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Investigation of pressure fluctuations and ultrasonic cavitation emanations in the flow part of Francis turbines
Conclusions 1. To avoid major cavitation damage to flow elements of Francis turbines at nondesign heads, it is necessary to redistribute as much as possible the load on the units so that they operate for a long time in the region of the following most proper loads with respect to cavitation conditions: N=295 MW for heads of 72 m and N=408 MW for heads of 91 m. 2. With respect to the pressure fluctuation conditions in the draft tube (for H=91 m) the most proper loads are those varying in the range N=420–460 MW (N/Nmax=0.81–0.92). In this instance the admission of air under the turbine runner is recommended. 3. Equations (7) and (8) with the aid of graphs $$\bar A'_1 = \varphi (Sh)$$ (curves 1, 2, and 3 in Fig. 5) permit in the first approximation determining the main parameters of the harmonic components of the fluctuation of hydrodynamic forces acting on the draft tube elements of hydroelectric stations with Francis turbines.
Investigation of pressure fluctuations and ultrasonic cavitation emanations in the flow part of Francis turbines
Conclusions 1. To avoid major cavitation damage to flow elements of Francis turbines at nondesign heads, it is necessary to redistribute as much as possible the load on the units so that they operate for a long time in the region of the following most proper loads with respect to cavitation conditions: N=295 MW for heads of 72 m and N=408 MW for heads of 91 m. 2. With respect to the pressure fluctuation conditions in the draft tube (for H=91 m) the most proper loads are those varying in the range N=420–460 MW (N/Nmax=0.81–0.92). In this instance the admission of air under the turbine runner is recommended. 3. Equations (7) and (8) with the aid of graphs $$\bar A'_1 = \varphi (Sh)$$ (curves 1, 2, and 3 in Fig. 5) permit in the first approximation determining the main parameters of the harmonic components of the fluctuation of hydrodynamic forces acting on the draft tube elements of hydroelectric stations with Francis turbines.
Investigation of pressure fluctuations and ultrasonic cavitation emanations in the flow part of Francis turbines
Zhukovskii, V. F. (Autor:in) / Mikhailov, L. P. (Autor:in) / Murzin, A. P. (Autor:in) / Plokhotnikov, I. V. (Autor:in)
Hydrotechnical Construction ; 8 ; 141-145
01.02.1974
5 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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