Forebays of the poligonal cross-section of the irrigating pumping station

Abstract

The article discusses the use of the design of the forebays of a polygonal cross-section to improve the hydraulic characteristics of the water intake structures of pumping stations, in which the longitudinal slope in the direction of the middle chamber is i = 0.1, the adjacent longitudinal slope is 0.15 and with the extreme chambers the longitudinal the slope is 0.2. The faces of each chamber with a forebay have a transverse slope equal to i c = 0.1 and the angle of taper of the forebays in the plan is α = 35°. In the joint operation of 5 pumps, for the forebays of a polygonal cross-section, the total resistance coefficient is ∑ξ total ext. = 0.568 and for a typical ∑ξ total ext. = 0.72. With the simultaneous operation of 5 pumps, the average supply of 3 pumps is 0.0051 m3/s, 2, and 4 pumps, respectively 0.00498 … 0.00504 m 3 /s, for 1 and 5 pumps, 0.00478, and 0.00481 m 3 /s, respectively at the extreme pumps, the flow rate increases by 4.9…6.3% relative to the standard forebays.