The article deals with the issue of the influence of flow velocity in water source on the change of hydraulic parameters of flat screen filter. The research was conducted to determine intensity and the level of impact of water source (canal) operation regime on flow capacity (hydraulic parameters) of water intake facilities equipped by screen filters instead of standard filtering cartridge of volume type at the maximal flow rate of pump station. Hydraulic parameters were determined on the base of field observation and statistical processing of data at the operation of inter-farm distributor and hydrosystem of pump station, as well as math simulation of hydraulic processes in screen filters at a skew junction of flow from water source to water intake facilities, and using analytical methods for determine parameters of the mentioned process. The model of flow movement along the screen at a skew junction to water intake facilities was proposed. On the base of the given model the relations for the full coefficient of hydraulic resistance and volumetric flow rate for screen filter were developed. Data of model and field study of water intake facilities have shown. According to the proposed model of flow movement along the screen at a skew junction, the increasing of water movement velocity in water source causes the increasing of cumulative coefficient of resistance for filtering device up to 0.368–0.499 depending on the change of velocity vector relative to the axis of mesh. The field study has justified that increasing of pressure loss in flat screen filter while flow velocity increasing up to 0.7 m/sec. in water source within the operation regime doesn’t reduce the penetration of inlet orifices of suction pipelines below minimal allowed level of 0.5 m.
Keywords: water intake facilities, flat screen filter, flow velocity, velocity vector, coefficient of hydraulic resistance, pressure loss, flow capacity.
