Particle diagnostics and turbulence measurements in a confined isothermal liquid sprayAn experimental study of the behavior and structure of a liquid spray immersed in a strong swirling field is reported. In order to simulate some of the aerodynamic conditions experienced by a spray in a model combustor, an experimental setup using an acrylic chamber, a vane-type swirler, and separate air supplies for both the secondary air and swirl air were integrated to perform the experiments in the wind tunnel. The effect of the swirling flow on the original spray cone is to widen it substantially, and to provide a vortex core where intense mixing results in large changes in particle size distribution and in particle number density. Outside the recirculation region, both the D32 and N sub d attain more uniform values. Inside the recirculation region, the mean axial velocity averaged over all the drop sizes has larger values than the mean air velocity. Outside the recirculation region, both the particles and the air exhibit virtually the same velocities. The turbulence measurements showed regions of high turbulence intensity in the boundaries of the recirculation region.
Document ID
19930035352
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Brena De La Rosa, A. (NASA Ames Research Center Moffett Field, CA, United States)
Sankar, S. V. (NASA Ames Research Center Moffett Field, CA, United States)
Wang, G. (NASA Ames Research Center Moffett Field, CA, United States)
Bachalo, W. D. (Aerometrics, Inc. Sunnyvale, CA, United States)
Date Acquired
August 15, 2013
Publication Date
June 1, 1992
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
ASME PAPER 92-GT-113
Meeting Information
Meeting: ASME, International Gas Turbine and Aeroengine Congress and Exposition