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Kaplan turbine runner blade count (typical range) State the usual number of adjustable runner blades used in a Kaplan (axial-flow) turbine. Choose the correct range.

Difficulty: Easy

2 to 4
4 to 8
8 to 16
16 to 24

Correct Answer: 4 to 8

Explanation:

Concept/Approach

Kaplan turbines use a small number of adjustable blades to suit varying heads and flows.

Typical design
Most Kaplan runners use about 4 to 8 blades, balancing efficiency, cavitation resistance, and structural aspects.

Final Answer
4 to 8

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