The effects of free stream air velocity on water droplet size and distribution for an impaction spray nozzle

Fog generation for ingestion by gas turbine engines is a method by which th e amount of work done during compression can be reduced by evaporative cool ing of the inlet air and can improve the engine's efficiency by as much as 15 per cent. Generating fog produces problems if the droplet size is too hi gh which can result in erosion and possibly corrosion damage to the compres sor and stator blades. This study examines the water droplet spray characte ristics of an impaction-type atomizer over a range of free stream air veloc ities, water pressures and fluid viscosities.