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<p>The structural design and operational parameters of Venturi injectors are decisive factors influencing their fertilizer injection performance (FIP) and hydraulic performance (HP). Effective optimization of these elements can lead to substantial improvements in both performance indicators. This study introduces three novel dual-channel Venturi injectors (DCVIs), designated as DA, DB, and DC, each featuring distinct structural configurations in terms of the fusion of contraction-diffusion sections and the number of fertilizer inlets. We performed numerical simulations with the standard <i>k</i>-<i>ε</i> turbulence model and the Zwart-Gerber-Belamri (ZGB) cavitation model. The reliability of the models was confirmed by a deviation of less than 10% between the simulated and measured fertilizer injection flow rates. This research systematically investigates the effects of structural design and key parameters, including the contraction angle (<i>α</i>), diffusion angle (<i>β</i>), and throat diameter (<i>d</i>), on FIP. Moreover, a comparative analysis of FIP and HP was conducted between the optimized DCVI and both a symmetrical Venturi injector (SVI) and an asymmetrical Venturi injector (AVI). Under identical operating conditions, the fertilizer injection flow rate (<i>q</i>) and fertilizer injection efficiency (<i>η</i>) of the three DCVIs followed the order DC &gt; DB &gt; DA. The DC configuration, with its separated contraction-diffusion sections and dual inlets, was associated with the highest FIP, suggesting potential benefits in flow stability and injection area. For the DC-based injector, <i>η</i> showed a non-monotonic relationship with the structural parameters, initially increasing and then decreasing beyond optimal values of <i>α</i>, <i>β</i>, and <i>d</i>. The combination of <i>α</i> = 40°, <i>β</i> = 6°, and <i>d</i> = 5&#xa0;mm was identified as the optimal set of parameters for maximizing <i>η</i>. In comparison to the SVI and AVI, the DCVI increased <i>q</i> by 76.19–249.69% and 23.62–138.34%, respectively, while reducing the head loss ratio by 14.29–53.61% and 8.25–39.59%. These findings affirm the significant energy-saving characteristics of the DCVI, thereby reducing the operational costs of fertigation systems. This study offers practical insights for implementing integrated fertigation systems within sustainable agricultural frameworks.</p>

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Structural characteristics optimization and working performance test of dual-channel Venturi injector

  • 期刊论文

  • 发表日期：

    2025年12月3日

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  • Chenyu Zhao,
  • Guirong Hu,
  • Ningning Liu,
  • Jinzhu Zhang,
  • Miao Li,
  • Zhenhua Wang

摘要

The structural design and operational parameters of Venturi injectors are decisive factors influencing their fertilizer injection performance (FIP) and hydraulic performance (HP). Effective optimization of these elements can lead to substantial improvements in both performance indicators. This study introduces three novel dual-channel Venturi injectors (DCVIs), designated as DA, DB, and DC, each featuring distinct structural configurations in terms of the fusion of contraction-diffusion sections and the number of fertilizer inlets. We performed numerical simulations with the standard k-ε turbulence model and the Zwart-Gerber-Belamri (ZGB) cavitation model. The reliability of the models was confirmed by a deviation of less than 10% between the simulated and measured fertilizer injection flow rates. This research systematically investigates the effects of structural design and key parameters, including the contraction angle (α), diffusion angle (β), and throat diameter (d), on FIP. Moreover, a comparative analysis of FIP and HP was conducted between the optimized DCVI and both a symmetrical Venturi injector (SVI) and an asymmetrical Venturi injector (AVI). Under identical operating conditions, the fertilizer injection flow rate (q) and fertilizer injection efficiency (η) of the three DCVIs followed the order DC > DB > DA. The DC configuration, with its separated contraction-diffusion sections and dual inlets, was associated with the highest FIP, suggesting potential benefits in flow stability and injection area. For the DC-based injector, η showed a non-monotonic relationship with the structural parameters, initially increasing and then decreasing beyond optimal values of α, β, and d. The combination of α = 40°, β = 6°, and d = 5 mm was identified as the optimal set of parameters for maximizing η. In comparison to the SVI and AVI, the DCVI increased q by 76.19–249.69% and 23.62–138.34%, respectively, while reducing the head loss ratio by 14.29–53.61% and 8.25–39.59%. These findings affirm the significant energy-saving characteristics of the DCVI, thereby reducing the operational costs of fertigation systems. This study offers practical insights for implementing integrated fertigation systems within sustainable agricultural frameworks.