Rotary kinetic fluid motors or pumps – With means for controlling casing or flow guiding means in...
Patent
1990-08-03
1993-12-14
Look, Edward K.
Rotary kinetic fluid motors or pumps
With means for controlling casing or flow guiding means in...
415 42, 415 44, 415905, 415907, 416227R, 416227A, F03B 1506
Patent
active
052696472
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a rotor driven by wind power with a vertical rotating axis and radial arms distributed at uniform angular intervals over its periphery which bear bodies with an aerodynamic profile such that one side of the profile exhibits a lower air resistance with a current at right angles than with a current from the opposite side.
BACKGROUND OF THE INVENTION
With current attempts at using wind energy for power generation, the method used commonly at present is to provide rotors with a horizontal rotating axis with radial rotor arms which work according to the principle of a windmill or propeller. The disadvantages of these rotors lie in the high level of noise generated and the required large investment arising from the necessity to provide high towers to install the rotors. In addition, these wind rotors which are known in the art require electrical generating equipment or similar to be mounted at the top of the tower unless costly transmissions are provided.
A further disadvantage of wind rotors with a horizontal rotational axis is that they can only work if the wind current approaches them at right angles. This means that the rotors must always be turned into the wind by special equipment.
Furthermore, the profile of the rotors known in the art is difficult and time-consuming to achieve with the result that they can generally only be manufactured at high cost.
Rotors of the type mentioned in the introduction are known, for example, as Darrieus rotors. These rotors consist of approximately hyperbolically curved rotor blades attached to a vertical rotating axis. By their very nature, however, these rotors are not self-starting. This means that they must be started by a servomotor. Moreover, useful power is only generated at wind speeds above 5 m/s if Darrieus rotors are used.
Another vertical rotor known in the art is the so-called Savonius rotor. This, however, has a very large area exposed to the wind, as a result of which it is at great risk from storms. For this reason it is generally used on a small scale as a ventilator for the inside of enclosed vehicles where it is roof-mounted.
Rotors of the type mentioned in the introduction are also known in the art for measuring wind strengths. The generic aerodynamic profile for these is formed by open semi-spherical dishes. These rotors too offer a large surface area to the wind with the result that, when scaled up, they are unsuitable for energy generation.
A wind collector blade for a horizontal turbine rotating about a vertical axis was described in German Patent 3 517 752 C 2. This wind collector blade consists of two wing profiles which were positioned adjacent to each other at a given radial spacing, connected by arms and which encompassed a through-flow duct. The two wing profiles with their outer face contours are formed as parts of the outer face contour of a thick, self-starting wing profile, and the wing profiles with their straight, parallel or approximately parallel inner flanks delimit the through-flow duct mentioned above. Although this already known vertical rotor, in contrast to the Darrieus rotor, permits self-starting even at relatively low wind speeds, its rotation is unnecessarily hindered by the through-flow duct formed between the two wing profiles. In addition, the design of this rotor is very complicated because of the complex flow through and around it, and the manufacture of the rotor blades, particularly the relative location of the wing profiles to each other, is very demanding.
A generic wind turbine tower is known in the art from U.S. Pat. No. 4,430,044 where horizontal rotor arm sections and vertical rotor arm sections located at right angles to these at their ends are provided. In the case of this already known configuration of the rotor blades it is necessary, particularly for self-starting by the rotor, to design the rotor blade sections such that their alignment relative to the wind is adjustable. To this end, an elaborate control device is provided specially in accordance w
REFERENCES:
patent: 1740596 (1929-12-01), Hohlt
patent: 1835018 (1931-12-01), Darrieus
patent: 4012163 (1977-03-01), Baumgartner et al.
patent: 4115032 (1978-09-01), Lange
patent: 4204796 (1980-05-01), Pack, Jr.
patent: 4207026 (1980-06-01), Kushto
patent: 4236866 (1980-12-01), Zapata Martinez
patent: 4264279 (1981-04-01), Dereng
patent: 4293279 (1981-10-01), Bolie
patent: 4430044 (1984-02-01), Liljegren
patent: 4561826 (1985-12-01), Taylor
patent: 4624624 (1986-11-01), Yum
patent: 4808074 (1989-02-01), South
Development of 1 KW Vertical Axis Wind Generator, Conference Paper From Sun: Mankind's Future Source of Energy in New Delhi, India (Jan. 1978), by Guta and Chandra.
Look Edward K.
Mattingly Todd
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