Performance Characteristics of High Speed-Type Cross Flow Turbine

概要

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High-speed type cross flow turbine was proposed by the present authors as one of the most desirable water turbine to utilize low head water energy resources and the results of the theoretical analysis of its performance characteristics were presented in the previous paper. This paper compliments the authors' proposition by the experiments that confirms the validity of the theory and by the extension of the theory examining the effects of dynamic stall and of draft-tube. The measurement of the rotor performance was carried out in air stream in a straight duct. Although the fragile structure of the rotor did not allow to conduct the measurement at sufficiently high Reynolds number, the obtained data were enough to support the results of the theory. The influence of dynamic stall of the rotor blades which inevitably takes place at designing tip speed ratio was reasonably taken into account. Furthermore, the effect of draft-tube which is indispensable for low head water turbine was also clarified.
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