With the Francis Turbine unit, "FME28", designed by EDIBON, we study the Francis turbines commonly used when we have average flow rates and heights.
This unit consists on a miniature Francis turbine. The water inlet flow is controlled by a valve situated in the Hydraulics Bench (FME00) or Basic Hydraulic Feed System (FME00/B).
It includes a distributor with adjustable guide vanes that allow for control of the water angle of incidence in the turbine. To adjust the turbine distributor, the unit has a lever on the front of the same. It also has a braking system, connected to two dynamometers, that allows to vary the load supplied to the turbine.
The inlet pressure of the turbine is measured with a manometer situated at the turbine inlet. The feed or spiral chamber is provided with a damping cover and two tubes to avoid water overflow. Its name indicates that it is spiral-shaped and for this reason it is known as snail chamber. Thanks to its design, the water flows at a constant velocity without forming swirls. This way, there are no load losses. The turbine’s axis velocity is determined by a tachometer.
- To determine the operating characteristics of a Francis turbine at different velocities.
- Determination of the typical turbine curves (operating mechanical curves and operating hydraulic curves).
- Turbine power output versus speed and flow rate at various heads.
- Effect of guide vane setting on turbine performance.