Turbulence control in wall jets |
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| Affiliation: | 1. Laboratory of Vibrational Hydromechanics, Perm State Humanitarian Pedagogical University, 614990 Perm, Russia;2. Laboratory of Hydrodynamic Stability, Institute of Continuous Media Mechanics of the Ural Branch of Russian Academy of Sciences, 614013, Perm, Russia;1. Institute of Mathematics, Heinrich-Heine-University Düsseldorf, Düsseldorf, Germany;2. Computer, Electrical, Mathematical Sciences & Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia;1. Aeronautics Institute of Technology – IEFM/ITA, 12228-900 São José dos Campos, SP, Brazil;2. National Institute for Space Research – DGE/INPE and World Institute for Space Environment Research – WISER, P.O. Box 515, 12227-010 São José dos Campos, SP, Brazil |
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| Abstract: | ![]()
A new method for the control of mixing of a plane turbulent wall jet has been investigated. A thin wire, mounted in the vicinity of the wall-jet nozzle, changes the formation of the shear-layer structures in the early stages of the development of the wall jet. The wire is operated in two ways: (1) a still wire inhibits the natural shear layer roll-up and reduces the size of the turbulent structures and thereby the mixing; (2) a self-excited oscillating wire introduces large coherent structures and thereby enhances the mixing. The size of these structures does not depend on the shear-layer instability but rather on the wire frequency.Measurements of the mean and fluctuating velocities have been performed with hot-wire anemometry as well as measurements of the skin friction by means of Preston tubes, surface fences and wall hot-wires. The Reynolds number based on the slot width was Rej=10000. |
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