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Investigation of micro-jet active control of a precessing jet using PIV

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Abstract

A circular jet entering an open-ended concentric circular chamber can rotate or precess about the jet axis for certain flow conditions and chamber configurations. Active flow control of a precessing jet provides the ability to influence the flow field inside the chamber and the resulting flow after the chamber exit. Twelve micro-jets surrounding the jet at the chamber inlet are used as actuation. At the chamber exit, four pressure probes and three-component velocity measurement using stereo particle image velocimetry (stereo-PIV) is used to monitor the flow. A phase plane method using signals from the pressure sensors is developed to monitor the location of the jet high-velocity region in real-time. Phase-locked stereo-PIV, triggered by the micro-jet actuation signal, is used to investigate the flow field and validate the pressure phase plane results. The effectiveness of the micro-jet actuation and the validation of the pressure phase plane measurements demonstrate actuation and the sensing needed for future closed-loop control of the precessing jet.

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of Alberta, Edmonton, AB, T6G 2G8, Canada

    Hamed Babazadeh, Charles Robert Koch & David S. Nobes

Authors
  1. Hamed Babazadeh
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  2. Charles Robert Koch
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  3. David S. Nobes
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Correspondence to Charles Robert Koch.

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Babazadeh, H., Koch, C.R. & Nobes, D.S. Investigation of micro-jet active control of a precessing jet using PIV. Exp Fluids 51, 1709–1719 (2011). https://doi.org/10.1007/s00348-011-1193-0

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  • DOI: https://doi.org/10.1007/s00348-011-1193-0

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