What is meant by impulse turbine and reaction turbine?
As mentioned above, while an impulse turbine is capturing energy at only the single point where the water jet is hitting it, a reaction turbine is capturing energy across the whole wheel at once—which is why a reaction turbine in a hydroelectric plant can produce more power than an impulse turbine of the same size.
Why reaction turbine is better than impulse turbine?
9 Impulse turbine have more hydraulic efficiency. Reaction turbine have relatively less efficiency. 10 Impulse turbine operates at high water heads. Reaction turbine operate at low and medium heads.
Which is more efficient impulse or reaction turbine?
Reaction turbines are more efficient as compared to the impulse turbines. The reaction turbine has more blades compared to the impulse turbine. The rotor blades turn around as the steam moves past them. In a reaction turbine, the direction of the steam remains the same.
Which turbine has lowest speed?
3.1. Commercial Small Turbines
| Turbine Diameter | m | 5.5 |
|---|---|---|
| Rated Wind Speed | m/s | 10 |
| Rated Power | W | 5000 |
| Rated Turbine Speed | rpm | 200 |
| Predicted Power at 3 m/s | W | 135 |
How do you calculate turbine speed?
Specific speed of a turbine calculator uses specific_speed_turbine = (Speed*sqrt(Power))/(Head^(5/4)) to calculate the Specific speed of a turbine, The Specific speed of a turbine formula is defined as the ratio of product of speed and square root of power to the head raised to the power of 5/4.
What is the speed of turbine?
The specific speed value for a turbine is the speed of a geometrically similar turbine which would produce unit power (one kilowatt) under unit head (one meter). The specific speed of a turbine is given by the manufacturer (along with other ratings) and will always refer to the point of maximum efficiency.
What is overall turbine efficiency?
Explanation: Overall efficiency is defined as ratio of power available at shaft of turbine to power supplied at the inlet of turbine which is also product of mechanical and hydraulic efficiency. Its expression is given by p/(k*g*q*h) where k is density of liquid.
How turbines are classified based on head?
Explanation: Based on heads and discharges, turbines are classified into Pelton, Francis or Kaplan. Pelton has high head and low discharge. Explanation: Based on heads and discharges, turbines are classified into Pelton, Francis or Kaplan. Kaplan has low head and high discharge.
How do I choose a hydropower turbine?
- Head. The hydraulic turbine selected should be decided based on the head, and for different head ranges different turbines are suitable.
- Specific speed.
- Rotational speed.
- Efficiency of turbine.
- Cavitation.
- Disposition of turbine shaft.
- Part-load operation.