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Innovation & Potential
The newest scientific research data indicate, that the Savonius rotors can achieve coefficients of up to 0.47, by optimizing the form of the blade and the guiding apparatus, according to the performed calculations.
Numerical calculations of different aerodynamically effective formations were only possible in recent time, as a result of the increased computer performance, since these calculation processes require, even in the case of the most modern computer systems, calculation times of several weeks, for each individual optimization step.
Flow calculations and studies based on real models in the wind channel indicate that, based on these measures, there is a possibility of creating a aerodynamically hybrid system, which combines the robust characteristics of a pure resistance device with the increased performance of the lift effect. Based on this, it becomes possible, at high speeds of about 1, to achieve a power coefficient of over 0.4.
The Savonius turbine, has the potential, based on this performance, to prevail economically and technically in the field of small wind generators over the currently widespread three-blade, horizontal axis generators.
In addition to its simple structure (manufacturing and maintenance costs), there are additional advantages based on the design (no tower with costly foundation, systemic overload protection, low maintenance, ease of maintenance by ground-based equipment, low noise level as a result of the low level of rotation, no changing shadows – “disco effect”, etc.) which support the use on flat rooftops of skyscrapers, shopping centers, warehouses and agricultural buildings.
Also, based on the low noise emissions, there is a possibility of using it in residential and mixed areas. In case of installation heights of under 10 m, in many countries, the installation does not require any authorization.
Obviously, there is enough undeveloped potential in this field.
The object of business of the modulbluE GmbH is, among other, the development, construction and distribution of such small wind generators, according to industrial standards.
(Principle) Images of an optimized Savonius rotor (view from above):