| 摘要 |
PROBLEM TO BE SOLVED: To improve power generation efficiency of a spiral hydraulic turbine with a generator housed therein.SOLUTION: A spiral hydraulic turbine 12 is provided with a spiral blade 30, and a hollow shaft 32 which is provided with a power generator 40 inside and the spiral blade 30 on its outer periphery to rotate by a water flow directed from a downstream side to an upstream side, and which is formed at a portion where the spiral blade 30 is provided to be reduced in its diameter toward the downstream side. |
