Study of Flow Characteristics of Jets in Crossflow

Abstract

Many crossflow, mixing and

industrial

JICF, also reaction.

combustion devices rely on jets in known as transverse jets, to achieve Gas turbine combustors, and industrial

boilers, for example use gas-phase transverse jets for injection II of fuel and pollution control agents.

I The goal of this study is to develop a new experimental technique able to introduce a complete analysis for a JICF, and I other similar subjects. The idea of this technique is based on a combined computational-experimental study. I The computational portion of the study is a developed two­ lj dimensional model, CAST, to obtain a relation between velocity and concentration distributions. Consequently ensure that I' tracing jet trajectory either based on the velocity or concentration distributions is the same for the current case I studies. In addition, a three-dimensional model to draw horizontal cross sections for a JICF has been modified, by li estimating entrainment fraction at each cross section, instead of considering it as a constant value. Furthermore, the present II study aims to obtain general correlations to trace jet centerline, and to estimate entrainment fraction. A special code called FLUIDLAB package, has been designed and developed to digitize and analyze the experimental outputs, this code can be II , I considered as a corner stone in the introduced technique. J

The experimental portion introduces image digitizing technique, which has been developed to study JICF in both near­ and far-field at the same time, and to obtain mean-flow measurements. Paraffin smoke is blowed into the jet and used as IJ a marker of jet fluid, the result is the concentration of the

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