Research on Numerical Simulation and Structural Optimization of Dual-Throat Venturi Fertilizer Injectors

School of Hydraulic Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China

^* Corresponding author: lidf@zjweu.edu.cn

Abstract

Fertilization equipment is a crucial component of irrigation systems, and its performance directly impacts irrigation quality. To address the issues of low suction flow and excessive head loss in existing Venturi fertilizer injectors, the team employed numerical simulation techniques. Through single-factor experiments, we analyzed the effect of the suction pipe angle of the dual-throat Venturi fertilizer injector on its suction performance, ultimately determining the optimal structural parameter combination for the injector. The study utilized software such as Tecplot and CFD to analyze the influence of various structural parameters on the internal pressure, turbulent kinetic energy, and vortex distribution within the dual-throat Venturi fertilizer injector, examining the patterns of internal flow field variations. The angle of the suction pipe significantly affects suction performance; adjusting the suction pipe to the optimal angle helps reduce turbulent kinetic energy at the throat, increase negative pressure, and decrease both the area and intensity of vortices. This, in turn, minimizes the intensity of multidirectional velocity collisions and the head loss caused by vortices, leading to a substantial enhancement in both suction and hydraulic performance.