西安交通大学机械制造系统工程国家重点实验室,西安,710049
网络首发:2009-09-10,
纸质出版:2009
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曹蒙, 魏正英, 葛令行, 等. 滴头壁面形貌对微颗粒与壁面黏附特性的影响[J]. 西安交通大学学报, 2009,43(9):120-124.
Influence of Emitter's Channel Wall Topography on Particle-Wall Adhesion[J]. 2009, 43(9): 120-124.
为了研究在含沙滴灌条件下
灌水器迷宫流道内壁面形貌对灌水器内流动特性以及流道内颗粒-壁面黏附的影响
以详细分析灌水器的堵塞机理
对不同形貌的矩形流道进行了水力性能测试实验
并利用粒子图像测速(PIV)平台对灌水器流道内颗粒-壁面黏附进行可视化实验
结合计算流体动力学的方法对其流场进行了数值仿真计算.研究结果表明:壁面粗糙元(高度为流道水力直径的10%)使得流道的阻力系数显著增大
即在同一工作压力下灌水器的出口流量变小; 粗糙元改变了流道内沙粒浓度的分布
且粗糙元附近的沙粒速度较低
粒子与壁面碰撞后更容易黏附壁面
使得灌水器流道更容易堵塞.
Aiming at the influence of labyrinth channel wall topography on the flow behavior and adhesion between particles and channel wall under the condition of silt-content irrigation
the emitter channels of different wall topography are chosen
and the hydraulic performance tests and the visual experiments on particle-wall adhesion are conducted via particle image velocimetry(PIV). The computational fluid dynamics is utilized to numerically simulate the flow field. The results show that the higher the wall roughness(the value is 10% of the hydraulic diameter)
the greater the resistance coefficient will be. That is
under the same pressure
the smaller the outlet flow rate
the more easily the particle-wall adhesion occurs. Wall roughness affects particle concentration distribution
and the particle velocity near the roughness elements is low
resulting in emitter clogging.
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李治勤,陈刚,杨晓池.浑水引起迷宫灌水器物理堵塞因素实验研究 [J].西安理工大学学报,2006,22(4):395-398.
LI Zhiqin, CHEN Gang, YANG Xiaochi.Experimental study of physical clogging factor of labyrinth emitter caused by muddy water [J]. Journal of Xi'an University of Technology, 2006,22(4):395-398.
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李艳强,吴超,阳富强.微颗粒在表面粘附的力学模型[J].环境科学与技术,2008,31(1):8-11.
LI Yanqiang,WU Chao,YANG Fuqiang.Mechanical model of micro-particle on surface adhesion [J].Environmental Science Technology,2008,31(1):8-11.
HEINL E,BOHNET M.Calculation of particle-wall adhesion in horizontal gas-solids flow using CFD [J]. Powder Technology,2005,159:95-104.
基于正交试验的迷宫流道灌水器参数化设计研究.西安交通大学学报,2006,40(1):31-35.
粗糙元特征对风洞中大气表面层模拟的影响.西安交通大学学报,2009,43(3):87-91.
竖直矩形窄通道空气自然对流换热特性的实验研究.西安交通大学学报,2009,43(3): 10-13.
纳米流道内液体特性的分子动力学研究.西安交通大学学报,2008,42(1):9-12.
离心叶轮的速度系数对级性能的影响.西安交通大学学报,2008,42(7):807-810.
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