The velocity of steam at inlet to a simple impulse turbine is 1200 m/s and the nozzle angle is 21°. The blade speed is 500 m/s and the blades are symmetrical. Evaluate:
The velocity of steam at inlet to a simple impulse turbine is 1200 m/s and the nozzle angle is 21°. The blade speed is 500 m/s and the blades are symmetrical. Evaluate:
- The blade angles if the steam is to enter the blades without shock. If the friction effects on the blade are negligible, specify the tangential force on the blades and the diagram power for a mass flow of 0.85 kg/s. What are the axial thrust and the diagram efficiency?
- If the relative velocity at exit is reduced by friction to 77 % of that at inlet, what are then the diagram power and the axial thrust? Evaluate also the diagram efficiency in this case.
