RESEARCH ON THE INFLUENCE OF VENTURI AERATOR CONFIGURATION ON OXYGEN ABSORPTION PERFORMANCE

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.