Analytic method of hydraulic calculation of eddy shaft spillways: Fid-Bau Portal

Analytic method of hydraulic calculation of eddy shaft spillways

Volshanik, V. V. / Zuikov, A. L. / Mordasov, A. P.

Conclusions The investigated analytic methods of hydraulic calculation of eddy shaft spillways are based on laws of conservation and, unlike the earlier known ones, take into account not only the size and shape of the water passageway but also contraction of the flow upon entering the spiral chamber from the inlet channel or conduit, hydraulic losses of energy at the entry to the vertical shaft, and the presence here of a zone of equalization of the flow. In calculating the characteristics of the swirled flow over the height of the vertical shaft, its potential energy related to the effect of centrifugal body forces is taken into account.The investigated methods make it possible to obtain the calculated values of hydraulic characteristics of eddy shaft spillways and functions of the variation of the parameters of swirled flows in vertical shafts most closely coinciding with the experimental data. The deviations between experiment and calculation lie within the measurement accuracy. This enables recommending the given methods for practical use when designing eddy shaft spillways and for predicting and analyzing their operation.