Structure Design and Optimization of Fertilizer Injection Nozzle Based on ANSYS

基於ANSYS的注肥噴嘴結構設計與優化

MEI ZHU ； JIALIN GU ； XIAOLE LI ； HUI LUO ； JIE XU

《台灣水利》 70卷1期 (2022/03) Pp. 66-78

https://doi.org/10.6937/TWC.202203_70(1).0006

摘要

In order to improve the mixing uniformity of fertilizer solution and irrigation water, the structure of fertilizer injection nozzle was optimized by CFD numerical simulation method. The mixing effect of the optimized fertilizer injection nozzle was verified by a comparative experiment. Based on the number and location of orifices, four numerical models of fertilizer injection nozzles were established. RNG k-ε turbulence model and component transport model were used to predict the effect of fertilizer solution mixing. According to the prediction results, the number and layout of orifices of fertilizer injection nozzle were optimized. The optimized fertilizer injection nozzle structure was simulated and analyzed. The material object of the fertilizer injection nozzle was made to validate the results. In the comparative experiment, the fertilizer injection nozzle was installed as the experimental group, and the traditional non-nozzle was used as the control group. The results showed that the concentration of fertilizer solution in the branch pipe decreases when the distance between the branch pipe and the fertilizer injection port increases. Compared with the highest value, the lowest value of conductivity of fertilizer solution in each branch pipe of the experimental group only decreased by 21%, which was significantly less than the 73.1% of the control group. The verification test showed that the optimized structure of fertilizer injection nozzle effectively improves the mixing uniformity of fertilizer solution and irrigation water, and effectively reduces the difference of fertilizer solution concentration in each branch pipe. This study provides a design method and a reference scheme for the research on the mixing uniformity of fertilizer solution and irrigation water in the irrigation pipe of the water fertilizer integrated machine.

關鍵字

Integration of water and fertilizer ； Fertilizer injection nozzle ； ANSYS ； Numerical simulation

並列摘要

為了提高水肥一體化機肥料溶液與灌溉水混合均勻性，采用CFD數值模擬方法優化注肥噴嘴結構，利用對比實驗驗證優化後注肥噴嘴的混肥效果。基于孔口數量、孔口位置不同建立了4種注肥噴嘴數值模型，采用RNG k-ε湍流模型與組分輸運模型進行肥液混合效果預測。根據預測結果對注肥噴嘴的孔口數量與布置方式進行優化，對優化結構進行仿真分析並制作實物。利用優化結構的注肥噴嘴實物開展注肥效果對比驗證試驗，試驗中安裝注肥噴嘴作為試驗組，傳統無噴嘴為對照組。試驗結果表明，試驗組與對照組中支管內肥料溶液濃度都會隨支管與注肥口之間距離增加而逐漸降低；試驗組各支管內肥料溶液電導率最低值與最高值相比僅下降約21％，明顯小於對照組的73.1％。驗證試驗證明，優化後的注肥噴嘴結構有效提高了肥料溶液與灌溉水混合均勻性，有效降低了各支管內肥液濃度的差異性。本研究為水肥一體化機灌溉管道中肥液與灌溉水混合均勻性研究工作提供了設計方法和參考方案。

並列關鍵字

水肥一體化 ； 注肥噴嘴 ； ANSYS ； 數值仿真

參考文獻

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