Question
Download Solution PDFWhich of the following is the correct relation for specific speed of turbine?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
The specific speed of a turbine is defined as, the speed of a geometrically similar Turbine that would develop unit power when working under a unit head (1m head).
Mathematically it is given by:
\({N_s} = \frac{{N\sqrt P }}{{{H^{\frac{5}{4}}}}}\)
Classification of turbines on the various basis is given in the table below:
|
Flow |
Energy |
Head |
Specific speed |
Example |
|
Tangential |
Impulse |
High (300 m and above) |
Low (0 – 60 RPM) |
Pelton Wheel turbine |
|
Radial |
Reaction |
Medium (30 m to 300 m) |
Medium (60 – 300) RPM |
Francis turbine |
|
Axial |
Reaction |
Low (less than 30 m) |
High |
|
|
(300 – 600) RPM |
Propeller turbine |
|||
|
(600 – 1000) RPM |
Kaplan turbine |
Last updated on May 28, 2025
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