排灌机械工程学报
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Journal of Drainage and Irrigation Machinery Engin  2013, Vol. 31 Issue (6): 534-539    DOI: 10.3969/j.issn.1674-8530.2013.06.015
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Structural parameter design for variable regulatorsinprecision irrigation sprinklers
(1.College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China; 2.Institute of Soil and Water Conservation, CAS&MWR, Yangling, Shaanxi 712100, China)
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Abstract In order to simultaneously control the spray field and volume of sprinklers in accordance with various shapes of irrigation area, a variable regulator design for precision irrigation sprinklers is proposed. The variable regulator was constructed with upper and lower waterblocking pieces, each of which comprises a central throughhole as well as fanshaped throughholes and fanshaped waterblocking pieces. As the sprinkler rotates, the upper and lower waterblocking pieces rotate in opposite directions. In conducting, both the watercarrying area and spray range increase; when it is closed, both the watercarrying area and spray range decrease. In this study, the structural parameters, including the central angle of the fanshaped and central throughholes for minimizing the sprinkler energy loss, were designed; based on the local resistance theory of water movement, the central throughhole diameters for the upper and lower waterblocking pieces were also designed. The results show that the variable regulator designed in this study can guarantee the minimal resistance loss at watercarrying cross section; through spray range and watercarrying area testing, it is found that the contours of sprayed areas has transformed from circles to approximately squares, with the largest range approaching closely the original nozzle range and the water distribution being even, which can meet the demand of controlling spray flow and spray range as they vary and realize variablerate precision irrigation.
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Articles by authors
HAN Wen-Ting
ZHOU Long
WU Pu-Te
LIU Wen-Shuai
LI Xing-Shu
CUI Li-Hua
Key wordssprinkler   precision irrigation   variable spraying   local resistance   structure design     
Received: 2013-01-05; Published: 2013-06-25
Cite this article:   
HAN Wen-Ting,ZHOU Long,WU Pu-Te et al. Structural parameter design for variable regulatorsinprecision irrigation sprinklers[J]. Journal of Drainage and Irrigation Machinery Engin, 2013, 31(6): 534-539.
 
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