Assignment 10.1A Pelton turbine is designed to develop power having a wheel diameter D = 2.5 m, a water headat the inlet of the nozzle of H = 500 m and a flow rate of Q = 3 m³/s, with a rotating speedN = 290 rpm. The nozzle efficiency nn = 0.95, the relative flow exiting from the bucket issuch that a = 165° and the velocity coefficient of the bucket is Cyp = 0.96. Assume that themechanical and volumetric efficiencies are respectively nm = 0.9 and 7, = 0.96.1) Calculate the different velocity components (U,V,W,Vµ, Wy, V,) and draw the velocitydiagrams at the inlet and outlet of the bucket.2) Determine: i) the hydraulic efficiency nh, ii) the output power P;, iii) the output torque T; andiv) the jet diameter dn.3) Calculate the maximum hydraulic efficiency h.max and the corresponding power shaft andtorque4) State briefly why a Pelton turbine is an impulse turbine.BucketTop viewJetaUNozzleW2

Given data in thequestion areWheel diameter (D)=2.5 mWater head (H)=500 mFlow rate (Q)=3…

A Pelton turbine is designed to develop power having a wheel diameter D = 2.5 m, a water hea at the inlet of the nozzle of H = 500 m and a flow rate of Q = 3 m³/s, with a rotating spee N = 290 rpm. The nozzle efficiency nn = 0.95, the relative flow exiting from the bucket %3D such that a = 165° and the velocity coefficient of the bucket is Cyp = 0.96. Assume that th mechanical and volumetric efficiencies are respectively 7m = 0.9 and 7, = 0.96.

A Pelton turbine is designed to develop power having a wheel diameter D = 2.5 m, a water hea at the inlet of the nozzle of H = 500 m and a flow rate of Q = 3 m³/s, with a rotating spee N = 290 rpm. The nozzle efficiency nn = 0.95, the relative flow exiting from the bucket %3D such that a = 165° and the velocity coefficient of the bucket is Cyp = 0.96. Assume that th mechanical and volumetric efficiencies are respectively 7m = 0.9 and 7, = 0.96.

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

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Question

Assignment 10.1
A Pelton turbine is designed to develop power having a wheel diameter D = 2.5 m, a water head
at the inlet of the nozzle of H = 500 m and a flow rate of Q = 3 m³/s, with a rotating speed
N = 290 rpm. The nozzle efficiency nn = 0.95, the relative flow exiting from the bucket is
such that a = 165° and the velocity coefficient of the bucket is Cyp = 0.96. Assume that the
mechanical and volumetric efficiencies are respectively nm = 0.9 and 7, = 0.96.
1) Calculate the different velocity components (U,V,W,Vµ, Wy, V,) and draw the velocity
diagrams at the inlet and outlet of the bucket.
2) Determine: i) the hydraulic efficiency nh, ii) the output power P;, iii) the output torque T; and
iv) the jet diameter dn.
3) Calculate the maximum hydraulic efficiency h.max and the corresponding power shaft and
torque
4) State briefly why a Pelton turbine is an impulse turbine.
Bucket
Top view
Jet
a
U
Nozzle
W2

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