High head pump-turbines

Fluid reaction surfaces (i.e. – impellers) – Rotor having flow confining or deflecting web – shroud or... – Radially extending web or end plate

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416223B, F01D 510, F04D 2922

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active

052901483

ABSTRACT:
When the trigonometric function of the phase lag of the hydraulic excitation of the runner vanes, which varies in accordance with the combination of the number of runner vanes and the number of guide vanes of a high head pump/turbine, is denoted by cos(.theta..sub.R n), the thickness of the crown along a circle of a diameter at a mid point of the diameter of the outermost periphery of the runner is denoted by t.sub.MC, the thickness of the band is denoted by t.sub.MB, the mean thickness of the crown at the outer peripheral portion of the runner is denoted by t.sub.C, the mean thickness of the band is denoted by t.sub.B, and the rigidity ratio of the crown and band to the runner vane is denoted by K.sub.R taking the rigidity of the runner vane as a reference, the moment coefficient C.sub.MO which is a function of cos(.theta..sub.R N) and the rigidity ratio K.sub.R is selected to be less than 0.5 in accordance with the value of cos(.theta..sub.R n), and relations t.sub.C /t.sub.MC .ltoreq.1 and t.sub. B /t.sub.MB .ltoreq.1 are selected when the value of cos(.theta..sub.R m) is positive and relations t.sub.C /t.sub.MC .ltoreq.1 and t.sub.B /t.sub.MB .ltoreq.1 are selected when the value of cos(.theta..sub.R n) is negative.

REFERENCES:
patent: 3642379 (1972-02-01), Swearingen
patent: 3756738 (1973-09-01), Lee
patent: 4108570 (1978-08-01), Yamabe
Patents Abstracts of Japan, vol. 9, No. 272 (M-425) [1995]. 30th Oct. 1985; & JP-A-60 116 874 (Toshiba K.K.) Jun. 24, 1985.

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