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Wind- Hydrogenerators with oscillating working bodies





Key words: renewed power, renewed energy sources, alternative power, hydrogenerators, extraction energy with the help of a flapping wing, energy of tidal stream, wind power, energy of waves.

On the Earth there are many places where there are constant currents (underwater sea and ocean tidal stream sea and ocean, currents of the rivers). There are zones of the seas and oceans possessing a more potential of energy of sea waves. Also there are zones with often winds. For extration kinetic energy of these energy sources numerous types hydro and wind-generators are created and developed. But wide introduction of these energy sources is restrained by their small efficiency, high cost and technical disadvantages of their design.

There exist some locations, where winds, ocean waves and tidal stream are permanent phenomena. Kinetic energy of these sources is retrieved traditionally by specially designed work bodies as mills, for example. Development of energy transformers is based on physical processes of a classic aerodynamics, which results in low effectiveness. It can be changed with employment of processes based on non-linear oscillatory aerodynamics.

State of the problem.

Kinetic energy of tidal stream, waves and wind is usually extracted with the help of traditional working bodies (turbines, screws, etc.) and development of converters of energy is based on use of physical processes of classical stationary aero-hydrodynamics. As a result of it these converters of energy have low efficiency.

Hundreds firms make gidro and wind-generators different type with rotating working elements (turbines, blades, etc.). But the big selling for these renewed energy sources is not present. There are a lot of reasons:

1. Disadvatages in connection with use of stationary aero-hydrodynamics:

- Low efficiency of kinetic energy extraction of tidal stream and a wind (10-40 %).

- Hidro and wind-generators start to work only since rather high speeds of tidal streams and a wind.

- The ends of blades of the screw move with very big speed that leads to failure of a flow and formation kavitation in water and to failure of a flow and to supersonic speed in air.

2. Design disadvantages.

- The rotating blade can have the greatest possible operating ratio of a kinetic wind power (tidal stream) at the given angle of attack of the blade only for the certain speed of a wind (water). Under the speeds which are higher or lower than this speed, the operating ratio of a wind power sharply falls. Also the angle of optimum attack should be selected specially on scope of the blade (it is in part carried out with the help of a special configuration of the blade). As a result of it the operating ratio of a kinetic wind power falls and the low operating ratio of a wind power or tidal stream turns out.

- Even at an optimum angle of attack of each element of the blade selection of energy of an accumulating stream decreases as approaching the center of the screw. As a result the central area of the screw is ineffective in extraction of tidal stream energy.

- Centrifugal forces will move an accumulating stream to edges of the screw thus reducing operating ratio of energy of tidal stream.

- Speed of revolutions of blades is very low. Reducers are required to increase revolutions up to the sizes necessary for the electrogenerator. It leads to to complication, weighting, rise in price and downturn of reliability of a design.

- Special devices for turn of blades in position are required at the big speeds of a wind. It leads to complication and rise in price of a design, downturn of its reliability.

- Special devices for orientation of the screw downwind are required. All this leads to complication and rise in price of a design, downturn of its reliability.

- The big laboriousness and cost of manufacturing of blades of the screw.

- In connection with the big range of change of speeds, pressure, volumetric speeds of course of air or water many standard sizes wind-hydrogenerators and pumps are issued.

- Modern types of designs wind generators do not allow extract capacity above 10 .

3. Operational disadvantages. - Big dimensions.

- Wind-generator create a low-frequency acoustic field on frequencies above frequencies of rotation of blades (blade frequency).

- Hydro-generators quickly reel up seaweed on the blades, fishing nets and as a result of this fail. Rotating blades are very dangerous to people and animals.

If this disadvantages are not eliminated, level of research and design works is not lifted then manufacture of wind-hydrogenerators will not solve world power problems in a large scale!


Advanced achievements.

Extraction kinetic energy of currents with the help of oscillating wing.

Many of these limitations are absent in wind / hydro generators, which are used oscillating wings in order to use kinetic energy of run against streams. Attempts to create same principle sources of renewable energy took place before, but their success level was low due to limited knowledge of aero-hydrodynamics principles of oscillating wings (blades) and poor design structure. Negative impact is also caused by prejudice resulted from view of the technology as exotic. Current trends are surely reversing.

For the first time in the world, English firm The Engineering Business Ltd ( http://www.engb.com ) has created the hydrogenerator extracting energy of a undercurrent with the help of a oscillating wing.

Extraction energy of tidal stream with the help of a oscillating wing (the project Tidal Stream Generator Stingray of The Engineering Business Ltd )
In 2002 first aggregate of this kind was submerged, and has acted successfully for a year and generates 150 kilowatts. In 2004 Company plans to submerge second aggregate near the coast of Scotland with output of 5 MW.

Achievements The Engineering Business Ltd are tremendous success!!!

These works have put in pawn the beginning of an era of new type hydro and wind- generators! These works have the big prospect!

Hydro and wind-generators with oscillating wings have the following advantages:

All surface of wing participates in selection of energy from a stream in regular intervals covered (see the right part fig. 1). As against it, the surface of the screw participates non-uniformly (see the left part fig. 1). Therefore, the operating ratio of energy of tidal stream with the help of oscillating wing is higher, than at usual screws (see fig. 2).

