Abstract
Large eddy simulations of rectangular jets in crossflow are performed to study the effect of hole geometry on the penetration and spread of the coolant jet. Three different holes of aspect ratio 0.5, 1.0 and 2.0 are studied. In the present study, the jet to crossflow blowing ratio is 0.5 and the jet Reynolds number is approximately 4,700.
It is observed that the dynamics of jets in crossflow are influenced significantly by the hole geometry for low jet to mainstream velocity ratios near the hole exit. The vertical penetration is greatest for the aspect ratio 2.0 and least for the aspect ratio 0.5. Dynamics of various steady as well as unsteady flow structures for different holes is markedly distinct at this Reynolds number. The separation between the leading and trailing edges of holes controls the evolution of the counter rotating vortex pair (CVP) near the jet exit. The relative strength of horseshoe vortex as compared to CVP changes with the hole geometry.
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Tyagi, M., Acharya, S. (1999). Large Eddy Simulations of Rectangular Jets in Crossflow: Effect of Hole Aspect Ratio. In: Knight, D., Sakell, L. (eds) Recent Advances in DNS and LES. Fluid Mechanics and its Applications, vol 54. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4513-8_37
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DOI: https://doi.org/10.1007/978-94-011-4513-8_37
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