at its upper part via a pivot bearing ( 7 ) the transmission housing ( 2 ), the coat ( 4 ) and the propeller hub ( 5 ) with the individual propeller blades ( 3 ) are arranged.

The coat ( 4 ) with its movable individual elements ( 8th ) is by means of three or more struts ( 6 ) on the transmission housing ( 2 ) and is automatically connected to the entire upper part of the bypass flow wind converter via the pivot bearing ( 7 ) always aligned in the wind direction.

The individual elements ( 8th ) at the rear end of the jacket ( 4 ) are with swivel joints ( 9 ) such that the wind opening angle of the rear part of the shell ( 10 ) can be changed in the range of 0-30 °. The individual elements ( 8th ) are with a favorable flow configuration of the rear part ( 14 ) of the front shell segment ( 4 ) arranged such that the cross section of the entire casing profile always forms an optimal flow profile with minimal flow losses. An electronic control unit ( 11 ) optimizes wind speed, angle of attack with the swivel ( 9 ) equipped single wing ( 3 ) and wind angle ( 10 ) of the jacket ( 4 ) about the individual elements ( 8th ).

For certain wind conditions may be appropriate be to dispense with the movable end part of the coat, and a rigid simple construction only with a fixed opening angle to use the coat.

The drive ( 12 ) for the adjustment of the individual elements is located in the front shell part ( 4 ).

The one with the movable single elements ( 8th ) variable opening circle ( 13 ) of the jacket ( 4 ) allows optimal use of wind by means of the entry surface ( 15 ) and the one with the opening circle ( 13 ) variable exit surface due to the low-loss reduction of wind speed

1

tower

2

transmission

3

propeller blade

4

coat

5

propeller hub

6

pursuit

7

pivot bearing

8th

individual elements coat

9

swivel

10

Wind angle

11

control unit

12

drive

13

opening circle

14

rear jacket part

15

entry surface

16

pivot bearing propeller blade

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 19526718 A1 [0005]
• DE 2949057 A1 [0008]

Cited non-patent literature

• - Albert Betz, www.braun-windtechnik.de [0002]

Claims (9)

Mantelstromwindkonverter, characterized in that the upper part of the main tower, rotatably mounted, gear, propeller hub and attached to the gearbox by means of struts fixed jacket are arranged, and that the gearbox attached by means of struts coat the outer region of the single propeller blades so enclosing that the distance between the The tips of the rotatably mounted and changeable in their pitch individual propeller blades and the inside of the jacket is 1 to 50 cm. Sheath flow wind converter according to claim 1 and 2 characterized characterized in that on the propeller hub 3 to 36 single propeller blades are rotatably arranged and that these on their outer End immediately on the fixed jacket front part a width of have up to 1/5 of the propeller length. Sheath flow wind converter according to claim 1 and 2 characterized characterized in that the end portions of the jacket at an angle to the total chord of the jacket in the range of ± 30 ° from the fulcrum considered changeable. Sheath current wind converter according to claim 1 characterized characterized in that the cross-sectional profile of the shell the profile corresponds to an aircraft wing and the end part of Mantels in the flow direction consists of individual elements which has an articulated connection with the front of the Mantels, the exit surface of the wind from the mantle are connected enlarging and reducing. Sheath current wind converter according to claim 1 characterized characterized. that the coat of a completely rigid annular body with the cross section of a Wing but there is the possibility of adjustment having different opening angles. Sheath flow wind converter according to claim 1 and two characterized in that the mantle one from the aircraft wing may have different shape. Sheath flow wind converter according to claim 3 characterized characterized in that the length of the jacket in the flow direction by arranged at the end of the shell extendable profile elements adapted to the wind conditions, extended by 0.5 to 2.5 times can be. Sheath current wind converter and method of operation thereof according to the preceding claims, characterized that the wind outlet depending on the wind speed in connection with the angle of attack of Single propeller blades are controlled automatically. Sheath current wind converter and method of operation thereof according to the preceding claims, characterized that the propeller hub, propeller blades and sheath in Seen wind direction are arranged in front of the transmission housing and the jacket holder over the moving part of the jacket extends and attached to the end part of the transmission housing is.