Modeling the aerodynamic processes of a double-drum header of a stripping type

Abstract

When developing reapers for harvesting crops by combing plants on the vine, an important task is the selection and justification of structural-operational parameters. Conducted theoretical studies have established the influence of the structural and technological parameters of the stripping type header on the quality of the process in its area when harvesting oil flax by direct combining. It is proved that the air flow generated during the operation of the reflector beater and the combing drum of the header has a significant effect on the process. The air flow was studied using the STAR-CCM + software package, which is implemented on the basis of the finite element method. In this case, adaptive regular computational grids with a variable cell size were used. The base cell size was taken to be 0.001 m. A prismatic layer generator, a polyhedral cell generator, and a surface mesh generator were chosen as the mesh model. By numerical modeling of aerodynamic processes in a stripping type header, the distribution of air flow rates in its area is established, the dependences of the maximum air flow rate on the rotational speed of the beater-reflector and stripping drum, the position of the air mesh and the shape of the casing are approximated, for which rational structural and technological parameters of the header are obtained causing an improvement in the quality of the process. Based on the results of theoretical studies, the possibility of directional regulation of processes in the field of harvesting type reapers by substantiating their rational parameters for creating effective technical means for harvesting crops was established.