- Type of turbine used
- Material of turbine blade
- How the turbine function
- Environment issue
Flowing water is directed on to the blade of turbine runner, creating a force on the blades. Since the turbine is spinning, force acts through a distance, the energy is transferred from water flow to turbine.
There were 2 type of turbine which is Reaction Turbine and Impulse Turbine. Reaction turbine are acted on by the water, which changes pressure as it move through the turbine and give up its energy. They must be encased to contain the water pressure or they must be submerged in the water flow. Impulse turbine change the velocity of the water jet. The jet pushes on the turbine's curved blades which changes the direction of flow. The resulting change in momentum caused a force on the turbine blades.
For my project, I decided to use Reaction type of turbine which submerge in the water pipe. The type is Gorlov Helical Turbine.
Gorlov Helical Turbin
Gorlov Helical Turbine (GHT) is a turbine that designed by altering it to have helical shape. Term of "foil" is used to describe the shape of the blade cross-section at the given point, with no distinction for the type of fluid. By using this shape, the turbine generates a smoother torque curve, so there is much less vibration and noise. The GHT has been observed to have up to 35% of efficiency in energy capture.Below show the original shape of GHT :
For my project, I will change the GHT and make it into spherical-helical's shape turbine. Since my project was in the water pipe, so the turbine should be in spherical shape. This will make the turbine rotate much faster due to the shape. The rotation of turbine will generate voltage by cutting the magnetic flux at rotor and stator. Below shown the spherical-helical turbine that I will use :
As for the material of turbine blade, I still doing research on which material is suitable for being used without messing up the performance of turbine.
Gorlov Helical Turbine (GHT) is a turbine that designed by altering it to have helical shape. Term of "foil" is used to describe the shape of the blade cross-section at the given point, with no distinction for the type of fluid. By using this shape, the turbine generates a smoother torque curve, so there is much less vibration and noise. The GHT has been observed to have up to 35% of efficiency in energy capture.Below show the original shape of GHT :
As for the material of turbine blade, I still doing research on which material is suitable for being used without messing up the performance of turbine.
