Abstract
Influence of sectional shape on power characteristics of open cross flow type micro water turbine was investigated by model experiments. An increase of number of blades caused improvement of turbine efficiency. Ratio of inner diameter to outer diameter of a turbine hardly influences on turbine power characteristics. Efficiency of large turbines was higher than small ones. Following two effects were confirmed by field tests. (1) Scale effect: Efficiency obtained by field tests using a turbine with a diameter of 1.2m was higher than model tests. (2) Suppress effect of overload: Maximum generated power showed a tendency to be suppressed for a condition supposing over discharge.
