Study On Hydraulic Performance Of Sprinkler Irrigation Bidirectional Flow Stabilizer And Lateral Pipe

The comb ination of laboratory test,numerical simulation and theoretical analysis is used to study the hydraulic performance of sprinkler irrigation bidirectional flow stabilizer and its influence on the hydraulic performance of sprinkler irrigation pipe.It has certain guidance for improving sprinkler irrigation quality and economic benefit.significance.The main research results are as follows:(1)Two kinds of bidirectional flow stabilizers with different structural parameters were fabricated and installed before the nozzle inlet.The influence of the bidirectional flow stabilizer on the hydraulic performance of the nozzle was analyzed by comparison.The internal energy consumption of the two bidirectional flow stabilizers was calculated.The results show that the flow state indexes of the nozzles are 0.43 and 0.46 respectively after installing the two-way flow stabilizer.The flow index(0.55)of the nozzle is significantly lower than that of the two-way flow stabilizer,and the hydraulic performance is signif icantly improved.Two kinds of bidirectional flow The maximum pressure difference between the front and rear ends of the stabilizer is 15,61%and 7.58%,respectively,which can improve the hydraulic performance of the nozzle.(2)When numerical simulation of bidirectional flow stabilizer is carried out using FLUENT software,the standard k-s model is selected,the mesh size is set to 0.4mm,,and the error between the test result and the numerical simulation result is less than 3%.The results of numerical simulation show that the distance between the water-separating part and the side wall of the two-way flow stabilizer has the greatest influence on the flow state index and is positively correlated.The influence of the angle between the water-distributing device and the horizontal direction on the flow coefficient is significant.,is a negative correlation.The pressure field and velocity field of the flow channel are analyzed.The bidirectional flow stabilizer produces a large amount of hedging and mixing through the internal contraction and expansion of the cross section and the interaction between the positive and negative 2 streams.The local head loss eliminates the excess pressure on the nozzle inlet and improves the uniformity of the nozzle discharge.(3)Based on the principle of conservation of energy and mass,a nonlinear equation for hydraulic calculation of branch pipe is established.The distribution of pressure and flow of each nozzle on the branch pipe with and without bidirectional flow stabilizer can be analyzed and calculated.The calculation results show that the installation of the two-way flow stabilizer can greatly extend the length of the branch pipe,and the pressure difference and the flow difference are smaller than those of the two-way flow stabilizer.Therefore,the installation of the two-way flow stabilizer on the sprinkler branch can improve the quality of the irrigation economic benefits.(4)The nonlinear equations for hydraulic calculation of the bidirectional flow stabilizer branch of the upper nozzle are proposed.The comparison shows that the two-stage flow stabilizer is installed on some nozzles on the branch pipe.The flow difference of the branch pipe is smaller than that of the branch pipe.The value of the flow device indicates that this form is more conducive to improving irrigation quality and economic benefits.