Question
Download Solution PDFThe range of specific speed of a Kaplan or Propeller turbine in SI units, is:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Specific speed:
- It is defined as the speed of a similar turbine working under a head of 1 m to produce a power output of 1 kW. The specific speed is useful to compare the performance of the various type of turbines. The specific speed differs for the different type of turbines and is the same for the model and actual turbine.
Following are the range of specific speed of different turbines
- The specific speed of Pelton wheel turbine (single jet) is in the range of 10-35
- The specific speed of Pelton wheel turbine (multiple jets) is in the range of 35-60
- The specific speed of Francis turbine is in the range of 60-300.
- The specific speed of Kaplan/propeller turbine is greater than 300.
So the Kaplan turbine has the highest specific speed.
The classification of the turbine based on the basis of operating head
|
Type of turbine |
Operating head (m) |
|
Pelton |
300 m and above |
|
Francis |
60 m to 300 m |
|
Kaplan |
20 m to 60 m |
|
Bulb |
2 m to 20 m |
The specific speed of a turbine is in the range of
|
Turbine |
Ns |
|
Pelton wheel |
10 - 60 |
|
Francis |
60 - 300 |
|
Kaplan |
> 300 |
Last updated on May 28, 2025
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