Conclusions
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1.
The presence of grooves for installation of the maintenance gates in the lateral walls and pier of an elbow draft tube diffuser, with the roof opening tightly closed by means of a special plug which ensures a plane surface, practically does not affect the power characteristics of the turbine.
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2.
The presence of an uncovered opening leads to a deterioration of the power characteristics in the principal operating zone of the turbine regimes. The closer the roof openings are to the turbine axis, the more significant the efficiency decrease, the discharge capacity, and the power output of the turbine.
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Translated from Gidrotekhnicheskoe Stroitel;stvo, No. 9, pp. 10–13, September, 1973.
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Mikhailov, I.E., Mityurev, E.L., Kazennov, V.V. et al. Effects of grooves and openings in the roofs of elbow draft tube diffusers on the power characteristics of Kaplan turbines. Hydrotechnical Construction 7, 830–834 (1973). https://doi.org/10.1007/BF02377161
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DOI: https://doi.org/10.1007/BF02377161