Table of Contents
Introduction To Hydraulic Turbine and Classification Of hydraulic turbine
HYDRAULIC TURBINES —DEFINITION
Introduction to Hydraulic (Water) Turbine -Working Of Impulse and Reaction Turbine
Classification of Hydraulic turbines:
1) Based on type of energy at inlet to the turbine:
- Impulse Turbine : The energy is in the form of kinetic form. e.g: Pelton wheel, Turbo wheel.
- Reaction Turbine : The energy is in both Kinetic and Pressure form. e.g: Tubular, Bulb, Propellar, Francis turbine.
2) Based on direction of flow of water through the runner:
- Tangential flow: water flows in a direction tangential to path of rotational, i.e. Perpendicular to both axial and radial directions.
- Radial outward flow e.g : Forneyron turbine.
- Axial flow : Water flows parallel to the axis of the turbine. e.g: Girard, Jonval, Kalpan turbine.
- Mixed flow : Water enters radially at outer periphery and leaves axially. e.g : Modern Francis turbine.
3) Based on the head under which turbine works:
- High head, impulse turbine. e.g : Pelton turbine.
- Medium head,reaction turbine. e.g : Francis turbine.
- Low head, reaction turbine. e.g : Kaplan turbine, propeller turbine.
4) Based on the specific speed of the turbine:
- Low specific speed, impulse turbine. e.g : Pelton wheel.
- Medium specific speed, reaction turbine. e.g : Francis wheel.
- High specific speed, reaction turbine. e.g : Kaplan and Propeller turbine.
5) Based on the name of the originator:
- Impulse turbine – Pelton wheel, Girard, Banki turbine.
- Reaction turbine – Forneyron, Jonval, Francis, Dubs, Deriaze, Thomson kalpan, Barker, Moody, Nagler, Bell.
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