摘要
文丘里施肥器以其结构简单、操作方便、无需动力等优点而被广泛应用,现今国内产品大多仿照国外制造,由于方法、技术等原因,其性能不是很理想。该文采用计算流体动力学(CFD)的数值计算方法,通过各结构参数(喉管直径、收缩段长度、凹槽直径、凹槽位置)对性能影响的单因素、二因素和全因素的数值模拟研究,得到文丘里施肥器结构参数与性能之间的影响关系以及性能优化的结构参数。研究结果表明:在进口压力和凹槽位置一定的情况下,减小喉管直径和收缩段长度以及增加凹槽直径均能使文丘里施肥器的吸肥量增加;在其他结构参数不变的条件下,随着凹槽右移数值的增加,吸肥量减小;随着进口压力的增加,吸肥量增大。该研究结果可为国内文丘里施肥器的优化设计与研制提供一定的理论依据。
Venturi Injector is widely used in micro-irrigation system due to its simple structure, easy operation, and needless of electric power. Now most of the Venturi Injector production are copied from abroad ones, and their hydraulic parameters such as suction amount are not very desirable due to the low level of processing methods and technology. In this paper, CFD（Computational Fluid Dynamics） was used to simulate the inner flow field of the Venturi Injector with one factor, two factors and three factors experiment design. The relationships between the structure parameters （i. e. , throat length, throat diameter, slot diameter, slot position） and suction amount, and the optimal structure parameters of Venturi Injector were analyzed. Results show that when the inlet pressure and the slot position keep unchanged, the suction amount of Venturi Injector increases with the decrease of throat diameter and length, and the increase of slot diameter; while keep the slot diameter, throat diameter and throat length unchanged, the suction amount of Venturi Injector increases with the increase of inlet pressure; When the slot position move to right, the suction amount and inlet pressure of Venturi Injector decrease. The results can provide theoretic support for dometic Venturi Injector research and development.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2006年第7期27-31,共5页
Transactions of the Chinese Society of Agricultural Engineering
基金
农业科技成果转化资金项目(04EFN216800348)
农业部重点实验室开放基金项目
关键词
文丘里施肥器
吸肥量
结构参数
数值模拟
Venturi Injector
suction amount
structure parameter
numerical simulation
