A Pelton turbine is driven by two jets, generating 4.0 MW at 375 rev/min. The effective head at the nozzles is 200 m of water and the nozzle velocity coefficient, KN = 0.98. The axes of the jets are tangent to a circle 1.5 m in diameter. The relative velocity of the flow across the buckets is decreased by 15 percent and the water is deflected through an angle of 150° neglecting bearing and windage losses. What is the Jet speed ratio?

A Pelton turbine is driven by two jets, generating 4.0 MW at 375 rev/min. The effective head at the nozzles is 200 m of water and the nozzle velocity coefficient, KN = 0.98. The axes of the jets are tangent to a circle 1.5 m in diameter. The relative velocity of the flow across the buckets is decreased by 15 percent and the water is deflected through an angle of 150° neglecting bearing and windage losses. What is the Jet speed ratio?

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

A pelton uheel has a mean bucket speed of 10 m/sec with a jet of water flowing at the rate of 0.7 m3/sec under a head of 30 m. The bucket deflect the jet through an angle of 160°. Calculate power given by water to the runner and the hydraulic efficiency of the turbine. Assume efficiency of the nozzle as 0.98.
Water is at 20°C is pumped from a lower reservoir to a higher reservoir by a pump at a rate of 10 1/s. If both pipes are of galvanized iron. Determine the friction head loss (m)? 20m LA sM di= 10cm purp 5.75 1.135 0.654 2.187
he 30o directional pressure pipe elbow in the vertical plane is 60 cm in diameter. from the elbowThe flow rate of the current passing is 1 m3/s. At the lower end (1) of the elbow, the pressure is 70 kPa and the ground level is 30 m, the upperAt the end of the section (2), the ground level is 31 m. The fluid is water (ρwater=1000 kg/m3), frictionless and incompressible.taking into account thata) Find the velocities in sections (1) and (2) and the pressure in section (2).b) The weight of the pipe at the elbow is 1400 N. In case the length between sections is 1.2 mIn order to keep the elbow stable, taking into account the mass of water in the elbow, in the vertical directionCalculate the force that must be applied.
Water flows from a tank thru a 200mm and 125mm diameter circular orifice with a total drop in water surface of 12m. The coefficient discharge for each orifice is C = 0.65. Considering the flow uniform and neglecting velocity of approach, determine the height hi and h2 and the maximum discharge. H2 nes) 立

“Value” in the Value Engineering process is defined as _________ divided by ____________. Initial cost, duration + quality Initial cost, life-cycle cost Function + quality, life-cycle cost Duration, initial cost
A transmission tower is subjected to the wind loads shown. Determine the axial force (kN) in member GE. J 1.5 m K >7 kN 1.8 m H >3 kN 1.8 m D E >5 kN F 1.8 m В 2.55 m 2.55 m
At the power station, a Pelton wheel produces 1260kW under a head of 610m. The loss of headdue to pipe friction between the reservoir and nozzle is 46m. The buckets of the Pelton wheeldeflect the jet through an angle of 1658, while relative velocity of the water is reduced by 10%due to bucket friction. The bucket/jet speed ratio is 0.46. The bucket circle diameter of thewheel is 890mm and there are two jets. Find the theoretical hydraulic efficiency, speed ofrotation of the wheel, and diameter of the nozzle if the actual hydraulic efficiency is 0.9 timesthat calculated above. Assume nozzle velocity coefficient, Cv = 0.98. Show the schematic diagram of this problem.
A horizontal jet of 57 liters/sec strikes tangentially on one or another of a series of moving curved vanes, each having a deflection angle of 60 degrees. The water as it leaves the vane has an absolute velocity of 12 m/sec and makes an angle of 30 degrees with the horizontal. (a) Determine the horizontal force exerted on the vanes. (b) Determine the power developed.
4.(c) An inward flow reaction turbine has an inlet and outlet diameter of 1.5 m and 0.75 m respectively. The breadth at the inlet is 0.30 m and at the outlet is 0.40 m. At a speed of rotation of 300 rpm., the relative velocity at the entrance is 5.25 m/sec and is radial. Calculate the (i) absolute velocity at entrance and inclination to the tangent of the runner; (ii) discharge; (iii) velocity of flow at the outlet.
Water is flowing in the straight 100mm diameter coated cast iron as shown in the figure. Due to continous supply, the water level of the reservoir remains constant at all time. By using Darcy Weisbach and Hazen William’s formula of head loss, determine the flow rate in the pipe.