| Cite this article: | 李文军,莫彦,王振华,等.管道布置形式对毛管末端自动冲洗阀水力性能的影响研究[J].灌溉排水学报,0,():-. |
| Li Wenjun,MO Yan,Wang Zhenhua,et al.管道布置形式对毛管末端自动冲洗阀水力性能的影响研究[J].灌溉排水学报,0,():-. |
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| Study on the effect of dripline layout form on hydraulic performance of automatic flushing Valve |
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Li Wenjun1, MO Yan2, Wang Zhenhua1, Wang Jiandong3, Zhang Yanqun2, Gong Shihong2, Li Qiaoling2
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1.College of Water Conservancy and Architectural Engineerin, Shihezi University;2.Department of Irrigation and Drainage，China Institute of Water Resources and Hydropower Research;3.Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences
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| Abstract: |
| [Objective] To explore the response law of hydraulic performance of automatic flushing valve for drip irrigation under different dripline layout forms, and to provide theoretical basis for the design and application of automatic flushing valve in drip irrigation system. [Method] Four kinds of flushing valves were processed by 3D printing. The flushing valves were installed at the end of 0.5 m Φ16PE pipe (C1), a 48 m long dripline (C2), and two 48 m long driplines which were connected in parallel (C3). The response law of the flushing duration (FD), flushing water volume (FQ), flushing velocity (FV) and the minimum inlet pressure of the dripline required for flushing valve automatic closing (H1min) were studied. Under C2 and C3 treatment, the flushing velocity of single dripline decreases from 0.82~1.03 m/s to 0.34~0.66 m/s, and the difference between dripline inlet pressure H1 and flushing valve inlet pressure H2 is 0.114~0.132 Mpa and 0.047~0.088 Mpa, respectively. Compared with C2, H1min of C1 and C3 treatment decreased by 74.8% and 40.4% on average, respectively. When FD or FQ is the same, the order of H1 required for the four flushing valves is C2 > C3 > C1. When H2 < 0.05 Mpa, FD decreased quickly by 999.75 s/Mpa on average, while when H2 > 0.05 Mpa, FD decreased slowly by 164.7 s/Mpa on average. Regardless of dripline layout form, FD and FQ are quadratic functions of H2. [Conclusion] The FD and FQ are related to H2, and have nothing to do with the dripline layout form. When H2 > 0.05 Mpa, FD changes steadily and the flushing effect would be uniform. Connecting the flushing valve at the end of multiple driplines in parallel can reduce the system pressure for automatic closing of the flushing valve, and could improve the applicability of the flushing valve. However, whether the flushing performance can meet the flushing requirements needs further study. |
| Key words: Drip irrigation with Yellow River Water; Automatic flushing valve; flushing duration; flushing water volume; flushing velocity |
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