Highlights•Air-suction seed-metering device with auxiliary seed-supporting mechanism.•
Interrelationship between seed flow characteristics and airflow.•DEM-CFD can simulate the …

The air-suction precision seed-metering device is prone to the instability of the seed
adsorption state, which arises from blockage of the suction hole and leads to uneven …

Highlights•A preliminary suction model was proposed for ellipsoidal seeds.•The seed filling
process of ellipsoidal seeds was analysed by CFD.•The pressure gradient at the seed …

Simulation of the gas-solid flow in an inside-filling air-blowing maize precision seed-
metering device was performed by means of a coupling approach of the discrete element …

In disturbance-assisted seed filling vacuum seed-metering devices, the suction hole causes
difficulty in quickly and stably sucking seeds when used for high-speed seeding and the …

Highlights•Factors affecting the suction force of high-sphericity seeds confirmed.•More
complete empirical formula of the suction force established.•New equipment for measuring …

This work aimed to improve the seeding quality of maize and to investigate the influence of
the seed drop tube on the seeding quality. The airflow-assisted seed-dropping device (the …

Highlights•The distribution characteristics of seeds was investigated by CFD-DEM coupled
method.•Seed motion and collision, seed residence time, and airflow field were studied.•The …

According to the present situation of the sowing effect of original inside-filling air-blowing
seed metering device for flat seeds is better than circles, the phenomenon of drag force …

A numerical study of gas-solid flow in seed feeding device of air-assisted centralized
metering system was carried out by means of Discrete Element Method (DEM) and …