A total of 1253 live cyprinids and eel are exposed to a centrifugal pump to study fish damage rates in a wide operating range. The observed types of injuries were consistent with a mechanical cause of damage. The measured mortality rates for cyprinids show a fair agreement with a blade strike model based on empirical data by EPRI. Analysis of the experiments with eel led to a new correlation for the blade mortality ratio for this species: lethal injury rate is shown to be zero up to a strike velocity of 8 m/s, and increases linearly to 42% for a strike velocity of 15 m/s. Use was made of video recordings that provided valuable information on the orientation and distribution of fish approaching the impeller. Results are presented using a new method to visualize fish mortality of a pump in its entire operating range, in graphs of head versus flow rate. The theory of pump hydrodynamics is used to derive a method to scale results of fish damage rate, either obtained by a model or by experiments, to different pump sizes, shaft speeds, or fish lengths. This will prove essential for a valid interpretation of pump experiments with fish.
|Journal||Canadian Journal of Fisheries and Aquatic Sciences|
|Publication status||Published - 2014|