Two-phase flow measurements of a spray in a turbulent flowThe dynamics of spray drop interaction with a turbulent coflowing air stream were investigated using a Phase Doppler Particle Analyzer that determines both drop size and velocity. Detailed measurements obtained included spray drop size, axial and radial velocity, angle of trajectory, drop Reynolds number, and size-velocity correlations. The gas-phase flow field was also ascertained via the behavior of the smallest drops. Also investigated were the drag coefficients of droplets in a turbulent air cross flow for both monodispersions and polydispersions. Most notable aspects of the coflow included the effect of air streams with velocities significantly different from the spray sheet. Local changes in number density were produced as a result of lateral convection and streamwise accelerations and decelerations of various drop size classes. The complexity of the spray field interaction illustrated by this data effectively describes the development of the spray due to the influence of the airflow. The droplet drag measurements showed similar behavior for monodispersed and polydispersed flows and similar trends to previously obtained data. The measurements also pointed out further studies which would assist in creating an improved drag law for polydispersed drops in a turbulent environment.
Document ID
19870035114
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Rudoff, R. C. (Aerometrics, Inc. Mountain View, CA, United States)
Houser, M. J. (Aerometrics, Inc. Mountain View, CA, United States)
Bachalo, W. D. (Aerometrics, Inc. Mountain View, CA, United States)