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Full-field measurements of self-excited oscillations in momentum-dominated helium jets

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Abstract

Flow structure of momentum-dominated helium jets discharged vertically into ambient air was investigated using a high-speed rainbow schlieren deflectometry (RSD) apparatus operated at up to 2,000 Hz. The operating parameters, i.e., Reynolds number and Richardson number were varied independently to examine the self-excited, flow oscillatory behavior over a range of experimental conditions. Measurements revealed highly periodic oscillations in the laminar region at a unique frequency as well as high regularity in the flow transition and initial turbulent regions. The buoyancy was shown to affect the oscillation frequency and the distance from the jet exit to the flow transition plane. Instantaneous helium concentration contours across the field of view revealed changes in the jet flow structure and the evolution of the vortical structures during an oscillation cycle. A cross-correlation technique was applied to track the vortices and to find their convection velocity. Time traces of helium concentration at different axial locations provided detailed information about the oscillating flow.

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Acknowledgements

This work was supported by the Physical Sciences Division of NASA’s Office of Biological and Physical research under grant NAG 3–2388.

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Authors and Affiliations

  1. School of Aerospace and Mechanical Engineering, University of Oklahoma, Room 208, 865 Asp Avenue, Norman, OK, 73019, USA

    B. S. Yildirim

  2. Department of Mechanical Engineering, University of Alabama, 290 Hardaway Hall, Tuscaloosa, AL, 35487, USA

    A. K. Agrawal

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  1. B. S. Yildirim
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  2. A. K. Agrawal
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Correspondence to A. K. Agrawal.

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Yildirim, B.S., Agrawal, A.K. Full-field measurements of self-excited oscillations in momentum-dominated helium jets. Exp Fluids 38, 161–173 (2005). https://doi.org/10.1007/s00348-004-0878-z

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  • DOI: https://doi.org/10.1007/s00348-004-0878-z

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