Abstract
An experimental study was made of the influence of aspect ratio on turbulent free jet flows issuing from sharp-edged rectangular slots. Four slot aspect ratios (2, 5, 10, and 20) were used. The measured time-average quantities, acquired with hot-wire anemometry, are the mean streamwise velocity, turbulence kinetic energy, Reynolds shear stress, and some of the triple-velocity products. The results indicate that, for the slot aspect ratios considered, the speed of mixing in the very near flow field (ie, X/ D e ≤ 5) increases as the slot aspect ratio increases. Indeed, in the region X/ D e ≤ 5, the highest shear-layer values of the turbulence kinetic energy, the Reynolds shear stress and the turbulent transport of the Reynolds stresses are found in the aspect ratio 20 jet, which also has the shortest potential core length. The results also show that a simple eddy-viscosity type of turbulence model would fail to simulate the shear-stress distribution in all but the lowest aspect ratio jet flow and that the turbulent eddies in the jet shear layers are highly organized.
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