Investigation of the Spray Pattern in the Air Flow Induced by Coaxial Rotors Used for Pesticide Spraying

Please enable javascript in your browser.

Soleymani Asl, Hamideh | 2023

47 Viewed

Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 56351 (45)
University: Sharif University of Technology
Department: Aerospace Engineering
Advisor(s): Morad, Mohammad Reza; Hejranfar, Kazem
Abstract:
The production of agricultural products is one of the most important human economic activities. The issue of mechanized and optimal use of pesticides is vital for human health and the environment, and the use of helicopters makes this possible. Although spray-based systems in helicopters are one of the most effective ways to produce agricultural products, it is still unclear how droplet movement in aerial spraying is affected by the complex downwash flow created by rotors. Modeling agricultural air spray to identify the spray trend of droplets in the air stream, downwash flows, and consequent vortices has attracted more attention as a result of the development of computational fluid dynamics. In the present study, numerical simulations were performed by using a commercial software to examine the structure of downwash flow, rotor wake, and vortices from single and coaxial rotors in hover flight. In addition, the Lagrangian discrete phase method was utilized to model the droplet spraying in the rotor wake flow. The results for the hovering regime were also compared and validated with the ones existing in the literature
Keywords:
Computer Simulation ; Downwash Flows ; Lagrangian Discrete Phase Model ; Droplet Spraying ; Computational Fluid Dynamics (CFD)

No TOC