基于MATLAB与COMSOL联合仿真的梯形迷宫滴头流道优化  

Optimization of trapezoidal labyrinth emitter channel based on MATLAB and COMSOL co-simulation

作　　者：胡宇祥[1] 彭军志[1] 殷飞[1] 刘喜峰[1] 李娜[1] Hu Yuxiang;Peng Junzhi;Yin Fei;Liu Xifeng;Li Na(Jilin Agricultural Science and Technology University,Jilin 132101,China)

机构地区：[1]吉林农业科技学院,吉林132101

出　　处：《农业工程学报》2020年第22期158-164,共7页Transactions of the Chinese Society of Agricultural Engineering

基　　金：吉林省教育厅“十三五”科学研究规划项目(JJKH20180739KJ)。

摘　　要：传统的滴灌灌水器流道优化设计方法是通过正交试验设计,进行有限元分析,并配合试验验证,试验过程强度大、造价高。该研究将群智能优化算法与有限元分析相结合,联合MATLAB与COMSOL仿真软件对滴灌灌水器流道参数优化设计。首先,通过MATLAB读取梯形迷宫流道灌水器在COMSOL软件中的仿真计算结果后,传递给遗传算法,并以流态指数为优化目标,流道齿参差值、齿高、单元数、流道转角、齿间距为设计变量,求解出常压(100 kPa工作压力)下的灌水器流道参数。利用SPSS软件回归分析法,建立了5个变量与流态指数之间的多元线性回归数学模型。分析结果表明,5个变量对流态指数影响程度排序为齿参差值、齿高、单元数、流道转角、齿间距。进一步分析灌水器流道内水力特性可知,滴头流道内低流速区域流速达到0.1~1.2 m/s,过流面积占流道截面的75.1%,有堵塞风险,高流速区域流速达到2.8~3.8 m/s,中流速区域流速达到1.5~2.5 m/s,流道内压力沿流道长度呈线性变化。实物样机测试结果表明,滴头流量模拟计算值与实测值之间的平均误差为6.1%,优化结果精度高,可为梯形迷宫流道灌水器流道参数优化设计提供参考依据。Drip irrigation emitter which has the advantages of little evaporation loss,no surface runoff and almost no deep leakage,is the most important component in drip irrigation system.The conventional drip emitter channel was optimized by finite element analysis through orthogonal experimental design in combination with experimental verification.However,the disadvantage of it lies in high intensity and high cost of the experimental process.Moreover,the optimal results obtained by data analysis through orthogonal experimental design are only the combination of different levels of factors,so it is difficult to determine the law of data change.In this study,the swam intelligence algorism is combined with the finite element analysis to design the parameter optimization of drip irrigation emitter channels by means of MATLAB and COMSOL simulation software.Firstly,MATLAB was used to read the simulation results of the trapezoidal labyrinth emitter in COMSOL software,and the results were passed on to genetic algorithm.Secondly,the optimization was aimed at the flow parameters and viewing the angle of labyrinth,height of tooth,inter-tooth space,units number of labyrinth and tooth diversification index as design variables so as to solve the emitter channel parameters at normal pressure(100 kPa nominal working pressure).Using SPSS software regression analysis method,the multiple linear regression mathematical model between the five variables and the flow pattern index is established.The analysis results showed that the five variables in light of the incidence against the flow pattern index could be sorted as follows:tooth diversification index,tooth depth,units number of labyrinth,channel corner and tooth space.The standardized regression coefficient(beta)of the three parameters,namely,tooth diversification index,angle of labyrinth and inter-tooth space,was positive,which indicated that the flow pattern index can be increased by increasing them;the standardized regression coefficient(beta)of height of tooth and units number of la

关 键 词：优化 设计 滴灌灌水器 结构参数 COMSOL MATLAB 

分 类 号：S275.6[农业科学—农业水土工程]