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the head of 81 m and spe ic pressure at the site is 1.03 k m². Calculate the maximum per tail water level to ensure cav

the head of 81 m and spe ic pressure at the site is 1.03 k m². Calculate the maximum per tail water level to ensure cav

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question
A Francis turbine has been manufactured to develop 15000 horse power at the head of 81 m and speed 375 r.p.m. The mean atmospheric pressure at the site is 1.03 kgf/cm² and vapour pressure 0.03 kgf/cm². Calculate the maximum permissible height of the runner above the tail water level to ensure cavitation free operation. The critical cavitation factor for Francis turbine is given by %c = 317 x 108 x N² where N is the specific speed of the turbine in M.K.S. units.
Transcribed Image Text:A Francis turbine has been manufactured to develop 15000 horse power at the head of 81 m and speed 375 r.p.m. The mean atmospheric pressure at the site is 1.03 kgf/cm² and vapour pressure 0.03 kgf/cm². Calculate the maximum permissible height of the runner above the tail water level to ensure cavitation free operation. The critical cavitation factor for Francis turbine is given by %c = 317 x 108 x N² where N is the specific speed of the turbine in M.K.S. units.
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