Constructive device for sediment flushing from water acceptance structure
Аннотация
Abstract The article discusses a constructive solution for sediment flushing from the water acceptance chamber of the pumping station, which is solved by using a guide wall raised above the bottom of the chamber. The wall is installed at a distance L 0 = (2.6 … 3)D i from the inlet of the suction pipe of the pump at an angle of 25.30° relative to the bottom of the chamber. Due to the installation of an inclined guide wall, the level difference is Δh = (0.08 … 0.1)D i , where D i is the diameter of the inlet of the suction pipe. To reduce the difference in water levels Δh = 9 … 11 cm from the action of the guide wall, through holes of rectangular cross-section are made in it with a width of D i and a height of 0.2D i . If the drag coefficient ξ for a chamber with sediment is ξ = 0.61, when washing off sediment it is equal to ξ = 0.491, so the pump flow from 424 l / s increased to 476 l / s, i.e. increased by 52 l / s. A comparative analysis of flushing sediment from the water acceptance chamber under laboratory conditions is compared with the results of the analysis under field conditions. According to the developed design, the pump efficiency increased by 5.9%, and the flow rate increased by 12.2%.