What is meant by impulse 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.
What is a impulse turbine?
The impulse turbine is the simplest type of turbine. It consists of a row of nozzles followed by a row of blades. The gas is expanded in the nozzle, converting the high thermal energy into kinetic energy.
Which turbine is better impulse or reaction?
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 one is not reaction turbine?
Pelton wheel
Which of the following is an example of reaction turbine?
Reaction Turbine: If at the inlet of the turbine, the water possesses kinetic energy as well as pressure energy, the turbine is known as a reaction turbine. Example: Francis and Kaplan turbine.
What is the use of reaction turbine?
Reaction and impulse turbines compared. A reaction turbine is a type of turbine that develops torque by reacting to the pressure or weight of a fluid. The operation of reaction turbines is described by Newton’s third law of motion (action and reaction are equal and opposite).
Is used to drive reaction turbine?
In a reaction turbine, forces driving the rotor are achieved by the reaction of an accelerating water flow in the runner while the pressure drops.
What are the two main types of turbine?
There are two main types of hydro turbines: impulse and reaction. The type of hydropower turbine selected for a project is based on the height of standing water—referred to as “head”—and the flow, or volume of water, at the site. Other deciding factors include how deep the turbine must be set, efficiency, and cost.
What type of turbine is used for high head?
Hydropower Turbines
| Hydropower Turbine Type | Typical Site Characteristics |
|---|---|
| Kaplan turbine | Low to medium heads (1.5 – 20 metres) Medium to high flows (3 m3/s – 30 m3/s) For higher flows multiple turbines can be used. |
| Pelton/Turgo turbine | High heads (greater than 25 metres) Lower flows (0.01 m3/s – 0.5 m3/s) |
Which turbine is efficient?
Impulse turbines are most efficient for use in cases where the flow is low and the inlet pressure is high. Reaction turbines develop torque by reacting to the gas or fluid’s pressure or mass.