Vertical wind turbine with self-limitation system of speed

摘要

The proper work of vertical wind turbine Savonius typed may be negatively influenced by very high wind speed. Usually the wind turbine speed is limited by means of a brake. The turbine speed is limited, but the spindle of the turbine is still subject of increased torque. The paper proposes a new, innovative technical solution that does not counteract increasing the turbine speed above a limit value, but prevents it. The new concept is based on dividing the blade of the turbine into several parallel vertical strips, properly displayed, as to form the shape of a conventional blade. Each strip can rotate against its own vertical axis, to change its orientation in vertical plane. This brings the benefit that when the turbine speed tends to overcome a certain value (dangerous for the turbine) the strips orientation changes, and the surface of the blade becomes a non-continuous one. The area of the blade that faces to the wind reduces, and prevents increasing the turbine speed. When wind speed slows down, the strips are guided back to their initial position by means of some springs. Reorienting the blades is based on centrifugal force generated of turbine rotation, so, it can be concluded that this forms a self-limitation system of turbine speed.