A Study of the Effect of Submergence Upon the Efficiency of a Water Turbine: A Thesis (Classic Reprint) Hardback -

It has been the unsubstantiated opinion of many hydraulic engineers that turbines should never be placed below the tail water. They have held that this submergenoe causes a loss of from.fonr to eight percent in the efficiency of the plant, a loss which would sometimes mean the success or failure of a large plant. It has been the supposition of others that at small gate openings snbmergonoe might increase. The efficiency of the turbine. This idea was based upon the belief that the inflow, under submerged conditions at small gate openings, was changed from the impinging action of unsnbmerged condition to a flow similar to that of the reaction type of turbine with its resultant higher efficiency.

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