采用能量平衡黏附理论的灌水器泥沙-壁面黏附特性研究  

Particle-Wall Adhesion Behavior in Labyrinth Emitter Obeying Energy Balanced Adhesion Theory

作　　者：刘霞[1] 魏正英[1] 王立朋[1] 唐一平[1] 

机构地区：[1]西安交通大学机械制造系统工程国家重点实验室,西安710049

出　　处：《西安交通大学学报》2011年第10期115-121,共7页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(50675172);国家"863规划"资助项目(2006AA100214-5);全国博士学位论文作者专项基金资助项目(200740)

摘　　要：为了从量化的角度评价灌水器的抗堵性能,从单个沙粒的角度,分析了其在滴灌灌水器迷宫流道内的行为,建立了基于能量平衡的颗粒黏附模型,并计算出黏附临界速度.通过粒子图像测速可视化试验与计算流体动力学数值模拟相结合的方法,对采用能量平衡的黏附理论模型进行了适用性验证.研究发现,当灌水器入口压力越大、颗粒粒径越大或者颗粒-壁面间的界面能越小时,颗粒越难与壁面发生黏附,因此灌水器的易堵塞位置与灌溉水中的颗粒粒径级配有关.Aiming at quantitatively analyzing the emitter anti-clogging performance, the clogging mechanism of the emitter is analyzed for the interaction perspective as single sand contacts with the emitter channel-wall, and an adhesion model based on energy balance is established. A critical velocity, for justifying particle-wall adhesion appearing, is extracted. Particle imaging velocity visualized experiments and computational fluid dynamic numerical simulations are carried out to verify the applicability of the adhesion model, and the results demonstrate that the particle is more difficult to adhere to the emitter channel wall in case of larger inlet pressure, larger particle diameter or smaller interface energy; and the particle distribution affects the emitter clogging position obviously.

关 键 词：灌水器 黏附 能量平衡 数值模拟 

分 类 号：S275.6[农业科学—农业水土工程]