A COMPUTATIONAL STUDY ON SPRAY DISPERSAL IN THE WAKE OF AN AIRCRAFT

作者：Ryan S D^*; Gerber A G; Holloway A G L

来源：Transactions of the ASABE, 2013, 56(3): 847-868.

DOI：10.13031/trans.56.10022

• AGDISP
• Computational fluid dynamics
• Droplet dispersion
• Droplet size spectra
• Lagrangian tracking
• Modeling
• Multiphase flow
• Near wake
• Pesticide
• Rotary cage atomizers
• Small aircraft
• Spraying
• Spray plume
• Turbulent dispersion
• Wingtip vortices

This article describes a computational study using CFD models of droplet spray dispersal in the wake of a small aircraft up to 200 m downstream. The CFD Reynolds-averaged Navier-Stokes (RANS) models use a Lagrangian (droplet phase) and Eulerian (fluid phase) procedure to predict the droplet trajectories through the turbulent aircraft wake. The methods described have the potential to improve current low-order models for aerial spraying and help in the development of new spraying procedures. In addition, the CFD models will provide sophisticated input to atmospheric turbulence models, which are used to predict the transport of droplets from the near-field wake of the aircraft to the far-field spray target. In this study, CFD models are developed for the polydispersed sprays released from five Micronair AU4000 atomizers mounted on each wing of an Air Tractor AT-802. This atomizer and aircraft combination is commonly used in forest protection. A parametric study of the aircraft model examines the effects of crosswinds on the aircraft%26apos;s vortex structures and the resulting droplet trajectories. The study shows how crosswinds interact with the aircraft wake to maldistribute the droplet mass flux. A comparison of the present results to AGDISP predictions is provided

• 出版日期2013-6