Effects of seeds morphology on pressure distribution in the cone hole of air-blowing seed-metering device based on CFD

Abstract.

In this study, a pneumatic seed-metering device was characterized experimentally and modelled by means of 3D-CFD simulations. The gas motion was simulated by the closed equations which were consisted of continuous averaging Reynolds equation, Navier-Stokes equation and standard k-ε two-equation turbulence model and the three-dimensional, incompressible, viscosity, RNG turbulent flow model with SIMPLEC numerical calculation method were used. The software FLUENT of CFD was used to simulate the internal flow field of cone hole with different maiz positions. The pressure and velocity values were accepted and data analyzed through detecting the points near the walls all directions in the cone hole under certain working conditions, combined with the distribution of pressure field, velocity field and flow trajectories in the cone hole of metering device to clarify the influence of different positions of maiz particles on the pressure and velocity distribution in the cone hole. The following conclusions have been drawn from the results of single factor analysis of variance of the effect of seed morphology on the differential pressure, the influence of seeds of different morphology in the hole on the differential pressure of the front side is not significant, the effect on the differential pressure of the rear side is generally significant, the effect on the differential pressure of the left and right side is highly significant.