The aim of the research is to select the diameters of the nozzles of the deflector nozzles and to determine the quality indicators of the operation of a new wide-grip sprinkler of circular action, developed at the Federal State Budgetary Scientific Institution «RosNIIPM». The selection of the diameters of the nozzles of the deflector nozzles was carried out from the conditions of passing three different flows through the DM water pipeline: 15, 30 and 60 l/s. The scheme of their arrangement – rain-forming devices have different flow rates and diameters of nozzles at the same distance between them along the DM water-conducting pipeline. The analysis of the results obtained showed small deviations in the actual flow rate of the deflector nozzles through the water pipeline (cf. deflector nozzles with calculated nozzle diameters. Investigations of irrigation uniformity were carried out, as a result of which the following results were obtained: effective irrigation coefficient – 0.67–0.78; the coefficient of insufficient irrigation is 0.10–0.12, the coefficient of excessive irrigation is 0.12–0.15. At the same time, a decrease in the uniformity of irrigation is associated with an increase in wind speed and thereby an increase in the drift of artificial rain drops, the worst condition for the use of a WDM is a wind speed of more than 5 m/s, and therefore it is recommended to use this DM in the morning and evening, characterized by a more reduced wind load.

The aim of the research is to analyze the characteristics of experimental circular-type deflector nozzles installed as rain-forming devices on a new wide-grip circular sprinkler machine developed at the Federal State Budget Scientific Institution «RosNIIPM» obtained during laboratory field trials. In this case, circular-type baffle nozzles with nozzle diameters, mm, were used: 2, 4, 6, 8, 10, 12, 14. The maximum irrigation radius of a circulartype baffle nozzle (for various nozzle diameters) at a maximum pressure equal to 0.3 MPa lies in the range of 2.6–11.5 m. Processing of the experimental data made it possible to obtain the dependences of the irrigation radius of circular-type deflector nozzles on the head and nozzle diameter and average droplet diameter on nozzle and head flow rate, which will allow the selection of the necessary circular-type deflector nozzles at the installation height of 2.7 m Thus, the developed nozzles provide a uniform distribution of irrigation water over the irrigation area, and the average diameter of rain drops can be attributed to the fine-structured one, which ensures the fulfillment of agrotechnical requirements.

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