Question

Differentiate between
i) Impulse and Reaction turbine
ii) Radial and Axial flow Turbines
iii) Inward and Outward Radial flow turbines

Answer 1

Answer:

1.Tangential flow turbines: In this type of turbine the water strikes the runner in the direction of tangent to the wheel. Example:Pelton wheel t2.urbine

Radial flow turbines: In this type of turbine the water strikes in the radial direction. accordingly, it is further classified as,

a)Inward flow turbine: The flow is inward from periphery to the centre (centripetal type). Example: old Francis turbine.

b)Outward flow turbine: The flow is outward from the centre to periphery (centrifugal type). Example: Fourneyron turbine.

3.Axial flow turbine: The flow of water is in the direction parallel to the axis of the shaft. Example: Kaplan turbine and propeller turbine.

4.Mixed flow turbine: The water enters the runner in the radial direction and leaves in axial direction. Example:Modern Francis turbine

Answer 2

Answer:

i) The basic difference between impulse and reaction turbine is that in impulse turbine steam flows through the nozzle and impinges in moving blades, while in reaction turbine Steam flows initially from guide mechanism and then from moving blades.

ii)Whereas for an axial turbine the rotor is 'impacted' by the fluid flow, for a radial turbine, the flow is smoothly orientated perpendicular to the rotation axis, and it drives the turbine in the same way water drives a watermill.

iii)If water flows through the runner from outwards to inwards, such turbines will be termed as inward radial flow turbines. ... Turbine runner will have moving vanes and water will flow over the moving vanes in the outward radial direction and water will be discharged at the outer diameter of the runner

Explanation:

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