Experimental study of the time of pressure rise and fall in the sprayer pipe

Abstract

A wide variety of meteorological factors, soil and climatic conditions, the saturation of fields with many types of weeds, a significant set of cultivated plants and many other factors necessitate the implementation of innovative technological schemes for the use of pesticides, which will reduce the pesticide load as much as possible and determine the safe environmental effect of preparations. Experimental studies were carried out to determine the time of pressure rise and fall in the sprayer pipe and to establish the corresponding functional dependencies. The automatic adjustment system of the application rate was set to change the pressure when the green simulation surface hit 0.5 MPa, and the yellow surface hit 0.2 MPa. Sensor impact on a surface of different colours was simulated. At the same time, the pressure in the system changed. The pressure in the sprayer pipe of trailer sprayer OP-2000-2 was measured using a WIKAI EN837-1 pressure gauge and the readings were recorded with a Panasonic NV-GS75 digital video camera mounted on a Continent TRIPOD A2 stand. As a result of calculating the experimental data, it was found that the arithmetic mean of pressure reduction from 0.5 to 0.2 MPa is 1.94 s. And the arithmetic mean for four experiments, a pressure reduction of 0.05 MPa is 0.32 s. When calculating the experimental data of the pressure rise, it was found that the arithmetic mean of the pressure rise from 0.2 to 0.5 MPa is 2.37 s. And the average value for four experiments, the pressure rise by 0.05 MPa is 0.395 s. After approximation of experimental data obtained during single-factor experiments, when the pressure P and the corresponding time values t change, the corresponding polynomial functions describing the characteristic t=f(P) when operating a sprayer with automatic application rate control were obtained. The results obtained would allow calculating the time of delay or advance opening of the spray torch when working with variable standards for target plans, in order to avoid non-compliance with the application rate with the specified values