2020 Volume 19 Issue 4 Pages 307-312
For the development of a vertical axis turbine, the elucidation research of the mechanism related to the fluid engineering operation of the turbine plays an important role. As a solution to the problem of improving the startability of the lift type turbine, a combined type or a hybrid type using a drag type has been proposed. The torque component in the lift generated by the blade is important for realizing the startability and performance improvement. If attention is paid to the blade element, the direction of the lift line due to the deflection of the surrounding flow field is one of important factors. In other words, the adoption of a Savonius type drag turbine for the reason that the performance is excellent alone is meaningless. The author devised a drag turbine with a cylinder with improved starting torque and hybridized it with a straight blade Darius turbine. In this report, the performance characteristic of a hybrid turbine is considered in relation to the flow field generated by an inner drag turbine.
