Abstract
1. The “ideal” guide vanes of a reaction turbine realized in the form of dual-regulation guide vanes maintain impact-free entry of the flow into the runner's blading in a wide range of regulation of the turbine's flow rate. 2. On account of this, the optimum operating conditions (maximum values of efficiency and minimum hydraulic losses) will be maintained in practially the whole range of change in the turbine's power, since the conditions of impact-free entry, efficient passage of the flow in the runner's blade cascade, and normal exit from the runner characteristic of the optimum conditions will be maintained. 3. The use of dual-regulation guide vanes will make it possible to abandon use of dual-regulation (Kaplan) turbines and switch to the use of ecologically clean propeller (rigid-blade) turbines, which possess high speed and capacity while preserving their energy qualities; and in single-regulation turbines, to get a significant increase in average efficiency and generation of electricity at hydroelectric stations.
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