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Axial unit

Axial flow turbine units

A xial-flow Kaplan turbine have developed flourishingly and extended greatly. It has high specific speed. If this kind turbine and Francis turbine operate on the same condition of water head and capacity, its specific speed will be twice than the latter. Based on this reason, the size of the unit can be reduced. If runner blade and gate operating mechanism acted together, its mean frequency will be higher than Francis turbine, even more during the loading zone. So it is more proper to low water head station and the power station with great changing load. The specific speed range is n_s=200~850 in general and the water head is H=3~80 meters.

The large axial flow fixed-blade turbine was produced seldom in nation. It is easy to manufacture because of its simple structure. In additional, compared with adjustable blade turbine, its specific speed and the cavitations performance have been improved and became better because it has the fixed-blade and small hub ratio.