ISWC OpenIR  > 水保所知识产出(1956---)
鞠学良1,2; 吴普特1,2; Weckler R. Paul3; 朱德兰2; 张林1,2
Source Publication农业工程学报

1.69 和1.00 时,单向毛管管径的设计参数取值分别为−1~≤2.801,−1~≤2.859 和−1~≤4;双向毛管管径的设计参数取值分别为0~≤
3.143,0~≤3.183 和0~≤4。满足流量偏差率设计标准和灌水器额定流量时,单向毛管管径将有1 或2 个设计值,双向毛管管径将有1、
2 或多个设计值。根据参数的取值范围,以坡降比参数为设计变量,推导了均匀坡下单向和双向毛管管径的计算公式。此外,进一步简化
管管径和进口工作水头,无需进行任何复杂的试算。设计案例1 表明在多数地形条件下,利用该文方法设计单向毛管的结果与传统方法
设计结果的相对误差不超过4%;设计案例2 表明该文方法设计双向毛管的结果与其他2 种常用方法设计结果的最大相对误差为4%。因

Other Abstract

A simple, direct, and easily adaptable analytical approach was developed for determining the appropriate diameter of
the drip laterals laid on uniformly sloping grounds. The emitter flow variation was used as the index of water application
uniformity. A diameter design parameter was developed by reformulating the analytical expressions of emitter flow variation of
the single inlet lateral and paired laterals. The relationship between parameter and pressure loss ratio were expressed by the graphs
and formulas. For the specific value of velocity exponent, the condition for designing the diameter of a single inlet lateral was the
calculation parameter lying between -1 and ≤2.801, between -1 and ≤2.859 and between-1 and ≤4, respectively; meanwhile,
the condition for designing the diameter of the paired laterals was the calculation parameter lying between 0 and ≤3.143,
between 0 and ≤3.183 and between 0 and ≤4, respectively. On the other hand, for the required emitter flow variation and
emitter design discharge, there would be one or two solutions of diameter for a single inlet lateral, and one, two or numerous
solutions for the paired laterals. Based on the ranges of the parameter, the design equations for the diameter of the single inlet
lateral and paired laterals were derived with the pressure loss ratio as the design variable. The analytical expressions of inlet
working pressure head of drip laterals were also simplified based on the energy gradient line method. When the emitter design
flow, emitter flow variation criterion, and lateral length were provided, the diameter and inlet working pressure head of the drip
laterals could be easily calculated without performing complex computer operations or tedious computations. In case 1, the
differences in the designed parameters of a single inlet lateral from the proposed approach and variable discharge method are less
than 4% for most ground slopes. In case 2, the maximum deviation in the design parameters of the paired laterals from the
proposed approach and previous two methods was ≤4%. These 2 cases indicated that the proposed approach could produce
accurate results as those of the previous methods for practical purposes. By using the developed analytical expressions and
regression relationships, the proposed approach provided a more simplified and adaptable design procedure than the traditional
methods. This research could provide valuable information for improving the hydraulic design of drip irrigation system.

Keyword灌溉 滴头 流速 滴灌 流量偏差率 管径 解析方法
Indexed By中文核心期刊要目总览
Document Type期刊论文
3.Department of Biosystems and Agricultural Engineering, Oklahoma State University
Recommended Citation
GB/T 7714
鞠学良,吴普特,Weckler R. Paul,等. 基于流量偏差率的滴灌毛管管径简易设计[J]. 农业工程学报,2016,32(5):14-20.
APA 鞠学良,吴普特,Weckler R. Paul,朱德兰,&张林.(2016).基于流量偏差率的滴灌毛管管径简易设计.农业工程学报,32(5),14-20.
MLA 鞠学良,et al."基于流量偏差率的滴灌毛管管径简易设计".农业工程学报 32.5(2016):14-20.
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