A Pelton wheel has a diameter of 2 m and develops 500 kW when rotating 180 rpm. What is the average force of the water against the blades? If the turbine is operating at maximum efficiency, determine the speed of the water jet from the nozzle and the mass flowrate. Homework (answer: mass flow rate=707 kg/s and V₁ =37.6 m/s).

A Pelton wheel has a diameter of 2 m and develops 500 kW when rotating 180 rpm. What is the average force of the water against the blades? If the turbine is operating at maximum efficiency, determine the speed of the water jet from the nozzle and the mass flowrate. Homework (answer: mass flow rate=707 kg/s and V₁ =37.6 m/s).

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

A turbine develops 144 HP running at 100 rpm under a head of 7.7 meters. (a)At what speed, in RPM, should the turbine run under a head of 11 meters? (b)What horsepower would be developed?
A turbine is rated 620 hp when the flow of water through it is 22 ft3/s. Assuming an efficiency of 85 percent what head is acting on the turbine?
3.4 Find the flow rate of water through the system shown for the turbine to produce 20 kW. Neglect friction in your calculations
An irrigation pump delivers water through a 6 - inches horizontal pipe flowing full at the outlet, the jet striking the ground at a horizontal distance of 12 ft and a vertical distance of 4 ft from the end of the pipe. Find the capacity of the pump in gallons per minute.
A turbine develops 144 HP running at 100 rpm under a head of 7.7 meters. After resolving the turbine speed, what horsepower would be developed under a head of 11 meters?
If the velocity of water is 8m/s and the pressure is 140 kPa on the discharge side of a pump, What will be the head of the pump if the velocity is 4 m/s and the pressure is 90 kPa on the suction side of the pump? How much power is required to drive it if the diameter of suction side is 600 mm? If the pump is rated at 120 hp, what is the efficiency of the pump neglecting energy losses in the system?
A pump draws water from open reservoir A at 20 ft above pump centerline and lifts to an open reservoir B at 280 ft above pump centerline. The loss of head at the suction is 3 times the velocity head at the 6 inches suction pipe and at the discharge is 20 times the velocity head at the 4 inches discharge pipe. The pump discharge is 200 GPM. a. The total dynamic head in ft. b. The water power in horsepower
Water at 60 F from a lake through 500 ft if 4in ID cast iron pipe at a water turbine 250 ft below the surface of the lake. After flowing from the turbine, the water is discharged into the atmosphere through a horizontal 50 ft section of the same pipe. The turbine power output is 10hp when the water in the discharged pipe is flowing at 5 ft/s. What is the turbine efficiency defined as the actual power output of the turbine divided by the power output that would be withdrawn if there are no friction within the turbine. If the turbine were by passed, what would be the flow rate of water through the 500 ft of 4in pipe. a. Draw the diagram. b. Solve the problem. Provide complete solution. Ans. Ws/w%= 87.0095%
Water enters a rotating lawn sprinkler at a steady rate of 16 gal/min. The exit cross-sectional area of each of the two nozzles is 0.04 in2 and the flow leaving is tangential. The radius from the axis of rotation to the centerline of each nozzle is 8 in. (a) determine the resisting torque required to hold the sprinkler head stationary (b) determine the resisting torque associated with a sprinkler rotating at a constant 500 rpm (c) determine the angular velocity of the sprinkler if there is no resisting torque (ans: (a) 2.96 ftlb (b) 1.35 ftlb (c) 920 RPM
Include appropriate diagram and sketch. Air flows steadily at low speed through a horizontal nozzle (by definition a device for accelerating a flow), discharging to atmosphere. The area at the nozzle inlet is 0.1m². At the nozzle exit, the area is 0.02m². Determine the gage pressure required at the nozzle inlet to produce an outlet speed of 50 m/s.
An office room has a dimensions of 3x4x3 meters. It is desired to ventilate theentire air in 20 minutes. The opening from where the air will escape has dimensionsof 2x2 meters. Find the required velocity of the ventilated air for this purposes?
Water enters the impeller of a centrifugal pump radially at a rate of 45 cfm (cubic feet per minute) when the shaft is rotating at 500 rpm. The tangential component of absolute velocity of water at the exit of the 2-ft outer diameter impeller is 110 ft/s. Determine the torque applied to the impeller and the minimum power input to the pump