| 引用本文: | 胡贵荣,李诗莹,金嫣婧,等.扩散段位置对非对称文丘里施肥器吸肥性能及水力性能的影响[J].灌溉排水学报,0,():-. |
| Hu Guirong,LI Shiying,Jin Yanjing,et al.扩散段位置对非对称文丘里施肥器吸肥性能及水力性能的影响[J].灌溉排水学报,0,():-. |
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| 摘要: |
| 【目的】为了提高非对称文丘里施肥器吸肥性能，探明吸肥性能、水力性能对扩散段位置的响应关系。【方法】设计了5种不同扩散段位置的非对称文丘里施肥器，分别对其进行吸肥性能试验与数值仿真，对比分析了其吸肥量、临界吸肥压差、进水口临界吸肥压力。【结果】非对称文丘里施肥器在正常工作阶段，吸肥量与进口压力呈现良好的线性关系，临界吸肥压差和进水口临界吸肥压力均随着出水口压力的增大而增大。与非对称文丘里施肥器原型(F1)相比，将扩散段设置为偏心向下的非对称文丘里施肥器(F5)的吸肥流量和吸肥效率分别提升13.03%~40.16%和12.09%~39.13%，随着进口压力值增大，增幅逐渐降低。当进出口压差在0.15 MPa左右，吸肥流量达到最大值，与其F1相比，F5的最大吸肥流量提升13.03%，临界压差降低7.69%。【结论】正常工作时，降低出水口压力，有利于降低进水口吸肥临界压力；将扩散段向着远离吸肥管一侧移动，有利于降低局部水头损失，提高喉部负压利用效率，提升极限工况下吸肥流量，降低吸肥临界压差，提升文丘里施肥器整体工作性能。研究可为研发新型文丘里施肥器提供理论参考。 |
| 关键词: 文丘里施肥器；扩散结构；吸肥性能；吸肥流量 |
| DOI： |
| 分类号:S224.21 |
| 基金项目:兵团重大科技项目(2021AA003)；兵团南疆重点产业创新发展支撑计划项目(202DB004)；兵团重点领域创新团队项目(2019CB004)；石河子大学创新发展专项(CXFZ201905)。 |
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| Effects of Diffusion Section Position on Fertilizer Absorption Performance and Hydraulic Performance of Non-asymmetric Venturi Injector |
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Hu Guirong1,2, LI Shiying1,3,3,2, Jin Yanjing1,2, Cao Yuan1,2, Wang Zhenhua1,2, Liu Ningning1,2
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1.College of Water Conservancy &2.Architectural Engineering, Shihezi University;3.amp
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| Abstract: |
| 【Objective】In order to improve the fertilizer absorption performance of asymmetric Venturi injector, the response of fertilizer absorption performance and hydraulic performance to the position of diffusion section was explored.【Method】Five kinds of non-asymmetric Venturi injectors with different diffusion sections were designed, and their fertilizer absorption performance test and numerical simulation were carried out respectively. The fertilizer absorption flow, critical fertilizer absorption pressure difference and critical fertilizer absorption pressure at inlet were compared and analyzed.【Results】In the normal working stage of non-asymmetric Venturi injector, the fertilizer absorption flow showed a good linear relationship with the inlet pressure. When the inlet and outlet pressure difference was about 0.15 MPa, the fertilizer absorption flow reached the maximum. The critical pressure difference and inlet critical pressure increase with the increase of outlet pressure. Compared with the original of non-asymmetric Venturi injector (F1), the fertilizer absorption flow and efficiency of non-asymmetric Venturi injector with eccentric downward diffusion section (F5) were increased by 13.03%?40.16% and 12.09%?39.13%, respectively. With the increase of inlet pressure, the increase gradually decreased. Compared with F1, The maximum fertilizer absorption flow of F5 increased by 13.03%, and the critical pressure difference of F5 decreased by 7.69%.【Conclusion】When working normally, reducing the outlet pressure is beneficial to reduce the critical pressure of fertilizer absorption. Moving the diffusion section away from the side of the fertilizer suction pipe is conducive to reducing the local head loss, improving the negative pressure utilization efficiency of the throat, increasing the flow rate of fertilizer suction under extreme conditions, reducing the critical pressure difference of fertilizer absorption, and improving the overall working performance of Venturi injector. The study can provide theoretical reference for the development of new Venturi injector. |
| Key words: Venturi injector; Diffusion structure; Fertilizer absorption performance; Fertilizer absorption flow |
