MODELING OF AERODYNAMICALLY RATIONAL SPRAYING DEVICEJournal: Agricultural Machines (Vol.46, No. -)
Publication Date: 2021-05-27
Authors : A. Pastushenko;
Page : 93-102
Keywords : spraying plants; sprayer; two-phase medium; boundary layer; flow channel;
The chemical method of plant protection is very common, as its advantages are biological and economic efficiency and a wide range of pesticides. Sprayers of various designs are used to treat plants with pesticides in agriculture. The problem of plant protection with chemicals is becoming increasingly important nowadays in agriculture. The state's agricultural production loses almost a third of the gross harvest in crop production from pests, diseases, and weeds. The existing chemical protection of crops needs to be developed and improved. This article raises the need of developing new analytical approaches to the design and implementation of spraying plants working bodies that meet modern technological requirements by improving the aerodynamic sprayer flow performance. The design of the spray can be considered perfect in aerodynamic terms if it shows the absence of boundary layer separation from the wall, or if the separation area is located as downstream as possible. To do this, the calculation determines the place of boundary layer separation from the wall based on the study of the working fluid two-phase environment and metabolic processes occurring in it, characteristics that significantly affect the formation and development of the boundary layer and its separation. This approach helps to reduce energy losses. Based on the study of existing analytical solutions that can be adapted to two-phase media in the channel of the working fluid atomizer movement model, in combination with the graph analytical method of constructing the channel surfaces. The paper established that the non-uniformity degree reduction of the velocity field in any section of the spraying device largely depends on the smooth transition from one section to another.
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Last modified: 2021-06-07 20:09:12