农业机械学报2017，Vol.48Issue(3)：294-301,8.DOI:10.6041/j.issn.1000-1298.2017.03.037
不同动态水压模式下迷宫流道内颗粒物运动特性研究
Particles Movement Characteristics in Labyrinth Channel under Different Dynamic Water Pressure Modes
摘要
Abstract
The movements of tracer particles in a labyrinth channel were observed by using the PIV technique.The pressure was in dynamic modes with trigonometric function,triangular,step and rectangular waveforms.The trajectories,velocity of single particle as well as the overall flow field in the channel were analyzed to reveal the anti-clogging mechanism of dynamic water pressure.The results showed that when compared with constant water pressure,flow rates in the channel under trigonometric function,triangular,step and rectangular waveforms dynamic pressure modes were not decreased significantly.Therefore,effect of dynamic water pressure on water delivery capacity of drip irrigation system was not obvious.Among the different dynamic water pressure modes mentioned above,the trigonometric function type demonstrated the shortest particles residence time in the flow stagnation region.The deposition probability of particles was the lowest under this mode,indicating a better particles transport capacity in the channel.Fluctuation effect generated by the water under pressure of trigonometric function form produced effect on the low-speed swirl in the stagnation region,and aggravated the turbulence of flow in this region.The turbulent flow was enhanced and the ability to carry the particles retained or even deposited in the stagnation zone was improved.As a result,the particles were suspended from the bottom and returned back to the main flow path.The transport capacity of the flow got strengthened,and the anti-clogging performance of the channel was improved.Therefore,the trigonometric function waveform dynamic water pressure model can most effectively improve the anticlogging performance in the labyrinth channel.关键词
动态水压/迷宫流道/颗粒物/运动速度/运动轨迹Key words
dynamic water pressure/labyrinth channel/particles/velocity/trajectory分类
农业科技引用本文复制引用
郑超,吴普特,张林,朱德兰,赵笑,安伯达..不同动态水压模式下迷宫流道内颗粒物运动特性研究[J].农业机械学报,2017,48(3):294-301,8.基金项目
中国科学院西部之光人才培养计划项目、西北农林科技大学基本科研业务费专项资金项目(2014YB061)和“十二五”国家科技支撑计划项目(2015BAD22B01-02) （2014YB061）
