SUBSTANTIATION OF GEOMETRIC FORMS OF A TILLAGE KNIFE FOR INTRASOIL APPLICATION OF LIQUID MINERAL FERTILIZERS

Abstract

soil tillage knife for liquid mineral fertilizers (LFM). The results and
recommendations are necessary to determine the factors contributing to the
formation of a uniform liquid flow, in selecting of material and technological
methods for the production of this knife. The obtained results can be used for such
processes as film and coating extrusion, for obtaining air curtains, as well as in the
development of slot distributors. The purpose of the study was to find out the
geometry and parameters of the knife channels that form a wide and uniform liquid
sheet across the entire width of the knife slot nozzle during the movement under
soil layer. One of the modern tools of computational fluid dynamics (CFD),
Solidworks Flow Simulation® software was used for fluid flow simulations and
calculations. The scientific novelties are the substantiated limits of channel's
design parameters of the tillage knife for liquid mineral fertilizers. According to
the research results, has determined that the modified sample which the location of
the feed channel axis relative to the knife rear plane has changed (Ү05, at ϒ =
0.81), the sample with the conical (narrowed) feed channel (Ү06, when K = 0.02)
and the sample that the feed channel narrows towards the end of the channel by
cutting with combination of vertical planes (Ү07) are more effective among the
investigated models with knife width of w = 102 mm and has showed a sufficiently
high indices of liquid distribution uniformity at the outlet of the knife slot. The
parametric limits of knife slot height (for water) providing a uniform flow of liquid
from the slot has revealed, h = 0,9–0,12 mm