Maurice Tutor

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  • MCS,PHD
    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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  • Professor
    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 08 Jan 2018 My Price 5.00

circumferential area of flow

A vertical-shaft Francis turbine is to be installed in a situation where a much longer draft tube than usual must be used. The turbine runner is 760 mm diameter and the circumferential area of flow at inlet is 0.2 m2. The overall operating head is 30 m and the speed 39.27 rad ·s−1 (6.25 rev/s). The guide vane angle is 15◦ and the inlet angle of the runner blades 75◦. At outlet water leaves the runner without whirl. The axis of the draft tube is vertical, its diameter at the upper end is 450 mm and the (total) expansion angle of the tube is 16◦. For a flow rate of Q(m3 ·s−1) the friction loss in the tube (of length l) is given by  = 0.03Q2l. If the absolute pressure head at the top of the tube is not to fall below 3.6 m of water, calculate the hydraulic efficiency of the turbine and show that the maximum permissible length of draft tube above the level of the tail water is about 5.36 m. (The length of the tube below tailwater level may be neglected. Atmospheric pressure ≡ 10.33 m water head.)

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Maurice Tutor
(5)
Status NEW Posted 08 Jan 2018 10:01 PM My Price 5.00

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