Specifically Francis turbines. I'm sure there is an ideal flow rate which gives the maximum efficiency, but if you had one flow rate to work with would there exist an ideal amount of applied load which would result in the most efficient conversion of energy? Say you kept all other things constant but changed the friction resisting the rotation of the turbine, would there be an optimal friction value that allows the maximum amount of potential and kinetic energy to be captured? Or would the most efficient design be the one with the minimum amount of friction?
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