OPERATION EVALUATION OF WATER DISCHARGE END SECTIONS IN THE CONDITIONS OF NARROW DOWNTHROW

A.V. BURLACHENKO, O.N. CHERNYKH, A. BRAKENI

Abstract


This article presents and discusses the results of model studies of culverts of high-pressure waterworks with a narrow tailwater, which were not taken into account in the design, construction and operation of the Kurpsai waterworks in Kyrgyzstan. The incorrectly developed design of the downstream devices significantly complicates the operation of the hydroelectric complex after its construction and renovation and leads to the creation of a possible emergency situation both at the hydroelectric complex itself and at the hydropower cascade, of which it is a part. The results of model hydraulic studies of the end sections of spillways with free-falling jets of high-pressure waterworks are presented. A comparative assessment of the use of various designs of downstream devices is given: erosion-free dampers in an expanding water-breaking area with different flare angles and various modified schemes of springboards for the parameters of the washout funnel in the outlet channel in relation to the terminal device of the surface spillway of the Kurpsai hydroelectric power station on the Naryn River in the Kyrgyz Republic.


Keywords


Deep spillway, Downstream, Energy dissipation, Springboard toe, Washout funnel

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