Atomization in a turbulent shear layer: Preliminary measurements
Abstract
The influence of mean air velocity and shear layer strength on airblast atomization is investigated. A flat prefilming airblast atomizer located along the centerline of a two-stream wind tunnel is used to generate the spray. The air velocities on either side of the atomizer can be varied independently to adjust the shear layer strength. Profiles of the mean and fluctuating components of velocity are obtained with a hot-film anemometer. These measurements show that the velocity profiles are two dimensional in the region of interest for atomization. Forward scattering is used to measure the Sauter mean diameter (SMD) of the spray. Measurements obtained for the case with a shear layer strength of zero show the SMD decreases with increases in air velocity and are consistent with other studies reported in the literature for prefilming atomizers. The results used to refine and select cases for detailed characterization of the relevant processes are reported, with particular attention to atomizing air turbulence and boundary layers. Relations between the turbulence and spray parameters and air-breathing engine performance are discussed.
- Publication:
-
In Johns Hopkins Univ
- Pub Date:
- October 1987
- Bibcode:
- 1987jann....2..119M
- Keywords:
-
- Atomizing;
- Combustion;
- Shear Flow;
- Spraying;
- Turbulent Flow;
- Flow Velocity;
- Gas Turbines;
- Hot-Film Anemometers;
- Wind Tunnels;
- Fluid Mechanics and Heat Transfer