To effectively utilize unused hydraulic resources in industrial and agricultural water systems, as well as in simple water supply systems, it is essential to further improve the performance of small hydro turbines. In demonstration tests, these turbines are sometimes operated at rotational speeds different from the design point due to various environmental factors. Therefore, in this study, we investigated the influence of changes in rotational speed on turbine performance and the associated variation in angle of attack distribution, based on numerical analysis results for a small hydroturbine with a diameter of approximately 50 mm. This report focuses on the relationship between rotational speed and the angle of attack distribution at each radial position, and presents the findings.
OZAWA et al. (Wed,) studied this question.