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A Kaplan turbine is used for ________.
low heads and large quantities of water
low heads and low quantities of water
high heads and low quantities of water
high heads and large quantities of water
low heads and large quantities of water
A Kaplan turbine is an axial-flow reaction turbine specifically designed to operate efficiently under low heads and high discharge conditions. It utilizes adjustable runner blades that allow the turbine to maintain high efficiency across a wide range of flow rates.
IS 12837:1989
A Kaplan turbine is an axial-flow reaction turbine specifically designed to operate efficiently under low heads and high discharge conditions. It utilizes adjustable runner blades that allow the turbine to maintain high efficiency across a wide range of flow rates.
NsтАЛ=H5/4NPтАЛтАЛ тАФ represents the specific speed of the turbine
Q=AvтАЛ├ЧVfтАЛ тАФ represents the discharge rate through the runner where AvтАЛ is the flow area and VfтАЛ is the flow velocity
The turbine operates on the reaction principle where water flows axially through the runner. The adjustable pitch of the blades, governed by a governor mechanism synchronized with the wicket gates, ensures that the blade angle is optimized for varying discharge rates, thereby maximizing the hydraulic efficiency at part-load conditions.
Kaplan turbine is a propeller-type turbine with adjustable blades.
It is categorized under high specific speed turbines (300тИТ1000 rpm).
Suitable for heads typically ranging from 2 meters to 70 meters.
Excellent part-load efficiency due to double regulation (adjustable wicket gates and runner blades).
High efficiency at part-load conditions
Compact size for low head installations
Can handle large variations in water discharge
Complex mechanical design due to adjustable blades
Higher initial maintenance cost compared to fixed-blade propeller turbines
Susceptible to cavitation if head limits are exceeded
Run-of-the-river hydroelectric power plants
Tidal power plants
Low-head irrigation dam projects
The specific speed for a Kaplan turbine is generally between 300 and 1000 depending on the units used.
Option B is incorrect because Kaplan turbines are designed for large quantities of water (large discharge).
Option C and D are incorrect as high head applications are served by Impulse turbines (like Pelton) or Francis turbines.
A is correct тАФ The Kaplan turbine is specifically engineered for low-head sites requiring a massive volumetric flow rate of water to generate significant power.
Remember the specific speed range: Pelton (8тИТ30), Francis (60тИТ300), and Kaplan (300тИТ1000). Higher specific speed always implies lower head requirements.
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