Study On The Adaptability Of Dripper Design Operation Pressure And Ground Elevation

In order to match the working pressure of the drip irrigation design with the ground surface changes,further reduce the energy consumption of the drip irrigation system and improve the economic benefits of the drip irrigation system,this study established a capillary flow estimation model using artificial neural networks through simulation calculations.This test satisfies the irrigation quality of drip irrigation system and reduces the system cost,analyzes the influence of different terrain conditions on the irrigation uniformity of drip irrigation system,and determines the relationship between the maximum ground height difference,the laying length of capillary and irrigation uniformity under different terrain conditions,providing theoretical support for the development and application of drip irrigation systems.The main conclusions are as follows:(1)Established capillary flow estimation model with high accuracy and adaptability.(2)Capillary tube inlet pressure and inlet flow rate accord with power function,capillary length,capillary slope,dripper spacing and flow coefficient significantly affect the fitting coefficient(a),capillary slope and flow index significantly influence the fitting index(b).(3)In positive slope and the maximum irrigation uniformity,when the length of the capillary is constant,the design pressure of the dripper decreases with the decrease of the capillary laying slope;when the capillary slope is fixed,the dripper design head pressure shows a decreasing trend with the increase in the length of the capillary tube.(4)When the design pressure of the dripper is fixed,the laying method of the capillary tube and branch tube has a great influence on the uniformity of irrigation.By comparing and analyzing the different laying methods of capillary tube and branch tube in the irrigation area,the optimal combination of length,slope and dripper design working pressure of the irrigation area was obtained.It is suggested that in drip irrigation design: when the length of the irrigation plot is 30-90 m,the gradient of the plot is 2%-3%,and the design pressure of the emitter is 2-4m,it is recommended that the branch pipe be laid vertically along the contour line;when the design pressure of the dripper is 8-10 m,it is recommended that the capillary be laid perpendicular to the contour line;When the length of the irrigation plot is 90-120 m,the gradient of the plot is 3%,and the working pressure of the dripper design is 2-4m,it is recommended that the branch pipe be laid vertically along the contour line;When the dripper design work pressure is 6-10 m,it is recommended that the capillary tube be laid perpendicular to the contour line;when the cell slope is 1%,and the design pressure of the dripper is 2-10 m,it is recommended that the capillary pipe be laid perpendicular to the contour line.(5)Irrigation uniformity decreases with the increase of the maximum ground height,and increases with the average head pressure of the dripper.In the case of ensuring that the uniformity of irrigation can be maintained at more than 90%,it is recommended that in the design of drip irrigation,when the capillary length is within 30m-60 m and the maximum ground height is 0.4m-0.8m,the dripper design minimum work pressure can be set to 4m;when the maximum ground height difference is 0.8m-1.0m,the minimum dripper design working pressure can be set to 6m;When the laying length of the capillary is in the range of 60m-90 m and the maximum ground height difference is 0.4m-0.6m,the working pressure of the dripper design can be set to a minimum of 4m;when the maximum ground height difference is 0.6m-1.0m,the working pressure of the dripper design can be set to a minimum of 6m;when the laying length of the capillary tube is within the range of 90m-120 m,the maximum ground height difference is 0.4m-0.6m,the design pressure of the dripper can be set to a minimum of 4m;When the maximum ground height difference is 0.6m-0.8m,the working pressure of the dripper design can be designed to a minimum of 6m;when the maximum ground height difference is 0.8m-1.0m,the design pressure of the dripper can be designed to a minimum of 8m.(6)When the capillary length is constant,there is a linear correlation between the flow rate deviation ratio and the uniformity of irrigation.The correlation between flow rate deviation rate and irrigation uniformity is gradually reduced with the increase of capillary length.