Abstract
The final purpose of this study is to develop a water turbine appropriate for low-head open channels in order to effectively utilize the unused hydropower energy. The application of the cross-flow runner to open channels as an undershot water turbine has come under consideration. However, the flow field of undershot cross-flow water turbines possesses free surfaces. This means that with the variation in the rotational speed, the water depth around the runner will change and flow field itself is significantly altered. Thus it is necessary to clearly understand the flow fields with free surfaces in order to improve the performance of this turbine. In this study, the performance of this turbine and the flow field were studied through experiments and numerical analysis. The particle image velocimetry (PIV) technique was used for flow measurement. The experimental results on the performance of this turbine and the flow field were consistent with the numerical analysis.
