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Analysis and research on sluice gate flow of a hydropower station under different working conditions

The rationality design of the sluice gate directly influences the flood control capacity of hydropower stations. To demonstrate the rationality of the creation of the spillway gate of a hydropower station in the Yellow River Basin, this paper adopts the method of combining model test with a mathematical model to study the pressure, flow velocity, and water level changes of the spillway gate of the hydropower station under the working conditions of check flood and design flood. The research results show that there is no negative pressure in the whole flood discharge sluice dam section under check flood and desert flood conditions. The pressure characteristics of each area of the sluice floor are good, and the velocity distribution is uniform. However, the outflow velocity of the reinforced cage section is greater than the anti-scour velocity of the river under the two working conditions, which impacts the downstream river, so it is necessary to increase the length of the reinforced cage section appropriately. The water flow falls twice in the spillway dam section. The initial position of the first fall is the same under two working conditions. However, the falling depth decreases with the decrease of reservoir water level. The second fall position moves backward with the reduction of the water level. This paper provides a theoretical reference for the demonstration of flood discharge capacity of other hydropower stations through the analysis and research of the flood discharge sluice state of this hydropower station.