Re2320Re≤2320X=1X=0.52~30.6000.4964~50.4850.4206~70.4460.3998~110.4200.388节水灌溉课程设计计算表注:1.Re为雷诺系数;2.微灌用聚乙烯管的f值相应于水温10℃,其他温度时应修正。表4多口系数F值m=1.74N硬塑料管D8mm聚乙烯管D≤8mm表3各种塑料管材的f、m、b值管材蔬菜粮、棉、油等作物葡萄、瓜类草、灌木作物果树、乔木表2微灌设计土壤湿润比(%)冷季型草暖季型草葡萄、瓜类果树蔬菜(露天地)粮、棉、油等作物表1作物耗水强度表作物蔬菜(保护地)12~200.3970.378100kpaATP-DT2L22ATP-DT4L44.1ATP-DT8L87.96mmNpSe1.60.51000ΥZ13500.6灌水器间距毛管间距SeSi0.52管径初选管径D(mm)D(mm)16\管径初选管径D(mm)D(mm)53.5439263管径初选管径D(mm)D1(mm)75.7225475摩阻系数管道长度管道管径流量计算管道水头损失计算表6灌溉设计计算表灌溉制度工作制度计算滴头间距100-150-200-250-300-330-500mm工作压力0.01-0.10Mpa流量0.85-1.2-1.5-1.8-2.2-3.0L/h表5滴头技术参数流量-压力对应关系滴灌带技术参数滴灌带直径壁厚0.15mm-0.6mm型号基本流量(L/h)fL(m)毛管\\0.505300.464830.464280H动水(m)h井(m)603.718管道水头损失计算支管分干管干管系统扬程确定X=1X=0.5X=1X=0.5X=1X=0.50.5960.4920.5820.4740.5720.4610.4810.4160.4660.3980.4550.3860.4420.3950.4260.3780.4150.3660.4160.3830.4000.3660.3890.354节水灌溉课程设计计算表注:1.Re为雷诺系数;2.微灌用聚乙烯管的f值相应于水温10℃,其他温度时应修正。表4多口系数F值m=1.77m=1.9m=20.5951.694.691.75140.4641.774.770.5051.754.75表3各种塑料管材的f、m、b值fmb60~9070~10060~9030~5040~70100滴灌、涌泉灌微喷灌25~4040~60表2微灌设计土壤湿润比(%)5~83~53~64~73~54~64~75~84~75~8表1作物耗水强度表滴灌(mm/d)微喷灌(mm/d)2~40.3940.3740.3780.3570.3660.345150kpa200kpa250kpa300kpa2.12.22.12.10.6x0.64.14.24.24.20.6x0.77.98881.2x0.712mm16mm20mmWSpSR1/SpSRPw(%)P(%)10.820.6250.50.4βmaxβminβ田η灌水定额m净灌水定额m毛0.21150.14123.50%0.9528.552530.0552632E(mm/d)T(d)T设(d)55.71055灌水器流量一次灌水延续q(L/h)时间t(h)3.48.8397832879灌水周期一天运行小最大轮灌组数T设(d)时数C(h)N51810.1812451毛管数滴头数轮灌组流量满足N1N2qQ(m3/h)要求3031633.92842105流速每条毛管流量V(m/s)Σq(L/h)\1130.94737流速每条支管流量V(m/s)Qi(m3/h)1.512447816.9642105流速初选管径流速初选管径流速干管流量V(m/s)D2(mm)V2(m/s)D3(mm)V3(m/s)Q(m3/h)2.492901.68521101.11859233.9284211流量指数管径指数管道内径多口系数管道流量沿程水头损失表6灌溉设计计算表100-150-200-250-300-330-500mm0.01-0.10Mpa0.85-1.2-1.5-1.8-2.2-3.0L/h表5滴头技术参数流量-压力对应关系0.15mm-0.6mm紊流流通尺寸大小(mm)mbd(mm)FQ(m3/h)hf(m)\\\\\101.754.75630.37816964.2110.4101.774.7784.4133928.4212.6061.774.77103.6133928.4213.308h滤首(m)H干(m)H(m)1217.08392.801干管局部水头损失hj(m)分干管管水头损失h干(m)干管进口压力H干(m)0.3973.70417.083分干管局部水头损失hj(m)分干管管水头损失h分干(m)分干管进口压力H分干(m)0.3132.91913.378支管局部水头损失hj(m)支管水头损失h支(m)支管进口压力H支(m)0.0490.45910.459节水灌溉课程设计计算表