A Kaplan turbine delivering 4O MW works under a head of 35 m and runs at 167 rpm.The hub diameter is 2.5 m and runner tip diameter is 5 m. The overall efficiency is 87%.Determine the blade angles at the hub and tip and also at a diameter of 3.75 m. Also find the speed ratio and flow ratio based on tip velocity. Assume nH = 90%. %3D Inlet blade angle at the hub

A Kaplan turbine delivering 4O MW works under a head of 35 m and runs at 167 rpm.The hub diameter is 2.5 m and runner tip diameter is 5 m. The overall efficiency is 87%.Determine the blade angles at the hub and tip and also at a diameter of 3.75 m. Also find the speed ratio and flow ratio based on tip velocity. Assume nH = 90%. %3D Inlet blade angle at the hub

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 propeller turbine develops 12,000hp, and rotates at 145rpm under a head of 20m. The outer and hub diameters are 4m and 1.75m, respectively. Calculate the inlet and outlet blade angles measured at mean radius if overall and hydraulic efficiencies are 85% and 93%, respectively. Show schematic diagram and provide solutions.
A Kaplan turbine runner is to designed to develop 10000 hp, the net head is 5.5 m. Assume that the speed ratio is 2.09 and the flow ratio is 0.68, and the overall efficiency is 60%. The diameter of the boss is 1/3 rd of the diameter of the runner . The discharge is ؟
[5] A Francis turbine operates at its maximum efficiency point at h0 = 0.94, corresponding to a power specific speed of 0.9 rad. The effective head across the turbine is 160 m and the speed required for electrical generation is 750 rev/min. The runner tip speed is 0.7 times the spouting velocity, the absolute flow angle at runner entry is 70 deg from the radial direction and the absolute flow at runner exit is without swirl. Assuming there are no losses in the guide vanes and the mechanical efficiency is 100%, determine (i) the turbine power and the volume flow rate; (ii) the runner diameter; (iii) the magnitude of the tangential component of the absolute velocity at runner inlet; (iv) the axial length of the runner vanes at inlet.
A 5 MW turbine is developed under an effective head of 320 m. The turbine efficiency is85%. Velocity coefficient of the nozzle is 99%.(a)Select which is the appropriate turbine based on effective head. (b)What should be the wheel diameter in meters assuming it is 12 times the diameter of the jet?
A Kaplan turbine has the following specifications: H =25 ft., N=400 rpm; power = 650 hp. If the efficiency of the unit is 90%, estimate (a) the flow rate, (b) approxi-mate diameter of the runner, (c) turbine setting to avoid cavitation if the location is at sea level, and (d) turbine setting to avoid cavitation if the location of the unitis at an elevation of 5000 ft. The local temperature is 60°F.Ans: (a) Q=254 cfs; (c) Hs=5.8 ft.; (d) 0.12 ft.
It is desired to develop a 5 MW turbine under an effective head of 320 m. The turbine efficiency is85%. Velocity coefficient of the nozzle is 99%.(a)Select which is the appropriate turbine based on effective head.(b)What should be the wheel diameter in meters assuming it is 12 times the diameter of the jet?
Consider a family of turbines each having a flow coefficient phi = 0.4 blade aspect ratio H / b = 3 and Reynolds number Re = 10 ^ 5 Calculate and plot ne and ne versus degree of reaction for stage loading factors V of 1, 2 and 3 using Soderberg's correlation. For each loading factor find the degree of reactions which yield maximum nt and ns ,respectively
An axial flow turbine is operated at a pressure head of 24m and develops 24.2MW when rotating at 146 r/min. The tips of the blades are on a diameter of 4,72m and the hub diameter is 2,1m. If the hydraulic efficiency is 94% and the overall efficiency 88%, determine the inlet and exit angles of the blades at the mean radius. Assume free vortex flow towards the rotor and conditions for maximum power
It is desired to construct a hydraulic turbine for a hydraulic power plant to operate under the following conditions: discharge Q = 3.5 m3/s of water, the available net head = 290 meters, the hydraulic efficiency = 0.8, the rotating speed = 300 rpm. A Pelton wheel impulse turbine was selected with the following specifications: the bucket angle b2 = 160°, the coefficient of velocity for the nozzle is 0.98 and assume the friction coefficient k = 0.2. Determine the following:Jet Diameter to Wheel diameter ratio, dj/Dw. The Specific Speed in M.K.S., Ns.The computed head coefficient ϕ.The brake horsepower. The required number of Jets. The Pelton wheel diameter in meters.
A propeller turbine has been designed to develop 22,000 kW under a head of 20 m whilst turning 150 revolutions per minute. The relevant data is: hydraulic efficiency 95%; overall efficiency 86%; outer diameter 4.5 m, and diameter of the hub 2 m. Determine the runner vane angles at the hub and at the outer periphery. Assume that the turbine discharges without whirl at exit A. Determine the runner vane angles at the hub. B. Determine the runner vane angles at the outer periphery.
The mean radius of an axial flow reaction turbine is 2.6 ft. and the axial velocityis 25 ft./s. The wicket gates are turned at an angle such that relative velocity at theinlet flow makes an angle of -45° with the blade velocity. The wheel and hub radiiare 3.6 ft. and 1.6 ft., respectively. The turbine rotates at 240 rpm. If water leaves theblade in a purely axial direction, calculate H and all relevant angles.Ans: H=81.87 ft.; α1=31.8°; β2=20.93°
A Kaplan turbine delivering 40 MW works under a head of 35 m and runs at 167 rpm.The hub diameter is 2.5 m and runner tip diameter is 5 m. The overall efficiency is 87%.Determine the blade angles at the hub and tip and also at a diameter of 3.75 m. Also find the speed ratio and flow ratio based on tip velocity. Assume ηH = 90%. Outlet blade angle at the mean diameter