摘要
本文定义了经验系数a_1(a_2),并由此建立了微灌毛管上最大(最小)灌水器流量与平均流量间的关系式,计算并绘出了地形坡降J=-0.05～0.05、流态指数x=0.49～0.762、流量q=3.79～40.98L/h、流量偏差q=0.10～0.24范围内a_1的变化值,论证了a_1=0.65吋,产生的计算误差在3％以内,因此可在微灌设计中应用;并列出了按经验系数法计算毛管的步骤,并示以算例。
This Paper defines experiential coefficient α_1(α_2), by which a relationship between the maximum (minium) and average discharge in Micro-Irrigation Lateral is formed. This paper calculates the variable value of α_1 when topography gradient is equal to -0.05～0.05, flow region index x=0.49～0.762, discharge Q=3.79～40.98L/h, flow deviation:q_v=0.10～0.24, and proves that calculation error is which 30% when α_1 is equal to 0.65. For this reason, the method may be applied to Microirrigation designing. Besides, Steps of Lateral calculation are formulated with this method.
出处
《喷灌技术》
北大核心
1991年第1期4-8,64,共5页
关键词
微灌
毛管
水力设计
计算法
Micro-irrigation, Lateral, Hydraulic design.
