Vaporization Rates and Drag Coefficients for Isooctane Sprays in Turbulent Air Streams

Abstract

Report presenting the use of a droplet camera developed at the NACA Lewis laboratory to obtain drop-size distribution and drop-velocity data for isooctane injected from a simple orifice directly into a turbulent air stream. Vaporization and drag coefficients were calculated for isooctane drops accelerating and evaporating in streams with velocities of 140 and 180 feet per second. Results regarding the vaporization-rate equations, drop-size-distribution analyses, analysis of drop-velocity data, and fuel-spray-evaporation calculations are provided.