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Francis inlet scroll at the Grand Coulee Dam Side-view cutaway of a vertical Francis turbine. Here water enters horizontally in a spiral-shaped pipe (spiral case) wrapped around the outside of the turbine's rotating runner and exits vertically down through the center of the turbine. The Francis turbine is a type of water turbine.
Turbines are sometimes differentiated on the basis of the type of inlet flow, whether the inlet velocity is in axial direction, radial direction or a combination of both. . The Francis turbine is a mixed hydraulic turbine (the inlet velocity has Radial and tangential components) while the Kaplan turbine is an axial hydraulic turbine (the inlet velocity has only axial velocity componen
The power station can be accessed either by an elevator or a tunnel. The plant has 16 Francis turbines, divided into two sets of eight each, and separated by a mounting area, workshops, control room, elevator shaft and ventilation system. The turbines were built by two partners of James Bay Energy (SEBJ).
Its runner shape was similar to that of a Francis turbine. In 1849, James B. Francis improved the inward flow reaction turbine to over 90% efficiency. He also conducted sophisticated tests and developed engineering methods for water turbine design. The Francis turbine, named for him, is the first modern water turbine. It is still the most ...
The penstocks connect to Plant 2 which is located on the right bank of the Snoqualmie River. It houses a 13.7 MW and a 26.5 MW Francis turbine-generator. Water discharged from Plant 2, at a rate of up 1,800 cu ft/s (51 m 3 /s), immediately enters the river. [11] [16] [17]
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