Unsteady processes in reversible hydraulic machines and consideration of their special characteristics in the design of penstocks for pumped-storage plants
The unsteady phenomena which occur in the internal passages of reversible hydraulic machines and whose intensity is unusually high are stable and propagate, with only a small attenuation along the penstock, to a considerable distance.
The complex form of the action of unsteady processes caused by large pressure fluctuations in penstocks does not make it possible at the present time to obtain a theoretical solution of the problem of determination of the loads acting on the penstock shells along their entire length.
The experimental investigations carried out at the factories on reversible hydraulic machines are not sufficiently adequate, since they do not reproduce the operating conditions of the penstock or the effect of the latter upon the pressure pulsations in the scroll case.
The unsteady phenomena which occur in the internal passages of reversible hydraulic machines, the distribution of the pressure fluctuations along the penstocks, and the regulation regimes of reversible units can be simulated by using for the penstock model a material having a considerably lower modulus of elasticity than that of the prototype material.
KeywordsAttenuation Pressure Pulsation Renewable Energy Source Regulation Regime Pressure Fluctuation
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