摘要
以流道内旋涡区为研究对象,采用计算软件FLUENT,选用标准k-ε模型对4种流易下的矩形迷宫灌水器流场与旋涡区涡旋强度、压力变化等进行数值模拟分析,将计算结果使用TECPLOT以及AUTOCAD进行处理。结果表明,矩形迷宫灌水器内水流由较大流速的主流区与封闭的旋涡区组成,旋涡区一方面可以增强灌水器的消能效率与抗堵塞性能,另一方面由于零速区的存在易引起灌水器堵塞,流量变化对旋涡区流动没有影响;流量与旋涡区面积和涡旋强度呈正相关关系,同时旋涡中心点位置随着流量增大逐渐偏离灌水器壁面并向下游移动,所以在流道优化中应对公称流量下流道内旋涡区进行优化,旋涡区压力由边界向中心逐渐降低,在旋涡中心处降至最低,压力降低速度随着流量的增大而加快。
Plugging in drip irrigation emitters directly influences the efficiency of the system, and even makes the system scrapped. Plugging mainly starts from the area of vortex, so this paper uses the area of vortex as the research object. On the basis of the calculation software FLUENT and the model of k-ε,the flow in rectangular labyrinth, strength of vortex and pressure variation were analyzed,and treated by TECPLOT and AUTOCAD. The results show that. 1)The flow in rectangular labyrinth emitter is constituted by the main flow area with higher flow-rate and closed area of vortex;2)The area of vortex on one hand can enhance the efficiency and anti-clogging,on the other hand it can plug the emitter;3)The flow variation has no effect on the flow in the area of vortex. There is a positive correlation between flow area of the vortex and strength of vortex. The position of central point deviates the boundary and goes downstream as the flow increases. The maximum flow should be used in optimization of the area of vortex in channel. 4)The pressure in the vortex decreases from the boundary to the center of vortex and is the lowest in the center of the vortex. The rate of pressure drop speeds up with the increase of the flow.
出处
《太原理工大学学报》
CAS
北大核心
2015年第4期465-469,共5页
Journal of Taiyuan University of Technology
基金
国家自然科学基金项目:地面灌溉技术参数优化研究(51249002)
关键词
迷宫灌水器
流场
堵塞
旋涡
labyrinth emitter
flow field
plugging
vortex