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
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
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.
of the problem.
Kinetic energy of
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
Disadvatages in connection with use
of stationary aero-hydrodynamics:
- Low efficiency
kinetic energy extraction of
stream and a wind (10-40 %).
- Hidro and wind-generators start to work
only since rather high speeds of
streams and a wind.
- The ends of blades of the screw move with
very big speed that leads to failure of a flow and
and to failure of a flow and to supersonic
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
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
- Centrifugal forces will move an accumulating stream to edges of
the screw thus reducing operating ratio of energy of
- 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
- 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 Мвт.
- 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
will not solve world power problems in a large scale!
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
) has created the hydrogenerator
extracting energy of a undercurrent with the help of a
Extraction energy of
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!!!
have put in pawn the beginning of an era of new type hydro and wind- generators! These
works have the big prospect!
with oscillating wings have the following advantages:
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
stream with the help of
oscillating wing is higher, than at usual screws (see fig. 2).
Fig. 2. Distribution extraction energy from
stream along the blade of the rotating screw and along a surface of a varying
Absence of high speeds on the ends of a
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
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.
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
hydro and wind-generators is put in the field of nonlinear
oscillatory aerohydrodynamical modes and designing of the device, as uniform
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
In Ocean Power
Technologies, Inc., Energy Harvesting Eel Program
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.
In Norway, in Ocean As
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
Oscillating mobile surface
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
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
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
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
Our production and services on
hydro generators extracting energy of waves.
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