Experimental Investigation of Velocity and Turbulence Variations in

Abstract

In this study, the changes of velocity and turbulence for an inclined jet in cross-flow are
investigated experimentally. Cylindrical and rectangular hole geometries are used in the
experiments. The blowing ratio is 1.75, and the injection angle with respect to the horizontal
plane is 30o. The injection holes in the models are in a single row. The diameters of holes,
which have a cylindrical cross section, are 8.5 mm. The rectangular cross section holes are 9
x 6.5 mm. The injection holes are inclined at 30o along the mainstream direction. The air is
injected at 57 oC and its blowing ratio is 1.75. The results show that turbulence intensity
changes with hole geometry. In this study, turbulence intensity is higher in the region close to
the wall because of the jet impact. The penetrations of the cylindrical jets into the main flow
are deeper than the penetrations of the rectangular jets, and turbulence intensities of the
cylindrical jets are larger than the penetrations of the rectangular jets.

Keywords

• Inclined Jets

References

1. Bayraktar S. and Yilmaz T., “The Investigation of Vortices by Using Second Order Turbulence Closure”, Journal of Aeronautics and Space Technologies, 3:7-15, (2007).