What is Francis turbine runner design process?
The meridional shape of the runner was designed focusing mainly on the combination of the guide vane loss analysis and experience. The runner blade inlet and outlet angles were designed by calculation of Euler’s head, while the port area of blade was modified by keeping constant angles of the blade at inlet and outlet.
What are Francis turbines made of?
Francis Turbine is a combination of both impulse and reaction turbine, where the blades rotate using both reaction and impulse force of water flowing through them producing electricity more efficiently.
What is the order of blades in Francis turbine?
The Working Mechanism of a Francis Turbine The turbine consists of an outer spiral casing, followed by a set of fixed blades called stay vanes. Next comes a collection of moving blades called guide vanes, then a bunch of centrally placed blades called runner and lastly, an outgoing duct called a duct draft tube.
What is the useful life of a Francis turbine?
The current average age of the hydro power turbines in the Norwegian power system is in the order of 40 years. This leads the power plant owners to search for the optimal time to refurbish, in order to avoid retiring turbines prematurely, while ensuring no catastrophic failures linked to turbine end of life.
What are the 5 main components of a Francis turbine?
A Francis Turbine consists of the 5 main parts those are:
- Spiral Casing.
- Stay Vanes.
- Guide Vanes.
- Runner Blades.
- Draft Tube.
What are the main features of Francis turbine?
One of the key characteristics of the Francis turbine is the fact that water changes direction as it passes through the turbine. The flow enters the turbine in a radial direction, flowing towards its axis, but after striking and interacting with the turbine blades it exits along the direction of that axis.
Is Francis turbine axial flow?
The Francis turbine is a type of water turbine. It is an inward-flow reaction turbine that combines radial and axial flow concepts. Francis turbines are the most common water turbine in use today, and can achieve over 95% efficiency.
What are the main features in Francis turbine?
What are basic designs of wind turbines?
Wind turbine design generally comprise of a rotor, a direct current (DC) generator or an alternating current (AC) alternator which is mounted on a tower high above the ground.
What is the gjre-a classification for Francis turbines?
A discussion on stress analyses and fatigue problems of pressure loaded parts and high frequency fatigue in runners, will be presented GJRE-A Classification : FOR Code: 290501 Design, Performance and Maintenance ofFrancis Turbines Strictly as per the compliance and regulations of Design, Performance and Maintenance of Francis Turbines
How many guide vanes does a Francis turbine have?
b) Design and hydraulic dynamic load on Francis runners The first fully welded high head runners in operation in Norway was the runners for the two 35.7 MW turbines operating at 510 m net head Hemsil I Power plant. These turbines had 28 guide vanes and 30 runner blades (15 full length blades and 15 splitter blades.
What are the defects of Francis turbine?
Design, Performance and Maintenance of Francis Turbines It should also be noted that weld defects in the stay vanes does not give any leakage before rupture and it will always be weld defects in the very thick plates of a stay ring. Then inspection by ultrasonic examination should be made for possible growing crack in the stay ring.
How many blades does a high head Francis turbine have?
The runners had 15 full length blades and 15 splitter blades (The outlet edge of the splitter blades is shown by dotted lines). BOTTOM: Cross section of a casted heavy Francis turbine (left) and a modern high head turbine with welded runner and spiral casing (right) ii. The performance of high head Francis turbines