Optimal Design And Experimental Study Of Water And Fertilizer Integrated Drip Irrigation Pipe Network

Pipe network is an important basic unit in drip irrigation systems.In order to improve the irrigation efficiency and the planting density of irrigation district,this thesis has taken the research on the hydraulic performance of water and fertilizer integrated drip irrigation pipe network,combining the theory and simulation.It has a high practical reference on the planning and designing of the field pipe network.The main research achievements are as follows:1.By using ANSYS software,it constructs a model of a venturi fertilizer,and adjusts the parameters to figure out the major factors on the on the hydraulic performance of the Venturi applicator.it has derived the conditions for the fertilizer operation in the venturi fertilizer.2.Combining the AMESim software and the data analysis for the experiment,the thesis calculates the flow deviation coefficient of the last drop hole under the given length of the capillary with different drop spacing and the expression formula of the average flow deviation coefficient of each outlet of the branch pipe.According to each flow deviation coefficient,it has established a flow deviation rate expression for calculating the last drop of any capillary under the given length.3.By adjusting the angle of drip hole,and observing the trend of irrigation diffusion,it has analyzed the factors affecting the diffusion area.And the experiment shows that the drop angle of 0° and 90° needs 41.89% and 40.13% demand rates respectively,while the latter one has reduced 2 minutes compared to the former,with the improvement of water utilization.4.By changing the number and the angle of dripping holes in irrigation districts,the thesis has optimized the pipe network considering the economy of pipe network and the reliability of water supply.Comparing the results and the ordinary design,it shows that the flow deviation rate of ordinary pipe network is 15% according to the recommendation of technical manual,and the flow deviation rate is controlled within 10% according to adjusting the spacing of drop holes,and the number of crops planted in the whole irrigation area is increased by 856 plants.