Which parameter is most important ?
How can we judge whether an given Francis turbine is good or not?
What is the optimal conditions for design of Francis turbine?
The most important parameter for all types of water turbines is the specific speed.
Of course, a turbine is perfect if you have a high efficiency in a wide range of variation of parameters (flow and head). Already installed turbine must operate without cavitation or at an early stage.
Hi! If you are considering selection of type of Francis turbine then Speed Number and Or specific speed is very important.
When you are evaluating the design of turbine then its ability to operate at various load and flow condition along with resistive nature to erosion and cavitation is another essential prospect.
The optimum condition for selection of Francis turbine is the specific speed or speed number ( function of head flow and speed) should match the required range of operation.
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