Optimization of Pump Turbines

For the purpose of optimizing pump turbines installed in pumped storage plants with regard to efficiency, cavitation, and excavation costs, a method of computation has been devised which includes a new system of determining type number and impeller outside diameter. An example employing data applicable to a modern pump turbine–Rodund 2(Austria)–reveals computed results that are well in conformity with actual values as regards the impeller outside diameter and operating data. The method of computation makes use of coefficients pertaining to viscous flow, cavitation, aerodynamics, and the geometrical dimensions of the runner vanes. Furthermore, special operational features of pump turbines are presented, the latter requiring additional considerations in design.