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The velocity of steam at inlet to a simple impulse turbine is 1200 m/s and the...

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Mechanical Engineering

The velocity of steam at inlet to asimple impulse turbine is 1200 m/s and the nozzle angle is 21°. Theblade speed is 500 m/s and the blades are symmetrical.Evaluate:

  1. The blade angles if the steam is to enter the blades withoutshock. If the friction effects on the blade are negligible,specify the tangential force on the blades and thediagram power for a mass flow of 0.85 kg/s. What are the axialthrust and the diagram efficiency?
  2. If the relative velocity at exit is reduced by friction to 77 %of that at inlet, what are then the diagram power and the axialthrust? Evaluate also the diagram efficiency inthis case.

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