Performance and radial distribution profiles of a variable flow rate sprinkler developed for precision irrigation
Variable rate sprinklers (VRS) have been developed to promote localized water application of irrigated areas. In Precision Irrigation, VRS permits better control of flow adjustment and, at the same time, provides satisfactory radial distribution profiles for various pressures and flow rates are real...
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Universidade de São Paulo
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doaj-ed0645b6f7f44d568d6fa08712ba6f322020-11-25T00:14:25ZengUniversidade de São PauloScientia Agricola0103-90161678-992X2012-04-0169216016710.1590/S0103-90162012000200012Performance and radial distribution profiles of a variable flow rate sprinkler developed for precision irrigationRobson André ArmindoTarlei Arriel BotrelVariable rate sprinklers (VRS) have been developed to promote localized water application of irrigated areas. In Precision Irrigation, VRS permits better control of flow adjustment and, at the same time, provides satisfactory radial distribution profiles for various pressures and flow rates are really necessary. The objective of this work was to evaluate the performance and radial distribution profiles of a developed VRS which varies the nozzle cross sectional area by moving a pin in or out using a stepper motor. Field tests were performed under different conditions of service pressure, rotation angles imposed on the pin and flow rate which resulted in maximal water throw radiuses ranging from 7.30 to 10.38 m. In the experiments in which the service pressure remained constant, the maximal throw radius varied from 7.96 to 8.91 m. Averages were used of repetitions performed under conditions without wind or with winds less than 1.3 m s-1. The VRS with the four stream deflector resulted in greater water application throw radius compared to the six stream deflector. However, the six stream deflector had greater precipitation intensities, as well as better distribution. Thus, selection of the deflector to be utilized should be based on project requirements, respecting the difference in the obtained results. With a small opening of the nozzle, the VRS produced small water droplets that visually presented applicability for foliar chemigation. Regarding the comparison between the estimated and observed flow rates, the stepper motor produced excellent results.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000200012scheduling irrigationcentral pivotlinear irrigation systemautomation |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Robson André Armindo Tarlei Arriel Botrel |
spellingShingle |
Robson André Armindo Tarlei Arriel Botrel Performance and radial distribution profiles of a variable flow rate sprinkler developed for precision irrigation Scientia Agricola scheduling irrigation central pivot linear irrigation system automation |
author_facet |
Robson André Armindo Tarlei Arriel Botrel |
author_sort |
Robson André Armindo |
title |
Performance and radial distribution profiles of a variable flow rate sprinkler developed for precision irrigation |
title_short |
Performance and radial distribution profiles of a variable flow rate sprinkler developed for precision irrigation |
title_full |
Performance and radial distribution profiles of a variable flow rate sprinkler developed for precision irrigation |
title_fullStr |
Performance and radial distribution profiles of a variable flow rate sprinkler developed for precision irrigation |
title_full_unstemmed |
Performance and radial distribution profiles of a variable flow rate sprinkler developed for precision irrigation |
title_sort |
performance and radial distribution profiles of a variable flow rate sprinkler developed for precision irrigation |
publisher |
Universidade de São Paulo |
series |
Scientia Agricola |
issn |
0103-9016 1678-992X |
publishDate |
2012-04-01 |
description |
Variable rate sprinklers (VRS) have been developed to promote localized water application of irrigated areas. In Precision Irrigation, VRS permits better control of flow adjustment and, at the same time, provides satisfactory radial distribution profiles for various pressures and flow rates are really necessary. The objective of this work was to evaluate the performance and radial distribution profiles of a developed VRS which varies the nozzle cross sectional area by moving a pin in or out using a stepper motor. Field tests were performed under different conditions of service pressure, rotation angles imposed on the pin and flow rate which resulted in maximal water throw radiuses ranging from 7.30 to 10.38 m. In the experiments in which the service pressure remained constant, the maximal throw radius varied from 7.96 to 8.91 m. Averages were used of repetitions performed under conditions without wind or with winds less than 1.3 m s-1. The VRS with the four stream deflector resulted in greater water application throw radius compared to the six stream deflector. However, the six stream deflector had greater precipitation intensities, as well as better distribution. Thus, selection of the deflector to be utilized should be based on project requirements, respecting the difference in the obtained results. With a small opening of the nozzle, the VRS produced small water droplets that visually presented applicability for foliar chemigation. Regarding the comparison between the estimated and observed flow rates, the stepper motor produced excellent results. |
topic |
scheduling irrigation central pivot linear irrigation system automation |
url |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000200012 |
work_keys_str_mv |
AT robsonandrearmindo performanceandradialdistributionprofilesofavariableflowratesprinklerdevelopedforprecisionirrigation AT tarleiarrielbotrel performanceandradialdistributionprofilesofavariableflowratesprinklerdevelopedforprecisionirrigation |
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