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
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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