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Photo Detail of Francis Turbines' (1): |
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Francis Turbines'
These types of turbines are suitable for a wide range of water heads, normally from 10 to over 300 meters. This type of machine can also be used where the water head varies, even with per-centages exceeding 50%,of nominal, for lake level fluctuation or in an aqueduct due to the effect of the growing head losses from capacity used.
The capacity may also change and still keep a high level of working efficiency and reliability. However, it is advisable not to go down to levels below 35-40% of the designed machine values.
The Francis turbine may also be produced with a single runner or in some cases with double outlet runner, opposite to each other with a single spiral casing.
In this case, the wheel will be symmetrical and each half is calculated at 50% of the total machine carrying capacity. This makes it possible to increase the speed of the machine with evident cost saving also for the generator.
For further information about this product, click here.
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