Problem (5.2) An impulse turbine has a number of pressure stages (pressure compounded turbine). The nozzle angle in the first stage is 20° and the blade exit angle 30°. The blade speed =120 m/s and the velocity of steam leaving nozzle =300 m/s. If the blade velocity coefficient =0.8 and the nozzle efficiency 0.85, find the work done per kg steam and the stage efficiency. If the steam supplied to the first stage is at 2 MPa and 250°C and the condenser pressure =0.01 MPa estimate the number of stages required.

Problem (5.2) An impulse turbine has a number of pressure stages (pressure compounded turbine). The nozzle angle in the first stage is 20° and the blade exit angle 30°. The blade speed =120 m/s and the velocity of steam leaving nozzle =300 m/s. If the blade velocity coefficient =0.8 and the nozzle efficiency 0.85, find the work done per kg steam and the stage efficiency. If the steam supplied to the first stage is at 2 MPa and 250°C and the condenser pressure =0.01 MPa estimate the number of stages required.

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

Problem (5.2) An impulse turbine has a number of pressure stages
(pressure compounded turbine). The nozzle angle in the first stage is 20°
and the blade exit angle =30°. The blade speed =120 m/s and the velocity
of steam leaving nozzle =300 m/s. If the blade velocity coefficient =0.8
and the nozzle efficiency =0.85, find the work done per kg steam and the
stage efficiency. If the steam supplied to the first stage is at 2 MPa and
250°C and the condenser pressure =0.01 MPa estimate the number of
stages required.
Ans. [36 kJ/kg, 68 %, x 4 ]

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