In the area with depopulation and declining birthrate and aging of the population, street lights maintenance cost is in the decrease direction. Also street lights are being removed. In the area without street lights, an accident happens that the elderly stumbles and falls over at night. Due to fractures, elderly is bedridden and there are cases where dementia advances and dies. Our research group is studying whether it is possible to maintain the street light by suppressing the electricity bill as much as possible. In order to realize this, we have been developing a micro-hydroelectric power generator. We are considering lighting street lights using this generated electricity. In this paper, we propose a more efficient model of the blade shape of the turbine and report on actual system aiming at improvement of torque.
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