Research on Pressure Head Distribution and Allowed Maximum Length of Orifice Outlet Drip Irrigation Laterals
Research on Pressure Head Distribution and Allowed Maximum Length of Orifice Outlet Drip Irrigation Laterals
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发表时间：
2014
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通讯作者：
Chang Huan-hua
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作者：
Chang Huan-hua
本文根据微灌工程水头损失的一般公式，在实际水头线孔口流简化的基础上，用微分法推导出摩阻水头损失的一般方程，并根据能量方程推导出沿管沿着水头的计算公式，给出了不同坡度下最大允许长度的确定方法，为判断出流是否满足流量允许偏差比提供了依据，计算微灌的均匀系数，同时利用本文提出的方法确定允许的最大长度和管网布置，可节省投资，为滴灌工程设计提供理论参考。
In this paper,according to the general formula for the head loss of micro-irrigation project and based on orifice flow simplification of actual head line,the general equation of frictional head loss is worked out by using the differential method.According to the energy equation,the calculation formula of pressure head along the capillary,and the method for determining the maximum allowable length is given under different slopes.Providing a basis judgment of whether the outflow can meet the allowable deviation ratio of flow rate and for the calculation of the uniformity coefficient of micro-irrigation,while making use of the proposed method to determine the allowed maximum length and the layout of the pipe network,can save investment and provide a theoretical reference for the design of drip irrigation project.