Experimental Investigation of Velocity and Turbulence Variations in Inclined Jet in Cross-Flow

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.