Micro-pressure Hydraulic Performance Of The Porous Shunt Hose

With the strengthening of energy, water-saving awareness, micro-irrigation system, due to its low energy consumption, simple maintenance, easy to use, etc., has become one of the important direction of development of micro-irrigation technology, this article uses a combination of methods of laboratory tests and mathematical analysis starting from the impact of micro-pressure PE small caliber hose out of the flow and head loss factors, hose orifice flow and head loss law to provide some theoretical basis for the improvement and development of the micro-pressure micro-irrigation technology, through the test and analysis the following conclusions:(1) Calibrate head loss formula parameters(f, m, b values) anew. Calibration values:diameter6mm hose frictional head loss parameters (f, b, m) were4.285,4,0.835; diameter of10mm hose along the head loss parameters f, b, m values were4.84,4.75,1.494.(2) According to the test measured Orifice Discharge, correct the theoretical calculation and obtain the coefficient of orifice regulation,0.645. Porous pipe flow and head loss calculation and measured values are basically the same, the maximum deviation rate (12.55%), which can meet the needs of engineering design.(3) Whether the same total flow and head loss in the case of flow under the same working head pressure, the total outflow and head loss of porous hose is less than the corresponding non-porous hose.(4) The impact of changes in pressure head in the micro-pressure conditions on irrigation uniformity is not obvious, but the working head is greater than0.9m above uniformity of emergence of value-added;φ6tube water uniformity is basically under the same conditions is greater than the φ10tube water uniformity; uniformity decreases with increasing the length of the shunt. The uniformity of this test is greater than0.8to meet the requirements of irrigation uniformity.