How the governing operation of Francis and Kaplan turbines are different?
General differences between Francis and Kaplan turbines 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.
What are the main components of Kaplan turbine explain with a neat sketch?
The Kaplan turbine is an inward flow reaction turbine, which means that the working fluid changes pressure as it moves through the turbine and gives up its energy. Power is recovered from both the hydrostatic head and from the kinetic energy of the flowing water.
What are the main components of Kaplan turbine?
The main parts of the Kaplan turbine are four:
- Scroll Casing.
- Guide Vane Mechanism.
- Draft Tube.
- Runner Blades.
Which governing mechanism is used in case of Pelton wheel turbine?
Oil pressure governor is used for governing of Pelton turbine.
What is Pelton and Kaplan turbine and differentiate between them?
Pelton wheel is an impulse turbine where static pressure head of water is converted into mechanical energy. On the other hand, Francis and Kaplan’s turbines are reaction turbines where dynamic pressure head of water is converted into mechanical energy.
Why are Francis and Kaplan turbine called reaction turbine?
The basic difference between Pelton, Francis and Kaplan Turbines is explained in this article. Francis Turbine is an inward flow reaction turbine. Kaplan turbine is a propeller type reaction turbine. The operating water head of a Francis turbine ranges from 40 to 600m.
What is the unique feature of Kaplan turbine?
The Kaplan turbines work at the high flow rate of water and low head with maximum efficiency that is not possible in Francis turbine. A unique feature of Kaplan turbines is that their blades change their position as needed to maintain the highest efficiency under different water flow conditions.
Where is Kaplan turbine used?
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).
What is Hub in Kaplan turbine?
Kaplan Turbine is an axial reaction flow turbine and has adjustable blades. When the water flows parallel to the axis of the rotation of the shaft, the turbine is known as the axial flow turbine. The lower end of the shaft is made larger which is known as a hub or boss.
How is the governing of speed done on a Pelton wheel?
Working of Governing Of Impulse turbine ( Pelton Wheel ): The centrifugal governor which is connected to the turbine main shaft will be rotating at an increased speed and hence centrifugal force on the fly ball increases and it moves upward. The sleeve of the governor will also move upward.
What is the type of flow in Kaplan turbine Mcq?
Explanation: In Kaplan turbine water strikes the turbine blades axially. That’s why Kaplan turbine is an axial flow turbine. Kaplan turbines are special type of turbines for low head applications.
How does governing of a Pelton turbine differ from Francis turbine?
The operating water head of a Francis turbine ranges from 40 to 600m. The flow of water through the blades combines both radial and axial flow. The flow of water is axial through the blades. The required discharge for the working of a Pelton turbine is low.
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.
What type of blades are used in Kaplan turbine?
The turbine accommodates several rotor blades which are directly connected to the central shaft of the turbine. In Kaplan, mostly two types of blade used – Guide vane are installed with spiral casing to make the flow of water in the runner.
What is axial flow in Kaplan turbine?
Waterflow both in and out of Kaplan turbines through its rotational axis, which is called axial flow. The point that makes Kaplan turbines special is that the blades can change their demand to preserve maximum efficiency for various water flow rates. Kaplan turbine, similar to Francis turbine, is a reaction turbine.
Where is the upthrust force in Kaplan turbine?
It is located between the high-pressure water source and the low-pressure water exit. In Kaplan turbine work output is occurs from turbine blades as water flows through the blades, an upward force is generated in the opposite direction of water movement. This upthrust force help in the rotation of blades.