Characterization and simulation of a low-pressure rotator spray plate sprinkler used in center pivot irrigation systems

Robles Rovelo, Cruz Octavio ; Zapata Ruiz, Nery (Universidad de Zaragoza) ; Burguete Tolosa, Javier ; Félix-Félix, Jesús Ramiro ; Latorre, Borja

Resumen: Spray sprinklers enable to operate at low pressures (<103 kPa) in self-propelled irrigation machines. A number of experiments were performed to characterize the water distribution pattern of an isolated rotator spray plate sprinkler operating at very low pressure under dierent experimental conditions. The experiments were performed under two pressures (69 kPa and 103 kPa) and in calm and windy conditions. The energy losses due to the impact of the out-going jet with the sprinkler plate were measured using an optical technique. The adequacy to reproduce the measured water distribution pattern under calm conditions of two drop size distribution models was evaluated. A ballistic model was used to simulate the water distribution pattern under wind conditions evaluating three different drag models: (1) considering solid spherical drops; (2) a conventional model based on wind velocity and direction distortion pattern, and (3) a new drag coeffcient model independent of wind speed. The energy losses measured with the optical method range from 20% to 60% from higher to lower nozzle sizes, respectively, for both evaluated working pressures analyzing over
16,500 droplets. For the drop size distribution selected, Weibull accurately reproduced the water application with a maximum root mean square error (RMSE) of 19%. Up to 28% of the RMSE could be decreased using the wind-independent drag coeffcient model with respect to the conventional model; the dierence with respect to the spherical model was 4%.

Idioma: Inglés

DOI: 10.3390/w11081684

Año: 2019

Publicado en: WATER 11 (2019), 1684 [20 pp.]
ISSN: 2073-4441

Factor impacto SCIMAGO: 0.108 - Water Science and Technology (Q2) - Biochemistry (Q3) - Fluid Flow and Transfer Processes (Q4)

Financiación: info:eu-repo/grantAgreement/ES/MICINN/AGL2013-48728-C2-1-R
Financiación: info:eu-repo/grantAgreement/ES/MICINN/AGL2017-89407-R

Tipo y forma: Artículo (Versión definitiva)

Área (Departamento): Área Administrativa (Dpto. CC.Agrar.y Medio Natural)