Abstract
A Darrieus-type cross-flow water turbine has been proposed by the authors for utilizing undeveloped low-head water power resources, but available data for good hydrodynamic design of it are still scanty. Here, effects of geometrical attitude of runner blade o hydrodynamic performance of turbine are investigated experimentally and discussed in comparison with theoretical results obtained by the method proposed in the preceding paper. Experimental results supported the theoretical concept that the geometrical attitude of runner blade can be specified by a single parameter, and the best efficiency was obtained when the chord line of NACA0030 aerofoil was in contact with the pitch circle tangentially at 40% chord point. Comparing the calculated results with the measured data, the geometrical attitude of blade for the best runner efficiency is identical and the shape of time variation in runner torque is similar in both the calculation and the measurement, while quantitative agreement is still insufficient.
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