| 引用本文: | 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,2022,41(5):110-117. |
| 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,2022,41(5):110-117. |
|
| 摘要: |
| 【目的】探究不同管道布置形式下毛管末端自动冲洗阀水力性能的响应规律，为冲洗阀在滴灌系统中的设计及应用提供理论依据。【方法】设置3种布置形式，分别为安装在φ16PE管末端（C1）、在1条48 m长滴灌带末端（C2）、在2条48 m长滴灌带并联后的末端（C3）利用3D打印加工了4种规格冲洗阀，共计12个处理，每个处理3个重复，研究管道布置形式对毛管末端自动冲洗阀水力性能的影响。【结果】在C2和C3布置形式下，单条毛管冲洗流速由0.82~1.03 m/s降低到0.34~0.66 m/s，毛管进口压力H1和冲洗阀进口压力H2的差值分别为0.114~0.132 MPa和0.047~0.088 MPa；相比于C2，C1和C3布置形式的自动关闭所需毛管进口压力最小值H1min分别平均降低了74.8%和40.4%；当冲洗时长FD或冲洗水量FQ相同时，4种规格冲洗阀所需的H1的大小顺序为C2＞C3＞C1；当H2＜0.05 MPa，FD下降幅度较大，平均为999.75 s/MPa，当H2＞0.05 MPa，FD下降幅度较慢，平均为164.7 s/MPa；无论管道布置形式，FD和FQ与H2成二次函数关系。【结论】FD和FQ与H2相关，与管道布置形式无关；当H2＞0.05 MPa时，FD变化稳定，冲洗效果比较均匀；多条毛管并联后连接冲洗阀可以降低冲洗阀自动关闭所需系统供压，提高冲洗阀的适用性，但冲洗性能能否满足冲洗要求还需要进一步研究。 |
| 关键词: 引黄滴灌；自动冲洗阀；冲洗时长；冲洗水量；冲洗流速 |
| DOI：10.13522/j.cnki.ggps.2021611 |
| 分类号: |
| 基金项目: |
|
| The Effects of Dripline Layout on Performance of Automatic Flushing Valve |
|
LI Wenjun, MO Yan, WANG Zhenhua, WANG Jiandong,
ZHANG Yanqun, GONG Shihong, LI Qiaoling
|
|
1. College of Water Conservancy and Architectural Engineerin, Shihezi University, Shihezi 832000, China;
2. Institute of Water Resources, China Academy of Water Resources and Hydropower, Beijing 100048, China;
3. Institute of Environment and Sustainable Development in Agriculture,
Chinese Academy of Agricultural Sciences, Beijing 100081, China
|
| Abstract: |
| 【Objective】The functions of drip-irrigation systems depend on many factors and in this paper, we investigated the performance of the automatic flushing valve as impacted by layout of dripline. 【Method】The experiment compared four flushing valves which were manufactured by 3D printing. They were then fixed at the end of the 0.5 m Φ16PE pipe (C1), a 48 m dripline (C2), and two 48 m long driplines connected in parallel (C3), respectively. The changes in flushing duration (FD), flushing water volume (FQ), flushing velocity (FV) and the minimum inlet pressure of the driplines required for the flushing valve automatic closing (H1min) under different layouts were measured and compared.【Result】The flushing velocity of the single dripline in C2 and C3 decreased from 0.82~1.03 m/s to 0.34~0.66 m/s, and the difference between the dripline inlet pressure H1 and flushing valve inlet pressure H2 was in the range of 0.114~0.132 MPa and 0.047~0.088 MPa, respectively. Compared with C2, C1 and C3 reduced H1min by 74.8% and 40.4% on average, respectively. When FD or FQ was the same, H1 required for the four flushing valves varied in the order of C2 > C3 > C1. When H2 < 0.05 MPa, FD decreased 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 the dripline layouts, FD and FQ are quadratic functions of H2. 【Conclusion】 The FD and FQ are related to H2, and independent of the dripline layouts. When H2 > 0.05 MPa, FD changes steadily and the flushing effect is uniform. Fixing the flushing valve at the end of multiple driplines in parallel reduces the system pressure for automatic closing of the flushing valve. However, further work is needed to test if the flushing performance meets the requirements in the field. |
| Key words: drip irrigation; automatic flushing valve; flushing duration; flushing water volume; flushing velocity |
