The primary advantage of a Kaplan turbine over a bulb turbine in a tidal barrage system with highly variable head is its ability to maintain high efficiency over a wider range of head conditions due to its adjustable runner blades. Head refers to the difference in water level between the upstream and downstream sides of the turbine, which drives the turbine's rotation. Tidal barrages experience highly variable head conditions as the tide rises and falls. Kaplan turbines are axial-flow reaction turbines with adjustable runner blades. The blade angle can be adjusted to optimize th....
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