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Numerical calculation of triangle circulation drip irrigation emitters based on orthogonal experiment |
Wang Xinkun, Li Junhong, Li Yafei, Xu Wenbo |
(Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, Jiangsu 212013, China) |
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Abstract To overcome the condition that emitter structures of only one single status currently, a new type of triangle circulation drip irrigation emitter was constructed. Computational fluid dynamics software Fluent 6.3 was adopted to simulate the flow of emitters, and the experiments of emitter hydraulic performance were carried out with orthogonal design method, where the key parameters of triangle circulation channel were distinguished. The impact of key structural parameters on flow index and flow rate was analysed using range analysis and variance analysis. The results show that the channel width b is the most important factor affecting the flow index x. The role of channel depth D, inlet size a and unit height h on x can be ignored. The flow rate is seriously influenced by the channel depth D, channel width b, inlet size a and unit height h, impact is decreasing. According to the linear multivariable regression method, models of flow index and flow rate with structural parameters was established. The linear multivariable regressions provide a theoretical basis for the triangle circulation emitters structure design and quantitative analysis.
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Received: 07 July 2009
Published: 30 September 2010
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[1]Wei Qingsong,Shi Yusheng,Dong Wenchu,et al.Study on hydraulic performance of drip emitters by computational fluid dynamics[J].Agricultural Water Management,2006,84(1/2):130-136.[2]Barragan J,Bralts V,Wu I P.Assessment of emission uniformity for micro-irrigation design[J].Biosystems Engineering,2006,93(1):89-97.[3]王建东,李光永.齿形迷宫流道结构参数对滴头水力性能影响的试验研究[C]//第六次全国微灌大会论文集.2004:246-252.[4]Wei Qingsong,Lu Gang,Liu Jie,et al.Evaluations of emitter clogging in drip irrigation by two-phase flow simulations and laboratory experiments[J].Computers and Electronics in Agriculture,2008,63(2):294-303.[5]王新坤,李亚飞.单翼迷宫灌水器进口流场数值模拟与结构优化[J].排灌机械,2009,27(1):60-63.Wang Xinkun,Li Yafei.Numerical calculation and structural optimization for inlet flow field of single wing labyrinth drip irrigation emitter[J].Drainage and Irrigation Machinery,2009,27(1):60-63.(in Chinese)[6]闫大壮,杨培岭,任树梅.滴头流道中颗粒物质运移动态分析与CFD模拟[J].农业机械学报,2007,38(6):71-74.Yan Dazhuang,Yang Peiling,Ren Shumei.Study on dynamic analysis of particle movement in drip emitter based on CFD[J].Transactions of the Chinese Society for Agricultural Machinery,2007,38(6):71-74.(in Chinese)[7]袁建平,李淑娟,付跃登,等.用正交试验研究分流叶片对离心泵性能的影响[J].排灌机械,2009,27(5):306-309.Yuan Jianping,Li Shujuan,Fu Yuedeng,et al.Splitter blades′ effect on characteristics of centrifugal pump by orthogonal experiment[J].Drainage and Irrigation Machinery,2009,27(5):306-309.(in Chinese)[8]张俊,洪军,赵万华,等.基于正交试验的迷宫流道灌水器参数化设计研究[J].西安交通大学学报,2006,40(1):31-35.Zhang Jun,Hong Jun,Zhao Wanhua,et al.Parameteri-zed disign of labyrinth-channel emitters based on ortho-gonal experiments[J].Journal of Xi′an Jiaotong University,2006,40(1):31-35.(in Chinese) |
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