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Quantitative visualization of the three-dimensional flow structures of a sweeping jet

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Abstract

The flow characteristics of a sweeping jet ejecting from a typical feedback channel fluidic oscillator were investigated using time-resolved particle image velocimetry. The three-dimensional flow structure of the jet was examined through the instantaneous and averaged velocity fields measured at the streamwise center plane and cross-sectional planes of the jet for a range of Reynolds numbers (8000, 12,000, 16,000, 20,000, and 24,000). As the Reynolds number increases, the frequency of the sweeping jet linearly increases from 0.7 to 2 Hz. However, the switching time of the jet flow direction from one side to the other is very short compared to the sweeping period. As a result, the ensemble-averaged flow patterns of the sweeping jet at the streamwise center plane look like twin jets issued from a V-shaped nozzle, regardless of the Reynolds number. The rapidly switching jet contains a counter-rotating vortex at the cross-sectional plane of the jet near the nozzle, similar to a cross-flow jet. The coherent vortex structures are rapidly destroyed and become random when the jet moves downstream.

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Acknowledgements

This research was partially supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF), which is funded by the Ministry of Education (NRF-2016R1D1A1B03935729).

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Authors and Affiliations

  1. School of Mechanical Engineering, Pusan National University, Busan, 46241, Republic of Korea

    Sang Hyouk Kim

  2. Product Performance and Technology Division, Ministry of SMEs and Startups, Busan, 46754, Republic of Korea

    Sang Hyouk Kim

  3. Rolls-Royce University Technology Center, Pusan National University, Busan, 46241, Republic of Korea

    Hyun Dong Kim

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  1. Sang Hyouk Kim
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  2. Hyun Dong Kim
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Correspondence to Hyun Dong Kim.

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Kim, S.H., Kim, H.D. Quantitative visualization of the three-dimensional flow structures of a sweeping jet. J Vis 22, 437–447 (2019). https://doi.org/10.1007/s12650-018-00546-1

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