农业工程学报2011，Vol.27Issue(4)：136-140,5.DOI:10.3969/j.issn.1002-6819.2011.04.023
全射流喷头压力调节装置损失系数分析及试验
Experiments on loss coefficient of complete fluidic sprinkler pressure regulation device
摘要
Abstract
According to the shortage of resoarch work on pressure loss in pressure regulation device of complete fluidic sprinkler for variable irrigation, the pressure variation of system was analyzed by Bernoulli equation. Based on definition system characteristics the sprinkler changed when working. Thc loss pressure coefficient was put forward with the value that, plus of section area variable coefficient and shape coefficient and then minus axial clearance influence coefficient of the moving chips in relative motion. For the calculation, the maximum loss pressure coefficient value was 0.7414, the minimum value was 0.0204. Virtual instrument and LabVIEW software were adopt to measure the relationships between pressure value, the sprinkler running time, the working conditions of pressure regulation device. The results showed that when the flow rates decreased, the upstream pressure increased, and the downstream pressure decreased, the range of downstream pressure changed was larger relatively. With the flow rate decreased, the loss coefficient increased. The maximum loss coefficient value of pressure regulation device was 0.582, and the minimum value was 0.265. The study can provide a theoretical basis for the design of complete fluidic sprinkler pressure regulation device.关键词
压力调节/喷头/试验/压力损失系数/影响因素Key words
pressure regulation/ nozzles/ experiments/ pressure loss coefficient/ influencing factors分类
农业科技引用本文复制引用
刘俊萍,袁寿其,骆寅,汤跃,李红..全射流喷头压力调节装置损失系数分析及试验[J].农业工程学报,2011,27(4):136-140,5.基金项目
国家"863"高技术研究发展计划(2006AA100211、2011AA100506) （2006AA100211、2011AA100506）
江苏省研究生创新计划项目(CX09B_197Z) （CX09B_197Z）
