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PELTON TURBINE  Pelton Turbine is a Tangential Flow Impulse Turbine.  The energy available at the inlet of the Pelton Turbine is only Kinetic Energy.

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Presentation on theme: "PELTON TURBINE  Pelton Turbine is a Tangential Flow Impulse Turbine.  The energy available at the inlet of the Pelton Turbine is only Kinetic Energy."— Presentation transcript:

1 PELTON TURBINE  Pelton Turbine is a Tangential Flow Impulse Turbine.  The energy available at the inlet of the Pelton Turbine is only Kinetic Energy  The Pressure Energy of water is converted into Kinetic Energy when passed through the nozzle and forms into a high velocity water jet.  This water jet is used for driving the Pelton Turbine or Pelton Wheel.

2  Water from the reservoir  Flows through the Penstock  To a nozzle at outlet  Nozzle increase the KE of the water  Water comes out in the form of jet  Strikes the buckets (vanes) of the runner  The runner will starts rotataing.

3  Pelton Turbine consists of a rotor (a circular disc), having equally spaced double hemispherical buckets (vanes) on its periphery.  The spear is a conical needle, moving inside the nozzle will controls the amount of water flow through the nozzle and thereby regulating the amount of water striking the runner.  The function of the casing is to prevent the splashing of the water and to discharge the water to the tail race. It is also acts as a safeguard against accidents.

4 FRANCIS TURBINE  In modern Francis turbine, water enters the runner of the turbine in the radial direction and leaves in the axial direction, so the Modern Francis turbine is a mixed flow reaction turbine.

5  Water from the casing  Enters the stationary guide wheel  Guide wheel consists of guide vanes  Which directs water to enter the runner (which consists of vanes)  Water flows over the vanes sets the runner to rotate.  Main parts are: 1.Casing 2.Guide mechanism 3.Runner 4.Draft Tube

6 CASING - Water from the penstock enters the casing which is of spiral shape. The area of cross section of the casing goes on decreasing gradually.  The casing completely surrounds the runner of the turbine.  The casing and runner are always full of water.  The casing is usually made of cast steel, plate steel, concrete etc.

7 GUIDE MECHANISM – It consist of a stationary circular wheel all around the runner of the turbine.  Stationary guide vanes are fixed on the guide mechanism.  The guide vanes allow the water to strike without shock on the vanes which are fixed on the runner.  By some suitable arrangement, the width between the two adjacent vanes of the guide mechanism can be altered thereby varying the amount of water striking the runner.

8 RUNNER– It is a circular wheel, having series of radial curved vanes.  The surface of the vanes are very smooth, and shaped in such a way that water enters and leaved the runner without shock.  The runner is keyed to the shaft.  The runner are made of cast steel, cast iron or stainless steel.

9 Draft Tube – the pressure of at the exit of the runner of a reaction turbine is generally less than atmospheric pressure.  The water is discharged to the tail race through a pipe or tube of gradually increasing area called the draft tube.  The free end of the draft tube is submerged into the tail race.  The draft tube partially convert discharge velocity into useful pressure head.

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11 KAPLAN TURBINE  If the vanes (3 to 8) fixed to the hub are adjustable, the turbine is known as Kaplan Turbine, named after Victor Kaplan, an Austrian Engineer.  Kaplan Turbine are used when large quantity of water at low head is available.

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13 MAIN PARTS OF KAPLAN TURBINE 1. Scroll Casing 2. Guide Vane Mechanism 3. Hub with Vanes or Runner of the Turbine 4. Draft Tube

14  The water from the penstock  Enters the scroll casing  Moves to the guide vanes  Water turns through 90º  Flows axially through the runner  Runner rotates  Water get discharged to the tailrace through the draft tube.


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