Electrostatic Spinner-Nozzle for Charging Aerial Sprays

Abstract

ABSTRACT AN electrostatic charging, spinner-nozzle for aircraft was designed, developed and evaluated to meet strin-gent operational requirements. The rotational speed of the spinner, and hence the spray-droplet size, can be varied by altering the spinner motor voltage. Spray-charging efficiency has been shown to increase as the spinner speed is increased. We obtained, with ease, a spray charge-to-mass ratio of 2 X 102 C/kg. In one ex-periment, we demonstrated that charged spray deposi-tion increased with an increase in spray charge-to-mass ratio. This experiment also showed that electrostatically charged spray deposition can exceed that of its uncharged counterpart by 800 percent. In another experiment, drift from charged spray was shown to be drastically reduced below that of uncharged spray.