What are the features of Kaplan turbine?

The Kaplan turbine is a propeller-type water turbine which has adjustable blades. It was developed in 1913 by Austrian professor Viktor Kaplan, who combined automatically adjusted propeller blades with automatically adjusted wicket gates to achieve efficiency over a wide range of flow and water level.

What kind of turbine is Kaplan turbine?

propeller hydro turbine
A Kaplan turbine is a type of propeller hydro turbine (specifically a reaction turbine) used in hydroelectric plants. Water flows both in and out of Kaplan turbines along its rotational axis (axial flow).

Why is Kaplan turbine high efficiency?

This adjustability of both inlet guide-vanes and rotor blades means that the flow operating range is very wide (a characteristic from the inlet guide-vanes) and the turbine efficiency is high and the efficiency curve very flat (a characteristic from the adjustable rotor blades allowing optimum alignment of the blade to …

What are the characteristic curves of a hydraulic turbine?

The hydraulic turbine characteristic curve is used to express the energy conversion, cavitation and other aspects of the hydraulic performance, force properties and other properties at the different operating conditions, these properties is the external characteristic of the internal flow of turbine, known as the …

What is the difference between Kaplan and Francis turbine?

Efficiency of Kaplan turbine is higher than Francis turbine. Kaplan turbine is more compact in cross-section and has lower rotational speed to that of Francis turbine. In Kaplan turbine, the water flows axially in and axially out while in Francis turbine it is radially in and axially out.

How do you obtain the characteristic curves of a turbine?

Curves are drawn by conducting experiment at constant head. Head and gate openings are kept constant and speed is varied by varying load on the turbine. For each value of speed, corresponding values of power and discharge are obtained. Tests are performed at constant speed.

Which principle is used in hydraulic turbines?

Newton’s second law of motion
The principle of a hydraulic turbine is based on Newton’s second law of motion. It states that the force is directly proportional to the change in momentum. If there is any change in the momentum of the water, then a force is generated as a result.

What is the major advantages of Kaplan turbine over other turbines?

Kaplan turbines are widely used throughout the world for electrical power production. It can work more efficiently at low water head and high flow rates as compared with other types of turbines. It is smaller in size and easy to construct.

Which is better impulse or reaction turbine?

The main differences between Impulse and Reaction turbines are, all hydraulic energy is converted into kinetic energy by a nozzle in the Impulse turbine and whereas In Reaction turbine Only some amount of the available energy is converted into kinetic energy.

What is the working principle of a Kaplan turbine?

Working Principle of the Kaplan Turbine: Kaplan turbine is an axial flow reaction turbine. So the working fluid changes the pressure as it moves across the turbine and gives energy. Power recapitulates from both the Hydrostatic head and kinetic energy of the following water.

Are there different types of Kaplan wind turbines?

There are variants of Kaplan turbines that only have adjustable inlet guide-vanes or adjustable rotor blades, which are known as semi-Kaplan’s. Although the performance of semi-Kaplan’s is compromised when operating across a wide flow range, for applications where the flow does not vary much they can be a more cost-effective choice.

Why is the nose cone on a Kaplan turbine important?

The nose cone on a Kaplan turbine is important hydro-dynamically to reduce losses and prevent the formation of a core ‘rope vortex’, and also provides the space for the complex blade pitching mechanism inside.

How does a moody Spreading Draft turbine work?

Moody Spreading Draft Tube. Kaplan turbine is an axial flow reaction turbine. So the working fluid changes the pressure as it moves across the turbine and gives energy. Power recapitulates from both the Hydrostatic head and kinetic energy of the following water.