Hydraulic Turbines

Transcript of Hydraulic Turbines

Introduction

Machines which convert hydraulic energy in tomechanical energy

Use the PE and KE of water and rotate the rotor bydynamic action of water
Classification
Classification
Unit Quantities
Unit Quantities
Unit Quantities
Unit Quantities
Pelton Wheel
Pelton Wheel
Pelton Wheel: Main Components
Pelton Wheel: Useful terminology
Pelton Wheel: Anlaysis
Pelton Wheel: Analysis

0.97 0.99

85 to 90%.85 to 90%.
Pelton Wheel: Efficiency Vs speed Efficiency Vs speed

ratioratio

Theoretically, the peak of occurs at u/V1=0.5

In actual practice it occurs at speed ratio little less than 0.5 at speed ratio little less than 0.5 at about 0.46

Since the speed ratio is fixed for maximum efficiency, lower the head lower will be the speed
Pelton Wheel: Efficiency Vs speed Efficiency Vs speed

ratioratio

Hence it will be difficult to couple the turbine directly to generator running at high speeds

Thus the pelton wheel is found Thus the pelton wheel is found unsuitable for lower heads.

From the figure, =0 when u/V1=1. This speed of the wheel is known as runaway speed, i.e. speed at no load or wheel is running away from the jet with same velocity as that of the jet
Pelton Wheel: Analysis through

Numerical example

Numerical example

Numerical example

Numerical example

Numerical example

Numerical example

Numerical example

Numerical example

Numerical example

Numerical example

Numerical example

Numerical example

Numerical example

Numerical example

Numerical example

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