Numerical simulations of internal flow fields in a nozzle with liquid fertilizer deep machinery

Abstract

Fertilizing with water jet is a non-contact fertilization technique that uses high pressure water jet for hole-caving and fertilizing. In this article, an automatic liquid fertilizer deep machinery is proposed. The influences of three typical nozzles on the liquid fertilizer deep machinery were investigated via numerical simulations. The feasible water jet nozzle structures were obtained based on analysis and optimization of the main flaws of the four nozzles. A three-dimensional mathematical model of internal flow field in a high-pressure nozzle was established using the ANSYS software. Using the standard k-ε turbulent model, the internal flow field in the nozzle was simulated and the influences of nozzle parameters on the flow rate isogram and axial flow rate at the outlet of the flow field were studied. The results revealed that the axial flow rate at the outlet increased and then decreased as the convergence angle increased. The effects of cylinder section length on the axial flow rate at the outlet were negligible within a certain range. As the outlet diameter increased, the axial flow rate at the outlet decreased.