基于正交试验的迷宫流道灌水器参数化设计研究

Parameterized Design of Labyrinth-Channel Emitters Based on Orthogonal Experiments

采用正交试验设计方法,取三角形迷宫流道灌水器的关键参数为因素,利用光固化快速成形技术制作出各参数组合的灌水器与外管一体化结构原型,并进行了灌水器水力性能的试验研究.流量和流态指数的极差和方差分析结果均显示出流道转角对流态指数的影响最显著,而流道单元数对灌水器流量的影响最大,这一结果有助于解决流道经优化后带来的流量增大问题.应用多元线性回归法拟合出灌水器流量系数和流态指数与参数的关系式,进而得到了流量与压力的回归方程.验证试验结果表明,回归方程能较好地预测迷宫流道灌水器流量与压力的关系,从而实现了灌水器参数化的结构设计.

Stereolithography technology is adopted to fabricate the integral structure of emitters and outer pipes, and the experiments of emitter hydraulic performance are carried out with orthogonal design method, where the key parameters of triangle channel are distinguished. The resuits obtained from range analysis and variance analysis show that the channel turning angle is the most important factor affecting the flow index, and the flow rate is seriously influenced by the number of channel units, which facilitates settling the problem of increscent flow rate due to the structural optimization. A model is established between structural parameters and hydrodynamic behaviors according to the linear multivariable regression method, which is verified being able to forecast the relationship between the flow rate and pressure loss for the emitters with triangle labyrinth channels.