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- W2316220483 abstract "Contra-rotating vortex pairs in a turbulent boundary layer were studied in a wind tunnel model experiment. The boundary layer was developed on a flat-plate trailed by a 10’20’ deflection plate, leading to an adverse pressure gradient. The vortices were produced with contra-rotating round jets with nozzle exits flush with the plate surface. The skew angle and pitch angle of the nozzle were 45”. The jet diameter was 14mm and the thickness of the oncoming boundary layer was 28.6mm. The Reynolds number based on the momentum thickness of the oncoming boundary layer was 4367. A velocity field survey was performed with a three-element Laser doppler anemometry (LDA) system. The effects of jet speed and streamwise development of vortex were investigated. The flow had an ‘upwash’ region in between the vortices which were embedded in the turbulent boundary layer. The ‘upwash’ was produced by the vortices and the interaction between diametrically opposed secondary, near-wall flows. The interaction between the diametrically opposed near-wall flows leads to a ‘fountain-upwash’ effect. Compared with a baseline flat-plate flow, the peak vorticity experiences negligible change but the circulation drops substantially by more than 20%." @default.
- W2316220483 created "2016-06-24" @default.
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- W2316220483 date "1999-01-11" @default.
- W2316220483 modified "2023-09-25" @default.
- W2316220483 title "Measurements of contra-rotating vortices in a turbulent boundary layer" @default.
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- W2316220483 doi "https://doi.org/10.2514/6.1999-555" @default.
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