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SOLVED: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 m^2. 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

SOLVED:A vertical-shaft Francis turbine is to be installed in a situa…

2023年9月14日

SOLVED: Estimate the maximum height of the straight conical draft tube of a 13,240 kW Francis turbine running at 150 rpm under a net head of 27 m. The turbine is installed at a station where the effective atmospheric pressure is 10.6 m of water. The draft tube must sink at least 0.77 m below the tailrace level. Also, assume the Critical Cavitation Factor oc is given by the following empirical relationship: oc = 0.625(Ns/380.78), where Ns is the specific speed in rpm.

SOLVED: Estimate the maximum height of the straight conical draf…

10 个月之前

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(a) What is a draft-tube? Why is it used in a reaction turbine? Descri…

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