基于正交试验的三角环流流道灌水器数值模拟

针对目前灌水器结构形式单一的现状,构造出一种新型的三角环流灌水器.利用Pro/E软件完成灌水器造型,运用Fluent 6.3对灌水器内部流场进行了数值模拟.以三角环流灌水器流道的关键结构参数为因素,以灌水器的流态指数和流量为试验指标,对灌水器进行了正交试验设计,并应用极差与方差分析法分析了流道关键结构参数对流态指数和流量的影响度.结果表明,三角环流灌水器的流态指数的值在0.5左右,水力性能良好;流道宽度对流态指数的影响最显著,而流道深度、进口尺寸和单元高度对流态指数没有显著影响;流道深度、宽度、进口尺寸和单元高度对灌水器流量均有显著影响,且影响程度递减.通过多元线性回归分析,建立了灌水器流量和流态指数与流道结构参数之间的回归模型,可为三角环流灌水器结构设计与量化分析提供理论依据.

Numerical calculation of triangle circulation drip irrigation emitters based on orthogonal experiment

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.