摘要
用Pro/E软件建立喷头内流道的三维实体模型,选择RNGk-ε模型在CFD软件Fluent中模拟了雨鸟30PSH型摇臂式喷头在10种入口压力和4种主喷嘴直径组合下的内流道流场,分析了喷头主副喷嘴的流量、入口压力与出口平均速度等参数的关系。研究结果表明:主喷嘴直径增大时,副喷嘴流量几乎不变;主、副喷嘴的流量分配比例由主喷嘴直径决定,与入口压力无关。入口压力增大,主喷嘴出口平均速度增大,但副喷嘴出口平均速度不变。喷头主、副喷嘴的平均湍动能随入口压力增大而增大,不受主喷嘴直径变化的影响。主喷嘴出口静压力、湍动能和速度的标准差、副喷嘴出口静压力标准差与入口压力近似成正比;而副喷嘴出口湍动能和速度的标准差随主喷嘴直径或入口压力增大产生较大的无规律变化。喷头内流道流场的可视化结果显示喷头副喷嘴与弯管连接处静压力较大,接近喷头入口静压力。
The geometric model of internal runner was constructed in Pro/E software.The internal flow field of the Rain Bird 30PSH impact sprinkler was conducted by using computational fluid dynamics（CFD） software Fluent with RNG k-ε model at ten different pressure values and four types of range nozzle.Relationship between flow rate,inlet pressure and average velocity of outlet of range and spreader nozzle were evaluated.The results showed the flow rate of spreader nozzle was almost the same regardless of shifting the diameter of range nozzle.The distribution between range and spreader nozzle depended on the diameter of range nozzle was independent with inlet pressure.The average velocity magnitude of the range nozzle increased with the increasing of inlet pressure but spreader nozzle would not.The turbulent kinetic energy of range and spreader increased with the increasing of inlet pressure was independent with nozzle size.The standard deviation of static pressure,turbulent kinetic energy,velocity of range nozzle and static pressure of spreader nozzle were almost in direct proportion to inlet pressure.Biggish and irregular changing was happened to standard deviation of turbulent kinetic energy and velocity of spreader nozzle.Flow field visualization indicated that joint of runner and spreader nozzle had maximal static pressure.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2011年第8期58-64,共7页
Transactions of the Chinese Society for Agricultural Machinery
基金
国家自然科学基金资助项目(51079140)
西北农林科技大学基本科研业务费资助项目(Z109021008)
关键词
喷头
流场
计算流体动力学
数值模拟
Sprinkler
Flow field
Computational fluid dynamics
Numerical simulation
