涌泉灌双向流流道稳流器工作机理与水力性能分析  

Analysis of working mechanism and hydraulic performance of two-way flow channel stabilizer in bubbler irrigation emitter

作　　者：郭霖[1] 白丹[1] 王新端[1] 何靖[1] 

机构地区：[1]西安理工大学水利水电学院,陕西西安710048

出　　处：《排灌机械工程学报》2016年第3期270-276,共7页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51279156);高等学校博士学科点专项科研基金联合资助课题(20116118110010);陕西省农业科技攻关项目(2010K02-08)

摘　　要：为了研究双向流稳流器流道结构的水力特性,以其内部双向流形成装置和结构参数为研究对象,取流道结构参数八字形分水件张角α,V字形挡水件张角β、八字形分水件中部过水孔宽度d为因素安排试验方案,利用激光精雕技术制作稳流器样机进行水力试验,测得0.05~0.21MPa等9个不同压力对应的流量值,应用多元回归拟合其流态指数在0.476~0.501,其水力性能良好;同时采用水力学计算方法,计算当稳流器工作水头分别在5~15 m时,流道总局部损失系数为18.3~19.8,大约是1组传统流道形式局部损失系数的4~10倍,从水力学计算的角度表明双向流流道消能效果的优越性;采用Minitab软件的Gauss-Newton算法进行多元回归,迭代次数设为200次,建立流态指数与结构参数之间的回归方程,通过显著性检验和相关系数检验结论一致,均显示回归效果具有统计学意义,且各因子的系数均有意义,为其流道参数化设计、结构优化以及在农业工程中的研发与应用提供了理论依据.In order to study on the hydraulic performance of the structure of two-way flow channel sta- bilizer in bubbler irrigation emitter, the inner structure of the stabilizer is modelled with three geomet- rical parameters, namely the angle c~ between the two splayed baffles, the angle fl of V - shaped baf- fle, and the throat width of the two splayed baffles. The experimental models have been designed by changing those parameters. The experimental models are manufactured by laser engraving technology, and the flow rates are measured under nine pressures ranged in 0.05 - 0.21 MPa. The experimental results are fitted by muhivariable regression method, showing the models are subject to an excellent hy- draulic performance with a flow regime index from 0. 476 to 0. 501. Meanwhile, the minor hydraulic loss coefficients across the models are calculated. The coefficients are between 18.3 and 19.8, nearly 4- 10 times the minor loss coefficients across a traditional flow channel when the operating head is ranged from 5 to 15m, suggesting the designed stabilizers show an excellent energy dissipation behavior. The mathematical relationships between flow regime index and geometrical parameters are developed by using multivariable regression method with Gauss -Newton algorithm based on Minitab software in which the number of iterations is set to be 200. The results show that the regression is significant in statistics in both significance test and correlation coefficient test. The relationships provide a theoretical basis for parameterized design, structure optimization, development and application in agricultural engineering.

关 键 词：涌泉灌 双向流流道 稳流器 工作机理 水力性能 

分 类 号：S275.6[农业科学—农业水土工程]