Learn about the comparison between Francis and Kaplan turbines.
Comparison # Kaplan Turbine:
1. Kaplan turbine is a compact unit.
2. For a given head and output Kaplan turbine runs at a higher speed.
3. This is an axial flow turbine.
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4. This turbine has a small number of blades (generally 4).
5. Loss of energy due to friction of the blades is less due to the small number of blades.
6. This turbine has adjustable runner blades.
7. This turbine is suitable for low heads.
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8. This turbine utilizes large discharges at low heads.
9. This turbine has a specific speed in the range 260 to 860.
Comparison # Francis Turbine:
1. Francis turbine is not a compact unit.
2. For a given head and output, the Francis turbine runs at a lower speed.
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3. This is radial flow type and also a mixed flow type.
4. This has many blades (about 10 to 20).
5. Loss of energy due to friction of the blades is greater due to large number of blades.
6. The runner blades are not adjustable.
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7. This turbine is suitable for medium heads.
8. This turbine utilizes medium discharge at medium head.
9. This turbine has a specific speed in the range 50 to 260.