安装不同规格滴头的毛管各分段长度可按图解法进行设计,其内容和步骤分述如下。 一、根据灌区内作物、水源、土壤、地形、气象和动力等方面的因素,确定系统规划设计的标准及滴头的平均流量q和安装间距S。经过初步计算,确定毛管上允许的流量偏差率q_v,毛管长度L、毛管内径D以及滴头的类型。 二、根据计算的毛管水头损失h_f和毛管铺设坡度Sd值的大小判断H_l曲线的类型定出H_(nfn)和H_(rax)的大小及位置,然后根据公式绘制H_t曲线图(见图1),H_l为 The installation of different specifications drip capillary length of each segment can be designed according to graphic method, the contents and steps are described below. First, according to the irrigated area crops, water, soil, topography, meteorology and power and other factors, to determine the system planning and design standards and drip the average flow q and installation spacing S. After a preliminary calculation to determine the capillary flow rate allowed deviation q_v, capillary length L, capillary diameter D and dripper type. According to the calculated capillary head loss h_f and capillary laying slope Sd value determine the size of H_l curve determine the size and position of H_ (nfn) and H_ (rax), and then draw the H_t curve according to the formula (see Figure 1) , H_l is