INFLUENCE OF AIRCRAFT VORTICES ON SPRAY CLOUD BEHAVIOR

For small droplet spraying, the spray cloud is initially entrained int o the wingtip vortices so that the ultimate fate of the spray is contr olled by the motion of these vortices. In close to 100 aerial sprays, the emitted spray cloud has been mapped using a scanning laser system that displays diffusion and transport of the spray cloud. Results deta iling the concentrations within the spray cloud in space and time are given for sprays in parallel and crosswinds. Wind direction is seen to potentially alter the vortex motion and hence- the fate of the spray cloud. In crosswind spraying, the vortex behavior associated with the 2 wings is found to differ, which leads to enhanced deposition from th e upwind wing and enhanced drift from the downwind wing.