Crossflow Mixing of Noncircular JetsAn experimental investigation has been conducted of the isothermal mixing of a turbulent jet injected perpendicular to a uniform crossflow through several different types of sharp-edged orifices. Jet penetration and mixing was studied using planar Mie scattering to measure time-averaged mixture fraction distributions of circular, square, elliptical, and rectangular orifices of equal geometric area injected into a constant velocity crossflow. Hot-wire anemometry was also used to measure streamwise turbulence intensity distributions at several downstream planes. Mixing effectiveness was determined using (1) a spatial unmixedness parameter based on the variance of the mean jet concentration distributions and (2) by direct comparison of the planar distributions of concentration and of turbulence intensity. No significant difference in mixing performance was observed for the six configurations based on comparison of the mean properties.
Document ID
19950017970
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Liscinsky, D. S. (United Technologies Corp. East Hartford, CT., United States)
True, B. (United Technologies Corp. East Hartford, CT., United States)
Holdeman, J. D. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 6, 2013
Publication Date
February 1, 1995
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
AIAA PAPER 95-0732NASA-TM-106865NAS 1.15:106865E-9477