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.
How is Kaplan turbine efficiency calculated?
Explanation: The overall efficiency of a Kaplan turbine is given by ηo = shaft power/ ρQgH. Substituting the given values in this equation, we get overall efficiency = 57.66 %. 13. The hydraulic efficiency of a Kaplan turbine is 95%, the mechanical efficiency is 93% and the volumetric efficiency is assumed to be 100%.
What is governing of Kaplan turbine?
Governing of Kaplan turbine Generally, double regulators are provided in a Kaplan turbine. The governor regulates the guide blade opening as well as the runner vane angles simultaneously. The adjustment of guide vanes is similar to that of a Francis turbine. The runner vanes are regulated by a separate Servomotor.
What is maximum head of Kaplan turbine?
The Kaplan turbine was an evolution of the Francis turbine. Its invention allowed efficient power production in low-head applications which was not possible with Francis turbines. The head ranges from 10 to 70 metres (33 to 230 ft) and the output ranges from 5 to 200 MW.
How does governing of Kaplan turbine differ from that of 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.
What is difference between Kaplan turbine and propeller turbine?
The difference between the Propeller and Kaplan turbines is that the Propeller turbine has fixed runner blades while the Kaplan turbine has adjustable runner blades. It is a pure axial flow turbine uses basic aerofoil theory.
What is the difference between Pelton turbine and Kaplan turbine?
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.
What is cavitation in turbine?
Cavitation is a common flow phenomenon observed in hydraulic turbines that can cause significant implications in the life cycle of the machine. Associated noise, vibration, and material erosion can degrade the performance of the turbine and hinder its reliable operation.
What type of flow is used in Kaplan turbine?
A Kaplan turbine is basically a propeller with adjustable blades inside a tube. It is an axial-flow turbine, which means that the flow direction does not change as it crosses the rotor.