FLOW TYPE TURBINES EFFICIENCY ANALYSIS
Over the last years European-made flow type turbines have become widespread in small hydropower engineering. A distinctive feature turbines of this type is that at high heads (40m and more) the turbine works as an active one, and at low heads (3-40m) as a reaction one. In the operational zone, as an active, flow turbine and all its elements have constant efficiency equal to 81.85 per cent, independent of the design pressure head value. In the zone where the turbine functions as a reaction one, efficiency of the turbine and the gearbox depends on the design head. This paper presents dependences determining the efficiency of the aggregate and its elements, based on the systematically conducted statistical analyses.