Modellierung des Spritzfächers einer Pflanzenschutzdüse mit der Diskrete-Elemente-Methode
DOI:
https://doi.org/10.15150/lt.2023.3289Abstract
Die Prüfverfahren von Applikationstechnik für Pflanzenschutzmittel sind aufgrund der meist erforderlichen Praxisversuche sehr aufwendig. Aus diesem Grund ist der Einsatz von Simulationsmethoden wünschenswert. Ein Gesamtmodell zur Abbildung einer Pflanzenschutzdüse und des zugehörigen Spritzfächers konnte bisher nicht entwickelt werden. Jedoch existieren für einzelne Teilprozesse zur Simulation der Abdrift in der CFD (Computational Fluid Dynamics) bereits Modelle, die aber oft nicht vollständig validiert sind. Für ein Gesamtmodell eignet sich die Diskrete-Elemente-Methode (DEM) u. a. aufgrund der Analogie zwischen Tropfen und den simulierten Partikeln sowie der einfachen Kontakterkennung bei der Benetzung. Die Abbildung des Sprühkegels mit der DEM stellt die erste Herausforderung dar, ein Ansatz hierfür wird im vorliegenden Beitrag vorgestellt. Auf Messdaten basierend wird in der Simulation ein Tropfenspektrum 100 mm unterhalb der Düse erzeugt und zur Validierung das Spektrum sowie die Querverteilung 500 mm unterhalb der Düse gemessen. Das Tropfenspektrum zeigt eine hohe Übereinstimmung, während bei der Querverteilung leichte Abweichungen zur Messung vorliegen.
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