Abstract
The article presents the theoretical background, in particular, the developed mathematical models describing the technological processes of air-jet formation and the influence of the wind wheel on changes in the axial velocities of the air jet, as well as the range of the air jet by a fan installation with a pneumatic disk sprayer. Theoretical studies show that the smooth variation of the axial velocity air flow fan installations and prevent the transfer of the isothermal jet of the circular cross-section of the air flow into the annular, possibly with applications on disk atomizer additional fairing and, to reduce the impact of Pavlovskogo spray on the variation of the axial velocity of the air flow and range of the fan system must be applied wind wheel with the highest energy efficiency of the air flow.
Highlights
Cotton is the main and most valuable technical crop cultivated on the territory of the Republic of Uzbekistan [1, 2]
The moment developed by the wind wheel: MM = MMо ππ RRv3v ρρvv UU/ 2 (1)
Where: Rv is the radius of the propeller, m; ρv is air flow density, kg/m3, kg s2/m4; U is airflow rate, m/s
Summary
Cotton is the main and most valuable technical crop cultivated on the territory of the Republic of Uzbekistan [1, 2]. An important element in the complex of measures for growing high yields of agricultural crops, including cotton, is the chemical protection of plants from pests, diseases, and weeds, which can significantly reduce losses and avoid reducing the quality of agricultural products. For high-quality machine cleaning, a necessary condition is the artificial removal of cotton leaves by carrying out pre-harvest defoliation [3]. As timely and quality defoliation accelerates ripening and disclosure of boxes for 10-15 days, the productivity of cotton pickers 10...15%, increased output of machine collection of raw cotton to 90%, the growth of output of first-class fiber 4...5%, reduction of contamination of raw cotton in 1.5...2.0 times and humidity in 2...3 times [4]. Among the many known methods of treating plants with pesticides (pollination, spraying, fumigation, aerosols, etc.), the most effective in the economic, agrotechnical, and environmental aspects are spraying, through which about 75% of the work volume is performed [5,6,7,8].
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