basic mechanical engineering-hydraulic turbines

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Basic Mechanical Engineering- Hydraulic Turbines By Mr.B.Ramesh, M.E.,(Ph.D) Research Scholar, CEG, Anna University, Chennai. Associate Professor, Department of Mechanical Engineering, St. Joseph’s College of Engineering, Jeppiaar Trust, Chennai-119 June 9, 2022 1

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Basic Mechanical Engineering-Hydraulic Turbines. By Mr.B.Ramesh, M.E.,(Ph.D) Research Scholar, CEG, Anna University, Chennai. Associate Professor, Department of Mechanical Engineering, St. Joseph’s College of Engineering, Jeppiaar Trust, Chennai-119. Hydraulic (Water) Turbines. - PowerPoint PPT Presentation

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Page 1: Basic Mechanical Engineering-Hydraulic Turbines

Basic Mechanical Engineering-Hydraulic Turbines

By

Mr.B.Ramesh, M.E.,(Ph.D)

Research Scholar, CEG, Anna University, Chennai.Associate Professor, Department of Mechanical Engineering,

St. Joseph’s College of Engineering,Jeppiaar Trust, Chennai-119

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Page 2: Basic Mechanical Engineering-Hydraulic Turbines

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

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Page 3: Basic Mechanical Engineering-Hydraulic Turbines

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.

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Page 4: Basic Mechanical Engineering-Hydraulic Turbines

Pelton Wheel (Pelton turbine)… The flow of water is tangential to

the runner. So it is a tangential flow impulse turbine.

A Pelton’s 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.

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This movement controls the flow of water leaving the nozzle, before it strikes the bucket(vane)

Page 5: Basic Mechanical Engineering-Hydraulic Turbines

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.

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Page 6: Basic Mechanical Engineering-Hydraulic Turbines

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Pelton Wheel (Pelton turbine)…

Page 7: Basic Mechanical Engineering-Hydraulic Turbines

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Pelton Wheel (Pelton turbine)…

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Pelton Wheel (Pelton turbine)…

Page 9: Basic Mechanical Engineering-Hydraulic Turbines

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Pelton Wheel (Pelton turbine)…

Page 10: Basic Mechanical Engineering-Hydraulic Turbines

Kaplan turbine (Propeller turbine) Kaplan turbine is a type of propeller turbine which was developed during

1900’s 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.

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Page 11: Basic Mechanical Engineering-Hydraulic Turbines

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.

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Page 12: Basic Mechanical Engineering-Hydraulic Turbines

Kaplan turbine (Propeller turbine)…

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Page 13: Basic Mechanical Engineering-Hydraulic Turbines

Kaplan turbine (Propeller turbine)…

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Page 14: Basic Mechanical Engineering-Hydraulic Turbines

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.

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Page 15: Basic Mechanical Engineering-Hydraulic Turbines

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.

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Page 16: Basic Mechanical Engineering-Hydraulic Turbines

Hydraulic turbines…

Difference between Kaplan turbine and Francis turbine:

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Sl.No. Kaplan turbine Francis turbine1 Water enters the runner vanes

axially and leaves axially, hence it is called axial flow turbine.

Water enters the runner vanes radially and leaves axially, hence it is called a mixed flow turbine.

2 The number of blades in the runner is generally between 3 and 8.

The number of blades in the runner is generally between 16 and 24.

Page 17: Basic Mechanical Engineering-Hydraulic Turbines

Hydraulic turbines…

Difference between Impulse and Reaction hydraulic turbines:

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Sl.No. Impulse turbinee.g. Pelton turbine

Reaction turbinee.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.

Page 18: Basic Mechanical Engineering-Hydraulic Turbines

Videos and Animations

1. Pelton Francis Kaplan turbine animation

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Thank You

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