Simulação da uniformidade de aplicação de água de um aspersor do tipo canhão hidráulico em diferentes condições de operação

Abstract

The proper handling of equipment and correct sizing are some of the ways to promote more efficient conditions in the uniformity of water application of an irrigation system. The uniformity of water distribution from hose-drawn system depends on several factors, such as: pairs of nozzle diameter and sprinkler operating pressure; spacing between carriers; rotation sector anlge of the sprinkler. This work was determined operational strategies for operating of the Komet Twin 202 Pro sprinkler in hose-drawn irrigation systems, through simulations of water application uniformity. The tests were conducted in a laboratory located in the Irrigation Laboratory of the Department of Engineering (DEG) on Federal University of Lavras, Lavras-MG. The distribution patterns of fifteen differents pairs of nozzle diameter (30, 35 and 37.5 mm) and operating pressure (294, 343, 392, 441 and 490 kPa) were determined. These were dimensionless and submitted to K-means clustering analysis, which identified two typical shapes to represent them. The water application uniformity simulations were grouped according to the two typical shapes (I and II). The results indicated that the spacing between towpath and the rotation sector angle of the sprinkler, which provide uniformities above 80%, depend on the distribution patterns. Further, for suitable combinations of nozzle diameter and operating pressure the distribution patterns tends to the D Christiansen's geometric shape (elliptical). In the two shapes rotation sector angles between 180 and 240 or 330 and 360° generate uniformity coefficient values greater than 270°.