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The effect of closed-loop feedback control on scalar mixing in a plane shear layer

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Abstract

The effect of feedback on mixing in a plane shear layer was studied using temperature as an analog to species concentration. Mixing was quantified using temperature measurements made by an array of cold-wire sensors. Upstream of the cold-wire sensors, a schlieren imager measured the cross-stream position of the temperature interface between the two streams before the primary vortical structures had formed. Surface heaters mounted on the flow partition were used as control actuators. Feeding the gained output from the interface position sensor back to the surface heaters closed the loop and created resonance and out-of-resonance conditions in the flow, both of which increased mixing. The feedback gains were adaptively modified in real time to maximize mixing at a given streamwise station. Finally, it was found that deliberately introducing streamwise vorticity, and then choosing feedback gains that strengthen these streamwise vortices, can greatly enhance mixing.

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Acknowledgments

The authors would like to acknowledge several useful discussions with Professor Arne Pearlstein.

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Authors and Affiliations

  1. FLIR Systems Inc., 27700 SW Parkway Ave., Wilsonville, OR, 97070, USA

    John M. Wiltse

  2. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA

    Ari Glezer

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  1. John M. Wiltse
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  2. Ari Glezer
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Correspondence to John M. Wiltse.

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Wiltse, J.M., Glezer, A. The effect of closed-loop feedback control on scalar mixing in a plane shear layer. Exp Fluids 51, 1291–1314 (2011). https://doi.org/10.1007/s00348-011-1139-6

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  • DOI: https://doi.org/10.1007/s00348-011-1139-6

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