Question
Download Solution PDFThe speed ratio of a Francis turbine varies from:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Speed ratio:
- It is defined as the ratio of tangential velocity or circumferential velocity to its spout velocity and denoted b.
- ϕ =
Where, U1 = Tangential velocity, = Spout velocity - Speed ratio varies from ie 0.6 ≤ ϕ ≤ 0.9
Flow ratio:
- It is defined as the ratio of flow velocity at the inlet to the spout velocity.
- ψ =
Where, Vf1 = Flow velocity at inlet and = Spout velocity. - Flow value varies from ie 0.15 ≤ ψ ≤ 0.3
Additional Information
| Turbine Name | Specific Speed (NS), MKS |
| Pelton wheel turbine (Single jet) |
10 - 35 |
| Pelton wheel turbine (Multiple jets) |
35 - 60 |
| Francis turbine | 60 - 300 |
| Kaplan turbine | > 300 |
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