滴灌两级支管田间管网水力特性研究

发布时间：2018-04-08 20:06

本文选题：滴灌　切入点：两级支管田间管网　出处：《西安理工大学》2017年硕士论文

【摘要】：田间管网是滴灌系统最基本的灌水单元。为了提高灌水质量,降低工程费用，，本文以采用数值模拟和理论分析相结合的方法,开展滴灌两级支管田间管网水力特性和计算方法研究，对滴灌田间管网的规划、设计和管理具有重要意义,主要研究成果如下:(1)提出了一种新型清灌田间管网布]形式。在现有的一级支管滴灌田间管网布置形式上,增加一级支管,形成一种新型的具有两级支管的滴灌田间管网,以增加滴灌田间管网控制面积,降低滴灌系统费用，且便于管理:基于能量和质量守恒原理,结合滴灌灌水器压力和流量关系经验公式,建立滴灌灌两级支管田间管网水力计算数学模型,井提出了其计算方法。采用这一模型,可计算田间管网中各滴灌灌水器的压力和流量。(2)运用建立的滴灌两级支管田间管网水力计算数学模型，开展滴灌两级支管田田田间管网数值模拟研究，分析了各级支管坡度、各级支管管径、各级支管孔口数和孔口间距、毛管坡度、毛管管径、滴头个数及滴头间距等因素对滴灌两级支管田间管网技术指标和经济指标的影响,技术指标包括灌水均匀度、流量偏差率和压力水头偏差率,经济指标主要是田间管网单位面积投资。(3)结合工程案例,以滴灌两级支管田间管网为基本灌水单元,设计一个加压滴灌系统。当其他条件相同,与一级支管田间管网为基本灌水单元的滴灌系统相比,以两级支管田间管网为基本灌水单元的滴灌系统灌水均匀度可提高1.62%,节省年费用10.83%,表明本文提出的以两级支管田间管网为基本灌水单元的滴灌系统技术和经济指标优于以一级支管田间管网为基本灌水单元的滴灌系统。
[Abstract]:Field pipe network is the most basic irrigation unit of drip irrigation system.In order to improve irrigation quality and reduce project cost, the hydraulic characteristics and calculation method of two-stage branch pipe network of drip irrigation were studied by combining numerical simulation and theoretical analysis, and the planning of field pipe network of drip irrigation was carried out.Design and management are of great significance. The main research results are as follows: 1) A new type of clean irrigation field pipe network is proposed.In order to increase the control area of drip irrigation pipe network and reduce the cost of drip irrigation system, a new type of drip irrigation field pipe network with two grade branch pipes is formed by adding first grade branch pipe in the present arrangement of field pipe network of drip irrigation.And it is easy to manage: based on the principle of conservation of energy and mass, combined with the empirical formula of the relationship between pressure and flow of drip irrigation emitter, the hydraulic calculation mathematical model of two-stage branch pipe network of drip irrigation is established, and the calculation method of well is put forward.Using this model, the pressure and flow rate of each drip irrigation emitter in the field pipe network can be calculated. Based on the established mathematical model of hydraulic calculation for the field pipe network of two grade branch pipes of drip irrigation, the numerical simulation study of the field pipe network in the field of the two grade branch irrigation system of drip irrigation can be carried out.The effects of the slope of branch pipe, the diameter of branch pipe, the number and spacing of branch pipe, the slope of capillary, the diameter of capillary, the number of emitters and the spacing of emitter on the technical index and economic index of field pipe network of two grade branch pipe of drip irrigation were analyzed.The technical indexes include uniformity of irrigation, deviation rate of discharge and deviation rate of head of pressure, economic index is mainly investment of unit area of field pipe network, combined with engineering case, taking two-grade branch pipe network of drip irrigation as basic irrigation unit,Design a pressure drip irrigation system.When other conditions are the same, compared with the drip irrigation system in which the primary branch pipe network is the basic irrigation unit,The irrigation uniformity of drip irrigation system with two-grade branch pipe pipe as the basic irrigation unit can be increased by 1.62and the annual cost can be saved by 10.83.The results show that the technique and economy of drip irrigation system based on two-grade branch pipe field pipe network are put forward in this paper.The standard is superior to the drip irrigation system with the primary branch pipe network as the basic irrigation unit.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：S275.6

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