| 引用本文: | 李杰,李俊龙,张以升.定常振荡流施肥模式对灌溉管道混合均匀性的影响[J].灌溉排水学报,0,():-. |
| LI Jie,Li Junlong,Zhang Yisheng.定常振荡流施肥模式对灌溉管道混合均匀性的影响[J].灌溉排水学报,0,():-. |
|
| 摘要: |
| 【目的】探究柱塞泵提供的定常振荡注肥模式对灌溉管网首部主干管道水肥混合均匀性的影响，寻求不同运行工况下分干管安全布设距离。【方法】采用室内试验与数值仿真相结合的方法，研究相同工况下管道内肥液质量分数，利用数值仿真方法探究不同温度、管径、主管流量以及注肥比下水肥混合均匀性。【结果】室内试验与数值仿真所得出的水肥混合均匀性相吻合，随着流程的增加混合均匀性逐渐增大。其他工况相同时，当主管管径从63 mm增大到110 mm，有效混合距离平均增加了0.769 m；温度从10 ℃增加到30 ℃时，不同主管流量下有效混合距离平均下降了0.499 m和1.681 mm；主管流量从6 m3/h增加到8 m3/h时，不同管径下的有效混合距离平均增加了1.598、1.064、1.132 m；注肥比从2%增加到4%时，不同管径下的有效混合距离平均减少了0.534、0.824、0.826 m。【结论】水肥混合均匀所需的有效混合距离随管径与主管流量的增加而增加，随温度与注肥比的增加而减少；采用63、90、110 mm的灌溉主管，分干管的开口位置应距注肥口5~5.5 m处。 |
| 关键词: 水肥一体化；数值模拟；多相流；注肥三通管；定常振荡流 |
| DOI： |
| 分类号:A |
| 基金项目:(黑体,六号):河南省科技攻关项目(212102110036) |
|
| Effects of Unsteady Fow Fertilization on Mixing Uniformity of Irrigation Pipes |
|
LI Jie, Li Junlong, Zhang Yisheng
|
|
School of Water Conservancy and Civil Engineering, Zhengzhou University.
|
| Abstract: |
| 【Objective】To explore the influence of the constant oscillating fertilizer injection flow provided by the plunger pump on the uniformity of water and fertilizer mixing in the head main pipe of the irrigation network, and to seek the safe distance of the branch main pipe.【Method】Combining laboratory test with numerical simulation to study the concentration of fertilizer solution in the pipeline under the same working condition, and the test value is compared with the numerical simulation value to analyze the accuracy of simulation. On the premise of high accuracy of numerical simulation, the method of numerical simulation is used to explore the uniformity of water and fertilizer mixing under different pipe diameters, temperatures, main pipe flow and fertilizer injection ratio.【Result】The homogeneity of water-fertilizer mixing obtained from laboratory test and numerical simulation is in consistent, and the homogeneity of water-fertilizer mixing gradually increases with the increase of the mixing distance.When other conditions are the same, the effective mixing distance increases by 0.769 m on average when the diameter of main pipe increases from 63 mm to 110 mm.As the main flow increases from 6 m3/h to 8 m3/h, the effective mixing distance under different pipe diameters increases by 1.598 m, 1.064 m and 1.132 m on average. While the ratio of fertilizer injection increases from 2% to 4%, the effective mixing distance under different pipe diameters decreases by 0.534 m, 0.824 m and 0.826 m on average. The effective mixing distance decreases by an average of 0.499 m and 1.681 m at different main flow rates when the temperature is increased from 10℃ to 30 ℃.【Conclusion】 The effective mixing distance required for uniform mixing of water and fertilizer increases with the increase of pipe diameter and main flow, but decreases with the increase of temperature and fertilizer injection ratio. Pipe diameter and main flow are the main factors affecting effective mixing distance. The opening position of branch pipe of irrigation main pipe with 63 mm, 90 mm, 110 mm pipe diameter should be 5~5.5 m away from the fertilizer injection pipe. |
| Key words: Water and fertilizer integration; Numerical simulation; Multiphase flow; Fertilizer injection tee pipe; Steady oscillating flow |
