Analysis, Design and Validation of a Vaned Diffuser for Improved Fish Friendliness

Abstract The primary cause of mechanical-related fish injury and mortality in turbomachinery is blade strike. Fish contained the flow may strike with rotor blades fixed diffuser vanes, latter being a non-negligible factor causing damage pump system. In this study, an experiment-based correlation mutilation ratio acts as critical velocity. relation between vaned theoretical head presented function specific speed. As example, designed for single-bladed, mixed-flow impeller purpose improving friendliness. This can be scaled to operate up 14 m at peak efficiency, without diffuser. Subsequently, experiments are conducted show retained performance well great improvement