The first stage of a turbine is a two-row velocity compounded wheel. Steam at 40 bar and 400 "C is expanded in the nozzles to 15 bar, and has a velocity at discharge of 700 m/s. The inlet velocity to the stage is negligible. The relevant exit angles are: nozzle 18°; first row blades 21°; fixed blades 26.5°; second row blades 3S. Take the blade velocity cocfficient for all blades as 0.9. The mean diameter of the blading is 750 mm and the turbine shaft speed is 3000 rev/min. Draw the velocity diagram for this wheel and calculate: (i) the diagram efficiency; (ii) the stage efficiency.

The first stage of a turbine is a two-row velocity compounded wheel. Steam at 40 bar and 400 "C is expanded in the nozzles to 15 bar, and has a velocity at discharge of 700 m/s. The inlet velocity to the stage is negligible. The relevant exit angles are: nozzle 18°; first row blades 21°; fixed blades 26.5°; second row blades 3S. Take the blade velocity cocfficient for all blades as 0.9. The mean diameter of the blading is 750 mm and the turbine shaft speed is 3000 rev/min. Draw the velocity diagram for this wheel and calculate: (i) the diagram efficiency; (ii) the stage efficiency.

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

The first stage of a turbine is a two-row velocity compounded wheel. Steam at 40 bar
and 400 °C is expanded in the nozzles to 15 bar, and has a velocity at discharge of
700 m/s. The inlet velocity to the stage is negligible. The relevant exit angles are: nozzle
18°; first row blades 21°; fixed blades 26.5°; second row blades 35°. Take the blade
velocity cocfficient for all blades as 0.9. The mean diameter of the blading is 750 mm
and the turbine shaft speed is 3000 rev/min. Draw the velocity diagram for this wheel
and calculate:
11.5
(i) the diagram efficiency;
(ii) the stage efficiency.
(70.8%: 67.4%)

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