Characteristics of bulb turbines during their operation in reversible regimes
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Investigations have shown that when ordinary bulk turbines are used in pump regimes there occurs a divergence in the optima of efficiencies with respect to the reduced rotational speed, which decreases with decrease of the specific speed.
The results of experiments make it possible to determine the values of the main parameters during reversible operation of a horizontal bulb unit. In pump regimes the reduced axial force considerably exceeds the corresponding values in the turbine zone of the universal characteristic; with a position of the regulating devices corresponding to the maximum efficiency in the pump regime it is minimal for the given type of runner.
The data obtained can be used when designing reversible bulb units and in calculations of transients and optimization of regulating regimes.
KeywordsEnergy Source Rotational Speed Power Generation Main Parameter Axial Force
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