摘要
为研究压力、喷头组合方式和插值方法对喷灌均匀系数CU和分布均匀系数DU这两个评价指标计算结果的影响规律，利用雨量筒径向间隔为lm的FY RB-471型喷头无风喷洒试验数据，模拟出了喷头在不同压力下的水量分布情况。在喷头矩形组合方式和正三角形组合方式下，采用线性插值、立方插值、三次样条插值、距离插值和平面插值法计算了不同压力下的喷灌均匀系数和分布均匀系数。结果表明，采用三角形组合方式比矩形组合方式计算的喷灌均匀系数CU高1．56～4．77个百分点，同样，三角形组合方式比矩形组合方式计算的分布均匀系数DU高4．26～9．19个百分点；不同的插值方法对喷灌均匀系数与分布均匀系数的计算结果影响不明显，而压力是影响喷灌均匀系数的一个重要因素。
Distribution uniformity （DU） and Christiansen uniformity coefficient （CU） are two important indicators for evaluating the hydrodynamic performance and irrigationg quality of sprinkler irrigation system. In order to research the impact of the pressure, sprinkler combinations and interpolation methods on the distribution uniformity and Christiansen uniformity coefficient, CU and DU were computed by linear interpolation, cubic interpolation, cubic spline twice interpolation, inverse distance weighting method and plane interpolation method with two combinations （rectangular and regular triangle） , and 1 m sampling space. Using the experimental data of FY RB -471 sprinklers without wind simulated the water distribution under different pressures. The results showed that CU calculated form rectangular combination date were less than form regular triangle combination date by 1.56% -4.77%. Similarly, DU calculated form rectangular combination date were less than form regular triangle combination date by 4.26% -9. 19%. Different interpolation methods for the calculation results of CU and DU are not obvious, while the pressure is an important factor for affecting the sprinkler uniformity.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2014年第11期159-164,200,共7页
Transactions of the Chinese Society for Agricultural Machinery
基金
'十二五'国家科技支撑计划资助项目(2011BAD29B08)
新世纪优秀人才支持计划资助项目(NCET-12-0473)
关键词
喷灌
喷头
均匀系数
水量分布
动态模拟
Sprinkler irrigation
Sprinkler
Uniformity coefficient
Water distribution
Dynamic simulation
