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| DOI：10.13522/j.cnki.ggps.20180627 |
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| Experimental Study on Water Head Loss Along Thin-wall Spray-irrigation Pipe |
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GOU Wanli, YANG Luhua, DI Zhigang, WANG Jinyi
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1.College of Water Conservancy Engineering, Tianjin Agricultural University, Tianjin 300384, China; 2.Tianjin Agricultural Water Conservancy Technology Engineering Center, Tianjin 300384, China
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| Abstract: |
| 【Objective】 Energy loss is an important parameter in designing pipe network, and this paper experimentally studied water head loss in thin-wall spray-irrigation pipes. 【Method】 The control variable method and L9(34) orthogonal test were used to examine water head loss along thin-wall spray-irrigation pipes with diameter of N43 mm, N45 mm, N50 mm and N64 mm respectively. The flow rate and water head loss in each experiment were measured, from which we analyzed the impact flow rate, length and diameter of the pipe on water head loss. We then proposed a frictional resistance coefficient, modified the formula for water head loss, and applied it to the thin wall spray-irrigation pipe. 【Result】 The water head loss increased with operating pressure and the length of the pipe. The associated F value for impact of the pipe diameter, flow rate and the pipe length on water head loss was 90.314, 26.056 and 19.041 respectively, indicating that water head loss was most affected by pipe diameter and least by pipe length with flow rate between.【Conclusion】The modified formula for calculating water head loss was consistent with experimental data. |
| Key words: thin-wall micro spray-irrigation pipe; water head loss; water head loss parameter; frictional resistance coefficient |
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