2011 年 39 巻 3 号 p. 162-168
The aim of this study is to estimate of durability of environmentally friendly nano-hydraulic turbines. Three type turbines and a newly developed generator were tested in small gullies. All runners are open type which has minimal facilities for cheaper generation and less environmental disruptions. As a result, it was found that the bearing failures and troubles of overdrive units caused frequently. In addition, the direct coupled generator is useful for stable generation and improvement of runner performance.