Authors

Abstract

In order to address the issue of low oxygen stress caused by crops in traditional facility agriculture, this paper designed and optimized a venturi aeration device to enhance the oxygen content in the rhizosphere of crops in facility orchards. With the assistance of Comsol software, visual analysis of the flow field was conducted using Computational Fluid Dynamics (CFD) technology, exploring the impact of throat deviation and air inlet positioning on the suction efficiency of the aerator. The results indicated that the eccentric venturi configuration significantly improved suction efficiency. Moreover, positioning the air inlet on the contracted side of the eccentric venturi throat increased suction efficiency by 12.7%. Analysis of flow field characteristics of various venturi aerator configurations identified key factors influencing suction capacity, including throat flow velocity, vortex morphology in the diffuser section, and distribution of turbulent energy within the aerator. To validate the accuracy of the numerical simulations, an oxygen absorption performance testing apparatus was constructed and simulation results were compared with experimental data. The analysis revealed an error range between the two results of 1.67% to 7.74%, confirming the reliability of the simulations. This study has provided a theoretical foundation and technical methodology for the structural design and optimization of venturi aerators.

Abstract in Chinese

为了解决传统设施农业中对作物造成的低氧胁迫问题，本文设计并优化了一种文丘里增氧装置，旨在提高设施果园作物根际的氧含量。借助Comsol软件，基于流体动力学（CFD）技术进行流场的可视化分析，并探究喉管的偏移程度及进气口的位置对增氧器的吸气效率的影响。研究结果表明，偏心文丘里配置能显著提升吸气效率。此外，将进气口设置在偏心文丘里管喉管的收缩端一侧，能够使吸气效率提高12.7%。通过分析文丘里增氧器不同构型的流场特性，得到影响吸气量的关键因素主要包括喉管处的流速、扩散段的漩涡形态及增氧器内部的湍流能量分布情况。为了验证数值模拟仿真的准确性，构建了一套吸氧性能测试装置，并将仿真结果与试验结果进行了对比，结果比较分析表明二者之间的误差范围介于1.67%至7.74%，验证了仿真结果的可靠性。该研究为文丘里增氧装置的结构设计与优化提供了理论依据和技术方法。