Fig. 1.
Fig. 2. Distribution extraction energy from tidal stream along the blade of the rotating screw and along a surface of a varying wing.
  • Absence of high speeds on the ends of a wing.
  • The plant of hydroelectric power stations is without dam. It reduces the price and accelerates creation of these power stations very much.

  • The angle of attack can easily be established in an optimum mode. Due to this, the high effectiveness ratio is supported at any speed of a stream.

  • It is managed easily and can be coordinated to a microprocessor control system. It is easy to carry out optimum managements.

  • Construction of orientation on a stream of water or downwind is easier.

  • The simple coordination of oscillation of a wing with pumps and devices of oscillatory type.

  • It is less sizes on height; it will easily be coordinated to a horizontal relief of the ground or a river bed.

  • Absence of noise on blendal frequencies.

  • High reliability.

  • Simplicity and cheapness of a design. At use of hydraulics or a pneumatic the reducer is not required.

  • Opportunity of manufacturing as modules, and their compact installation.

Existing hidro and wind-generators practically have reached the limiting values of efficiency.

Hidro and wind-generators with oscillating wings as firm The Engineering Business Ltd develops, have very big opportunities to increase efficiency and quantity of extracted energy, and also reduction of cost.

It is possible to develop essentially success of application of oscillating wings of firm The Engineering Business Ltd. In a basis of our high technologies, work hydro and wind-generators is put in the field of nonlinear oscillatory aerohydrodynamical modes and designing of the device, as uniform oscillatory system.

Our production and services on hydrogenerators with oscillating wings and other working elements.

Our production and services on wind-generators with oscillating wings and other working elements.

Extraction kinetic energy of currents with the help of a oscillating plate. Numerous attempts extraction a kinetic wind power or tidal stream of water with the help of mobile working elements of a various design are known. For example.

In Ocean Power Technologies, Inc., Energy Harvesting Eel Program http://www.darpa.mil/dso/trans/energy/pa_opt.html develop energy sources, which extract kinetic energy of sea currents with the help of oscillating deformable plate. Sea currents flow round a rigid motionless plate after which the vortical path is formed. This vortical path flows round a plate which surface can be bent under influence of these vortexes. Mechanical energy is gathered from a forward edge of this plate.

Energy Harvesting Eel Program

In Norway, in Ocean As firm http://www.inocean.no/eel/index.html works on extract energy of tidal stream, with the help of a oscillating multilink mobile surface are conducted. Mechanical energy is gathered from the first link, through angular oscillations of a vertical axis.

Oscillating mobile surface [Ocean As]
Oscillating mobile surface [Ocean As]
Works of these firms are very important and have big prospects. However, all these devices have a number of essential disadvantages:

  • Ineffective extraction kinetic energy from an accumulating stream. Extraction energy of a stream, occurs in process of motion of water along a surface of a plate. As a result of it, the amplitude of oscillation along a plate or along other deformable surface increases. As a result, the greatest energy collects on the end of these devices! However, energy in these devices is gathered from a forward edge, instead of back! Therefore, the designs of working body offered above are ineffective, in case of extraction and transferring of energy to electric generator.
  • Ineffective gathering and transfer of energy from energy accepting elements (plate, parts of a plate) and transfer of this energy to the electric generator. On a plate mechanical energy is transferred to the end of plate. And on the contrary it is required that this energy was transferred from the end of a plate to its beginning and it was transferred there to the electric generator. The multilink system (a plate consisting of articulate elements, etc.) is the bad transmitter of mechanical energy.
  • Multilink mobile devices are very sophisticated, expensive and unreliable devices at operation in sea conditions.
It is possible to develop essentially success of these works further. In a basis of our high technologies, work of the hydro generator is put in the field of nonlinear oscillatory hydro dynamical modes, and, designing of the device, as uniform oscillatory system.Our production and services on hydrogenerators with oscillating working elements along a stream.
Extraction kinetic energy of sea waves. In Ocean Power Delivery Ltd developments of the system which extracts energy of sea waves are carried out (project Pelamis) http://www.oceanpd.com . The system will consist of the cylindrical floats connected with each other by hinges.

Project Pelamis
Works of this firm are very important and have the big prospects. However, devices of such type have a number of essential lacks:

  • Low level of energy extraction of waves because of weak knowledge of hydrodynamical interaction between wave and oscillating cylindrical body.
  • Ineffective gathering and transfer of energy from elements of reception of energy (cylindrical floats and so on) and transfer of this energy to the electric generator. The multilink system (cylindrical floats connected with each other by hinges, etc.) is the bad transmitter of mechanical energy.
  • Multilink mobile devices are very sophisticated, expensive and unreliable devices at operation in sea conditions.
It is possible to develop success of this work essentially. In a basis of our high technologies, work of the hydro generator is put in the field of nonlinear oscillatory hydro dynamical modes and designing of the device, as uniform oscillatory system.

Our production and services on hydro generators extracting energy of waves.
High potential renewed energy sources









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: 2004-08-04 (3443 )

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