The Near Field in the Mixing of a Three-Dimensional Inclined Pollutant Jet With a Crossflow

Abstract

An experimental investigation was carried out to study the structure of the flow field resulting from the interaction of an inclined pollutant jet with a crossflow. The study of the flow field was conducted in a wind tunnel test by means of particle image velocimetry (PIV) system. As the jet was discharged with a variable angle, the resulting flow has been found to be quite complex owing to its three-dimensional nature and the interaction between several flow regions. Results showed the dependence of the emerging jet flow structure on its ratio velocity and the Reynolds number. Extensive wind tunnel experimental results are presented; they concern the Kelvin-Helmholtz vortical structures and the effect of the velocity ratio v0/u∞ on the interacting zone. A three-dimensional numerical model with a second-order turbulent model (RSM) and a nonuniform grid system is used to examine the behavior of the emerging jet. The comparison of the numerical and experimental results gives satisfactory agreement.

Numerical Investigation of the Flow and Infrared Radiation Characteristics of Nozzles with Transverse Jets of Different Shapes

“…Jet mixing enhancement methods can be classified in two major categories: passive flow control and active flow control technologies. The passive flow control methods include solid tab, lobe nozzle, and chevron nozzle [5][6][7][8][9][10][11]. These techniques can effectively alter the primary jet shear layers, but the performance of the engine exhaust system will decrease with these off-design conditions.…”