抄録
An undershot cross-flow water turbine does not require a casing for open channels and hence considerable simplification is attained. We proved that shock loss at first-stage and second-stage inlet areas has a considerable influence on turbine performance in previous study. So, in this study, we changed the blades angle of straight turbine and investigated the effect of shock loss on its performance. Then, we changed the inlet and outlet blades angle of curved turbine appropriately and tried to performance improvement of this turbine. As a result, shock loss of curved turbine could be reduced and turbine performance was also improved. In addition, we found that flow field became better by changing inlet and outlet blades angle of curved turbine and flow field also has a considerable influence on turbine performance.
