he head at the base of the nozzle of a Pelton wheel is 640 m. The outlet vane angle of the bucket is 15. The relative velocity at the outlet is reduced by 15% due to friction along the vanes. If the discharge at outlet is without whirl find the ratio of bucket speed to the jet speed. If the jet diameter is 100 mm while the wheel diameter is 1.2 m, find the speed of the turbine in rpm, the force exerted by the jet on the wheel, the Power developed and the hydraulic efficiency. Take Cv=0.97.
he head at the base of the nozzle of a Pelton wheel is 640 m. The outlet vane angle of the bucket is 15. The relative velocity at the outlet is reduced by 15% due to friction along the vanes. If the discharge at outlet is without whirl find the ratio of bucket speed to the jet speed. If the jet diameter is 100 mm while the wheel diameter is 1.2 m, find the speed of the turbine in rpm, the force exerted by the jet on the wheel, the Power developed and the hydraulic efficiency. Take Cv=0.97.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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he head at the base of the nozzle of a Pelton wheel is 640 m. The outlet vane angle of the bucket is
15. The relative velocity at the outlet is reduced by 15% due to friction along the vanes. If the discharge at
outlet is without whirl find the ratio of bucket speed to the jet speed. If the jet diameter is 100 mm while
the wheel diameter is 1.2 m, find the speed of the turbine in rpm, the force exerted by the jet on the wheel,
the Power developed and the hydraulic efficiency. Take Cv=0.97.
Transcribed Image Text:Q 2: A jet of water having a velocity of 30 m/s strikes a curved vane, which is moving with a velocity of
15 m/s. The jet makes an angle of 30° with the direction of motion of vane at inlet and leaves at an angle
of 120° to the direction of motion of vane at outlet. Calculate: (i) vane angles, if the water enters and
leaves the vane without shock, (ii) work done per second per unit weight of water striking the vane per
second.
(i) 53.8°, 15.7° (ii) 44.15NM/N)
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