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Vortex generation using fin-slot structures and a submerged nozzle at a wall-injected cylinder

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Abstract

The internal flows of solid rocket motors are not yet fully understood. Several cold-air flow experiments that simulated combustion gas flow with compressed gas wall injections have been conducted to observe the behavior of internal flows and acoustic phenomena. Direct visualization, however, has rarely been performed due to the non-transparency of the wall-injecting media. In this study, novel techniques were employed to visualize the internal flow of the cold-flow model of a solid rocket motor. The smoke, which was generated using a heated Ni–Cr wire, was used as a flow tracer, and a light penetrated through an acrylic nozzle. The head-end of the test model was made with a transparent acrylic window to record the visualized flow using a high-speed CCD camera. The results of the visualization at the nozzle entrance region showed the symmetric vortex tube structures and the transient behavior of the circumferential flow. The vortex tube generation mechanism was explained with reference to the inlet vortex phenomenon of an aircraft engine. Also, it was observed that the interaction between the adjacent vortex tubes created the circumferential flow.

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Acknowledgments

Funding by the Agency for Defense Development, under Grant number ADD-09-01-05-11, is gratefully acknowledged.

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Authors and Affiliations

  1. Department of Aerospace and Mechanical Engineering, Graduate School of Korea Aerospace University, Goyang, Republic of Korea

    Dohun Kim & Inchul Lee

  2. School of Aerospace and Mechanical Engineering, Korea Aerospace University, 100 Hanggongdae-gil, Hwajeon-dong, Deogyang-gu, Goyang-si, Gyeonggi-do, Republic of Korea

    Jaye Koo

  3. Advanced Propulsion Technology Center, The 4th R&D Institute, Agency for Defense Development, Daejeon, Republic of Korea

    Hongbeen Chang & Moonjung Kang

Authors
  1. Dohun Kim
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  2. Inchul Lee
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  3. Jaye Koo
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  4. Hongbeen Chang
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  5. Moonjung Kang
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Corresponding author

Correspondence to Jaye Koo.

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Kim, D., Lee, I., Koo, J. et al. Vortex generation using fin-slot structures and a submerged nozzle at a wall-injected cylinder. J Vis 17, 41–47 (2014). https://doi.org/10.1007/s12650-013-0187-9

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  • DOI: https://doi.org/10.1007/s12650-013-0187-9

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