Injection performance of Venturi injector in micro-irrigation system
Yan Haijun1, Chu Xiaoyi1, Wang Min1, Ma Zeyuan2
(1.College of Water Conservancy and Civil Engineering, China Agricultural University, Beijing 100083, China; 2.Beijing East Interlink Eco-tech Co.Ltd., Beijing 100084, China)
Abstract:In order to study the relationship between the injection performance and the structural parameters of Venturi injector used in micro-irrigation system, injection performance tests of a kind of Venturi injector with four types of replaceable throat parts were conducted under inlet pressures of 0.10, 0.15, 0.20, 0.25 and 0.30 MPa, respectively. The results show that both the critical and maximum pressure differences are in positively linear relation with the inlet pressure. The inlet flow rate of the Venturi injector increases with the increasing of the inlet pressure or the difference between inlet and outlet pressures. As the ratio of outlet pressure to inlet pressure is less than 0.4, the ratio of injection rate to outlet flow rate increases with the decrease of the throat diameter and the increase of both the contraction and diffusion angles. As the ratio of outlet pressure to inlet pressure is greater than 0.4, the ratio of injection rate to outlet flow rate changes in an opposite trend. The established regression models describing the relationship between injection performance, throat geometry and working parameters can be used for design and operation of Venturi injector.
严海军, 初晓一, 王敏, 马泽远. 微灌系统文丘里施肥器吸肥性能试验[J]. 排灌机械工程学报, 2010, 28(3): 251-255.
Yan Haijun, Chu Xiaoyi, Wang Min, Ma Zeyuan. Injection performance of Venturi injector in micro-irrigation system. Journal of Drainage and Irrigation Machinery Engin, 2010, 28(3): 251-255.
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