分形流道设计及几何参数对滴头水力性能的影响

在迷宫流道设计中引入分形理论，借助分形理论描述复杂现象的能力来构造不同复杂程度的分形体，利用分形曲线构造比欧氏几何更为复杂的流道边界。试验结果表明分形流道较迷宫式流道更能降低滴头的流态指数。采用通径分析结果表明，流道横断面面积、流道长度是影响滴头流量系数的主要因素，而其他因素影响较小；利用支持矢量机(Support vector machine, SVM)回归分析建立的流量系数与流道面积、长度的关系模型达极显著相关水平。分形流道的流态指数与流道几何参数变化不敏感，真正实现了全紊流滴头的设计，为滴头流道设计提供了一种新的思路与方法。

EFFECTS OF FRACTAL FLOW PATH DESIGNING AND ITS PARAMETERS ON EMITTER HYDRAULIC PERFORMANCE

Make use of the function of fractal geometry for constructing the anomalous bodies,which is introduced into the design of flow path.The fractal curves are used to form the flow path of drip irrigation emitter more complex than labyrinth,and the full design ideas of fractal flow path are pointed out.The results of experiment indicate that the emitter exponent of fractal flow path are lower than labyrinth emitters.The path analysis results show that the section area and length of the flow path are the main factor affecting on the flux coefficient of drip irrigation emitter,and other ones less.The relativity among flux coefficient,section area and length of the flow path could come to the level of salience.The exponent of emitter is inde-pendent with the parameters of the flow path,and the design of full turbulent emitter had been realized indeed.Based on this,a new method for design of flow path is pointed out.