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In the UK, a power station with an available head of 220m, has four Francis turbines, each with a rated output of 40MW a
Posted: Wed Apr 27, 2022 7:24 pm
by answerhappygod
- In The Uk A Power Station With An Available Head Of 220m Has Four Francis Turbines Each With A Rated Output Of 40mw A 1 (177.45 KiB) Viewed 36 times
In the UK, a power station with an available head of 220m, has four Francis turbines, each with a rated output of 40MW and connected to a generator with 7 pole pairs. At their design point, they have an efficiency of 95%. (a) Assuming a local blade velocity of 42 m/s and a blade angle of 17° at the outlet, discuss any assumptions you make to calculate: (i) The dynamic head at the outlet, (ii) The draft tube radius, and (iii) The runner outlet dimensions (area and blade height). (b) Assuming a runner with constant height, determine the runner blade angle at the inlet if the runner diameter is 50% larger than the outlet diameter. (1 (c) Calculate the required angle of the guide vanes. ( End of Question Paper