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On the unsteady dynamics of partially shrouded compressible jets

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Abstract

We experimentally investigate a partially shrouded sonic jet (a sonic free-jet shielded by a solid wall-extension on one side) exiting from a planar nozzle at two different nozzle pressure ratios (\(\zeta =4\) and 5). We experimentally show that the inherent jet unsteadiness from the shock-induced flow separation on the wall and the emitted noise in the far-field is strongly coupled through a series of experiments like high-speed schlieren, wall-static pressure, unsteady pressure spectra, and microphone measurements. The partially shrouded jet’s lateral free expansion is also identified to be complicated, three-dimensional, and the produced noise is directional. The emitted acoustic pulses from the flapping-jet, the radiated noise from the shock-induced separation on the wall, and the shock–shear layer interaction on the other side of the wall are responsible for the generated acoustic disturbances. The non-uniform aeroacoustic forcing on the top and bottom portion of the partially wall-bounded jet shear layer leads to a self-sustained jet oscillation and a discrete sound emission. The vital features are identified through the proper orthogonal decomposition of high-speed schlieren images and supplemented by other measurements.

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Data availability

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Acknowledgements

The financial support from the Department of Aerospace Engineering, Indian Institute of Technology, Kanpur-India, and DST-FIST, India, for carrying out the research work is gratefully acknowledged. The data that support the findings of this study are available from the corresponding author upon reasonable request. All authors have contributed equally to this work. The authors report no conflicts of interest.

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Authors and Affiliations

  1. Department of Aerospace Engineering, Indian Institute of Technology, Kanpur, 208016, India

    Soumya R. Nanda, T. V. Krishna, A. De & Mohammed S. Ibrahim

  2. Faculty of Aerospace Engineering, Technion-Israel Institute of Technology, Haifa, 3200003, Israel

    S. K. Karthick

Authors
  1. Soumya R. Nanda
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  2. S. K. Karthick
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  3. T. V. Krishna
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  4. A. De
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  5. Mohammed S. Ibrahim
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Contributions

SRN, SKK, TVK, AD, and IMS have contributed equally to this work.

Corresponding author

Correspondence to Mohammed S. Ibrahim.

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Nanda, S.R., Karthick, S.K., Krishna, T.V. et al. On the unsteady dynamics of partially shrouded compressible jets. Exp Fluids 62, 221 (2021). https://doi.org/10.1007/s00348-021-03318-0

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