In order to increase the performance of a commercial wind turbine,
manufacturers have increased the dimension of the rotors. For multi
megawatts size machines, the major constraints are the transportation
difficulties and the cost of the blades. This cost rises sharply for
lengths above 45 m and becomes prohibitive for blades over 60 m. The
weight of a blade is proportional to R^2.3 while the power generated
is proportional to R^2 (where R = length of blade). Therefore, over
a certain length, the price of a blade rises much faster than the
power increase advantage.
Eotheme proposes an
innovative cost-effective solution: counter-rotating rotors connected
to an electrical generator by a simple patented power transmission device.
All other components of our wind turbine concept remain unchanged except
the blades shape and the control system. Computational fluid dynamics
(CFD) in conjunction with field test will improve our understanding
of aerodynamics phenomena with counter rotating turbines: this is our
major technology challenge.
Our new concept enables the rotors to
harness maximum energy from the available wind and has some significant
Effective reduction of electricity cost by 25%
Lower loads in cinematic chain (lowering mechanical
Simple two stage gear box (instead of 3 stage) and
lower maintenance cost
Enhancement of “farm power density”
(i.e. more power and revenue from the same surface of wind farm
or same infrastructure cost).