Basic Mechanical EngineeringHydraulic Turbines By Mr.B.Ramesh, M.E.,(Ph.D) Research Scholar, CEG, Anna University, Chennai. Associate Professor, Department of Mechanical Engineering, St. Josephs College of Engineering, Jeppiaar Trust, Chennai-119 February 27, 2020 1
Hydraulic (Water) Turbines Basic working principle: Hydraulic turbines convert the potential energy of water into mechanical work. Three most popular hydraulic turbines are : Pelton wheel (Pelton turbine) Kaplan turbine (Propeller turbine) Francis turbine February 27, 2020
2 Pelton Wheel (Pelton turbine) This turbine is named after Lester A. Pelton (1829 1908) an American Engineer who developed it in the year 1880. Pelton wheel is a high head turbine. It is used with heads of more than 500 metres. Note : A head is the distance the water falls before it strikes the turbine blades. February 27, 2020 3
Pelton Wheel (Pelton turbine) The flow of water is tangential to the runner. So it is a tangential flow impulse turbine. A Peltons runner consists of a single wheel mounted on a horizontal shaft. Water falls towards the turbine through a pipe called penstock and flows through a nozzle. The high speed jet of water hits the buckets (vanes) on the wheel and causes the wheel to rotate.
A spear rod which has a spear shaped end can be moved by a hand wheel. February 27, 2020 This movement controls the flow of water leaving the nozzle, before it strikes the bucket(vane) 4 Pelton Wheel (Pelton turbine)
The bucket or vane is so shaped that when the water strikes, it gets split into two and gives it an impulse force in the centre of the bucket. This bucket is also known as splitter. February 27, 2020 5 Pelton Wheel (Pelton turbine) February 27, 2020 6
Pelton Wheel (Pelton turbine) February 27, 2020 7 Pelton Wheel (Pelton turbine) February 27, 2020 8
Pelton Wheel (Pelton turbine) February 27, 2020 9 Kaplan turbine (Propeller turbine) Kaplan turbine is a type of propeller turbine which was developed during 1900s by the Austrian engineer Victor Kaplan (1876 1934) Kaplan turbine is a low head turbine and used for heads of less than 80 metres. The runner of a kaplan turbine resembles with propeller of a ship. That is why, a Kaplan turbine is also called as propeller turbine.
February 27, 2020 10 Kaplan turbine (Propeller turbine) The turbine wheel, which is completely under water, is turned by the pressure of water against its blades. Guide vanes regulate the amount of water reaching the wheel.
February 27, 2020 11 Kaplan turbine (Propeller turbine) February 27, 2020 12 Kaplan turbine (Propeller turbine) February 27, 2020
13 Francis turbine It is named after James B. Francis (1815 1892) an English born inventor who developed the turbine in the year 1849. It is used when the head is between 80 to 500 metres. i.e. it is a medium head turbine. It is a mixed flow reaction turbine. February 27, 2020 14
Francis turbine A Francis turbine rotates in a closed casing. Its wheel has many curved blades called runner vanes as many as 24. Its shaft is vertical. The wheel of a Francis turbine operates under water. The guide vanes and stay vanes control the amount of water flowing into the runner vanes.
The runner is rotated mainly due to the weight or pressure of the flowing water. February 27, 2020 15 Hydraulic turbines Difference between Kaplan turbine and Francis turbine: Sl.No. Kaplan turbine Francis turbine
1 Water enters the runner vanes Water enters the runner vanes axially and leaves axially, hence it radially and leaves axially, hence is called axial flow turbine. it is called a mixed flow turbine. 2 The number of blades in the The number of blades in the runner runner is generally between 3 and is generally between 16 and 24. 8.
February 27, 2020 16 Hydraulic turbines Difference between Impulse and Reaction hydraulic turbines: Sl.No. Impulse turbine Reaction turbine
e.g. Pelton turbine e.g. Kaplan & Francis turbines 1 In an impulse turbine all the available energy of water is converted into kinetic energy as it passes through a nozzle. In a reaction turbine, at the
entrance to the runner, only a part of the available energy of water is converted into kinetic energy and a greater part remains in the form of pressure energy. 2 The water flowing through the nozzle impinges on the buckets which are fixed on the outer periphery of the wheel.
The water is guided by the guide blades to flow over the runner vanes. February 27, 2020 17 Videos and Animations 1. Pelton Francis Kaplan turbine animation
February 27, 2020 18 Thank You February 27, 2020 19
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