.OpenHPL.ElectroMech.Turbines.Francis .OpenHPL.ElectroMech.Turbines.FrancisThis is the Francis turbine model that gives possibilities for proper modelling of the Francis turbine.
The mechanistic model is based on Euler equations for the Francis turbine. Besides hydraulic input and output, there are input as the control signal for the valve opening and also output as the turbine shaft power and input as angular velocity.
There is also available the runner design algorithm that can define all geometrical parameters based on the nominal parameters.
The turbine losses coefficients
(k_ft1, k_ft2, k_ft3) can be also defined automatically.
However, if some dynamic data from real turbine is available it is better to tune
these parameters a bit more and use the defined values as a starting point.
A model for servo that that runs the guide vane opening is also available. Furthermore it is possible to automatically generate all need parameters for the servo, or simply specify them.
This mechanistic turbine model does not work really well for low loads (<10% guide vane opening).
However there is parameters that could be tuned for low load regimes.
These are u_min and k_ft4.
More info about the mechanistic turbine model can be found in: [Vytvytskyi2018] and about the servo (also turbine model) in: Resources/Documents/Turbines_model.pdf.