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| Effect of pipeline layout of fertilizer applicator on performance of Venturi injector |
| WANG Haitao1,2, WANG Jiandong2*, YANG Bin1, GUO Shanqiang3, MO Yan1,ZHANG Yanqun1 |
| 1. Department of Irrigation and Drainage, China Institute of Water Resources and Hydropower Research, Beijing 100048, China; 2. Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China; 3. School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, Shandong 255049, China |
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Abstract To explore the effect of different pipeline layouts in fertilizer applicator on Venturi injectors performance, multi-channel fertilizer applicators were tested with five same Venturi injectors for diffe-rent main pipe pressure and two pipeline layout modes. The results showed that compared with bypass-pushing-fertilizer pipeline, the numbers of Venturi injector channels with high efficiency can be dominated by bypass-pulling-fertilizer pipeline, up to a maximum of six. What′s more, bypass-pulling-fertilizer pipeline layout mode can meet accurate ratio fertilization of more various nutrient medium si-multaneously, and it can be applied to drip irrigation system that has a wider range of main pipe pressure compared with bypass-pushing-fertilizer mode. When the number of channels is less than 3, the ave-rage suction amount of single channel for bypass-pushing-fertilizer mode decreases with the increase of pressure, however, the average suction amount of single channel for bypass-pulling-ferti-lizer mode could keep stable. Under the same number of channels, the total suction volume flow and proportion of fertilizer injection for bypass-pulling-fertilizer mode are obviously higher than those for bypass-pushing-fertilizer mode, and ″three channels+ bypass-pulling-fertilizer mode″ can be recommended as an optimal pipeline layout mode for fertilizer applicator.
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Received: 08 December 2018
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