摘要
通过田间试验,评估了中心支轴式喷灌机非设计工况运行(行进速度和首部压力等)和配置(低压喷头、压力调节器和末端喷枪等)对喷灌机田间喷灌均匀性的影响。结果表明:设计工况下,赫尔曼-海恩均匀系数CUH和均匀分布系数DU均随行进速度提高而减小,当百分率计数器由30%提高到100%,采用低压喷头D3000时的CUH减小12.91%,DU减小6.35%;采用低压喷头R3000时的CUH减小10.50%,DU减小2.39%;首部压力大于设计入机压力0.16 MPa时,入口压力递增,CUH和DU基本保持不变;首部压力为0.08 MPa,采用D3000时,CUH减小14.04%,DU减小15.09%;采用R3000时,CUH减小13.37%,DU减小15.61%;末端喷枪全程开启,采用D3000时的CUH降低10.27%,DU减小14.13%;采用R3000时的CUH降低20.78%,DU降低23.15%;不配置压力调节器且平地条件下,在首部入机压力为0.12、0.16、0.20 MPa时,采用低压喷头D3000时的CUH分别减小1.23%、1.82%和6.51%,DU减小29.61%、14.87%和12.52%;采用R3000时的CUH分别减小9.26%、15.00%、17.19%,DU减小40.05%、32.45%和29.76%;这是由中心支轴喷灌机作业实际工况与设计工况不符引起的。
Irrigation system with center-pivot sprinkling system is considered as a system with the highest degree of automation so far. The uniformity in field is one of the important indicators to characterize performance of the center-pivot irrigation system. The off-design working condition was a common phenomenon in actual operation management. Taking Herman-Hein uniformity coefficient（ CUH） and distribution uniformity coefficient（ DU） as the evaluation indicators,the influence of off-design working conditions and configuration on uniformity was analyzed by field test. The results showed that CUHwas reduced by 12. 91%,DUwas reduced by 6. 35% with low pressure sprinkler D3000,and CUHwas reduced by 10. 50%,DUwas reduced by 2. 39% with low pressure sprinkler R3000 when moving speed was changed from 30% to 100%. When the inlet pressure of the center-pivot irrigation system was reduced from designed value of 0. 16 MPa to 0. 08 MPa,CUHwas reduced by 14. 04%,DUwas reduced by 15. 09% with D3000,and CUHwas reduced by 13. 37%,DUwas reduced by 15. 61% with R3000. When the end water spray gun was open,CUHwas reduced by 10. 27%,DUwas reduced by 14. 13% with D3000,and CUHwas reduced by 20. 78%,DUwas reduced by 23. 15% with R3000. Without pressure regulator under the condition of flat ground,when inlet pressures were 0. 12,0. 16,0. 20 MPa,CUHvalues of the centerpivot irrigation system with D3000 were reduced by 1. 23%,1. 82% and 6. 51%,DUvalues were reduced by 29. 61%,14. 87% and 12. 52%,and CUHvalues were reduced by 9. 26%,15. 00% and17. 19%,DUvalues were reduced by 40. 05%,32. 45% and 29. 76% with R3000,respectively.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2015年第12期62-66,116,共6页
Transactions of the Chinese Society for Agricultural Machinery
基金
国家高技术研究发展计划(863计划)资助项目(2011AA100507)
'十二五'国家科技支撑计划资助项目(2014BAD12B05)
黑龙江八一农垦大学培育资助项目(XZR2014-04)
关键词
中心支轴式喷灌机
均匀度
评估
运行工况
Center-pivot sprinkler irrigation system
Uniformity
Assessment
Operation condition
