排灌机械工程学报
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Journal of Drainage and Irrigation Machinery Engin  2010, Vol. 28 Issue (3): 251-255    DOI: 10.3969/j.issn.1674—8530.2010.03.016
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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)
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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.
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YAN Hai-Jun
Chu-Xiao-Yi
Wang-Min
MA Ze-Yuan
Key wordsVenturi injector   micro-irrigation   injection performance   test     
Received: 2009-11-03; Published: 2010-05-30
Cite this article:   
YAN Hai-Jun, Chu-Xiao-Yi, Wang-Min et al. Injection performance of  Venturi injector in micro-irrigation system[J]. Journal of Drainage and Irrigation Machinery Engin, 2010, 28(3): 251-255.
 
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