Performance do microaspersor NAAN 7110 em condições de campo e laboratório.

Abstract

The accomplishment of perfomance tests in new and/or equipment has to be a constant and undelayable work of professional involved in localized irrigation. The main purpose of equipments trials used in localized irrigation system consiste of ordering its hydraulics chacacteristics and its performance analysis. In order to provide subsidies to the proper measurement of microsprinkling irrigation plan, it was developed a search in laboratory and fieldwork circumstances, in area belonged to Laboratorio de Engenharia de Irrigacao e Drenagem da Universidade Federal da Paraiba, in order to appraise the perfomance of NAAN 7110 microsprinkler. in fieldwork, it was worked with the air speed in the strips 0-2, 2-4, 4 - 6 and 6-8 km/h The aim of the tests is to determine the following parameters: Coefficient of Fabrication Variation, equation which determines the rate pression-flow, the real average wetted diameter in laboratory and fieldwork, uniformity of water distribution in laboratory and fieldwork, efficienty of water application in laboratory and fieldwork The microsprinkler pattern appraised has an excelent manufacture uniformity, with a Coefficient of Fabrication Variation Uniformity (CVF) equal to 0,0049. The model that chacacterized the microsprinkler NAAN 7110 rate pression-flow was the potencial kind which equation was (Q = 2,4854 * h °-5235) with 0,99 determination coefficient; In the conditions that the tests were fulfilled, there were no difference between the average wetted diameter, in laboratory (5,7 m) and fieldwork (5,7 m). The real wetted diameter, however, was bigger in fieldwork (5,7 m) than in laboratory (4,5 m). The Coefficient of Uniformity gained seemed low, 32,8 for laboratory and 36,8 and 38,5 for fieldwork, respectively. There were no wind influence in the coefficient of distribution in the studied conditions. The wind velocity and evaporation infuenced in water appication efficiency peremitter. The higher efficiency value found 92% was to range of wind velocity of 0 - 2 km/h and the lower was 37% to wind velocity to range of 6 - 8 km/h.