Hydrokinetic / Wind JET
augmented turbine based
on Savonius rotor
Rotojet™ is a radically new concept of multy application technology, suitable
for application in both vertical and horizontal axis direct drive or geared
turbine generators:
ROTOJET
™ universal turbine blades are based on a revolutionary concept, the result of many
years of patent's development.
It was the world’s first
low noise and nature friendly commercial scale turbines to
generate electricity from low velocity turbulent
wind and the first to be used in wind farm
projects, hybrid PV-wind
farm and systems as well as forurban and small
scale power generation-
micro generation.
The
revolutionary new concept allows the system to achieve the following beneficiary
results:
Lift / Jet
propeller ROTOJET ™ turbine blades:
Good
start torque- Best performing at moderate and high wind speed. Operated at
both low and high winds.
Lift /
Drag / Jet ROTOJET vertical axis turbines:
Very good
start torque. Best performing at low and moderate wind speed.
Operated at
both low and very high or turbulent winds – ideal for urban application.
Thanks to
it the turbine efficiency increases up to 2 times the output capacity for both
lift and drag devices on the vertical, inclined and horizontal axis hydro / wind
rotors of axial and cross flow rotors.
All JET
augmented turbines are self starting machines at very low flow stream and have
significantly decreased noise pollution.
Through
extensive research has been discovered that curved endplate winglet at the tip
of a finite blade/wing can reduce the spanwise flow and thereby reduce the
induced drag. Unfortunately, to be effective, the endplate must be so large that
the increase in vetted area drag far outweighs any induced drag reduction.
That is why
we have developed a radical new tip blade solution simultaneously reducing the
induced tip drag and increasing rotational torque of the blade tip. We upgraded
blade tip by jet channels formed at the pressure (upwind) side of the tip wing
profile. The jet channels are forming a jet stream. The jet stream creates a tip
jet force Ftjet. The additional jet torque equals the following formula:
R x Ftjet
, where R is the rotor radius.
The
additional jet torque created from the air passing through the jet channel
increases overall turbine efficiency. The blade tip with jet channels we named
JET TIP.
The JET TIP
is a successfully applicable upgrade of both drags and lift propeller turbine.
It has been used as a universal solution for wind and water stream applications
on both vertical and horizontal blades.
The JET
blades are a successfully applicable of both one plane and 3D propeller turbine.
Also it has been used as a universal solution for wind and water stream
applications on both vertical and horizontal blades.
Space-efficient
propeller turbine concepts
Based on this concepts, smaller in size turbine could generate more watts for a
given swept-area, no matter by using a diffuser, or 3D rotors.
3D Rotojet™ is a new space-efficient technology of flow energy extraction by
wind and hydrokinetic propeller turbines. The main advantages of 3D JET rotor
vs. one plane (2D)
JET rotor are summarized below:
Larger rotor swept area (3D
surface vs. 2D surface) based on the same outer diameter
Larger swept area harness
more fluid kinetic power – more power output and bigger generator capacity
factor per unit mass
3D rotor performs better at
high turbulence flows
3D swept area avoided rotor
turbulence stress and rotor rotates smoother
3D rotor better performs in
interaction with jettip blades
3D rotor promotes an
intensive longitudinal vortex that reduce down stream flow resistance –
relative increase flow velocity passing trough rotor, respectively increase
turbine RPM/power
Diffuser augmented turbine is a well known space-efficient technology of flow
energy extraction by wind and hydrokinetic propeller turbines.
The main
difficulty of the known diffuser augmented turbines is that requires long, heavy
and costly diffuser in wake turbine flow.
But,in the worst
case, a given shroud could increase power factor Cp by 1 or 100% (over 2 times
in comparison with non shrouded machines). Diffuser augmented turbine cost
80-100% more in price as well as logistics, whereas a shroud could be fabricated
and added onto a given turbine at less than 30% of those costs. Rotojet™ concept
of both 2D and 3D rotors is cost effective because JET augmented rotors requires
about two times shorter diffusers and power factor is increased about 2.5 times
in comparison with non shrouded non JET rotors.
