11.5 The first stage of a turbine is a two-row velocity compounded wheel. Steam at 40 barand 400 C is expanded in the nozzles to 15 bar, and has a velocity at discharge of700 m/s. The inlet velocity to the stage is negligible. The relevant exit angles are: nozzle18; first row blades 21"; fixed blades 26.5"; second row blades 35°. Take the bladevelocity coefficient for all blades as 0.9. The mean diameter of the blading is 750 mmand the turbine shaft speed is 3000 rev/min. Draw the velocity diagram for this wheeland calculate:(i) the diagram efficiency;(@) the stage efficiency.(70.8%; 67.4%)

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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; fixcd blades 26.5"; second row blades 35°. Take the blade velocity coefficient 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; (@) the stage efficiency. (70 8%: 674%)

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; fixcd blades 26.5"; second row blades 35°. Take the blade velocity coefficient 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; (@) the stage efficiency. (70 8%: 674%)

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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